title:
Determining the ratio of the H^+ -> \tau \nu to H^+ -> t b-bar decay
  rates for large \tan\beta at the Large Hadron Collider

abstract:
  We present results on the determination of the observable ratio R=BR(H^+ ->
\tau \nu)/BR(H^+ -> t b-bar) of charged Higgs boson decay rates as a
discriminant quantity between Supersymmetric and non-Supersymmetric models.
Simulation of measurements of this quantity through the analysis of the charged
Higgs production process gb-> t b H^+ and relative backgrounds in the two above
decay channels has been performed in the context of ATLAS. A ~12-14% accuracy
on R can be achieved for \tan\beta=50, \mHc=300-500 GeV and after an integrated
luminosity of 300 fb^-1. With this precision measurement, the Large Hadron
Collider (LHC) can easily discriminate between models for the two above
scenarios, so long as \tan\beta > 20.


title: Negative Pressures and Energies in Magnetized and Casimir Vacua

abstract:
  We study the electron-positron vacuum in a strong magnetic field $B$ in
parallel with Casimir effect. Use is made of the energy-momentum tensor, taken
as the zero temperature and zero density limit of the relativistic quantum
statistical tensor. In both magnetic field and Casimir cases it is shown the
arising of anisotropic pressures. In the first case the pressure transversal to
the field $B$ is negative, whereas along $B$ an usual positive pressure arises.
Similarly, in addition to the usual negative Casimir pressure perpendicular to
the plates, the existence of a positive pressure along the plates is predicted.
The anisotropic pressures suggests a flow of the virtual particles in both
cases. By assuming regions of the universe having random orientation of the
lines of force, cosmological consequences are discussed in the magnetic field
case.


title: Bounds on New Physics from B -> V1 V2 Decays

abstract:
  We consider the possibility that physics beyond the standard model
contributes to the decays B -> V1 V2, where V1 and V2 are vector mesons. We
show that a time-dependent angular analysis of B -> V1 V2 decays provides many
tests for this new physics (NP). Furthermore, although one cannot solve for the
NP parameters, we show that this angular analysis allows one to put bounds on
these parameters. This can be useful in estimating the scale of NP, and can
tell us whether any NP found directly at future high-energy colliders can be
responsible for effects seen in B -> V1 V2 decays.


title: Electroweak Symmetry Breaking via UV Insensitive Anomaly Mediation

abstract:
  Anomaly mediation solves the supersymmetric flavor and CP problems. This is
because the superconformal anomaly dictates that supersymmetry breaking is
transmitted through nearly flavor-blind infrared physics that is highly
predictive and UV insensitive. Slepton mass squareds, however, are predicted to
be negative. This can be solved by adding D-terms for U(1)_Y and U(1)_{B-L}
while retaining the UV insensitivity. In this paper we consider electroweak
symmetry breaking via UV insensitive anomaly mediation in several models. For
the MSSM we find a stable vacuum when tanbeta < 1, but in this region the top
Yukawa coupling blows up only slightly above the supersymmetry breaking scale.
For the NMSSM, we find a stable electroweak breaking vacuum but with a chargino
that is too light. Replacing the cubic singlet term in the NMSSM superpotential
with a term linear in the singlet we find a stable vacuum and viable spectrum.
Most of the parameter region with correct vacua requires a large superpotential
coupling, precisely what is expected in the ``Fat Higgs'' model in which the
superpotential is generated dynamically. We have therefore found the first
viable UV complete, UV insensitive supersymmetry breaking model that solves the
flavor and CP problems automatically: the Fat Higgs model with UV insensitive
anomaly mediation. Moreover, the cosmological gravitino problem is naturally
solved, opening up the possibility of realistic thermal leptogenesis.


title:
Spin observables in the $NN\to Y\Theta^+$ reaction at the threshold and
  quantum numbers of the $\Theta^+$ pentaquark

abstract:
  General formulae for the spin-spin correlation parameters $C_{i,j}$ and
spin-transfer coefficients $K_i^j$ are derived for the reaction $N N\to Y
\Theta^+$ at the threshold for an arbitrary spin of the pentaquark $\Theta^+$.
It is shown that a measurement of the sign of $C_{y,y}$ or an observation of
the non-zero polarization transfer from the nucleon to the hyperon $Y$ allow
one to determine the P-parity of the $\Theta^+$ unambiguously and independently
on the spin of the $\Theta^+$.
  Measurement of these spin observables in the both $pp$- and $pn$- channels of
this reaction determines also the isospin of the $\Theta^+$.


title: Flavor Neutrinos States

abstract:
  It is shown that a flavor neutrino state that describes a neutrino produced
or detected in a charged-current weak interaction process depends on the
process under consideration and is appropriate for the description of neutrino
oscillations as well as for the calculation of neutrino production or detection
rates. Hence, we have a consistent framework for the description of neutrino
oscillations and interactions.


title: Effective K-factors for gg -> H -> WW -> lnu lnu at the LHC

abstract:
  A simulation of the search for the Standard Model Higgs boson at the LHC, in
the channel gg -> H -> WW -> lnu lnu, is described. Higher-order QCD
corrections are taken into account by using a reweighting procedure, which
allows us to combine event rates obtained with the PYTHIA Monte Carlo program
with the most up-to-date theoretical predictions for the transverse-momentum
spectra of the Higgs signal and its corresponding WW background. With this
method the discovery potential for Higgs masses between 140 and 180 GeV is
recalculated and the potential statistical significance of this channel is
found to increase considerably. For a Higgs mass of 165 GeV a
signal-to-background ratio of almost 2:1 can be obtained. A statistical
significance of five standard deviations might already be achieved with an
integrated luminosity close to 0.4 fb^{-1}. Using this approach, an
experimental effective K-factor of about 2.04 is obtained for the considered
Higgs signature, which is only about 15 % smaller than the theoretical
inclusive K-factor.


title: J/\Psi Production in pp Collisions at \sqrt s = 200 GeV at RHIC

abstract:
  We study J/\psi production in pp collisions at RHIC within the PHENIX
detector acceptance range using the color singlet and color octet mechanism
which are based on pQCD and NRQCD. Here we show that the color octet mechanism
reproduces the RHIC data for J/\psi production in pp collisions with respect to
the p_T distribution, the rapidity distribution and the total cross section at
\sqrt s = 200 GeV. The color singlet mechanism leads to a relatively small
contribution to the total cross section when compared to the octet
contribution.


title: Possible Evidence For Axino Dark Matter In The Galactic Bulge

abstract:
  Recently, the SPI spectrometer on the INTEGRAL satellite observed strong 511
keV line emission from the galactic bulge. Although the angular distribution
(spherically symmetric with width of \sim 9 degree) of this emission is
difficult to account for with traditional astrophysical scenarios, light dark
matter particles could account for the observation. In this letter, we consider
the possibility that decaying axinos in an R-parity violating model of
supersymmetry may be the source of this emission. We find that \sim 1-300 MeV
axinos with R-parity violating couplings can naturally produce the observed
emission.


title:
Radiative Corrections to the Azimuthal Asymmetry in Transversely
  Polarized Moller Scattering

abstract:
  Experiment E158 at SLAC can measure an azimuthal asymmetry in single-spin,
transversely polarized Moller scattering, e^{-\uparrow} e^- -> e^- e^-, which
arises from a QED rescattering phase. We recompute the leading-order (one-loop)
asymmetry, confirming previous results, and calculate the leading logarithmic
QED corrections due to initial-state radiation from the beam and target
electrons, and due to final-state radiation. The size of these radiative
corrections is quite sensitive to experimental details, such as the acceptance
in energy and in polar angle of the scattered electron. For E158, the
corrections are modest, increasing the parts-per-million asymmetry by roughly 1
percent.


title: Unitarity in Higher Dimensions and Gauge Unification

abstract:
  Unitarity of the 4d standard model is ensured by the conventional Higgs
mechanism with a fundamental spin-0 Higgs boson, responsible for gauge boson
mass-generations. On the contrary Kaluza-Klein (KK) compactification of extra
spatial dimensions can geometrically realize the gauge boson mass generation
without invoking a fundamental Higgs scalar. We reveal that massive gauge boson
scattering in the compactified theories is unitary at low energies, and the
unitarity violation is {\it delayed} to the intrinsic ultraviolet (UV) scale of
the higher dimensional gauge theory. We demonstrate that this is a generic
consequence of the ``geometric Higgs mechanism'' (GHM), manifested via
Kaluza-Klein equivalence theorem (KK-ET). We further show that the presence of
many gauge KK states below the UV cutoff scale imposes strong bounds on the
highest KK level (N_KK). Applying these bounds to higher-dimensional SUSY GUTs
implies that only a small number of KK states can be used to accelerate gauge
coupling unification, and suggests that the GUT scale in the 5d minimal SUSY
SU(5) is above 10^{14} GeV.


title: Brane Q-ball, branonium and brane Q-ball inflation

abstract:
  We study the stability of branonium. Contrary to the previous arguments,
global structure of branonium is not stable against spatial fluctuations. We
show that branonium decays into local objects, which looks like Q-balls in the
effective action. Therefore, we consider the idea of brane Q-balls in this
paper. Brane Q-balls are produced as the remnants of unstable branonium.
Although the brane Q-balls are conceptually different from the conventional
Q-balls, they look similar in some parametric regions. We show how to
distinguish brane Q-balls from conventional Q-balls.


title: E6 Unification, Large Neutrino Mixings, and SUSY Flavor Problem

abstract:
  This study indicates that in E6 grand unified theories (GUTs), once a
hierarchical structure of up-quark-type Yukawa couplings is given as a basic
structure of flavor, larger lepton mixings than the quark mixings and milder
down-quark-type (and charged-lepton-type) mass hierarchies than up-quark-type
mass hierarchy can generically be obtained under a few natural assumptions. The
basic flavor structure is compatible with non-Abelian horizontal symmetry,
which can solve the SUSY flavor problem. It is shown that in solving the SUSY
flavor problem, the E6 structure, which realizes bi-large neutrino mixings,
also solves a problem that results from the large neutrino mixing angles.


title: Flavor violation and extra dimensions

abstract:
  We analyze new sources of flavor violation in models with extra dimensions.
We focus on three major classes of five dimensional models: models with
universal extra dimension, models with split fermions, and models with warped
extra dimension.We study the implications of these new sources on the associate
CP violating asymmetries to the rare B-decays. We show that among these models
only the split fermions scenario may accommodate the recent experimental
deviation between the CP asymmetry of B_d -> phi K_S and sin 2 beta.


title: Testing Supersymmetry in $A H^\pm$ Associated Production

abstract:
  In the Minimal Supersymmetric Standard Model, the masses of the charged Higgs
boson ($H^\pm$) and the CP-odd scalar ($A$) are related by
$M_{H^+}^2=M_A^2+m_W^2$ at the Born level. Because the coupling of
$W^-$-$A$-$H^+$ is fixed by gauge interaction, the Born level production rate
of $q \bar q' \to W^{\pm \ast} \to A H^\pm$ depends only on one supersymmetry
parameter -- the mass ($M_A^{}$) of $A$. We illustrate how to test the mass
relation between $A$ and $H^+$ in case that the signal is found at the LHC. If
the signal is not found, the product of the decay branching ratios of $A$ and
$H^\pm$ predicted by the MSSM is bounded from above as a function of $M_A$.


