title: Note on CKM Matrix Renormalization

abstract:
  A simple inspection of the one loop quark self-energy suggests a prescription
of the CKM matrix renormalization in the standard model. It leads to a CKM
matrix counterterm which is gauge parameter independent and satisfies the
unitarity constraint, and renormalized physical amplitudes which are gauge
parameter independent and smooth in quark mass difference. We make a point that
caution should be practiced when interpreting the CKM martix counterterm in
terms of those of parameters in a given representation due to rephasing effects
from renormalization. We show how this can be done using the degrees of freedom
in the on-shell renormalization scheme.


title: Double-transverse spin asymmetries at NLO

abstract:
  We report on a next-to-leading order QCD calculation of the cross section and
the spin asymmetry for isolated large-p_T prompt photon production in
collisions of transversely polarized protons. Corresponding measurements may be
used at RHIC to determine the transversity parton distributions of the proton.


title:
Direct and Indirect Detection of Neutralino Dark Matter In Selected
  Supersymmetry Breaking Scenarios

abstract:
  Various methods of searching for supersymmetric dark matter are sensitive to
WIMPs with different properties. One consequence of this is that the
phenomenology of dark matter detection can vary dramatically in different
supersymmetric breaking scenarios.
  In this paper, we consider the sensitivities to supersymmetric dark matter of
different detection methods and techniques in a wide variety of supersymmetric
breaking scenarios. We discuss the ability of various astrophysical
experiments, such as direct experiments, gamma-rays satellites, neutrino
telescopes and positron and anti-proton cosmic ray experiments, to test various
supersymmetry breaking scenarios. We also discuss what information can be
revealed about supersymmetry breaking by combining results from complementary
experiments. We place an emphasis on the differences between various
experimental techniques.


title:
Probing polarized strangeness in the proton: the use of heavy quarks and
  the renormalization group

abstract:
  Once heavy-quark corrections are take into account neutrino-proton elastic
scattering provides a complementary probe of polarized strangeness in the
nucleon to measurements from inclusive and semi-inclusive polarized deep
inelastic scattering. We review the different types of experiment and a recent
NLO calculation of heavy-quark contributions to the weak neutral-current
axial-charge (measureable in neutrino-proton elastic scattering) performed
using Witten's heavy-quark renormalization group method.


title:
Self-interacting dark matter and Higgs bosons in the SU(3)_C x SU(3)_L x
  U(1)_N model with right-handed neutrinos

abstract:
  We investigate the possibility that dark matter could be made from CP-even
and CP- odd Higgs bosons in the SU(3)_C X SU(3)_L X U(1)_N (3-3-1) model with
right-handed neutrinos. This self-interacting dark matters are stable without
imposing of new symmetry and should be weak-interacting.


title: The quadratic scalar radius of the pion and the mixed $\pi-K$ radius

abstract:
  We consider the quadratic scalar radius of the pion, $<r^2_{{\rm S},\pi}>$,
and the mixed $K-\pi$ scalar radius, $<r^2_{{\rm S},K\pi}>$. With respect to
the second, we point out that the more recent (post-1974) experimental results
in $K_{l3}$ decays imply a value, $<r^2_{{\rm S},K\pi}>=0.31\pm0.06 {\rm
fm}^2$, which is about $2 \sigma$ above estimates based on chiral perturbation
theory. On the other hand, we show that this value of $<r^2_{{\rm S},K\pi}>$
suggests the existence of a low mass S$\tfrac{1}{2}$ $K\pi$ resonance. With
respect to $<r^2_{{\rm S},\pi}>$, we contest the central value and accuracy of
current evaluations, that give $<r^2_{{\rm S},\pi}>=0.61\pm0.04 {\rm fm}^2$.
Based on experiment, we find a robust lower bound of $<r^2_{{\rm
S},\pi}>\geq0.70\pm0.06 {\rm fm}^2$ and a reliable estimate, $<r^2_{{\rm
S},\pi}>=0.75\pm0.07 {\rm fm}^2$, where the error bars are attainable. This
implies, in particular, that the chiral result for $<r^2_{{\rm S},\pi}>$ is
$1.4 \sigma$ away from experiment. We also comment on implications about the
chiral parameter $\bar{l}_4$, very likely substantially larger (and with larger
errors) than usually assumed.


title: The Cosmological Parameters

abstract:
  Pre-publication version withdrawn at the request of the journal. Final
version now available in Reviews of Particle Physics at
http://pdg.lbl.gov/2004/reviews/contents_sports.html


title:
Search for anomalous single production of the fourth SM family quark
  decaying into a light scalar

abstract:
  Superjet events observed by the CDF Collaboration are interpreted as
anomalous single production of the fourth SM family $u_4$ quark, decaying into
a new light scalar particle. The specific predictions of the proposed mechanism
are discussed.


title: Robust LHC Higgs Search in Weak Boson Fusion

abstract:
  We demonstrate that an LHC Higgs search in weak boson fusion production with
subsequent decay to weak boson pairs is robust against extensions of the
Standard Model or MSSM involving a large number of Higgs doublets. We also show
that the transverse mass distribution provides unambiguous discrimination of a
continuum Higgs signal from the Standard Model.


title: QCD Corrections to $\gamma\gamma\to ZZ$ at Small Scattering Angles

abstract:
  QCD corrections to the electroweak cross section of $\gamma\gamma\to ZZ$ at
high energies and small scattering angles have been calculated. The dominant
contributions are due to $t$-channel gluon exchange, i.e. photons dissociate
into quark-antiquark pairs giving rise to two colour dipoles which interact
through gluons. Corrections resulting from the leading log BFKL amplitude are
of the order of a few percent close to the forward region already at the 1 TeV
energy range and are rising with the scattering energy. We also considered the
helicity non-conserving cases in which the QCD corrections in comparison to the
electroweak part of the amplitude strongly grow with energy. The helicity
non-conserving scattering process is of particular interest since it is
sensitive to the Higgs sector.


title: Basics of the Color Glass Condensate

abstract:
  I review basic concepts of the effective theory for the color glass
condensate which describes the high-energy limit of QCD interactions.


title: Top quark production at the Tevatron at NNLO

abstract:
  We present results for top quark production at the Tevatron including
next-to-next-to-leading order (NNLO) soft-gluon corrections. We show the
stability of the cross section with respect to kinematics choice and scale when
the NNLO corrections are taken into account.


title: An open quantum system approach to the B-mesons system

abstract:
  In this talk we consider a non standard evolution for the neutral B-mesons
system, namely, an evolution in the open quantum systems framework. Such
approach is justified by the very high sensitivity of experiments studying
CP-violating phenomena in the B-mesons sector, very near to the one required to
test some possible scenarios induced by quantum gravity at the Planck scale,
whose effects at low energy can be described by a heat bath. We adopt a
phenomenological point of view, introducing six new parameters that fully
describe this kind of evolution without referring to a specific model for the
microscopic interaction. We outline the main differences between this approach
and the usual one in the description of evolution and decay of single mesons or
correlated pairs.


title:
Semi-inclusive decays Lambda_b -> X_c + D_s^* at O(alpha_s) including
  Lambda_b and D_s^* polarization effects

abstract:
  In the leading order of the (1/m_b)-expansion in HQET the dominant
contribution to the semi-inclusive decays of polarized Lambda_b baryons into
the charm-strangeness mesons D_s and D_s^* is given by the partonic process
b(up) -> c + (D_s^-, D_s^{*-}). Using standard values for the parameters of the
process one expects a rather large branching ratio of approx. 8% into these two
channels. In the factorization approximation the semi-inclusive decay of a
polarized Lambda_b is governed by three unpolarized and four polarized
structure functions for which we determine the nonperturbative O(1/m_b^2)
corrections and the O(alpha_s) radiative corrections. We find that the
perturbative and nonperturbative corrections amount to approx. 10% and approx.
3%, respectively. The seven structure functions can be measured through an
analysis of the joint decay distributions of the process involving the
polarization of the Lambda_b and the decays D_s^{*-} -> D_s^- + gamma and
D_s^{*-} -> D_s^- + pi^0 for which we provide explicit forms. We also provide
numerical results for the Cabibbo suppressed semi-inclusive decays Lambda_b ->
X_u + (D_s, D_s^*).


title: Importance of Higher Twist Corrections in Polarized DIS

abstract:
  The higher twist corrections $h^N(x)/Q^2$ to the spin dependent proton and
neutron $g_1$ structure functions are extracted from the world data on
$g_1(x,Q^2)$ in a model independent way and found to be non-negligible. Their
role in determining the polarized parton densities in the nucleon is discussed.
It is also considered how the results are influenced by the recent JLab and
HERMES/d inclusive DIS data.


title: Renormalization group equations for effective field theories

abstract:
  We derive the renormalization group equations for a generic nonrenormalizable
theory. We show that the equations allow one to derive the structure of the
leading divergences at any loop order in terms of one-loop diagrams only. In
chiral perturbation theory, e.g., this means that one can obtain the series of
leading chiral logs by calculating only one loop diagrams. We discuss also the
renormalization group equations for the subleading divergences, and the crucial
role of counterterms that vanish at the equations of motion. Finally, we show
that the renormalization group equations obtained here apply equally well also
to renormalizable theories.