title:
Measuring psi(3770) -> Kshort Klong as a test of the S- and D-wave
  mixing of charmonia

abstract:
  Adding to the long standing "rho-pi puzzle" in psi(3686) and J/psi decays,
recently BES reported the branching ratio of psi(3686) -> Kshort Klong which is
enhanced relative to the pQCD " 12% rule" expectation from the branching ratio
of J/psi -> Kshort Klong. If the enhancement is due to the mixing of the S- and
D-wave charmonium states as in the rho-pi case, the newly measured branching
ratio of psi(3686) -> Kshort Klong gives a constraint on the psi(3770) ->
Kshort Klong. It serves as a good test for the scenario of the S- and D-wave
mixing in the psi(3686) and psi(3770).


title:
Classification of SUSY and non-SUSY Chiral Models from Abelian Orbifolds
  AdS/CFT

abstract:
  We classify compactifications of the type IIB superstring on AdS_{5} x
S^{5}/\Gamma, where \Gamma is an abelian group of order n<= 12. Appropriate
embedding of \Gamma in the isometry of S^5 yields both SUSY and non-SUSY chiral
models that can contain the minimal SUSY standard model or the standard model.
New non-SUSY three family models with \Gamma=Z_8 are introduced, which lead to
the right Weinberg angle for TeV trinification.


title: Sleptons at post-WMAP benchmark points at LHC(CMS)

abstract:
  We study a possibility to detect sleptons at post-WMAP benchmark points at
LHC(CMS). We find that at $L_{tot}=30 fb^{-1}$ it would be possible to detect
sleptons at points A, B, C, D, G. We also investigate the production and decays
of right and left sleptons separately. We find that at $L_{tot}=30 fb^{-1}$ it
would be possible to detect right sleptons with a mass up to 200 GeV and left
ones with a mass up to 300 GeV.


title: Scalar charmonium and glueball mixing in $e^+ e^-\to J/\psi X$

abstract:
  We study the possibility of the scalar charmonium and glueball mixing in $e^+
e^-$ annihilation at $\sqrt{s}=10.6$ GeV. The effects can be used to explain
the unexpected large cross section ($12\pm 4$ fb) and the anomalous angular
distribution ($\alpha= -1.1^{+0.8}_{-0.6}$) of the exclusive $e^+e^-\to
J/\psi\chi_{c0}$ process observed by Belle experiments at KEKB. We calculate
the helicity amplitudes for the process $e^+ e^- \to J/\psi H(0^{++})$ in
NRQCD, where $H(0^{++})$ is the mixed state. We present a detailed analysis on
the total cross section and various angular asymmetries which could be useful
to reveal the existence of the scalar glueball state.


title: Highlights of Higgs Physics at LEP

abstract:
  Final results from the combined data of the four LEP experiments ALEPH,
DELPHI, L3 and OPAL on Standard Model (SM) Higgs boson searches are presented.
New preliminary results of searches in extended models are reviewed.


title: Formation of cosmological brane defects

abstract:
  We study cosmological formation of D-term strings, axionic strings, domain
walls and Q-balls in braneworld models of the Hanany-Witten type. For the
D-term strings, we show that the strings are the daughter branes extended
between mother branes. We show that the domain walls can be produced by
conventional cosmological phase transitions. In this case, the formation of the
domain walls is induced by the continuous deformation of the branes, which
means that they are not created as daughter branes. First we consider classical
configurations of the axionic strings and the domain walls, then we investigate
the quantum effect of the brane dynamics. We also study brane Q-balls and show
how they can be distinguished from conventional Q-balls.


title:
Scenarios about the long-time damage of silicon as material and
  detectors operating beyond LHC collider conditions

abstract:
  For the new hadron collider LHC and some of its updates in luminosity and
energy, as SLHC and VLHC, the silicon detectors could represent an important
option, especially for the tracking system and calorimetry. The main goal of
this paper is to analyse the expected long-time degradation in the bulk of the
silicon as material and for silicon detectors, in continuous radiation field,
in these hostile conditions. The behaviour of silicon in relation to various
scenarios for upgrade in energy and luminosity is discussed in the frame a
phenomenological model developed previously by the authors. Different silicon
material parameters resulting from different technologies are considered to
evaluate what materials are harder to radiation and consequently could minimise
the degradation of device parameters in conditions of continuous long time
operation.


title: NJL-model analysis of dense quark matter

abstract:
  Investigations of deconfined quark matter within NJL-type models are
reviewed, focusing on the regime of low temperatures and ``moderate''
densities, which is not accessible by perturbative QCD. Central issue is the
interplay between chiral symmetry restoration and the formation of color
superconducting phases. In order to lay a solid ground for this analysis, we
begin with a rather detailed discussion of two and three-flavor NJL models and
their phase structure, neglecting the possibility of diquark pairing in a first
step. An important aspect of this part is a comparison with the MIT bag model.
The NJL model is also applied to investigate the possibility of absolutely
stable strange quark matter. In the next step the formalism is extended to
include diquark condensates. We discuss the role and mutual influence of
several conventional and less conventional quark-antiquark and diquark
condensates. As a particularly interesting example, we analyze a spin-1 diquark
condensate as a possible pairing channel for those quarks which are left over
from the standard spin-0 condensate. For three-flavor systems, we find that a
self-consistent calculation of the strange quark mass, together with the
diquark condensates, is crucial for a realistic description of the 2SC-CFL
phase transition. We also study the effect of neutrality constraints which are
of relevance for compact stars. Both, homogeneous and mixed, neutral phases are
constructed. Although neutrality constraints generally tend to disfavor the 2SC
phase we find that this phase is again stabilized by the large values of the
dynamical strange quark mass which follow from the self-consistent treatment.
Finally, we combine our solutions with existing hadronic equations of state to
investigate the existence of quark matter cores in neutron stars.


title:
Comparisons of the Monte Carlo programs HORACE and WINHAC for
  single-W-boson production at hadron colliders

abstract:
  We present the comparisons of two independent Monte Carlo event generators,
HORACE and WINHAC, for single-W-boson production in hadronic collisions with
multiphoton effects in leptonic W decays. These comparisons were performed
first at the parton level with fixed quark-beams energy, and then at the hadron
level for proton-proton collisions at the LHC. In general, a good agreement
between the two programs has been found. Possible sources of differences in
some of the presented results are discussed. We also present and discuss the
effects of including non-zero quark masses for the main single-W-boson
observables at the LHC.


title: Complete O(\alpha) solution of the \mu-decay problem

abstract:
  In this talk I report on the results of a complete O(\alpha) calculation of
leptonic \mu-decay. The calculation is complete in the sense that all
polarization and mass effects have been included in the radiative corrections.
I mostly concentrate on the longitudinal polarization of the electron which
considerably differs from the naive value P_e^l=-1 in the threshold region,
both for the Born term and more so for the radiatively corrected case. I also
discuss the role of the O(\alpha) anomalous spin-flip contribution and its
description in terms of the equivalent particle approach which survives the m_e
-> 0 limit. Finally, I provide a brief account of the history of the O(\alpha)
radiative corrections to leptonic \mu-decay. I trace the error done in the
first (wrong) 1956 calculation of Behrends, Finkelstein and Sirlin. My account
of this historical error differs from that recently given in a talk by
Kinoshita on the occasion of the 70th birthday of Sirlin.


title:
Isospin breaking of the narrow charmonium state of Belle at 3872 MeV as
  a deuson

abstract:
  The narrow charmonium state near 3872 MeV reported by the Belle collaboration
and confirmedby CDF lies almost exactly at the neutral D anti-D* threshold. As
was predicted many years ago it can be a deuteronlike meson-meson state called
a deuson. If so, it should be an axial, or possibily a pseudoscalar state with
C=0, and isospin predominantly 0. Large isospin breaking is expected because of
the isospin mass splitting between the neutral and charged D (D*) mesons.
Because of this large isospin breaking the decay X(3872) to J/psi rho would be
allowed, while J/psi sigma would be forbidden by C-parity, as indicated by the
present data.


title:
Effects of Fermion Masses and Twisting on Non-Integrable Phases on
  Compact Extra Dimensions

abstract:
  The effective potential for the Wilson loop in the SU(2) gauge theory with
N_f massive fundamental and N_a massive adjoint fermions on S^1 x M^4 is
computed at the one-loop level, assuming periodic boundary conditions for the
gauge field and general boundary conditions for fermions. It is shown that
there are critical values for the bare mass, and the boundary condition
parameter for the adjoint fermions, beyond which the symmetry pattern changes.
However, neither bare mass, nor the boundary condition parameter for the
fundamental fermion play any role on the vacuum structure, thus the symmetry
breaking pattern. When the two different types of fermions with equal masses
exist together the pattern of the fundamental fermion dominate, and SU(2) gauge
symmetry remains intact independent of the fermion masses.


title: The eta->pi^0 pi^0 gamma gamma decay in GCHPT

abstract:
  Calculations of eta->pi^0 pi^0 gamma gamma decay in Generalized chiral
perturbation theory are presented. Tree level and next-to-leading corrections
are involved. Sensitivity to the violation of the standard counting is
discussed.


title: Axino Dark Matter and the CMSSM

abstract:
  If the axino is the lightest superpartner and satisfies cosmological bounds,
including a preferred range of the relic abundance of cold dark matter, then
the usual stringent constraints on the parameter space of the CMSSM become
greatly relaxed. The lightest superpartner of the usual CMSSM spectrum will
appear to be stable in collider experiments but will not necessarily obey relic
abundance constraints. It may be either neutral (lightest neutralino) or
charged (typically a stau). With the axino as cold dark matter, large regions
of the CMSSM, often corresponding to heavy superpartners, become allowed,
depending on the axino mass and the reheating temperature.


title: Loop corrections to sub-leading heavy quark currents in SCET

abstract:
  We compute the one-loop (hard) matching correction to heavy-to-light
transition currents in soft-collinear effective theory (SCET) to sub-leading
power in the SCET expansion parameter for an arbitrary Dirac structure of the
QCD weak current.


title: The pressure of QCD at finite temperature and quark number density

abstract:
  This paper is a slightly modified version of the introductory part of a
doctoral dissertation that contained also three original articles,
hep-ph/0212283, hep-ph/0305183 and hep-ph/0311323. Our purpose is to review the
history and present status of finite-temperature perturbation theory as applied
to the context of determining the equilibrium properties of quark-gluon plasma,
most notably the pressure of QCD at finite temperatures and quark chemical
potentials. We first introduce the general formalism of finite-temperature
field theory and perturbation theory, then follow through the evaluation of the
pressure order by order, and finally proceed to analyze the most recent, order
g^6ln(g) results by comparing the perturbative predictions with lattice data.
In the appendix we provide a somewhat pedagogical introduction to the most
important computational techniques used in the perturbative framework, namely
the analytic evaluation of multi-loop vacuum diagrams both in full QCD and in
its three-dimensional high-T effective theories.