title:
Maximal atmospheric neutrino mixing and the small ratio of muon to tau
  mass

abstract:
  We discuss the problem of the small ratio of muon mass to tau mass in a class
of seesaw models where maximal atmospheric neutrino mixing is enforced through
a $\mu$--$\tau$ interchange symmetry. We introduce into those models an
additional symmetry $T$ such that $m_\mu = 0$ in the case of exact $T$
invariance. The symmetry $T$ may be softly broken in the Higgs potential, and
one thus achieves $m_\mu \ll m_\tau$ in a technically natural way. We speculate
on a wider applicability of this mechanism.


title:
Longitudinally Polarized Photoproduction of Inclusive Hadrons Beyond the
  Leading Order

abstract:
  We present a complete next-to-leading order QCD calculation for
single-inclusive large-pT hadron production in longitudinally polarized
lepton-nucleon collisions, consistently including ``direct'' and ``resolved''
photon contributions. This process could be studied experimentally at a future
polarized lepton-proton collider like eRHIC at BNL. We examine the sensitivity
of such measurements to the so far completely unknown parton content of
circularly polarized photons.


title: Almost exponential transverse spectra from power law spectra

abstract:
  We point out that exponential shape of transverse spectra can be obtained as
the Fourier transform of the limiting distribution of randomly positioned
partons with power law spectra given by pQCD, which actually realize Tsallis
distributions. Such spectra were used to obtain hadron yields by recombination
in relativistic heavy-ion collisions at RHIC energies.


title: The phenomenology of rare and semileptonic B decays

abstract:
  We summarize recent progress in the theory of exclusive rare and semileptonic
B decays, focusing on model-independent results. The heavy-to-light form
factors parameterizing these decays admit a model-independent description in
two distinct kinematical regions. In the large-energy limit of an energetic
light meson, the Soft-Collinear Effective Theory can be used to prove
factorization formulas for the form factors. We present factorization formulas
for all B-> P,V form factors at leading order in Lambda/m_b. Near the
zero-recoil point, Heavy Quark Effective Theory gives useful relations among
the form factors of different currents.


title:
Hawking Radiation from a (4+n)-dimensional Black Hole: Exact Results for
  the Schwarzschild Phase

abstract:
  We start our analysis by deriving a master equation that describes the motion
of a field with arbitrary spin $s$ on a 3-brane embedded in a non-rotating,
uncharged (4+n)-dimensional black hole background. By numerical analysis, we
derive exact results for the greybody factors and emission rates for scalars,
fermions and gauge bosons emitted directly on the brane, for all energy regimes
and for an arbitrary number $n$ of extra dimensions. The relative emissivities
on the brane for different types of particles are computed and their dependence
on the dimensionality of spacetime is demonstrated -- we therefore conclude
that both the amount and the type of radiation emitted can be used for the
determination of $n$ if the Hawking radiation from these black holes is
observed. The emission of scalar modes in the bulk from the same black holes is
also studied and the relative bulk-to-brane energy emissivity is accurately
computed. We demonstrate that this quantity varies considerably with $n$ but
always remains smaller than unity -- this provides firm support to earlier
arguments made by Emparan, Horowitz and Myers.


title: On the Chiral Phase Transition in the Linear Sigma Model

abstract:
  The Cornwall-Jackiw-Tomboulis (CJT) effective action for composite operators
at finite temperature is used to investigate the chiral phase transition within
the framework of the linear sigma model as the low-energy effective model of
quantum chromodynamics (QCD). A new renormalization prescription for the CJT
effective action in the Hartree-Fock (HF) approximation is proposed. A
numerical study, which incorporates both thermal and quantum effect, shows that
in this approximation the phase transition is of first order. However, taking
into account the higher-loop diagrams contribution the order of phase
transition is unchanged.


title: Three-loop results and soft-gluon effects in DIS

abstract:
  We have calculated the fermionic contributions to the flavour non-singlet
structure functions in deep-inelastic scattering (DIS) at third order of
massless perturbative QCD. We discuss their implications for the threshold
resummation at the next-to-next-to-leading logarithmic accuracy.


title: Coherent Phase Argument for Inflation

abstract:
  Cosmologists have developed a phenomenally successful picture of structure in
the universe based on the idea that the universe expanded exponentially in its
earliest moments. There are three pieces of evidence for this exponential
expansion -- {\it inflation} -- from observations of anisotropies in the cosmic
microwave background. First, the shape of the primordial spectrum is very
similar to that predicted by generic inflation models. Second, the angular
scale at which the first acoustic peak appears is consistent with the flat
universe predicted by inflation. Here I describe the third piece of evidence,
perhaps the most convincing of all: the phase coherence needed to account for
the clear peak/trough structure observed by the WMAP satellite and its
predecessors. I also discuss alternatives to inflation that have been proposed
recently and explain how they produce coherent phases.


title:
Discrete symmetries, invisible axion and lepton number symmetry in an
  economic 3-3-1 model

abstract:
  We show that Peccei-Quinn and lepton number symmetries can be a natural
outcome in a 3-3-1 model with right-handed neutrinos after imposing a Z_11 x
Z_2 symmetry. This symmetry is suitably accommodated in this model when we
augmented its spectrum by including merely one singlet scalar field. We work
out the breaking of the Peccei-Quinn symmetry, yielding the axion, and study
the phenomenological consequences. The main result of this work is that the
solution to the strong CP problem can be implemented in a natural way, implying
an invisible axion phenomenologically unconstrained, free of domain wall
formation and constituting a good candidate for the cold dark matter.


title: Relation between color-deconfinement and chiral restoration

abstract:
  We discuss the relation between the Polyakov loop and the chiral order
parameter at finite temperature by using an effective model. We clarify why and
how the pseudo-critical temperature associated with the Polyakov loop should
coincide with that of the chiral condensate.


title:
A comprehensive study of neutrino spin-flavour conversion in supernovae
  and the neutrino mass hierarchy

abstract:
  Resonant spin-flavour (RSF) conversions of supernova neutrinos, which is
induced by the interaction between the nonzero neutrino magnetic moment and
supernova magnetic fields, are studied for both normal and inverted mass
hierarchy. As the case for the pure matter-induced neutrino oscillation
(Mikheyev--Smirnov--Wolfenstein (MSW) effect), we find that the RSF transitions
are strongly dependent on the neutrino mass hierarchy as well as the value of
$\theta_{13}$. Flavour conversions are solved numerically for various neutrino
parameter sets, with presupernova profile calculated by Woosley and Weaver. In
particular, it is very interesting that the RSF-induced
$\nu_\rme\to\bar\nu_\rme$ transition occurs, if the following conditions are
all satisfied: the value of $\mu_\nu B$ ($\mu_\nu$ is the neutrino magnetic
moment, and $B$ is the magnetic field strength) is sufficiently strong, the
neutrino mass hierarchy is inverted, and the value of $\theta_{13}$ is large
enough to induce adiabatic MSW resonance. In this case, the strong peak due to
original $\nu_\rme$ emitted from neutronization burst would exist in time
profile of the neutrino events detected at the Super-Kamiokande detector. If
this peak were observed in reality, it would provide fruitful information on
the neutrino properties. On the other hand, characters of the neutrino spectra
are also different between the neutrino models, but we find that there remains
degeneracy among several models. Dependence on presupernova models is also
discussed.


title: Obtaining the Full Unitarity Triangle from B -> pi K Decays

abstract:
  We present a method of obtaining the entire unitarity triangle from
measurements of B -> pi K decay rates alone. Electroweak penguin amplitudes are
included, and are related to tree operators. Discrete ambiguities are removed
by comparing solutions with independent experimental data. The theoretical
uncertainty in this method is rather small, in the range 5--10%.


title:
Searching for dominant rescattering sources in B to two pseudoscalar
  decays

abstract:
  Various rescattering sources are analyzed in the context of the SU(3) flavor
symmetry. In particular, the possibility to account for intermediate charm at
the hadronic level in B to PP is thoroughly investigated. Then, the
rescattering sources are compared in light of recent B to two charmless
pseudoscalar decay measurements, with emphasis on the size of strong phases and
on patterns of direct CP-asymmetries.


title:
A new window on Strange Quark Matter as the ground state of strongly
  interacting matter

abstract:
  If strange quark matter is the true ground state of matter, it must have
lower energy than nuclear matter. Simultaneously, two-flavour quark matter must
have higher energy than nuclear matter, for otherwise the latter would convert
to the former. We show, using an effective chiral lagrangian, that the
existence of a new lower energy ground state for two-flavour quark matter, the
pion condensate, shrinks the window for strange quark matter to be the ground
state of matter and sets new limits on the current strange quark mass.


title: Thermal Leptogenesis and Gauge Mediation

abstract:
  We show that a mini-thermal inflation occurs naturally in a class of gauge
mediation models of supersymmetry (SUSY) breaking, provided that the reheating
temperature T_R of the primary inflation is much higher than the SUSY-breaking
scale, say T_R > 10^{10} GeV. The reheating process of the thermal inflation
produces an amount of entropy, which dilutes the number density of relic
gravitinos. This dilution renders the gravitino to be the dark matter in the
present universe. The abundance of the gravitinos is independent of the
reheating temperature T_R, once the gravtinos are thermally produced after the
reheating of the primary inflation. We find that the thermal leptogenesis takes
place at T_L\simeq 10^{12-14} GeV for m_{3/2}\simeq 100 keV - 10 MeV without
any gravitino problem.