title:
Probing Patterns of Supersymmetry Breaking using Phenomenological
  Constraints

abstract:
  Specific models of supersymmetry breaking predict relations between the
trilinear and bilinear soft supersymmetry breaking parameters A_0 and B_0 at
the input scale. Models with A_0 = B_0 + m_0 as well as the simplest Polonyi
model with A_0 = (3 - \sqrt{3}) m_0 are discussed. In such cases, the value of
\tanb can be calculated as a function of the scalar masses m_0 and the gaugino
masses m_{1/2}, and various experimental constraints can be applied to
constrain it.


title: Exotic baryons with charm number $\pm1$ from Skyrme model

abstract:
  We illustrate the exotic SU(3) baryon sub-multiplets in the SU(4) baryon
multiplets predicted from the flavor SU(4) collective-coordinate quantization,
and investigate the exotic states with charm number $C=\pm1$ up to leading
order of $1/N_c$ under chiral $SU(3)_L\times SU(3)_R$ symmetry and the heavy
quark limit from bound state approach. We find that there exist the
$\bar{15}$-plets and 24-plets with C=1 and the $\bar{6}$-plets, 15-plets and
$15^{\prime}$-plets with $C=-1$ bounded in this approach, qualitatively
consistent with predictions from the flavor SU(4) collective-coordinate
quantization. By fitting one unique parameter of leading SU(3) flavor symmetry
breaking term with the mass difference between $\Xi_c$ and $\Sigma_c$ and up to
$O(m_Q^0N_c^{-1})$, we give all the average masses of baryons in $\bar{6}$-plet
and 15-plet. Several general relations of these masses without any parameter
are also introduced.


title: The dihadron fragmentation function and its evolution

abstract:
  Dihadron fragmentation functions and their evolution are studied in the
process of $e^+e^-$ annihilation. Under the collinear factorization
approximation and facilitated by the cut-vertex technique, the two hadron
inclusive cross section at leading order (LO) is shown to factorize into a
short distance parton cross section and a long distance dihadron fragmentation
function. We provide the definition of such a dihadron fragmentation function
in terms of parton matrix elements and derive its DGLAP evolution equation at
leading log. The evolution equation for the non-singlet quark fragmentation
function is solved numerically with a simple ansatz for the initial condition
and results are presented for cases of physical interest.


title: India-based Neutrino Observatory

abstract:
  An introduction to India-based Neutrino Observatory and a brief status report
are presented.The two possible sites are described along with their special
advantages.The proposed detector and its physics capabilities for atmospheric
neutrinos and long-base-line experiments are discussed.


title: Phase Structure of Hot and/or Dense QCD in the Schwinger-Dyson Approach

abstract:
  We investigate the phase structure of hot and/or dense QCD with massless
2-flavors using the Schwinger-Dyson equation (SDE) with the improved ladder
approximation in the Landau gauge. We examine the effect of the antiquark
contribution and find that setting the antiquark Majorana mass equal to the
quark one is a good approximation in the medium density region. The imaginary
part of the Dirac mass has an important influence on the chiral phase
transition, in particular on the tricritical point.


title: Interpretation of electron-proton scattering at low Q^2

abstract:
  Low-Q^2 photons do not resolve partons in the proton, which gives problems
when applying the deep inelastic scattering formalism, such as an unphysical,
negative gluon density extracted from data. Considering instead hadronic
fluctuations of the photon, we show that the generalised vector meson dominance
model (GVDM) gives a good description of the measured cross section at low Q^2,
i.e. reproduces F_2(x,Q^2), using only few parameters with essentially known
values. Combining GVDM and parton density functions makes it possible to obtain
a good description of F_2 data over the whole range of x and Q^2.


title: Light in metric space-time and its deflection by the screw dislocation

abstract:
  We derive the light deflection caused by the screw dislocation in space-time.
Space-time is medium which can be deformed in such a way that its deformation
is equivalent to the existence of metric which is equivalent to gravity. The
existence of the screw dislocations in cosmology is hypothetically confirmed by
observation of light bursts which can be interpreted as the annihilation of the
giant screw dislocations with antidislocations. The origin of the gravitational
bursts are analogical as the optical ones. They can be probably detected by
LIGO, VIRGO, GEO, TAMA and so on. The dislocation theory of elementary
particles is discussed.


title:
The Majorana neutrino masses, neutrinoless double beta decay and nuclear
  matrix elements

abstract:
  The effective Majorana neutrino mass is evaluated by using the latest results
of neutrino oscillation experiments. The problems of the neutrino mass
spectrum,absolute mass scale of neutrinos and the effect of CP phases are
addressed. A connection to the next generation of the neutrinoless double beta
decay (0nbb-decay) experiments is discussed. The calculations are performed for
76Ge, 100Mo, 136Xe and 130Te by using the advantage of recently evaluated
nuclear matrix elements with significantly reduced theoretical uncertainty. An
importance of observation of the 0nbb-decay of several nuclei is stressed.


title: Theoretical Overview Quark Matter '04

abstract:
  The much wider transverse-momentum range accessible in heavy-ion collisions
at RHIC and at the LHC allows us to disentangle the dynamics of partonic
equilibration from the dynamics of delayed hadronization. This provides a novel
tool for testing the equilibration mechanisms underlying QCD thermodynamics.
Here, I argue, on the basis of simple formation-time arguments, why this is so,
and I review recent theoretical developments in this context.


title:
A unique parameterization of the QCD equation of state below and above
  T_c

abstract:
  We present a unique parameterization of the equation of state of strongly
interacting matter in the temperature interval 0.6 T_c ... 3 T_c at \mu = 0
within a quasi-particle model based on quark and gluon degrees of freedom. The
extension to non-vanishing baryon-chemical potential is discussed.


title:
Hyperfine meson splittings: chiral symmetry versus transverse gluon
  exchange

abstract:
  Meson spin splittings are examined within an effective Coulomb gauge QCD
Hamiltonian incorporating chiral symmetry and a transverse hyperfine
interaction necessary for heavy quarks. For light and heavy quarkonium systems
the pseudoscalar-vector meson spectrum is generated by approximate BCS-RPA
diagonalizations. This relativistic formulation includes both S and D waves for
the vector mesons which generates a set of coupled integral equations. A smooth
transition from the heavy to the light quark regime is found with chiral
symmetry dominating the pi-rho mass difference. A reasonable description of the
observed meson spin splittings and chiral quantities, such as the quark
condensate and the pi mass, is obtained. Similar comparisons with TDA
diagonalizations, which violate chiral symmetry, are deficient for light
pseudoscalar mesons indicating the need to simultaneously include both chiral
symmetry and a hyperfine interaction. The eta_b mass is predicted to be around
9400 MeV consistent with other theoretical expectations and above the
unconfirmed 9300 MeV candidate. Finally, for comparison with lattice results,
the J reliability parameter is also evaluated.


title:
Prospects for the Search for a Standard Model Higgs Boson in ATLAS using
  Vector Boson Fusion

abstract:
  The potential for the discovery of a Standard Model Higgs boson in the mass
range m_H < 2 m_Z in the vector boson fusion mode has been studied for the
ATLAS experiment at the LHC. The characteristic signatures of additional jets
in the forward regions of the detector and of low jet activity in the central
region allow for an efficient background rejection. Analyses for the H -> WW
and H -> tau tau decay modes have been performed using a realistic simulation
of the expected detector performance. The results obtained demonstrate the
large discovery potential in the H -> WW decay channel and the sensitivity to
Higgs boson decays into tau-pairs in the low-mass region around 120 GeV.


title: On an Intensity-Ratio Equivalence-Theorem for Top Quark Decay

abstract:
  For the " t --> W b " decay mode, an intensity-ratio equivalence-theorem for
two Lorentz-invariant couplings is shown to be related to symmetries of
tWb-transformations. Explicit tWb-transformations, A_{+}=M A_{SM}, P A_{SM}, B
A_{SM} relate the four standard model's helicity amplitudes and those in the
case of an additional " t_R --> b_L " weak-moment of relative strength "
Lambda_{+} =E_W /2 = 53 GeV ". Two commutator plus anti-commutator symmetry
algebras are generated from M, P, B. These transformations enable a
characterization of the associated mass scales.


title:
High energy pA collisions in the color glass condensate approach I.
  Gluon production and the Cronin effect

abstract:
  We study gluon production in high energy proton-nucleus collisions in the
semi-classical framework of the Color Glass Condensate. We develop a general
formalism to compute gluon fields in covariant gauge to lowest order in the
classical field of the proton and to all orders in the classical field of the
nucleus. The use of the covariant gauge makes the diagrammatic interpretation
of the solution more transparnt. k_t-factorization holds to this order for
gluon production -- Our results for the gluon distribution are equivalent to
the prior diagrammatic analysis of Kovchegov and Mueller. We also show that
these results are equivalent to the computation of gluon production by Dumitru
and McLerran in the Fock-Schwinger gauge. We demonstrate how the Cronin effect
arises in this approach, and examine its behavior in the two extreme limits of
a) no small-x quantum evolution, and b) fully saturated quantum evolution. In
both cases, the formalism reduces to Glauber's formalism of multiple
scatterings. We comment on the possible implications of this study for the
interpretation of the recent results on Deuteron-Gold collisions at the
Relativistic Heavy Ion Collider (RHIC).


title:
High energy pA collisions in the color glass condensate approach II.
  Quark production

abstract:
  We compute the production of quark-antiquark pairs in high energy collisions
between a small and a large projectile, as in proton-nucleus collisions, in the
framework of the Color Glass Condensate. We derive a general expression for
quark pair-production, which is not k_t-factorizable. However,
k_t-factorization is recovered in the limit of large mass pairs or large
quark--anti-quark momenta. Our results are amenable to a simple interpretation
and suggest how multi-parton correlations at small x can be quantified in
high-energy proton/deuteron-nucleus collisions.


title: Charged lepton contributions to the solar neutrino mixing and theta_13

abstract:
  A charged lepton contribution to the solar neutrino mixing induces a
contribution to theta_13, barring cancellations/correlations, which is
independent of the model building options in the neutrino sector. We illustrate
two robust arguments for that contribution to be within the expected
sensitivity of high intensity neutrino beam experiments. We find that the case
in which the neutrino sector gives rise to a maximal solar angle (the natural
situation if the hierarchy is inverse) leads to a theta_13 close to or
exceeding the experimental bound depending on the precise values of theta_12,
theta_23, an unknown phase and possible additional contributions. We finally
discuss the possibility that the solar angle originates predominantly in the
charged lepton sector. We find that the construction of a model of this sort is
more complicated. We comment on a recent example of natural model of this type.


title: Active-sterile neutrino oscillations and pulsar kicks

abstract:
  We develop a thorough description of neutrino oscillations in a magnetized
protoneutron star, based on a resonance layer for neutrinos with different
momentum directions. We apply our approach to the calculation of the asymmetry
in the neutrino emission during the birth of a neutron star and the pulsar
acceleration in the case of an active-sterile neutrino resonant conversion. The
observed velocities can be obtained with the magnetic fields expected in the
interior of a protoneutron star, for sterile neutrino masses of the order of
KeV and small mixing angles.