title: DVCS on nuclei: Observability and Consequences

abstract:
  In this paper, we discuss the feasibility of measuring deeply virtual Compton
scattering (DVCS) on nuclei in a collider setting, as for example, the planned
high-luminosity Electron-Ion-Collider (EIC). We demonstrate that employing our
recent model for nuclear generalized parton distributions (nGPDs), the
one-photon unpolarized DVCS cross section as well as the azimuthal- and spin
asymmetry are of the same size as in the proton case. This will allow for an
experimental extraction of nuclear GPDs with high precision shedding new light
on nuclear shadowing at small $x_{bj}$ and the interplay of shadowing and
nuclear enhancement at $x_{bj}~0.1$.


title:
Color Ferromagnetism of Quark Matter and Quantum Hall States of Gluons
  in SU(3) Gauge Theory

abstract:
  We show a possibility that a color ferromagnetic state exists in SU(3) gauge
theory of quark matter with two flavors. Although the state involves three
types of unstable modes of gluons, all of these modes are stabilized by forming
a quantum Hall state of one of the modes. We also show that at large chemical
potential, a color superconducting state (2SC) appears even in the
ferromagnetic state. This is because Meissner effect by condensed anti-triplet
quark pairs does not work on the magnetic field in the ferromagnetic state.


title: Heavy Triplets: Electric Dipole Moments vs Proton Decay

abstract:
  The experimental limit on the electron electric dipole moment constraints the
pattern of supersymmetric grand-unified theories with right-handed neutrinos.
We show that such contraints are already competing with the well known ones
derived by the limit on proton lifetime.


title: KamLAND and Solar Antineutrino Spectrum

abstract:
  We use the recent KamLAND observations to predict the solar antineutrino
spectrum at some confidence limits. We find that a scaling of the antineutrino
probability with respect to the magnetic field profile --in the sense that the
same probability function can be reproduced by any profile with a suitable peak
field value-- can be utilised to obtain a general shape of the solar
antineutrino spectrum. This scaling and the upper bound on the solar
antineutrino event rate, that can be derived from the data, lead to: 1) an
upper bound on the solar antineutrino flux, 2) the prediction of their energy
spectrum, as the normalisation of the spectrum can be obtained from the total
number of antineutrino events recorded in the experiment. We get
$\phi_{\bar\nu}<3.8\times 10^{-3}\phi(^8B)$ or $\phi_{\bar\nu} <5.5\times
10^{-3}\phi(^8B)$ at 95% CL, assuming Gaussian or Poissonian statistics,
respectively. And for 90% CL these become $\phi_{\bar\nu}<3.4 \times
10^{-3}\phi(^8B)$ and $\phi_{\bar\nu}<4.9\times 10^{-3}\phi(^8B)$. It shows an
improvement by a factor of 3-5 with respect to existing bounds. These limits
are quite general and independent of the detailed structure of the magnetic
field in the solar interior.


title:
Using and Constraining Nonforward Parton Distributions (Deeply Virtual
  Neutrino Scattering in Cosmic Rays and Light Dark Matter Searches)

abstract:
  We overview the construction of Nonforward Parton Distributions (NPD) in
Deeply Virtual Compton Scattering (DVCS). Then we turn to the analysis of
similar constructs in the weak sector (electroweak NPD's). We argue in favour
of a possible use of electroweak DVCS (EWDVCS) as a rare process for the study
of neutrinos in cosmic rays and for light dark matter detection in underground
experiments


title:
Diffraction, exclusive processes, and proton structure in three
  dimensions

abstract:
  I briefly review how a three-dimensional picture of parton dynamics is
rendered in the impact parameter representation, applied to generalized parton
distributions and to the dipole picture of high-energy scattering.


title:
Signatures of the handbag mechanism in wide-angle photoproduction of
  pseudoscalar mesons

abstract:
  Wide-angle photoproduction of pseudoscalar mesons is investigated under the
assumption of dominance of the handbag mechanism considering both quark
helicity flip and non-flip. The partonic subprocess, meson photoproduction off
quarks, is analysed with the help of a covariant decomposition of the
subprocess amplitudes which is independent of a specific meson generation
mechanism. As examples of subprocess dynamics, however, the twist-2 as well as
two-particle twist-3 contributions are explicitly calculated. Characteristic
features of the handbag approach are discussed in dependence upon the relative
magnitudes of the invariant functions. Differential cross sections and spin
correlations are predicted to show a characteristic behaviour which allows to
test the underlying assumption of handbag dominance.


title:
Sivers Asymmetry and Generalized Parton Distributions in Impact
  Parameter Space

abstract:
  Recently, it has been pointed out that there exists a connection between the
generalized parton distribution $E(x,0,t)$ and the Sivers asymmetry. For
transversely polarized nucleon targets, generalized parton distributions are
asymmetric in impact parameter space. This impact parameter space asymmetry,
together with the final state interaction of the active quark, gives rise to
the Sivers asymmetry in momentum space. We demonstrate this phenomenon
explicitly in the scalar diquark model. This result also illustrates the
physics that underlies the correlation between the anomalous magnetic moment
and the Sivers asymmetry for a given quark flavor.


title: Next to leading order evolution of SIDIS processes in the forward region

abstract:
  We compute the order $\alpha_s^2$ quark initiated corrections to
semi-inclusive deep inelastic scattering extending the approach developed
recently for the gluon contributions. With these corrections we complete the
order $\alpha_s^2$ QCD description of these processes, verifying explicitly the
factorization of collinear singularities. We also obtain the corresponding NLO
evolution kernels, relevant for the scale dependence of fracture functions. We
compare the non-homogeneous evolution effects driven by these kernels with
those obtained at leading order accuracy and discuss their phenomenological
implications.


title: Jets, Flow, Gaps: Non-Global Effects

abstract:
  I discuss non-global observables in jet physics which contain single
logarithmic contributions of non standard type (non-global logs)


title: Fine Structure Constant in the Slope of Regge Trajectories

abstract:
  Recent research has indicated that meson and baryon Regge trajectories are
nonlinear and that all current models are ruled out by data. Tang and Norbury
have identified a number of properties for Regge trajectories: a test zone for
linearity, divergence, parallelism and intersecting lines. Likewise, Inopin has
reconstructed Regge trajectories for mesons and baryons, indicating that a
majority of trajectories is grossly nonlinear. In most of the models for Regge
trajectories, there is no indication that researchers have studied particle
binding energies to explain the deviation of experimental data from theory. In
terms of quark models, Mac Gregor has studied binding energies in the
constituent quark (CQ) model, and we shall turn to this model for help in
explaining the slope of meson Regge trajectories. PACS number(s): 12.40.Nn,
12.39.-x


title: Textures and hierarchies in quark mass matrices with four texture-zeros

abstract:
  A systematic analysis on the phenomenologically allowed textures in Hermitian
quark mass matrices with four texture-zeros is presented. The current data
allow a full determination of the mass matrix elements, provided that the
actual number of the parameters in the matrices is less than or equal to ten.
Besides the standard texture with zeros located in (1,1) and (1,3) positions,
we find four new type of parallel mass matrices. All of them are found to have
similar hierarchical structures: three of the nonzero matrix elements are at
the same order of magnitude with a small geometric hierarchy, while the
remaining one is relatively much smaller. These textures show a possibility
that a realistic quark mass matrix may have an approximate flavor
$S(2)_{L}\otimes S(2)_{R}$ symmetry, i.e. a partial flavor democracy. The
absolute values of the CP violating phases in the matrix elements are found to
be either close to their maximum ($\approx 90^\circ$) or very small ($\leq
10^{\circ}$). We also find twenty-six quasi-parallel and seventeen non-parallel
textures allowed by the experimental data.


title: Analytic properties of the Landau gauge gluon and quark propagators

abstract:
  We explore the analytic structure of the gluon and quark propagators of
Landau gauge QCD from numerical solutions of the coupled system of renormalized
Dyson--Schwinger equations and from fits to lattice data. We find sizable
negative norm contributions in the transverse gluon propagator indicating the
absence of the transverse gluon from the physical spectrum. A simple analytic
structure for the gluon propagator is proposed. For the quark propagator we
find evidence for a mass-like singularity on the real timelike momentum axis,
with a mass of 350 to 500 MeV. Within the employed Green's functions approach
we identify a crucial term in the quark-gluon vertex that leads to a positive
definite Schwinger function for the quark propagator.


title:
Analytic structure of the gluon and quark propagators in Landau gauge
  QCD

abstract:
  In Landau gauge QCD the infrared behavior of the propagator of transverse
gluons can be analytically determined to be a power law from Dyson-Schwinger
equations. This propagator clearly shows positivity violation, indicating the
absence of the transverse gluons from the physical spectrum, i.e. gluon
confinement. A simple analytic structure for the gluon propagator is proposed
capturing all important features. We provide arguments that the Landau gauge
quark propagator possesses a singularity on the real timelike axis. For this
propagator we find a positive definite Schwinger function.


title:
Constraints on Neutrino Parameters from Neutral-Current Solar Neutrino
  Measurements

abstract:
  We generalize the pull approach to define the $\chi^2$ function to the
analysis of the data with correlated statistical errors. We apply this method
to the analysis of the Sudbury Neutrino Collaboration data obtained in the
salt-phase. In the global analysis of all the solar neutrino and KamLAND data
we find the best fit (minimum $\chi^2$) values of neutrino parameters to be
$\tan^2 \theta_{12} \sim 0.42$ and $\delta m_{12}^2 \sim 7.1 \times 10^{-5}$
eV$^2$. We confirm that the maximal mixing is strongly disfavored while the
bounds on $\delta m_{12}^2$ are significantly strengthened.