title: A Diquark-Triquark Model for the KN Pentaquark

abstract:
  We propose a model for the recently discovered Theta^+ exotic KN resonance as
a novel kind of a pentaquark with an unusual color structure: a color triplet
(ud) diquark, coupled to a color anti-triplet (ud s-bar) triquark in a relative
P-wave. The state has J^P=1/2^+, I=0 and is an antidecuplet of SU(3)_f. A rough
mass estimate of this pentaquark is close to experiment.


title: Spectrum and decays of kaonic hydrogen

abstract:
  By using the non-relativistic effective Lagrangian approach to bound states,
a complete expression for the isospin-breaking corrections to the energy levels
and the decay widths of kaonic hydrogen is obtained up-to-and-including
O(alpha,m_d-m_u) in QCD. It is demonstrated that, although the leading-order
corrections at O(alpha^{1/2},(m_d-m_u)^{1/2}) emerging due to the unitarity
cusp, are huge, they can be expressed solely in terms of the KN S-wave
scattering lengths. Consequently, at leading order, it is possible to derive
parameter-free modified Deser-type relations, which can be used to extract the
scattering lengths from the hadronic atom data.


title: Does The $\triangle I ={1/2}$ Rule Hold In D And B $\to \pi \pi$ Decays?

abstract:
  Although two pion decays of $K$, $D$ and $B$ have similar isospin structures,
there are dramatic differences in the ratios $R_K$ and $R_{D,B}$ of amplitudes
from $\Delta I =3/2$ and $\Delta I =1/2$ interactions. In $K\to \pi\pi$ decays
there is the famous $\Delta I =1/2$ rule with $R_K \approx 1/22$, whereas in
$B(D) \to \pi\pi$ decays the ratios $R_{D,B}$ are of order one and therefore
there is no such a rule. In this work we study decay amplitudes in $B(D)\to
\pi\pi$ using QCD factorization calculations paying particular attention to
discrepancies between data and theoretical estimates. Since isospin does not
play a special role in factorization calculations, no $\Delta I =1/2$ rule is
expected. We find that theoretical results on the size of the amplitudes are in
qualitative agreement with data. However the phases for the amplitudes are very
different. We show that the effects of re-scattering between the two pions in
the final state can play a crucial rule in understanding the differences
between $B(D)\to \pi\pi$ and $K\to \pi\pi$ decays. We also comment on the role
of isospin analysis which applies to the study of CP violation in $B\to \pi
\pi$ decays.


title: Sigma and hydrodynamic modes along the critical line

abstract:
  Assuming a tricritical point of the two--flavor QCD in the space of
temperature, baryon number chemical potential and quark mass, we study the
change of the associated soft mode along the critical line within the
Ginzburg--Landau approach and the Nambu--Jona-Lasinio model. The ordering
density along the chiral critical line is the scalar density whereas a linear
combination of the scalar, baryon number and energy densities becomes the
proper ordering density along the critical line with finite quark masses. It is
shown that the critical eigenmode shifts from the sigma--like fluctuation of
the scalar density to a hydrodynamic mode at the tricritical point, where we
have two ordering densities, the scalar density and a linear combination of the
baryon number and energy densities. We argue that appearance of the critical
eigenmode with hydrodynamic character is a logical consequence of divergent
susceptibilities of the conserved densities.


title: Neutrinos: "...annus mirabilis"

abstract:
  Main results and achievements of 2002 - 2003 in neutrino physics are
summarized. The field moves quickly to new phase with clear experimental and
phenomenological programs, and with new theoretical puzzle which may lead us to
discoveries of the fundamental importance. One of the main results is amazing
pattern of the lepton mixing which emerges from the data. The key questions
are: Does lepton mixing imply new symmetry of Nature? Is the large (maximal?)
mixing related to degeneracy of the neutrino mass spectrum? In this connection
priorities of the future studies are formulated.


title: Numerical evaluation of phase space integrals by sector decomposition

abstract:
  In a series of papers we have developed the method of iterated sector
decomposition for the calculation of infrared divergent multi-loop integrals.
Here we apply it to phase space integrals to calculate a contribution to the
double real emission part of the e+e- -> 2 jets cross section at NNLO. The
explicit cancellation of infrared poles upon summation over all possible cuts
of a given topology is worked out in detail for a specific example.


title: Solar neutrinos as probes of neutrino-matter interactions

abstract:
  Data from solar neutrino and KamLAND experiments have led to a discovery of
nonzero neutrino masses. Here we investigate what these data can tell us about
neutrino interactions with matter, including the poorly constrained
flavor-changing nu_e-nu_tau interactions. We give examples of the interaction
parameters that are excluded by the solar/KamLAND data and are beyond the reach
of other experiments. We also demonstrate that flavor-changing interactions, at
the allowed level, may profoundly modify the conversion probability for
neutrinos of energy <~ 6 MeV and the values of the mass parameter inferred from
the data. The implications for future experiments are discussed.


title:
Explaining $\Omega_{Baryon} \approx 0.2 \Omega_{Dark}$ through the
  synthesis of ordinary matter from mirror matter: a more general analysis

abstract:
  The emerging cosmological picture is of a spatially flat universe composed
predominantly of three components: ordinary baryons ($\Omega_B \approx 0.05$),
non-baryonic dark matter ($\Omega_{Dark} \approx 0.22$) and dark energy
($\Omega_{\Lambda} \approx 0.7$). We recently proposed that ordinary matter was
synthesised from mirror matter, motivated by the argument that the observed
similarity of $\Omega_B$ and $\Omega_{Dark}$ suggests an underlying similarity
between the fundamental properties of ordinary and dark matter particles. In
this paper we generalise the previous analysis by considering a wider class of
effective operators that non-gravitationally couple the ordinary and mirror
sectors. We find that while all considered operators imply $\Omega_{Dark} = $
few$\times \Omega_B$, only a subset quantitatively reproduce the observed ratio
$\Omega_B/\Omega_{Dark} \approx 0.20$. The $\sim 1$ eV mass scale induced
through these operators hints at a connection with neutrino oscillation
physics.


title:
Diagonal Matrix Elements of the Effective Hamiltonian for
  $K^{0}-\bar{K}^{0} $ System in One Pole Approximation

abstract:
  We study the properties of time evolution of the $K^{0}-\bar{K}^{0} $ system
in spectral formulation. Within the one--pole model we find the exact form of
the diagonal matrix elements of the effective Hamiltonian for this system. It
appears that, contrary to the Lee--Oehme--Yang (LOY) result, these exact
diagonal matrix elements are different if the total system is CPT--invariant
but CP--noninvariant.


title: Deconstructing Non-Abelian Gauge Theories at One Loop

abstract:
  Deconstruction of 5D Yang-Mills gauge theories is studied in next-to-leading
order accuracy. We calculate one-loop corrections to the mass spectrum of the
non-linear gauged sigma-model, which is the low energy effective theory of the
deconstructed theory. Renormalization is carried out following the standard
procedure of effective field theories. The relation between the radius of the
compactified fifth dimension and the symmetry breaking scale of the non-linear
sigma-model is modified by radiative corrections. We demonstrate that one can
match the low lying spectrum of the gauge boson masses of the effective 4D
gauged non-linear sigma-model to the Kaluza-Klein modes of the 5D theory at
one-loop accuracy.


title: Detecting the neutral top-pion at $e^{+}e^{-}$ colliders

abstract:
  We investigate some processes of the associated production of a neutral
top-pion $\Pi^{0}_{t}$ with a pair of fermions($e^{+}e^{-}\to
f\bar{f}\Pi^{0}_{t}$) in the context of top-color-assisted technicolor(TC2)
theory at future $e^{+}e^{-}$ colliders.
  The studies show that the largest cross sections of the processes
$e^{+}e^{-}\to f'\bar{f'}\Pi^{0}_{t}(f'=u,d,c,s,\mu,\tau)$ could only reach the
level of 0.01fb, we can hardly detect a neutral top-pion through these
processes. For the processes $e^{+}e^{-}\to e^{+}e^{-}\Pi^{0}_{t}$,
$e^{+}e^{-}\to t\bar{t}\Pi^{0}_{t}$ and $e^{+}e^{-}\to b\bar{b}\Pi^{0}_{t}$,
the cross sections of these processes are at the level of a few fb for the
favorable parameters and a few tens, even hundreds, of neutral top-pion events
can be produced at future $e^{+}e^{-}$ colliders each year through these
processes. With the clean background of the flavor-changing $t\bar{c}$ channel,
the top-pion events can possibly be detected at the planned high luminosity
$e^{+}e^{-}$ colliders. Therefore, such neutral top-pion production processes
provide a useful way to detect a neutral top-pion and test the TC2 model
directly.


title: Flat space modified particle dynamics induced by Loop Quantum Gravity

abstract:
  Starting from an heuristic approach to the semiclassical limit in loop
quantum gravity, the construction of effective Hamiltonians describing Planck
length corrections to the propagation of photons and spin 1/2 fermions, leading
to modified energy-momentum relations, is summarized. Assuming the existence of
a privileged reference frame, we also review the determination of stringent
bounds upon the parameters labelling such corrections, based upon already
existing experimental data, which are found to be from five to nine orders of
magnitude below the expected values.


title: A Simple Statistical Model for QGP Phenomenology

abstract:
  We propose a simple statistical model for the density of states for quarks
and gluons in a QGP droplet, making the Thomas-Fermi model of the atom and the
Bethe-model for the nucleons as templates for constructing the density of
states for the quarks and gluons with due modifications for the `hot'
relativistic QGP state as against the `cold' non-relativistic atom and
nucleons, which were the subject of the earlier `forebears' of the present
proposal.We introduce `flow-parameters' $\gamma_{q,g}$ for the quarks and the
gluons to take care of the hydrodynamical (plasma) flows in the QGP system as
was done earlier by Peshier in his thermal potential for the QGP. By varying
$\gamma_{g}$ about the `Peshier-Value' of $\gamma_{q} = 1/6$, we find that the
model allows a window in the parametric space in the range $8\gamma_{q} \leq
\gamma_{g} \leq 12\gamma_{q}$, with $\gamma_{q} =1/6$ (Peshier-Value), when
stable QGP droplets of radii $\sim$ $6 fm$ appear at transition temperatures
$100 MeV \leq T \leq 250 MeV$. The smooth cut at the phase boundary of the Free
energy vs. droplet radius suggests a First - Order phase transition .On the
whole the model offers a robust tool for studying QGP phenomenology as and when
data from various ongoing experiments are available .


title:
The effects of enhanced Z penguins on lepton polarizations in $B \to X_s
  \ell^+ \ell^-$

abstract:
  The sensitivity of the $B \to \pi K$ mode to electroweak penguins and the
recent experimental data for the $B \to \pi \pi$, $\pi K$ modes has given rise
to what is known as the ``$B \to \pi K$ puzzle''. Recently it has been observed
that this {\sl puzzle} can be resolved by considering the new physics which can
enter via $Z^0$ penguins. In this note we analyze the effect of this enhanced
$Z^0$ penguins on the lepton polarization asymmetries of $b \to s \ell^+
\ell^-$.


title:
Expectation values of flavor-neutrino currents in field theoretical
  approach to oscillation problem -- formulation

abstract:
  As a possible approach to the neutrino oscillation on the basis of quantum
field theory, the expectation values of the flavor-neutrino currents are
investigated by employing the finite-time transition matrix in the interaction
representation. Such expectation values give us in the simplest form a possible
way of treating the neutrino oscillation without recourse to any one
flavor-neutrino states. The present paper is devoted to presenting the
formulation and the main structures of the relevant expectation values.


title: J/psi Absorption in Heavy Ion Collisions

abstract:
  We present a new calculation of the pi-J/psi dissociation cross sections
within the Constituent Quark-Meson Model recently introduced. To discuss the
absorption of J/psi in heavy-ion collisions, we assume the J/psi to be produced
inside a thermalized pion gas, as discussed by Bjorken, and introduce the
corrections due to absorption by nuclear matter as well. We fit the absorption
length of the J/psi to the data obtained at the CERN SPS by the NA50
Collaboration for Pb-Pb collisions. Collisions of lower centrality allow us to
determine the temperature and the energy density of the pion gas. For both
these quantities we find values close to those indicated by lattice gauge
calculations for the transition to a quark-gluon plasma. A simple extrapolation
to more central collisions, which takes into account the increase of the energy
deposited due to the increased nucleon flux, fails to reproduce the break in
J/psi absorption indicated by NA50, thus lending support to the idea that an
unconfined quark-gluon phase may have been produced. This conclusion could be
sharpened by analysing in a similar way, as a function of centrality, other
observables such as strange particle production.


title: Sneutrino brane inflation and leptogenesis

abstract:
  Modifications to the Friedmann equation in brane cosmology can have important
implications for early universe phenomena such as inflation and the generation
of the baryon asymmetry. We study a simple scenario of chaotic brane inflation
where, in a minimal supersymmetric seesaw model, the scalar superpartner of a
heavy singlet Majorana neutrino drives inflation and, simultaneously, generates
the required lepton asymmetry through its direct out-of-equilibrium decays
after the inflationary era. For a gravitino mass in the range 100 GeV - 1 TeV,
we find that successful nucleosynthesis and leptogenesis in this framework
require that the 5D Planck mass is in the range M5 ~ 10^10 - 10^13 GeV and the
reheating temperature Trh ~ 10^6 - 10^8 GeV.


title:
Polarization observables in the processes $p+p\to \Theta^+ +\Sigma^+$
  and $n+p\to \Theta^+ +\Lambda^0$, for any spin and parity of the
  $\Theta^+$-hyperon in the threshold region

abstract:
  Using the symmetry properties of the strong interaction, such as the Pauli
principle, the P-invariance, the conservation of the total angular momentum and
isotopic invariance, we establish the spin structure of the threshold matrix
elements for the processes $p+p\to \Theta^+ +\Sigma^+$ and $n+p\to \Theta^+
+\Lambda^0$, in a model independent way, which applies to any spin and parity
of the $\Theta^+$-hyperon in the near threshold region. We predict the double
spin observables for these processes, such as the dependence of the
differential cross section on the polarizations of the colliding nucleons, and
the coefficients of polarization transfer from a nucleon beam or target to the
produced $\Sigma^+$ or $\Lambda^0$ hyperon. We prove that these observables are
sensitive to the P-parity of the $\Theta^+$ baryon, for any value of its spin.
As an example of dynamical considerations, we analyzed these reactions in the
framework of K-meson exchange.


title: Brane oscillations and the cosmic coincidence problem

abstract:
  We show that, under general assumptions, in six-dimensional brane-world
models with compactified large extra dimensions, the energy density of brane
oscillations scales as that of cold dark matter and its present value is
compatible with observations. Such value is obtained from the only dimensional
scale in the theory, namely, the fundamental scale of gravity in six dimensions
$M_6\sim 1$ TeV, without any fine-tuning or the introduction of additional mass
scales apart from the large size of the extra dimensions. It has been suggested
that the same kind of models could provide also the correct magnitude of the
cosmological constant. This observation can be relevant for the resolution of
the cosmic coincidence problem in the brane-world scenario.


title:
Cosmogenic neutrinos and signals of TeV gravity in air showers and
  neutrino telescopes

abstract:
  The existence of extra dimensions allows the possibility that the fundamental
scale of gravity is at the TeV. If that is the case, gravity could dominate the
interactions of ultra-high energy cosmic rays. In particular, the production of
microscopic black holes by cosmogenic neutrinos has been estimated in a number
of papers. We consider here gravity-mediated interactions at larger distances,
where they can be calculated in the eikonal approximation. We show that for the
expected flux of cosmogenic neutrinos these elastic processes give a stronger
signal than black hole production in neutrino telescopes. Taking the bounds on
the higher dimensional Planck mass M_D (D=4+n) from current air shower
experiments, for n=2 (6) elastic collisions could produce up to 118 (34) events
per year at IceCube. On the other hand, the absence of any signal would imply a
bound of M_D>~5 TeV.


title: Real radiation at NNLO: e^+e^- to 2 jets through O(alpha_s^2)

abstract:
  We present a calculation of the differential two jet cross section in e^+e^-
annihilation through next-to-next-to-leading order in the strong coupling
constant alpha_s. The calculation is performed using a new method for dealing
with real radiation suggested by us recently. For the first time, the two jet
event rate is computed directly, without any reference to the inclusive
cross-section e^+e^- to hadrons. We also calculate the energy distribution of
the leading jet in e^+e^- to 2 jets, and find significant modifications of the
shape of this distribution at NNLO.


title: Electroweak corrections to $\gamma Z$ production at hadron colliders

abstract:
  In this paper we present the results from a calculation of the full
electroweak one-loop corrections for $\gamma Z$ vector-boson pair production at
hadron colliders. The cases of proton--antiproton as well as proton--proton
collisions, at the Tevatron and the LHC, respectively, are considered. Results
are presented for the distribution of the $\gamma Z$ invariant mass and for the
transverse momentum of the final-state photon. The higher-order electroweak
effects are numerically significant, in particular for probing possible
anomalous gauge-boson couplings.


title:
Smooth hybrid inflation in supergravity with a running spectral index
  and early star formation

abstract:
  It is shown that in a smooth hybrid inflation model in supergravity adiabatic
fluctuations with a running spectral index with $\ns >1$ on a large scale and
$\ns <1$ on a smaller scale can be naturally generated, as favored by the
first-year data of WMAP. It is due to the balance between the nonrenormalizable
term in the superpotential and the supergravity effect. However, since smooth
hybrid inflation does not last long enough to reproduce the central value of
observation, we invoke new inflation after the first inflation. Its initial
condition is set dynamically during smooth hybrid inflation and the spectrum of
fluctuations generated in this regime can have an appropriate shape to realize
early star formation as found by WMAP. Hence two new features of WMAP
observations are theoretically explained in a unified manner.


title: Toward a New Phenomenon: Super-Cerenkov Radiation

abstract:
  In this letter a new coherent gamma emission mechanism, called Super-Cerenkov
radiation, is introduced. The SCR is expected to take place when the charged
particle is moving in a medium with a phase velocity satisfying the
super-coherent condition. The results on an experimental test of SCR in RICH
detector are presented.


title: Decay H^+ -> W^+ gamma in a nonlinear R_xi-gauge

abstract:
  A new evaluation of the charged Higgs boson decay $H^+ -> W^+\gamma$ is
presented in the context of the general two-Higgs doublet model. A nonlinear
$R_\xi$-gauge which considerably simplifies the calculation is introduced and
simple expressions are obtained for the fermionic and bosonic contributions.
The $H^+ -> W^+\gamma$ branching ratio is analyzed for several values of the
parameters of the model. Although this decay can have a branching fraction as
large as $10^{-4}$ in a certain region of the parameter space, it is found that
such a region is disfavored by the most recent constraints on $b -> s\gamma$,
$g-2$ of the muon, $Z -> b \bar b$, and the $\rho$ parameter, along with the
exclusions from direct searches at the CERN $e^-e^+$ LEP collider. The
possibility of detecting this decay at future colliders is discussed.


title: The hadronic contributions to the anomalous magnetic moment of the muon

abstract:
  We present a new, completely revised calculation of the muon anomalous
magnetic moment, $a_\mu=(g_{\mu}-2)/2$, comparing it with the more recent
experimental determination of this quantity; this furnishes an important test
of theories of strong, weak and electromagnetic interactions. These theoretical
and experimental determinations give the very precise numbers, $$10^{11}\times
a_\mu=\cases{116 591 806\pm50\pm10 ({\rm rad.})\pm30
(\ell\times\ell)\quad\hbox{[Th., no $\tau$]}\cr 116 591 889\pm49\pm10 ({\rm
rad.})\pm30 (\ell\times\ell)\quad\hbox{[Theory, $\tau$]}\cr 116 592
080\pm60\quad\hbox{[Experiment]}.\cr}$$ In the theoretical evaluations, the
first quantity does not, and the second one does, use information from $\tau$
decay. The first errors for the theoretical evaluations include statistical
plus systematic errors; the other ones are the estimated errors due to
incomplete treatment of radiative corrections and the estimated error in the
light-by-light scattering contribution. We thus have a significant mismatch
between theory and experiment. We also use part of the theoretical calculations
to give a precise evaluation of the electromagnetic coupling on the $Z$,
$\bar{\alpha}_{\rm Q.E.D.}(M^2_{Z})$, of the masses and widths of the (charged
and neutral) rho resonances, of the scattering length and effective range for
the P wave in $\pi\pi$ scattering, and of the quadratic radius and second
coefficient of the pion form factor.


title: Independent pair parton interactions-model of hadron interactions

abstract:
  A model of independent pair parton interactions is proposed, according to
which, hadron interactions are represented by a set of independent binary
parton collisions. The final multiplicity distribution is described by a
convolution of the negative binomial distributions in each of the partonic
collisions. As a result, it is given by a weighted sum of negative binomial
distributions with parameters multiplied by the number of active pairs. Its
shape and moments are considered. Experimental data on multiplicity
distributions in high energy $p\bar p$ processes are well fitted by these
distributions. Predictions for the CERN Large Hadron Collider and higher
energies are presented. The difference between $e^+e^-$ and $p\bar p$ processes
is discussed.


title: Naturally small Dirac neutrino masses in supergravity

abstract:
  We show that Dirac neutrino masses of the right size can arise from the
Kahler potential of supergravity. They are proportional to the supersymmetry
and the electroweak breaking scales. We find that they have the experimentally
observed value provided that the ultraviolet cut-off of the Minimal
Supersymmetric Standard Model (MSSM) is between the Grand Unification (GUT)
scale and the heterotic string scale. If lepton number is not conserved, then
relatively suppressed Majorana masses can also be present, resulting in
pseudo-Dirac neutrino masses.