title:
One-loop N-point equivalence among negative-dimensional, Mellin-Barnes
  and Feynman parametrization approaches to Feynman integrals

abstract:
  We show that at one-loop order, negative-dimensional, Mellin-Barnes' (MB) and
Feynman parametrization (FP) approaches to Feynman loop integrals calculations
are equivalent. Starting with a generating functional, for two and then for
$N$-point scalar integrals we show how to reobtain MB results, using
negative-dimensional and FP techniques. The $N-$point result is valid for
different masses, arbitrary exponents of propagators and dimension.


title: Recent Advances in Semileptonic B Decays

abstract:
  Aspects of the OPE-based QCD theory of B decays are discussed. We have at
least one nontrivial precision check of the OPE at the nonperturbative level in
inclusive decays. The data suggest proximity to the `BPS' limit for B mesons.
Its consequences are addressed and their accuracy qualified. It is suggested
that theory-wise B->D \ell\nu near zero recoil offers an accurate alternative
way to measure |V_{cb}|. It is shown that the OPE is in a good standing when
confronted by experiment. The alleged controversy between theory and data on
certain decay channels is found to be an artefact of oversimplifying the OPE in
presence of high experimental cuts severely degrading the effective hardness.
The effects exponential in the latter are missed in the traditionally used
expressions, yet they do not signify a breakdown of the 1/m_b expansion proper.
They typically increase the apparent b quark mass in B->X_s+\gamma by 70 MeV or
more, together with an even more dramatic downward shift in the kinetic
expectation value. The utility of the second moment of E_\gamma is emphasized
once the aforementioned effects have been included. Incorporating them brings
different measurements into a good agreement, provided the OPE-based theory
employs the robust approach.


title: Quest for Black Holes and Superstring Excitations in Cosmic Ray Data

abstract:
  In this talk we discuss aspects of TeV-scale gravitational collapse to black
holes and string balls and their subsequent evaporation. Special emphasis is
placed on the interplay of the string/black hole correspondence principle.
These ideas are then explored in the context of cosmic ray physics. First, the
potential for observing showers mediated by black holes or superstring
excitations is examined. Next, existing data from neutrino telescopes are used
to constrain the parameter space for the unseen dimensions of the universe.
Finally, we close with a discussion of future prospects.


title: The Coulomb interaction and the inverse Faddeev-Popov operator in QCD

abstract:
  We give a proof of a local relation between the inverse Faddeev-Popov
operator and the non-Abelian Coulomb interaction between color charges.


title: 2PI effective action and gauge invariance problems

abstract:
  The problem of maintaining gauge invariance when truncating the two particle
irreducible (2PI) effective action has been studied recently by several
authors. Here we give a simple and very general derivation of the gauge
dependence identities for the off-shell 2PI effective action. We consider the
case where the gauge is fixed by an arbitrary function of the quantum gauge
field, subject only to the restriction that the Faddeev-Popov matrix is
invertable. We also study the background field gauge. We address the role that
these identies play in solving gauge invariance problems associated with
physical quantities calculated using a truncated on-shell 2PI effective action.


title:
Probing Quark Distribution Amplitudes Through Generalized Parton
  Distributions at Large Momentum Transfer

abstract:
  In the large momentum transfer limit, generalized parton distributions can be
calculated through a QCD factorization theorem which involves
perturbatively-calculable hard kernels and light-cone parton distribution
amplitudes of hadrons. We illustrate this through the $H_q(x,\xi,t)$
distribution for the pion and proton, presenting the hard kernels at leading
order. As a result, experimental data on the generalized parton distributions
in this regime can be used to determine the functional form of the parton
distribution amplitudes which has thus far been quite challenging to obtain.
Our result can also be used as a constraint in phenomenological GPD
parametrizations.


title: Baryon Asymmetry, Dark Matter and Quantum Chromodynamics

abstract:
  We propose a novel scenario to explain the observed cosmological asymmetry
between matter and antimatter, based on nonperturbative QCD physics. This
scenario relies on a mechanism of separation of quarks and antiquarks in two
coexisting phases at the end of the cosmological QCD phase transition: ordinary
hadrons (and antihadrons), along with massive lumps (and antilumps) of novel
color superconducting phase. The latter would serve as the cosmological cold
dark matter. In certain conditions the separation of charge is C and CP
asymmetric and can leave a net excess of hadrons over antihadrons in the
conventional phase, even if the visible universe is globally baryon symmetric
$B = 0$. In this case an equal, but negative, overall baryon charge must be
hidden in the lumps of novel phase. Due to the small volume occupied by these
dense lumps/antilumps of color superconducting phase and the specific features
of their interaction with "normal" matter in hadronic phase, this scenario does
not contradict the current phenomenological constrains on presence of
antimatter in the visible universe. Moreover, in this scenario the observed
cosmological ratio $\Omega_{DM}\sim\Omega_{B}$ within an order of magnitude
finds a natural explanation, as both contributions to $\Omega$ originated from
the same physics during the QCD phase transition. The baryon to entropy ratio
$n_{B}/n_{\gamma}\sim 10^{-10}$ would also be a natural outcome, fixed by the
temperature $T_f \simlt T_{QCD}$ at which the separation of phases is
completed.

categories: hep-ph astro-ph cond-mat.supr-con nucl-th


title: Re/Os constraint on the time-variability of the fine-structure constant

abstract:
  We argue that the accuracy by which the isochron parameters of the decay
$^{187}{\rm Re}\to ^{187}{\rm Os}$ are determined by dating iron meteorites may
not directly constrain the possible time-dependence of the decay rate and hence
of the fine-structure constant $\alpha$. From this point of view, some of the
attempts to analyze the Oklo constraint and the results of the QSO absorption
lines are re-examined.


title:
Classification and dynamics of equivalence classes in SU(N) gauge theory
  on the orbifold $S^1/Z_2$

abstract:
  The dynamical determination of the boundary conditions in SU(N) gauge theory
on the orbifold $S^1/Z_2$ is investigated. We classify the equivalence classes
of the boundary conditions, and then the vacuum energy density of the theory in
each equivalence class is evaluated at one loop order. Unambiguous comparison
of the vacuum energy densities in the two theories in different equivalence
classes becomes possible in supersymmetric theories. It is found that in the
supersymmetric SU(5) models with the Scherk-Schwarz supersymmetry breaking, the
theory with the boundary conditions yielding the standard model symmetry is in
the equivalence class with the lowest energy density, though the low energy
theory is not identically the minimal supersymmetric standard model. We also
study how particular boundary conditions are chosen in the cosmological
evolution of the universe.


title:
The Kugo-Ojima confinement criterion and the Infrared Behavior of Landau
  gauge QCD

abstract:
  Recent investigations of the Dyson-Schwinger equations and Monte-Carlo
lattice calculations resulted in a coherent description of the fully dressed
gluon, ghost and quark propagators in Landau gauge QCD. In the Dyson-Schwinger
approach the infrared behaviour of these propagators is determined
analytically. For finite spacelike momenta the gluon, ghost and quark
propagators are compared to available corresponding results of lattice
Monte-Carlo calculations. For all three propagators an almost quantitative
agreement is found. These results for the non-perturbative propagators allow an
analytical verification of the Kugo-Ojima confinement criterion. Our numerical
analysis clearly reveals positivity violation for the gluon propagator
generated by a cut in the complex momentum plane. The non-perturbative strong
running coupling resulting from these propagators possesses an infrared fixed
point. The quark propagator obtained from quenched and unquenched calculations
displays dynamical chiral symmetry breaking with quark masses close to
``phenomenological'' and lattice values. We confirm that linear extrapolations
of the quark propagator for different bare masses to the chiral limit are
inaccurate.


title: Effective Actions for Strongly Interacting Fermionic Systems

abstract:
  We compare different non-perturbative methods for calculating the effective
action for fermionic systems featuring bosonic bound states (BBS) and
spontaneous symmetry breaking (SSB). In a purely fermionic language proceeding
into the SSB phase requires techniques beyond perturbation theory and
renormalization group equations. Improvement comes from a description with BBS
fields and elementary fields treated on equal footing. Yet, ``partial
bosonization'' introduces an arbitrariness as the choice for the composite
fields is usually not completely determined by the classical action. Results of
approximate calculations, e.g. mean field theory, may depend strongly on this
choice, thus limiting their quantitative reliability. Using the
Nambu--Jona-Lasinio model as an example we demonstrate how this dependence can
be reduced, sometimes even be eliminated by suitably chosen approximations.
  Schwinger-Dyson equations (SDE) allow for a description of SSB without
auxiliary fields. The 2PI effective action enables us to compare different
solutions of the SDE and find the stable one. We apply this method to a
six-fermion interaction resembling the three-flavor instanton interaction in
QCD. We find a first order chiral phase transition but no stable phase with
broken color symmetry.
  The existence of an elementary scalar boson in the Standard Model -- the
Higgs -- raises several questions. The smallness of its mass compared to some
fundamental scale ($\sim M_{\textrm{GUT}}$) requires an extreme amount of
fine-tuning. Moreover, its $\phi^4$-potential may not be renormalizable in a
strict sense. In view of this we discuss the possibility of a Higgs as BBS of
fermions.