title:
Solar Neutrino Oscillation Parameters in Experiments with Reactor
  Anti-Neutrinos

abstract:
  We review the current status of the solar neutrino oscillation parameters. We
discuss the conditions under which measurements from future solar neutrino
experiments would determine the oscillation parameters precisely. Finally we
expound the potential of long baseline reactor anti-neutrino experiments in
measuring the solar neutrino oscillation parameters.


title:
Probing complex phase of the photon-photon-Higgs vertex at photon
  colliders

abstract:
  We study the effects of heavy Higgs bosons on the top-pair production process
at photon linear colliders. The interference patterns between the resonant
Higgs-production amplitudes and the continuum QED amplitudes are examined. The
patterns tell us not only the CP nature of the Higgs bosons but also the phase
of the $\gamma\gamma$--Higgs vertex which gives new information about the Higgs
couplings to new charged particles.


title: Charming penguins in B -> PP decays and the extraction of gamma

abstract:
  It is shown that inclusion of charming penguins of the size suggested by
short-distance dynamics may shift down by $10^o-15^o$ the value of $\gamma $
extracted via the overall fit to the $B \to PP $ branching ratios. A
substantial dependence of the fit on their precise values is found,
underscoring the need to improve the reliability of data.


title: Ultrarelativistic nucleus-nucleus collisions and the quark-gluon plasma

abstract:
  We present an overview of selected aspects of ultrarelativistic
nucleus-nucleus collisions, a research program devoted to the study of strongly
interacting matter at high energy densities and in particular to the
characterization of the quark-gluon plasma (QGP). The basic features of the
phase diagram of nuclear matter, as currently understood theoretically, are
discussed. The experimental program, carried out over a broad energy domain at
various accelerators, is briefly reviewed, with an emphasis on the global
characterization of nucleus-nucleus collisions. Two particular aspects are
treated in more detail: i) the application of statistical models to a
phenomenological description of particle production and the information it
provides on the phase diagram; ii) the production of hadrons carrying charm
quarks as messengers from the QGP phase.


title: SU(3) Chiral Effective Field Theories -- A Status Report --

abstract:
  A personal overview on the present status of SU(3) chiral perturbation theory
in the baryonic sector is given. Recent developments are presented and
remaining challenges are pointed out.


title: eta, eta-prime photoproduction and electroproduction off protons

abstract:
  Photo- and electroproduction of eta, eta-prime mesons on protons are
investigated within a relativistic chiral unitary approach based on coupled
channels. The s wave potentials for electroproduction and meson-baryon
scattering are derived from a chiral effective Lagrangian which includes the
eta-prime as an explicit degree of freedom and incorporates important features
of the underlying QCD Lagrangian such as the axial U(1) anomaly. The effective
potentials are iterated in a Bethe-Salpeter equation and cross sections for
eta, eta-prime photo- and electroproduction from protons are obtained. The
results for the eta-prime photoproduction cross section reproduce the
appearance of an S_(11) resonance around 1.9 GeV observed at ELSA. The
inclusion of electromagnetic form factors increases the predicted eta
electroproduction cross sections, providing a qualitative explanation for the
hard form factor of the photocoupling amplitude observed at CLAS.


title: The number of colors in the decays pi^0, eta, eta-prime -> gamma gamma

abstract:
  The decays pi^0, eta, eta-prime -> gamma gamma are investigated up to
next-to-next-to-leading order in the framework of the combined 1/N_c and chiral
expansions. Without mixing of the pseudoscalar mesons the N_c independence of
the pi^0 and eta decay amplitudes is shown to persist at the one-loop level,
although the contribution of the Wess-Zumino-Witten term to the pertinent
vertices is not canceled by the N_c dependent part of a Goldstone-Wilczek term.
The decay amplitude of the singlet field, on the other hand, depends strongly
on N_c and yields under the inclusion of mixing also a strong N_c dependence
for the eta decay. Both the eta and eta-prime decay are suited to confirm the
number of colors to be N_c=3.


title:
Les Houches "Physics at TeV Colliders 2003" Beyond the Standard Model
  Working Group: Summary Report

abstract:
  The work contained herein constitutes a report of the ``Beyond the Standard
Model'' working group for the Workshop "Physics at TeV Colliders", Les Houches,
France, 26 May--6 June, 2003. The research presented is original, and was
performed specifically for the workshop. Tools for calculations in the minimal
supersymmetric standard model are presented, including a comparison of the dark
matter relic density predicted by public codes. Reconstruction of
supersymmetric particle masses at the LHC and a future linear collider facility
is examined. Less orthodox supersymmetric signals such as non-pointing photons
and R-parity violating signals are studied. Features of extra dimensional
models are examined next, including measurement strategies for radions and
Higgs', as well as the virtual effects of Kaluza Klein modes of gluons. An LHC
search strategy for a heavy top found in many little Higgs model is presented
and finally, there is an update on LHC $Z'$ studies.


title: The effects of colored quark entropy on the bag pressure

abstract:
  We study the effects of the ground state entropy of colored quarks upon the
bag pressure at low temperatures. The vacuum expectation values of the quark
and gluon fields are used to express the interactions in QCD ground state in
the limit of low temperatures and chemical potentials. Apparently, the
inclusion of this entropy in the equation of state provides the hadron
constituents with an additional heat which causes a decrease in the effective
latent heat inside the hadronic bag and consequently decreases the
non-perturbative bag pressure. We have considered two types of baryonic bags,
$\Delta$ and $\Omega^-$. In both cases we have found that the bag pressure
decreases with the temperature. On the other hand, when the colored quark
ground state entropy is not considered, the bag pressure as conventionally
believed remains constant for finite temperature.


title: Superconvergence Relations and Parity Violating analogue of GDH sum rule

abstract:
  Sum rules of superconvergence type for parity violating amplitudes (p.v.
analogue of Gerasimov-Drell-Hearn sum rule) are considered. Elementary
processes initiated by polarized photons in the lowest order of electroweak
theory are calculated as examples illustrating the validity of the p.v.sum
rules. The parity violating polarized photon-induced processes for proton
target are considered in the frame of effective low energy theories and
phenomenological models based on p.v. nucleon-meson effective interactions.
Assuming the saturation of p.v. sum rule the possibility to limit the range of
the parameters, poorly known from existing experimental data and used in these
models is discussed. The asymmetries for p.v. $\pi^0$ and $\pi^+$ production,
measurable in future high intensity polarized photon beams experiments, are
given.


title: Heavy quark production from Color Glass Condensate at RHIC

abstract:
  I consider production of heavy quarks in pA and AA collisions in the
framework of the Color Glass Condensate. I discuss the heavy quark production
in pA collisions in a classical approximation which takes into account all
multiple rescatterings of a proton in a nucleus. For peripheral collisions,
heavy quark production cross section can be written in $k_T$-factorized form.
The $k_T$ factorization is used to construct a simple model which takes into
account both classical and quantum effects in pA and AA collisions. I review
the main result of calculation based on that model: open charm in the central
rapidity region at RHIC gets suppressed as a function of rapidity. Although the
numbers obtained for the suppression factor are model dependent, the very fact
of suppression is the general feature of the Color Glass Condensate at RHIC
kinematical region. It indicates the onset of quantum evolution effects in a
nucleus and is universal for all inclusive processes.


title:
Precise Determination of |V{us}| from Lattice Calculations of
  Pseudoscalar Decay Constants

abstract:
  Combining the ratio of experimental kaon and pion decay widths, Gamma(K to mu
antineutrino{mu} (gamma)) / Gamma(pi to mu \antineutrino (gamma)), with a
recent lattice gauge theory calculation of f{K}/f{pi} provides a precise value
for the CKM quark mixing matrix element |V{us}|=0.2236(30) or if 3 generation
unitarity is assumed |V{us}|=0.2238(30). Comparison with other determinations
of that fundamental parameter, implications, and an outlook for future
improvements are given.


title: Frontiers in Cosmic Rays

abstract:
  This rapporteur review covers selected results presented in the Parallel
Session HEA2 (High Energy Astrophysics 2) of the 10th Marcel Grossmann Meeting
on General Relativity, held in Rio de Janeiro, Brazil, July 2003. The subtopics
are: ultra high energy cosmic ray anisotropies, the possible connection of
these energetic particles with powerful gamma ray bursts, and new exciting
scenarios with a strong neutrino-nucleon interaction in the atmosphere.


title: Single Hadron Production in Deep Inelastic Scattering

abstract:
  The NLO-QCD correction to single hadron production in deep inelastic
scattering is calculated. We require the final state meson to carry a
non-vanishing transversal momentum, thus being sensitive to perturbative QCD
effects. Factorization allows us to convolute the hard scattering process with
parton densities and fragmentation functions. The predictions are directly
comparable to experimental results at the HERA collider at DESY. The results
are sensitive to the gluon density in the proton and allow us to test
universality of fragmentation functions.


title: Phenomenology of TeV Right-handed Neutrino and the Dark Matter Model

abstract:
  In a model of TeV right-handed (RH) neutrino by Krauss, Nasri, and Trodden,
the sub-eV scale neutrino masses are generated via a 3-loop diagram with the
vanishing see-saw mass forbidden by a discrete symmetry, and the TeV mass RH
neutrino is simultaneously a novel candidate for the cold dark matter. However,
we show that with a single RH neutrino it is not possible to generate two
mass-square differences as required by the oscillation data. We extend the
model by introducing one more TeV RH neutrino and show that it is possible to
satisfy the oscillation pattern within the modified model. After studying in
detail the constraints coming from the dark matter, lepton flavor violation and
the muon anomalous magnetic moment, and the neutrinoless double beta decay, we
explore the parameter space and derive predictions of the model. Finally, we
study the production and decay signatures of the TeV RH neutrinos at TeV $e^+
e^-/\mu^+ \mu^-$ colliders.


title: Dark Matter at Colliders: a Model-Independent Approach

abstract:
  Assuming that cosmological dark matter consists of weakly interacting massive
particles, we use the recent precise measurement of cosmological parameters to
predict the guaranteed rates of production of such particles in association
with photons at electron-positron colliders. Our approach is based on general
physical principles such as detailed balancing and soft/collinear
factorization. It leads to predictions that are valid across a broad range of
models containing WIMPs, including supersymmetry, universal extra dimensions,
and many others. We also discuss the discovery prospects for the predicted
experimental signatures.


title: New mechanism for the top-bottom mass hierarchy

abstract:
  We propose a mechanism to generate hierarchy between masses of the top and
bottom quarks without fine tuning of the Yukawa coupling constants in the
context of the two Higgs doublet model (THDM). In the THDM with a discrete
symmetry, there exists the vacuum where only the top quark receives the mass of
the order of the electroweak symmetry breaking scale $v(\simeq 246 GeV)$, while
the bottom quark remains massless. By introducing a small soft-breaking
parameter $m_3^2$ of the discrete symmetry, the bottom quark perturbatively
acquires a nonzero mass. We show a model in which the small $m_3^2 [\sim
v^2/(4\pi)^2]$ is generated by the dynamics above the cutoff scale of the THDM.
The ratio $\tan\beta$ of the two vacuum expectation values is necessarily very
large; i.e., $\tan \beta \sim m_t/m_b$. We also find a salient relation,
$1/\tan\beta \simeq m_3^2/m_H^2$, where $m_H$ is the mass of the extra CP-even
Higgs boson. Our scenario yields some specific features that can be tested in
future collider experiments.


title: Equalization of Response Functions of SK and SNO

abstract:
  We have studied the equalization of the response functions of the SK and SNO
for total event rate and event rate for the energy bins. To calculate the
response functions of SNO, we have used the latest theoretical values of the
cross section of the neutrino-deuteron CC process. By using these new
theoretical values, we find that the trigger threshold of the SK at which its
response function is equalized to the response function of SNO (at the trigger
threshold of 6.75 MeV), is 8.5 MeV. This value is 0.1 MeV smaller than the
value calculated using the old theoretical values of the cross section of
neutrino-deuteron process. The use of these new theoretical values also
produces a small change in the range of the energy bins where the response
functions are equalized.


title:
The effects of non-universal extra dimensions on the fermion electric
  dipole moments in the two Higgs doublet model

abstract:
  We study the the effects of non-universal extra dimensions on the electric
dipole moments of fermions in the two Higgs doublet model. We observe that the
t quark and b quark electric dipole moments are sensitive to the extra
dimensions, however, in the case of charged lepton electric dipole moments,
this sensitivity is relatively weak.


title:
Lepton Mixing Matrix Element U_{13} and New Assignments of Universal
  Texture for Quark and Lepton Mass Matrices

abstract:
  We reanalyze the mass matrix model of quarks and leptons that gives a unified
description of quark and lepton mass matrices with the same texture form. By
investigating possible types of assignment for the texture components of the
lepton mass matrix, we find that a different assignment for neutrinos than for
charged leptons can also lead to consistent values of the MNSP lepton mixing
matrix. We also find that the predicted value for the lepton mixing matrix
element $U_{13}$ of the model depends on the assignment. A proper assignment
will be discriminated by future experimental data for $U_{13}$.


title:
Photo-production of the pentaquark $\Theta^{+}$ with positive and
  negative parities

abstract:
  We investigate the production of the pentaquark $\Theta^+$ baryon via the
$\gamma n\to K^-\Theta^+$ and $\gamma p\to \bar{K}^0 \Theta^+$ processes,
focusing on the parity of the $\Theta^+$. Using the effective Lagrangians, we
calculate the total and differential cross sections with the spin of the
$\Theta^+$ presumed to be 1/2. We employ the coupling constant of the
$KN\Theta$ vertex determined by assuming its mass and the decay width to be
$1540 {\rm MeV}$ and $15 {\rm MeV}$. That of the $K^*N\Theta$ is taken to be
about a half of the $KN\Theta$ coupling constant. We estimate the cutoff
parameter by reproducing the total cross section of the $\gamma p \to K^+
\Lambda$ reaction. It turns out that the total cross section for the $\gamma
n\to K^- \Theta^+$ process is about four times larger than that of the $\gamma
p\to\bar{K}^0\Theta^+$. We also find that the cross sections for the production
of the positive-parity $\Theta$ are about ten times as large as those for the
negative-parity ones.


title: Ratio of $\bar{\Lambda}/\Lambda$ in Semi-inclusive Electroproduction

abstract:
  It is shown that the $\bar{\Lambda}/\Lambda$ cross section ratio in
semi-inclusive electroproduction of $\Lambda$ and $\bar{\Lambda}$ hyperons in
deep inelastic scattering of charged lepton on a nucleon target, can provide
useful information on the quark to $\Lambda$ fragmentation functions. This
ratio is calculated explicitly in a quark-diquark model, a pQCD based analysis,
and an SU(3) symmetry model, with three different options for the contribution
from the unfavored fragmentation functions. The $x$-dependence of this ratio is
sensitive to the ratio of unfavored fragmentation functions over favored
fragmentation functions, $D_{\bar{u}}^{\Lambda}(z)/D_{u}^{\Lambda}(z)$, whereas
the $z$-dependence is sensitive to the flavor structure of the fragmentation
functions, i.e., the ratio $D_u^{\Lambda}(z)/D_s^{\Lambda}(z)$. Future
measurements by the HERMES Collaboration at DESY can discriminate between
various cases.


title:
Constraints on Topological Defect Formation in First-order
  Superconducting Phase Transitions

abstract:
  In this work we address the impact of a cubic term addition to the
Ginzburg-Landau mean-field potential, and study the consequences on the
description of first order phase transitions in superconductors. Constraints
are obtained from experiment and used to assess consequences on topological
defect creation. No fundamental changes in either the Kibble-Zurek or
Hindmarsh-Rajantie predictions are found.


title:
Electroweak symmetry breaking and radion stabilization in universal
  extra dimensions

abstract:
  We discuss the stabilization of the scalar sector, including the radion, in
the gauge model with one universal extra dimension, within Higgs and Higgsless
scenarios. The stabilization occurs at the one-loop level, through the
fermionic contribution to the effective potential; in the Higgs case, for
stabilization to take place the bosonic contribution must be balanced by the
fermionic one, hence the scales of these two cannot differ too much. However,
there is no need for (softly broken) supersymmetry to achieve the stabilization
- it can be arranged for a reasonably wide range of couplings and mass scales.
The primary instability in the model is the run-away of the radion vacuum
expectation value. It turns out that the requirement of the radion stability,
in the Higgs case, favours a Higgs boson mass below 0.26 TeV, which is
consistent with the Standard Model upper bound that follows from the
electroweak precision measurements. The typical radion mass is of the order of
10^{-6} eV. The radion mass can be made larger by rising the scale of fermion
masses, as clearly seen in the Higgsless case. The cosmological constant may be
cancelled by suitable counterterms, in such a way that the stabilization is not
affected.


title: Neutrino inflation of baryon inhomogeneities in strong magnetic fields

abstract:
  Baryon inhomogeneitites formed in the early universe are important as they
affect the nucleosynthesis calculations. Since they are formed much before the
nucleosynthesis epoch, neutrino inflation plays a crucial role in damping out
these fluctuations. Now neutrinos, in turn, are affected by magnetic fields
which may be present in the early universe. In this work we study the evolution
of baryonic inhomogeneities due to neutrino induced dissipative processes in
the presence of a background magnetic field. We find that at higher
temperatures the dissipation of the inhomogeneities are enhanced as the
magnetic field increases. Our study also shows that at lower temperatures the
same magnetic field may produce less dissipation. Though we limit our study to
temperatures below the quark-hadron transition we do establish that magnetic
fields present in the early universe affect the dissipation of baryonic
inhomogeneities.


title: Dynamical CP Violation in the Early Universe

abstract:
  Following earlier ideas of Dolgov, we show that the asymmetrical dynamical
evolution of fields in the early Universe provides a new source for CP
violation. This can lead to baryogenesis without any additional CP-violating
interactions. The magnitude of this CP violation is time-dependent. In
particular, it vanishes (or is very small) in the late Universe after the
fields have relaxed (or are in their final approach) to their vacuum values. We
provide an explicit example in which our mechanism is realized.


title: Physics Opportunities with a TeV Linear Collider

abstract:
  We discuss the physics motivations for building a 500 - 1 TeV
electron-positron linear collider. The state of the art collider technologies
and the physics-driven machine parameters are discussed. A survey of some of
the phenomena well suited to study at a linear collider are described,
including Higgs bosons, supersymmetry, other extensions to the Standard Model,
and cosmology.


title: Non-Factorizable Phases, Yukawa Textures and the Size of sin (2 beta)

abstract:
  We emphasize the crucial r\^ ole played by non-factorizable phases in the
analysis of the Yukawa flavour structure performed in weak bases with Hermitian
mass matrices and with vanishing $(1,1)$ entries. We show that non-factorizable
phases are important in order to generate a sufficiently large $\sin 2 \beta $.
A method is suggested to reconstruct the flavour structure of Yukawa couplings
from input experimental data both in this Hermitian basis and in a
non-Hermitian basis with a maximal number of texture zeros. The corresponding
Froggatt--Nielsen patterns are presented in both cases.


title: Anomaly-matching and Higgs-less effective theories

abstract:
  We reconsider the low-energy effective theory for Higgs-less electroweak
symmetry breaking: we study the anomaly-matching in the situation where all
Goldstone fields disappear from the spectrum as a result of the Higgs
mechanism. We find that the global SU(2)_L x SU(2)_R x U(1)_{B-L} symmetry of
the underlying theory, which is spontaneously broken to SU(2)_{L+R} x
U(1)_{B-L} has to be anomaly-free. For the sake of generality, we include the
possibility of light spin-1/2 bound states resulting from the dynamics of the
strongly-interacting symmetry-breaking sector, in addition to the Goldstone
bosons. Such composite fermions may have non-standard couplings at the leading
order, and an arbitrary total B-L charge. In order to perform the
anomaly-matching in that case, we generalize the construction of the
Wess-Zumino effective lagrangian. Composite fermions beyond the three known
generations are theoretically allowed, and there are no restrictions from the
anomaly-matching on their couplings nor on their U(1)_{B-L} charge. Absence of
global anomalies for the composite sector as a whole does not preclude
anomalous triple gauge boson couplings arising from composite fermion
triangular diagrams. On the other hand, the trace of B-L over elementary
fermions must vanish if all Goldstone modes are to disappear from the spectrum.


title:
Data Acquisition and Analysis of the 76Ge Double Beta Experiment in Gran
  Sasso 1990-2003

abstract:
  Data acquisition in a long running underground experiment has its specific
experimental challenges, concerning data acquisition, stability of the
experiment and background reduction. These problems are addressed here for the
HEIDELBERG-MOSCOW experiment, which collected data in the period August 1990 -
May 2003. The measurement and the analysis of the data is presented. The duty
cycle of the experiment was ~80%, the collected statistics is 71.7 kgy. The
background achieved in the energy region of the Q value for double beta decay
is 0.11 events/kg y keV. The two-neutrino accompanied half-life is determined
on the basis of more than 100 000 events. The confidence level for the
neutrinoless signal has been improved to a 4 sigma level.


title: Gravitational Baryogenesis

abstract:
  We show that a gravitational interaction between the derivative of the Ricci
scalar curvature and the baryon-number current dynamically breaks CPT in an
expanding universe and, combined with baryon-number-violating interactions, can
drive the universe towards an equilibrium baryon asymmetry that is
observationally acceptable.


title:
Study of $ Theta^+(udud \bar s) $ in lattice QCD with exact chiral
  symmetry

abstract:
  We investigate the mass spectrum of the pentaquark baryon ($ udud \bar s $)
in quenched lattice QCD with exact chiral symmetry. Using 3 different
interpolating operators for $ \Theta $, we measure the $ 3 \times 3 $
correlation matrix and obtain the eigenvalues $ A^{\pm} (t) $ with $ \pm $
parity, for 100 gauge configurations generated with Wilson gauge action at $
\beta = 6.1 $ on the $ 20^3 \times 40 $ lattice. For the lowest-lying $ J^P =
1/2^- $ state, its mass is almost identical to that of the KN S-wave, while for
the lowest-lying $ J^P = 1/2^+ $ state, its mass is smaller than that of the KN
P-wave, especially for the regime $ m_u < m_s $. By chiral extrapolation
(linear in $m_\pi^2$) to $ m_\pi = 135 $ MeV, we obtain the masses of the
lowest-lying states: $ m(1/2^-) = 1424(57) $ MeV and $ m(1/2^+) = 1562(121) $
MeV, in agreement with the masses of $ m_K + m_N \simeq 1430 $ MeV and $
\Theta^+(1540) $ respectively.