title: Thermodynamics of the O(N) Nonlinear Sigma Model in 1+1 Dimensions

abstract:
  The thermodynamics of the O(N) nonlinear sigma model in 1+1 dimensions is
studied. We calculate the pressure to next-to-leading order in the 1/N
expansion and show that at this order, only the minimum of the effective
potential can be rendered finite by temperature-independent renormalization. To
obtain a finite effective potential away from the minimum requires an arbitrary
choice of prescription, which implies that the temperature dependence is
ambiguous. We show that the problem is linked to thermal infrared renormalons.


title: Can low-lying Roper states be explained as antidecuplet members?

abstract:
  It is shown that the anomalously low-lying Roper states cannot be assigned as
pentaquarks with the scalar diquark - scalar diquark - antiquark structure as
suggested by Jaffe and Wilczek.


title: Energy Loss of a Heavy Fermion in an Anisotropic QED Plasma

abstract:
  We compute the leading-order collisional energy loss of a heavy fermion
propagating in a QED plasma with an electron distribution function which is
anisotropic in momentum space. We show that in the presence of such
anisotropies there can be a significant directional dependence of the heavy
fermion energy loss with the effect being quite large for highly-relativistic
velocities. We also repeat the analysis of the isotropic case more carefully
and show that the final result depends on the intermediate scale used to
separate hard and soft contributions to the energy loss. We then show that the
canonical isotropic result is obtained in the weak-coupling limit. For
intermediate-coupling we use the residual scale dependence as a measure of our
theoretical uncertainty. We also discuss complications which could arise due to
the presence of unstable soft photonic modes and demonstrate that the
calculation of the energy loss is safe.


title: Resummed QCD Power Corrections to Nuclear Shadowing

abstract:
  We calculate and resum a perturbative expansion of nuclear enhanced power
corrections to the structure functions measured in deeply inelastic scattering
of leptons on a nuclear target. Our results for the Bjorken $x$-, $Q^2$- and
$A$-dependence of nuclear shadowing in $F_2^A(x,Q^2)$ and the nuclear
modifications to $F_L^A(x,Q^2)$, obtained in terms of the QCD factorization
approach, are consistent with the existing data. We demonstrate that the
low-$Q^2$ behavior of these data and the measured large longitudinal structure
function point to a critical role for the power corrections when compared to
other theoretical approaches.


title: Hard exclusive baryon-antibaryon production in 2-$\gamma$ collisions

abstract:
  We present a perturbative calculation of baryon pair production in two-photon
collisions, $\gamma \gamma \to B \bar{B}$, in which baryons are treated as
quark-diquark systems. Our approach accounts for constituent mass effects in a
systematic way. Taking the diquark-model parameters from foregoing studies of
other electron- and photon-induced baryonic reactions, our results agree well
with the most recent large momentum-transfer data for the $p\bar{p}$,
$\Lambda\bar{\Lambda}$, and $\Sigma^0\bar{\Sigma}^0$ channels.


title:
Unintegrated parton distributions and electroweak boson production at
  hadron colliders

abstract:
  We describe the use of doubly-unintegrated parton distributions in
hadron-hadron collisions, using the (z,k_t)-factorisation prescription where
the transverse momentum of the incoming parton is generated in the last
evolution step. We apply this formalism to calculate the transverse momentum
(P_T) distributions of produced W and Z bosons and compare the predictions to
Tevatron Run 1 data. We find that the observed P_T distributions can be
generated almost entirely by the leading order q_1 q_2 -> W,Z subprocesses,
using known and universal doubly-unintegrated quark distributions. We also
calculate the P_T distribution of the Standard Model Higgs boson at the LHC,
where the dominant production mechanism is by gluon-gluon fusion.


title:
Probing the charged Higgs quantum numbers through the decay H^+ -> W^+
  h^0

abstract:
  The vertex H^+_\alpha W^-h^0_\beta, involving the gauge boson W^+- and the
charged (H^+-_\alpha) and neutral Higgs bosons (h^0_\beta), arises within the
context of many extensions of the SM, and it can be used to probe the quantum
numbers of the Higgs multiplet. After presenting a general discusion for the
expected form of this vertex with arbitrary Higgs representations, we discuss
its strength for several specific models, which include: i) the Two-Higgs
Doublet Model (THDM), both the generic and the SUSY case, and ii) models with
additional Higgs triplets, including both SUSY and non-SUSY cases. We find that
in these models, there are regions of parameters where the decay H^+_\alpha ->
W^+ h^0_\beta, is kinematically allowed, and reaches Branching Ratios (BR) that
may be detectable, thus allowing to test the properties of the Higgs sector.


title:
Protecting the primordial baryon asymmetry in the seesaw model
  compatible with WMAP and KamLAND

abstract:
  We require that the primordial baryon asymmetry is not washed out in the
seesaw model compatible with the recent results of WMAP and the neutrino
oscillation experiments including the first results of KamLAND. We find that
only the case of the normal neutrino mass hierarchy with an approximate
$L_{e}$-symmetry satisfies the requirement. We further derive, depending on the
signs of neutrino mass eigenvalues, three types of neutrino mass matrixes,
where the values of each element are rather precisely fixed.


title:
Determining the Proximity of \Gamma^{\ast} N Scattering to the Black
  Body Limit Using DIS and J/ \psi Production

abstract:
  We use information about DIS and $J/ \psi$ production on hydrogen to model
the $t$-dependence of the $\gamma^{\ast} N$ scattering amplitude. We
investigate the profile function for elastic scattering of hadronic components
of the virtual photon off both a nucleon and heavy nuclear target, and we
estimate the value of the impact parameter where the black body limit is
reached. We also estimate the fraction of the cross section that is due to
hadronic configurations in the virtual photon wave function that approach the
unitarity limit. We extract, from these considerations, approximate lower
limits on the values of $x$ where the leading twist approximation in DIS is
violated. We observe that the black body limit may be approached within HERA
kinematics with $Q^{2}$ equal to a few GeV$^2$ and $x \sim 10^{-4}$.
Comparisons are made with earlier predictions by Munier {\it et al.}, and the
longitudinal structure function is compared with preliminary HERA data. The
principle advantage of our method is that we do not rely solely on the
$t$-dependence of $\rho$-meson production data. This allows us to extend our
analysis down to very small impact parameters and dipole sizes. Finally, we
perform a similar calculation with a $^{208}$Pb target, and we demonstrate that
the black body limit is already approached at $Q^{2} \sim 20$ GeV$^{2}$ and $x
\sim 10^{-4}$.


title:
Evidence for Mikheyev-Smirnov-Wolfenstein effects in solar neutrino
  flavor transitions

abstract:
  We point out that the recent data from the Sudbury Neutrino Observatory,
together with other relevant measurements from solar and reactor neutrino
experiments, convincingly show that the flavor transitions of solar neutrinos
are affected by Mikheyev-Smirnov-Wolfenstein (MSW) effects. More precisely, one
can safely reject the null hypothesis of no MSW interaction energy in matter,
despite the fact that the interaction amplitude (formally treated as a free
parameter) is still weakly constrained by the current phenomenology. Such a
constraint can be improved, however, by future data from the KamLAND
experiment. In the standard MSW case, we also perform an updated analysis of
two-family active oscillations of solar and reactor neutrinos.


title:
First Order Chiral Phase Transition from a Six-fermion
  ''Instanton''-Interaction

abstract:
  We compute the first order chiral phase transition for an instanton motivated
quark model with a local six-quark interaction. In order to compare different
solutions of the gap equation we compute the bosonic effective action -- a two
particle irreducible free energy functional. We find that the first order
transition ends for a critical current quark mass, with continuous crossover
for larger quark masses. Furthermore, we investigate different possible order
parameters, including a color octet condensate. We also compare our formalism
with mean field theory.


title:
Solutions to the Renormalization Group Equations for Yukawa Matrices as
  an Answer to the Quark and Lepton Mass Problem

abstract:
  If the scale dependence of a Yukawa matrix is assumed to be determined
entirely by the dominant 33-element, then the renormalization group equations
can be expressed in terms of two separate equations: a differential equation
for the 33-coupling, and, an algebraic equation for the scale-independent 3x3
matrix that is found to have only two non-trivial, hierarchical, solutions with
eigenvalues (0,0,1) and (0,1,1). The mass matrices are constructed from these
solutions by rotating them first by the experimentally known mixing
matrices-the CKM for quarks and charged leptons, and the CKM-analog for the
seesaw generated Majorana neutrinos-and then incorporating the appropriate
texture zeros. A uniform, hierarchical, description for the mass matrices of
quarks and leptons is thus achieved, in terms of the mixing paramters, that
give mass eigenvalues consistent with experiments as well as reproduce the
input mixing angles. Inverted hierarchy in neutrinos is also discussed. Only a
single scale (approx. 10^13 GeV) for the seesaw neutrinos is involved rather
than their mass distribution. No new particles are otherwise invoked.


title:
B^0-\bar{B}^0 mixing and B \to X_s \gamma decay in the third type 2HDM:
  effects of NLO QCD contributions

abstract:
  In this paper, we calculated the next-to-leading order (NLO) new physics
contributions to the mass splitting $\dmd$ and the branching ratio $\brbxsga$
induced by the charged Higgs loop diagrams in the third type of
two-Higgs-doublet models (model III) and draw the constraints on the free
parameters of model III. For the model III under consideration, we found that
(a) an upper limit $|\ltt|\leq 1.7$ is obtained from the precision data of
$\dmd=0.502 \pm 0.007 ps^{-1}$, while $|\ltt| \approx 0.5$ is favored
phenomenologicaly; (b) for $B \to X_s \gamma$ decay, the NLO QCD contributions
tend to cancel the LO new physics contributions; (c) a light charged Higgs
boson with a mass around or even less than 200 GeV is still allowed at NLO
level by the measured branching ratio $\brbxsga$: numerically, $188 \leq \mh
\leq 215$ GeV for $(|\ltt|,|\lbb|)=(0.5,18)$; (d) the NLO QCD contributions
tend to cancel the LO contributions effectively, the lower limit on $\mh$ is
consequently decreased by about 200 GeV; (e) the allowed region of $\mh$ will
be shifted toward heavy mass end for a non-zero relative phase $\theta$ between
the Yukawa couplings $\ltt$ and $\lbb$. The numerical results for the
conventional model II are also presented for the sake of a comparison.


title: B meson semileptonic decays

abstract:
  B meson semileptonic decays are a crucial tool in our studies of the quark
mixing parameters Vcb and Vub. The interplay between experimental and
theoretical challenges to achieve precision in the determination of these
fundamental parameters is discussed.


title:
Infrared divergences of $B$ meson exclusive decays to P-wave charmonia
  in QCD factorization and nonrelativistic QCD

abstract:
  In the framework of QCD factorization, we study the $B$ meson exclusive
decays $B\to \chi_{cJ}K$ where the spin-triplet P-wave charmonium states
$\chi_{cJ}(J=0,1,2)$ are described by the color-singlet non-relativistic wave
functions. We find that for these decays (except $\chi_{c1}$) there are
infrared divergences arising from nonfactorizable vertex corrections as well as
logarithmic end-point singularities arising from nonfactorizable spectator
interactions at leading-twist order. The infrared divergences due to vertex
corrections will explicitly break down QCD factorization within the
color-singlet model for charmonia. Unlike in the inclusive decays where the
higher Fock states with color-octet $c \bar c$ pair and soft gluon can make
contributions to remove the infrared divergences, their contributions can not
be accommodated in the exclusive two body decays. As a result, the infrared
divergences encountered in exclusive processes involving charmonia may raise a
new question to the QCD factorization and NRQCD factorization in B exclusive
decays.


title:
${\cal O}(\alpha_{s})$ QCD and ${\cal O}(\alpha_{ew})$ electroweak
  corrections to $t\bar{t}h^0$ production in $\gamma \gamma$ collision

abstract:
  We calculate the ${\cal O}(\alpha_{s})$ QCD and ${\cal O}(\alpha_{{\rm ew}})$
electroweak one-loop corrections in the Standard Model framework, to the
production of an intermediate Higgs boson associated with $t\bar{t}$ pair via
$\gamma \gamma$ fusion at an electron-positron linear collider (LC). We find
the ${\cal O}(\alpha_{s})$ QCD corrections can be larger than the ${\cal
O}(\alpha_{{\rm ew}})$ electroweak ones, with the variations of the Higgs boson
mass $m_{h}$ and $e^+e^-$ colliding energy $\sqrt{s}$. Both corrections may
significantly decrease or increase the Born cross section. The numerical
results show that the relative corrections from QCD to the process \eep may
reach 34.8%, when $\sqrt{s}=800$ GeV and $m_h=200$ GeV, while those from
electroweak can be -13.1%, -15.8% and -12.0%, at $\sqrt{s} = 800$ GeV, 1 TeV
and 2 TeV respectively.


title:
Monte Carlo simulation of an experiment looking for radiative solar
  neutrino decays

abstract:
  We analyse the possibility of detecting visible photons from a hypothetical
radiative decay of solar neutrinos. Our study is focused on the simulation of
such measurements during total solar eclipses and it is based on the BP2000
Standard Solar Model and on the most recent experimental information concerning
the neutrino properties.


title:
Parton energy loss or nuclear absorption: What quenches hadron spectra
  at HERA ?

abstract:
  We suggest and explore two observables which may clarify the origin of the
attenuation of semi-inclusive hadron production reported in DIS on nuclear
targets.


title:
Ground-State Scalar $\bar{q}q$ Nonet: SU(3) Mass Splittings and Strong,
  Electromagnetic, and Weak Decay Rates

abstract:
  By comparing SU(3)-breaking scales of linear mass formulae, it is shown that
the lowest vector and scalar mesons all have a $\bar{q}q$ configuration, while
the ground-state octet and decuplet baryons are $qqq$. Also, the quark-level
linear $\sigma$ model is employed to predict similar $\bar{q}q$ and $qqq$
states. Furthermore, the approximate mass degeneracy of the scalar $a_0$(985)
and $f_0$(980) mesons is demonstrated to be accidental. Finally, it is shown
that various strong, electromagnetic, and weak mesonic decay rates are
successfully explained within the framework of the quark-level linear $\sigma$
model.


title:
Ultraviolet sensitivity of rare decays in nonuniversal extra dimensional
  models

abstract:
  We consider a nonuniversal five dimensional model in which fermions are
localised on a four dimensional brane, while gauge bosons and a scalar doublet
can travel in the bulk. As a result of KK number non-conservation at the
brane-bulk intersection, the ultraviolet divergence does not cancel out in some
physical observables. For example, the $B_d \to l^+l^-$ decay amplitude is
linearly divergent, while $B$--$\bar{B}$ mixing amplitude is log divergent. We
attempt to identify the exact source of this nonrenormalizability. We compare
and contrast our results with those obtained in the universal five dimensional
model where all particles travel in the extra dimension.


title:
Chiral soliton models, large N_c consistency and the Theta^+ exotic
  baryon

abstract:
  Predictions for a light collective $\Theta^+$ baryon state (with strangeness
+1) based on the collective quantization of chiral soliton models are shown to
be inconsistent with large $N_c$ QCD. The lightest strangeness +1 state to
emerge from the analysis has an excitation energy which at large $N_c$ scales
as $N_c^0$ while collective quantization is legitimate only for excitations
which go to zero as $N_c \to \infty$. This inconsistency strongly suggests that
predictions for $\Theta^+$ properties based on collective quantization of
chiral solitons are not valid.


title: Complete Parameter Space of Quark Mass Matrices with Four Texture Zeros

abstract:
  The full parameter space of Hermitian quark mass matrices with four texture
zeros is explored by using current experimental data. We find that all ten free
parameters of the four-zero quark mass matrices can well be constrained. In
particular, only one of the two phase parameters plays an important role in CP
violation. The structural features of this specific pattern of quark mass
matrices are also discussed in detail.


title:
Littlest Higgs model and associated ZH production at high energy
  $e^{+}e^{-}$ collider

abstract:
  In the context of the littlest Higgs (LH) model, we consider the Higgs
strahlung process $e^{+}e^{-}\to ZH $. We find that the correction effects on
this process mainly come from the heavy photon $B'$. If we take the mixing
angle parameter $c$ in the range of 0.75 - 1, the contributions of the heavy
gauge boson $W_{3}'$ is larger than 6%. In most of the parameter space, the
deviation of the total production cross section $\sigma^{tot}$ from its SM
value is larger than 5%, which may be detected in the future high energy
$e^{+}e^{-}$ collider (LC) experiments. The future LC experiments could test
the LH model by measuring the cross section of the process $e^{+}e^{-}\to ZH $.


title: Neutrinoless Double Beta Decay in Light of SNO Salt Data

abstract:
  In the SNO data from its salt run, probably the most significant result is
the consistency with the previous results without assuming the 8B energy
spectrum. In addition, they have excluded the maximal mixing at a very high
confidence level. This has an important implication on the double beta decay
experiments. For the inverted or degenerate mass spectrum, we find
|<m_nu>_{ee}| > 0.013 eV at 95% CL, and the next generation experiments can
discriminate Majorana and Dirac neutrinos if the inverted or degenerate mass
spectrum will be confirmed by the improvements in cosmology, tritium data beta
decay, or long-baseline oscillation experiments.


title: Kaluza-Klein Structure Associated With Fat Brane

abstract:
  It is known that the imposition of orbifold boundary conditions on background
scalar field can give rise to a non-trivial vacuum expectation value (VEV)
along extra dimensions, which in turn generates fat branes and associated
unconventional Kaluza-Klein (KK) towers of fermions. We study the structure of
these KK towers in the limit of one large extra dimension and show that
normalizable (bound) states of massless and massive fermions can exist at both
orbifold fixed points. Closer look however indicates that orbifold boundary
conditions act to suppress at least half of bound KK modes, while periodic
boundary conditions tend to drive the high-lying modes to the conventional
structure. By investigating the scattering of fermions on branes, we
analytically compute masses and wavefunctions of KK spectra in the presence of
these boundary conditions up to one-loop level. Implication of KK-number
non-conservation couplings on the Coulomb potential is also examined.


title: Some Inequalities for the Generalized Parton Distribution E(x,0,t)

abstract:
  We discuss some constraints on the $x$ and $t$-dependence of $E(x,0,t)$ that
arise from positivity bounds in the impact parameter representation. In
addition, we show that $E(x,0,0)$ for the nucleon vanishes for $x\to 1$ at
least as rapidly as $(1-x)^4$. Finally we provide an inequality that limits the
contribution from $E$ to the angular momentum sum rule.