title: Energy dependence of gap survival probability and antishadowing

abstract:
  We discuss energy dependence of gap survival probability which follows from
rational form of amplitude unitarization. In contrast to eikonal form of
unitarization which leads to decreasing energy dependence of gap survival
probability, we predict a non-monotonous form for this dependence.


title:
Microscopic description of anisotropic flow in relativistic heavy ion
  collisions

abstract:
  Anisotropic flow of hadrons is studied in heavy ion collisions at SPS and
RHIC energies within the microscopic quark-gluon string model. The model was
found to reproduce correctly many of the flow features, e.g., the wiggle
structure of direct flow of nucleons at midrapidity, or centrality, rapidity,
and transverse momentum dependences of elliptic flow. Further predictions are
made. The differences in the development of the anisotropic flow components are
linked to the freeze-out conditions, which are quite different for baryons and
mesons.


title: QCD Resummation Techniques

abstract:
  In this thesis, we develop resummation algorithms suitable for perturbative
QCD. In the first part, we propose a resummation technique applicable to the
Regge limit. We develop a new systematic procedure for this limit in
perturbative QCD to arbitrary logarithmic order. The formalism relies on the IR
structure and the gauge symmetry of the theory. Using a factorization procedure
introduced by Sen, we derive a sum of convolutions in transverse momentum space
over soft and jet functions, which approximate the amplitude up to
power-suppressed corrections. A set of evolution equations generalizing the
BFKL equation and controlling the high energy behavior of the amplitudes to
arbitrary logarithmic accuracy is derived. The general method is illustrated in
the case of leading and next-to-leading logarithmic gluon reggeization and BFKL
equation. We confirm the standard results at LL accuracy. At NLL order, we find
an agreement with the reggeization conjecture up to two loops. However,
starting at three loop order, we identify contributions violating the Regge
ansatz. In addition, we calculate the evolution kernel determining the
high-energy behavior of the non-reggeized term in the scattering amplitude. In
the second part, we focus our attention to another intriguing problem of
high-energy QCD, the resummation associated with soft radiation in dijet events
which is complicated by the presence of non-global logarithms. We introduce a
set of correlations between energy flow and event shapes that are sensitive to
the flow of color at short distances in jet events. The method is illustrated
for electron-positron dijet events. We calculate the correlation at leading
logarithm in the energy flow and at next-to-leading-logarithm in the event
shape.


title: Whitening of the Quark-Gluon Plasma

abstract:
  Parton-parton collisions do not neutralize local color charges in the
quark-gluon plasma as they only redistribute the charges among momentum modes.
We discuss color diffusion and color conductivity as the processes responsible
for the neutralization of the plasma. For this purpose, we first compute the
conductivity and diffusion coefficients in the plasma that is significantly
colorful. Then, the time evolution of the color density due to the conductivity
and diffusion is studied. The conductivity is shown to be much more efficient
than the diffusion in neutralizing the plasma at the scale longer than the
screening length. Estimates of the characteristic time scales, which are based
on close to global equilibrium computations, suggest that first the plasma
becomes white and then the momentum degrees of freedom thermalize.


title: Does HBT Measure the Freeze-out Source Distribution?

abstract:
  It is generally assumed that as a result of multiple scattering, the source
distribution measured in HBT interferometry corresponds to a chaotic source at
freeze-out. This assumption is subject to question as effects of multiple
scattering in HBT measurements must be investigated within a quantum-mechanical
framework. Applying the Glauber multiple scattering theory at high energies and
the optical model at lower energies, we find that multiple scattering leads to
an effective HBT density distribution that depends on the initial chaotic
source distribution with an absorption.


title: Pole- versus MS-mass definitions in the electroweak theory

abstract:
  Two different two-loop relations between the pole- and the MS-mass of the top
quark have been derived in the literature which were based on different
treatments of the tadpole diagrams. In addition, the limit M_W^2/m_t^2 \to 0
was employed in one of the calculations. It is shown that, after appropriate
transformations, the results of the two calculations are in perfect agreement.
Furthermore we demonstrate that the inclusion of the non-vanishing mass of the
W-boson leads to small modifications only.


title:
Occam's Higgs: A Phenomenological Solution to the Electroweak Hierarchy
  Problem

abstract:
  We propose a phenomenological solution to the Electroweak hierarchy problem.
It predicts no new particles beyond those in the Standard Model. The Higgs is
arbitrarily massive and slow-roll inflation can be implemented naturally. Loop
corrections will be negligible even for large cutoffs.


title: Some (further) Comments on the Theta(1540) Pentaquark

abstract:
  Additional broader I=0 states in the KN channel near $\Theta^+$(1540) are
expected in many models, making the absence of any signature in the
K$^+$-deuteron scattering data even more puzzling.
  In an ideal "three-body" picture the $\Theta$ is viewed as two compact
ud(1)ud(2) $\bar{3}$ color diquarks and an $\bar{s}$ quark. A "QCD-type"
inequality involving $m(\Theta^+), m(\Lambda)$, the mass of the $\Lambda(1/2^-)
$ L=1 excitation and that of a new I=0 tetraquark vector meson then follows.
The inequality suggests a very light new vector meson, and is violated.
  We note that "associated production" of the pentaquark with another
quadriquark or anti-pentaquark may be favored. This along with some estimates
of the actual production cross sections suggest that the $\Theta$ can be found
in BaBar or Belle e$^+$-e$^-$ colliders.


title: Magnetic moments of antidecuplet pentaquarks

abstract:
  We analyze the magnetic moment of the exotic pentaquarks of the flavor
antidecuplet in the constituent quark model for the case in which the ground
state is in an orbital L(p)=0(+) or a L(p)=1(-) state. We derive sum rules for
the magnetic moments. The magnetic moment of the Theta(1540) is found to be
0.38, 0.09 and 1.05 mu_N for J(p)=1/2(-), 1/2(+) and 3/2(+), respectively,
which is compared with the results obtained in other approaches.


title: Hunting for CP violation with untagged charm decays

abstract:
  We construct a CP-violating observable which does not require flavor or CP
tagging of the initial state. The proposed decay asymmetry could be measured at
both threshold and non-threshold charm physics experiments and provide better
sensitivity to small CP-violating parameters in charm decays.


title: Standard Model CP violation in B->X_d \ell^+\ell^- decays

abstract:
  We investigate the CP violating asymmetry, the forward backward asymmetry and
the CP violating asymmetry in the forward-backward asymmetry for the inclusive
B->X_d \ell^+\ell^- decays for the \ell=e,\mu \tau channels in the standard
model. It is observed that these asymmetries are quite sizable and B->X_d
\ell^+\ell^- decays seem promising for investigating CP violation.


title: Light Scalar Mesons in the Improved Ladder QCD

abstract:
  The light scalar meson spectrum is studied using the improved ladder QCD with
the UA(1) breaking Kobayashi-Maskawa-'t Hooft interaction by solving the
Schwinger-Dyson and Bethe-Salpeter equations. The dynamically generated
momentum-dependent quark mass is large enough in the low momentum region to
give rise to the spontaneous breaking of chiral symmetry. Due to the large
dynamical quark mass, the scalar mesons become the q bar{q} bound states. Since
the parameters have been all fixed to reproduce the light pseudoscalar meson
masses and the decay constant, there is no free parameter in the calculation of
the scalar mesons. We obtain $M_{sigma} = 667$ MeV, $M_{a_0} = 942$ MeV and
$M_{f_0} = 1336$ MeV. They are in good agreement with the observed masses of
$sigma(600)$, $a_0(980)$ and $f_0(1370)$, respectively. We therefore conclude
that these states are the members of the light scalar meson nonet. The mass of
$K_0^{*}$ is obtained between that of $a_0$ and $f_0$ and the corresponding
state is not observed experimentally. We also find that the strangeness content
in the $sigma$ meson is about 5%.


title: Vector mesons in nuclear mu-e conversion

abstract:
  We study nuclear mu-e conversion in the general framework of an effective
Lagrangian approach without referring to any specific realization of the
physics beyond the standard model (SM) responsible for lepton flavor violation
(LFV). We show that vector meson exchange between lepton and nucleon currents
plays an important role in this process. A new issue of this mechanism is the
presence of the strange quark vector current contribution induced by the phi
meson. This allows us to extract new limits on the LFV lepton-quark effective
couplings from the existing experimental data.


title: Radiative B decays to the axial $K$ mesons at next-to-leading order

abstract:
  We calculate the branching ratios of $B\to K_1\gamma$ at next-to-leading
order (NLO) of $\alpha_s$ where $K_1$ is the orbitally excited axial vector
meson. The NLO decay amplitude is divided into the vertex correction and the
hard spectator interaction part. The one is proportional to the weak form
factor of $B\to K_1$ transition while the other is a convolution between
light-cone distribution amplitudes and hard scattering kernel. Using the
light-cone sum rule results for the form factor, we have $\calB(B^0\to
K_1^0(1270)\gamma)=(0.828\pm0.335)\times 10^{-5}$ and $\calB(B^0\to
K_1^0(1400)\gamma)=(0.393\pm0.151)\times 10^{-5}$.


title: Top quark pair production and decay at hadron colliders

abstract:
  In ongoing and upcoming hadron collider experiments, top quark physics will
play an important role in testing the Standard Model and its possible
extensions. In this work we present analytic results for the differential cross
sections of top quark pair production in hadronic collisions at next-to-leading
order in the QCD coupling, keeping the full dependence on the spins of the top
quarks. These results are combined with the corresponding next-to-leading order
results for the decay of polarized top quarks into dilepton, lepton plus jets,
and all jets final states. As an application we predict double differential
angular distributions which are due to the QCD-induced top quark spin
correlations in the intermediate state. In addition to the analytic results, we
give numerical results in terms of fit functions that can easily be used in an
experimental analysis.


title:
Unbinned test of time-dependent signals in real-time neutrino
  oscillation experiments

abstract:
  Real-time neutrino oscillation experiments such as Super-Kamiokande (SK), the
Sudbury Neutrino Observatory (SNO), the Kamioka Liquid scintillator
Anti-Neutrino Detector (KamLAND), and Borexino, can detect time variations of
the neutrino signal, provided that the statistics is sufficiently high. We
quantify this statement by means of a simple unbinned test, whose sensitivity
depends on the variance of the signal in the time domain, as well as on the
total number of signal and background events. The test allows a unified
discussion of the statistical uncertainties affecting current or future
measurements of eccentricity-induced variations and of day-night asymmetries
(in SK, SNO, and Borexino), as well as of reactor power variations (in
KamLAND).