title: Cherenkov radiations from Quark Plasma

abstract:
  I propose an observable to declare the formation of Quark Plasma (QP) without
any doubts. It is the observation of Cherenkov photon radiations of the order
of 100 MeV associated with fast light charged particles while they are
penetrating hot dense mediums produced in high energy heavy ion collisions.
Direct observations of Cherenkov rings associated with charged leptons decayed
from $Z^0$ boson or Drell-Yang process which occur earlier than the QCD medium
formation or photon emissions associated with high $p_t$ hadrons would be a
definite signature of QP formation.


title: Radiative decays of phi-meson about nature of light scalar resonances

abstract:
  We show on gauge invariance grounds that the fine threshold phenomenon is
discovered in the radiative decays phi->gamma a0->gamma pi0 eta and phi->gamma
f0->gamma pi0pi0. This enables to conclude that production of the lightest
scalar mesons a0(980) and f0(980) in these decays is caused by the four-quark
transitions, resulting in strong restrictions on the large NC expansions of the
decay amplitudes. The analysis shows that these constraints give new evidences
in favor of the four-quark nature of a0(980) and f0(980) mesons.


title: BABAR Resonance and Four-quark Mesons

abstract:
  The new narrow resonance which has been observed at the B factories is
assigned to the I_z=0 component of iso-triplet charmed four-quark mesons, and
as its consequence, existence of additional narrow resonances in different
channels is predicted.


title: BCVEGPY: An Event Generator for Hadronic Production of the B_c Meson

abstract:
  We have written a Fortran programme BCVEGPY, which is an event generator for
the hadronic production of the $B_c$ meson through the dominant hard subprocess
$gg\to B_c(B_c^*) +b+\bar{c}$. To achieve a compact programme, we have written
the amplitude of the subprocess with the particle helicity technique and made
it as symmetric as possible, by decomposing the gluon self couplings and then
applying the symmetries. To check the programme, various cross sections of the
subprocess have been computed numerically and compared with those in the
literature. BCVEGPY is written in a PYTHIA-compatible format, thus it is easy
to implement in PYTHIA.


title:
Uncertainties in Estimating Hadronic Production of the Meson B_c and
  Comparisons between TEVATRON and LHC

abstract:
  The uncertainties in estimating the hadronic production of the $B_c$ meson
are studied under the framework of the complete $\alpha_s^4$ approach of the
perturbative QCD and the gluon-gluon fusion mechanism. Quantitative comparisons
on the production at TEVATRON and LHC are made. Considering the detectors at
TEVATRON and LHC, we have also estimated the production with proper kinematic
cuts. Based on the results, we conclude that the experimental studies of the
$B_c$ meson at the two colliders will be complimentary and stimulative. We find
that as c.m. energy is increasing from RUN-I to RUN-II at TEVATRON, the
production cross-section increases about 20%.


title:
Calculation of gluon and four-quark condensates from the operator
  expansion

abstract:
  The magnitudes of gluon and four-quark condensates are found from the
analysis of vector mesons consisting of light quarks (the families of $\rho$
and $\omega$ mesons) in the 3 loops approximation. The QCD model with infinite
number of vector mesons is used to describe the function $R(s)$. This model
describes well the experimental function $R(s)$. Polarization operators
calculated with this model coincide with the Wilson operator expansion at large
$Q^2$. The improved perturbative theory, such that the polarization operators
have correct analytical properties, is used. The result is $<0 | (\alpha_s/\pi)
G^2 | 0 > = 0.062 \pm 0.019 GeV^4$. The electronic widths of $\rho(1450)$ and
$\omega(1420)$ are calculated.


title:
Radiative events in DIS of unpolarized electron by tensor polarized
  deuteron. Radiative events

abstract:
  DIS of unpolarized electron by tensor-polarized deuteron with tagged
collinear photon, radiated from initial electron, was considered. The cross
section is derived in the Born approximation. The model-independent QED
corrections to the Born cross section are also calculated using approach based
on the account of all essential Feynman diagrams.


title: Quintessence and the dark matter abundance

abstract:
  Results of a recent study on how the Quintessence scalar could affect the
relic abundance of dark matter particles are presented.


title: QCD Saturation and Soft Processes

abstract:
  We show that an approximate solution to the amended non-linear
Balitsky-Kovchegov evolution equation which was formulated for hard QCD
processes, can be extended to provide a good description of photoproduction and
soft hadronic (non perturbative) reactions.


title: Summary of the Working Group on Spin Physics

abstract:
  A summary is given of the experimental and theoretical results presented in
the working group on spin physics. New data on inclusive and semi-inclusive
deep-inelastic scattering, combined with theoretical studies of the polarized
distribution functions of nucleons, were presented. Many talks addressed the
relatively new subjects of transversity distributions and generalized parton
distributions. These distributions can be studied by measuring single spin
asymmetries, while partonic intrinsic motion and models of new spin dependent
distribution and fragmentation functions are needed to obtain the corresponding
theoretical description. These subjects are not only studied in deep-inelastic
lepton scattering, but also in polarized proton-proton collisions at RHIC. A
selection of results that have been obtained in these experiments together with
several associated theoretical ideas are presented in this paper. In
conclusion, a brief sketch is given of the prospects for experimental and
theoretical studies of the spin structure of the nucleon in the coming years.


title: Deep Inelastic Scattering in the Color Glass Formalism

abstract:
  I discuss dome phenomenological consequences of the Color Glass formalism for
deep inelastic scattering.


title:
Consequences of Leading-Logarithm Summation for the Radiative Breakdown
  of Standard-Model Electroweak Symmetry

abstract:
  In the empirically sensible limit in which QCD, t-quark Yukawa, and
scalar-field-interaction coupling constants dominate all other Standard-Model
coupling constants, we sum all leading-logarithm terms within the perturbative
expansion for the effective potential that contribute to the extraction of the
Higgs boson mass via radiative electroweak symmetry breaking. A Higgs boson
mass of 216 GeV emerges from such terms, as well as a scalar-field-interaction
coupling constant substantially larger than that anticipated from conventional
spontaneous symmetry breaking. The sum of the effective potential's leading
logarithms is shown to exhibit a local minimum in the limit $\phi \to 0$ if the
QCD coupling constant is sufficiently strong, suggesting (in a multiphase
scenario) that electroweak physics may provide the mechanism for choosing the
asymptotically-free phase of QCD.


title: Family Replicated Gauge Group Models

abstract:
  Family Replicated Gauge Group models of the type SU(n)^N\times SU(m)^N,
(SMG)^3 and (SMG\times U(1)_{B-L})^3 are reviewed, where SMG=SU(3)_{c}\times
SU(2)_{L}\times U(1)_{Y} is the gauge symmetry group of the Standard Model, $B$
is the baryon and $L$ is the lepton numbers, respectively. It was shown that
Family Replicated Gauge Group model of the latter type fits the Standard Model
fermion masses and mixing angles and describes all neutrino experiment data
order magnitudewise using only 5 free parameters -- five vacuum expectation
values of the Higgs fields which break the Family Replicated Gauge Group
symmetry to the Standard Model. The possibility of [SU(5)]^3 or [SO(10)]^3
unification at the GUT-scale \sim 10^{18} GeV also is briefly considered.


title: Status of three-neutrino oscillations after the SNO-salt data

abstract:
  We perform a global analysis of neutrino oscillation data in the framework of
three neutrinos, including the recent improved measurement of the neutral
current events at SNO. In addition to all current solar neutrino data we take
into account the reactor neutrino data from KamLAND and CHOOZ, the atmospheric
neutrino data from Super-Kamiokande and MACRO, as well as the first spectral
data from the K2K long baseline accelerator experiment. The up-to-date best fit
values and allowed ranges of the three-flavour oscillation parameters are
determined from these data. Furthermore, we discuss in detail the status of the
small parameters alpha = Delta_m^2_Sol / Delta_m^2_Atm and sin^2(theta_13),
which fix the possible strength of CP violating effects in neutrino
oscillations.


title:
Resonant Production of Scalar Diquarks at the Next Generation
  Electron-Positron Colliders

abstract:
  We investigate the potential of TESLA and JLC/NLC electron-positron linear
collider designs to observe diquarks produced resonantly in processes involving
hard photons.


title: Bounds on Four-Fermion Contact Interactions Induced by String Resonances

abstract:
  Based on tree-level open-string scattering amplitudes in the low string-scale
scenario, we derive the massless fermion scattering amplitudes. The amplitudes
are required to reproduce those of the Standard Model at tree level in the low
energy limit. We then obtain four-fermion contact interactions by expanding in
inverse powers of the string scale and explore the constraints on the string
scale from low energy data. The Chan-Paton factors and the string scale are
treated as free parameters. We find that data from the neutral and charged
current processes at HERA, Drell-Yan process at the Tevatron, and from LEP-II
put lower bounds on the string scale M_S >= 0.9-1.3 TeV for typical values of
the Chan-Paton factors, which are comparable to Tevatron bounds on Z' and W'
masses.


title: The Large Energy Expansion for B Decays: Soft Collinear Effective Theory

abstract:
  I this talk I give an introduction to the soft collinear effective theory by
considering in detail the decay rate for $B \to X_s \gamma$ near the endpoint.


title:
GUT Scale Inflation, Non-Thermal Leptogenesis, and Atmospheric Neutrino
  Oscillations

abstract:
  Leptogenesis scenarios in supersymmetric hybrid inflation models are
considered. Sufficient lepton asymmetry leading to successful baryogenesis can
be obtained if the reheat temperature T_r>10^6 GeV and the superpotential
coupling parameter kappa is in the range 10^-6<kappa<10^-2. For this range of
kappa the scalar spectral index n_s=0.99+-0.01. Constraints from neutrino
mixing further restrict the range of kappa that is allowed. We analyze in
detail the case where the inflaton predominantly decays into the
next-to-lightest right handed Majorana neutrino taking into account especially
the constraints from atmospheric neutrino oscillations.


title: NLL QED Corrections to Deep Inelastic Scattering

abstract:
  The $O(\alpha^2\log(Q^2/m_e^2))$ leptonic QED corrections to unpolarized
deeply inelastic electron-nucleon scattering are calculated in the mixed
variables.


title: Charmless $\bar{B}_s\to VV$ Decays in QCD Factorization

abstract:
  The two body charmless decays of $B_s$ meson to light vector mesons are
analyzed within the framework of QCD factorization. This approach implies that
the nonfactorizable corrections to different helicity amplitudes are not the
same. The effective parameters $a_i^h$ for helicity $h=0,+,-$ states receive
different nonfactorizable contributions and hence are helicity dependent,
contrary to naive factorization approach where $a_i^h$ are universal and
polarization independent. The branching ratios for $\bar{B}_s\to VV$ decays are
calculated and we find that branching ratios of some channels are of order
$10^{-5}$, which are measurable at future experiments. The transverse to total
decay rate $\Gamma_T/\Gamma$ is also evaluated and found to be very small for
most decay modes, so, in charmless $\bar{B}_s\to VV$ decays, both light vector
mesons tend to have zero helicity.


title: Nucleon Transversity Properties Through ep Scattering

abstract:
  The T-odd distribution functions contributing to transversity properties of
the nucleon and their role in fueling nontrivial contributions to azimuthal
asymmetries in semi-inclusive deep inelastic scattering are investigated. We
use a dynamical model to evaluate these quantities in terms of HERMES
kinematics. We point out how the measurements of cos(2phi) asymmetry may
indicate the presence of T-odd structures in unpolarized ep scattering.


title:
Comment on triple gauge boson interactions in the non-commutative
  electroweak sector

abstract:
  In this comment we present an analysis of electroweak neutral triple gauge
boson couplings projected out of the gauge sector of the extended
non-commutative standard model. A brief overview of the current experimental
situation is given.


title: The Effects of Quantum Entropy on the Bag Constant

abstract:
  The effects of quantum entropy on the bag constant are studied at low
temperatures and small chemical potentials. The inclusion of the quantum
entropy of the quarks in the equation of state provides the hadronic bag with
an additional heat which causes a decrease in the effective latent heat inside
the bag. We have considered two types of baryonic bags, $\Delta$ and
$\Omega^-$. In both cases we have found that the bag constant without the
quantum entropy almost does not change with the temperature and the quark
chemical potential. The contribution from the quantum entropy to the equation
of state clearly decreases the value of the bag constant.


title: The kinetic energy for the static SU(2) Polyakov line

abstract:
  At very high temperatures Yang--Mills theories can be described through
perturbation theory. At the tree level the time components of the gluon fields
decouple and yield a dimensionally reduced theory. The expectation value of the
Polyakov loop then assumes values of the Z(N) center group. At intermediate
temperatures, however, this is not true anymore. The time dependence shows up
in loops. In a recent work we integrated out fast varying quantum fluctuations
around background A_i and static A_4 fields. We assumed that these fields are
slowly varying but that the amplitude of A_4 is arbitrary. As a result we
obtained the kinetic energy terms for the Polyakov loop both for the electric
and the magnetic sector of SU(2).


title: The quark vacuum

abstract:
  We conjecture on the structure of the quark vacuum from a viewpoint somewhat
different from, but perhaps supplementary to, standard philosophies. Using a
rather simple dynamical Hamiltonian model, vacuum excitations carrying
helicities 0 and +/-1 are discussed in connection with the dynamical stability
of solutions. We speculate on how the rest masses of the light mesons pi^0,
eta^0 and eta'^0 could be related to these excitations.


title:
Fluctuations of Strangeness and Deconfinement Phase Transition in
  Nucleus-Nucleus Collisions

abstract:
  We suggest that the fluctuations of strange hadron multiplicity could be
sensitive to the equation of state and microscopic structure of strongly
interacting matter created at the early stage of high energy nucleus-nucleus
collisions. They may serve as an important tool in the study of the
deconfinement phase transition. We predict, within the statistical model of the
early stage, that the ratio of properly filtered fluctuations of strange to
non-strange hadron multiplicities should have a non-monotonic energy dependence
with a minimum in the mixed phase region.


title:
The Peccei-Quinn Axion in the Next-to-Minimal Supersymmetric Standard
  Model

abstract:
  We discuss the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with a
Peccei-Quinn (PQ) U(1) symmetry. When this symmetry is dynamically broken by
the Higgs mechanism, the resulting pseudo-Nambu-Goldstone boson takes the role
of an axion. Although much of the allowed parameter space for low values of the
PQ scale has been ruled out, many scenarios with a PQ scale > 10^9 GeV remain
untested, allowing the NMSSM PQ axion to provide a solution to the strong CP
problem and be a good dark matter candidate. Unfortunately the new particle
states are so decoupled that they would not be observable at future colliders,
and the NMSSM would appear indistinguishable from the minimal model. However,
we show that in order to maintain vacuum stability, such a model requires that
the heavy Higgs boson states have masses that lie close to approximately mu tan
beta. Therefore, a measurement of the Heavy Higgs boson masses at the LHC would
allow one to either rule out the NMSSM PQ axion, or provide tantalizing
circumstantial evidence for its existence.


title:
Coexistence of different vacua in the effective quantum field theory and
  Multiple Point Principle

abstract:
  According to the Multiple Point Principle our Universe is on the coexistence
curve of two or more phases of the quantum vacuum. The coexistence of different
quantum vacua can be regulated by the exchange of the global fermionic charges
between the vacua, such as baryonic, leptonic or family charge. If the
coexistence is regulated by the baryonic charge, all the coexisting vacua
exhibit the baryonic asymmetry. Due to the exchange of the baryonic charge
between the vacuum and matter which occurs above the electroweak transition,
the baryonic asymmetry of the vacuum induces the baryonic asymmetry of matter
in our Standard-Model phase of the quantum vacuum. The present baryonic
asymmetry of the Universe indicates that the characteristic energy scale which
regulates the equilibrium coexistence of different phases of quantum vacua is
about 10^6 GeV.


title: A hybrid model for $\gamma^* p$ scattering at small Bjorken-x

abstract:
  We extend the dipole model for virtual photon - proton scattering to include
the resolved photon component explicitly. The parameters of the resolved photon
component are taken from the literature, while the parameters of the
dipole-nucleon interaction are fitted to the HERA data. A good agreement with
experimental data is obtained beyond the region of the fit.


title:
From unintegrated gluon distributions to particle production in hadronic
  collisions at high energies

abstract:
  The inclusive distributions of gluons and pions for high-energy NN collisions
are calculated. The results for several unintegrated gluon distributions
(UGD's) from the literature are compared. We find huge differences in both
rapidity and $p_t$ of gluons and $\pi$'s in NN collisions for different models
of UGD's. The Karzeev-Levin UGD gives good description of momentum distribution
of charged hadrons at midrapidities. We find that the gluonic mechanism
discussed does not describe the inclusive spectra of charged particles in the
fragmentation region.


title: A novel route to V_us

abstract:
  Already in the past, hadronic tau decays have served as an interesting source
to obtain information on the parameters of the Standard Model, like the strong
coupling alpha_s or the strange quark mass. Below it will be shown that the
approach to obtain the strange mass from the hadronic tau-decay width can be
turned into a determination of the CKM matrix element V_us, once the strange
mass is used as an input from other sources. At present, we obtain V_us =
0.2179 +- 0.0045, where the error is completely dominated by the experimental
uncertainty, and can be improved through an improved measurement of the
hadronic tau-decay rate into strange particles R_tau,S.


title: Coherent Neutrino-Nucleus Scattering

abstract:
  We review coherent scattering of neutrinos on nuclei by coupling the weak
currents to vector and axial-vector meson states. The couplings are obtained
from known reactions, like $\tau$--lepton and vector meson decays. We compute
and present the cross sections as functions of energy and momentum transfer for
various kinematic regions, including those which are relevant to oscillation
experiments. The results are presented in figures and are consistent with
numerical values used in the interpretation of oscillation experiments.


title:
The Higgs Mass Bound in Gauge Extensions of the Minimal Supersymmetric
  Standard Model

abstract:
  The minimal supersymmetric standard model, and extensions, have stringent
upper bounds on the mass of the lightest Higgs boson if perturbativity up to
the Planck scale is assumed. We argue that these bounds are softened
tremendously if the Higgs is charged under an asymptotically free gauge group.
We present a model with an additional SU(2) gauge group which easily produces
Higgs masses above 200 GeV while avoiding electroweak constraints. If one
allows some fine-tuning of the high-scale value of the gauge coupling, Higgs
masses greater than 350 GeV are achieved. Unification of couplings is predicted
to similar accuracy as in the minimal supersymmetric standard model with only
small deviations at the two-loop level.


title: Partners of the Theta^+ in Large N_c QCD

abstract:
  A strangeness +1 exotic baryon Theta^+ has recently been seen in a number of
experiments. We demonstrate that in large N_c QCD the existence of such a state
implies the existence of S = +1 partner states with various spins and isospins
but comparable masses. We discuss the spectroscopy of such states and possible
channels in which they can be observed, based on the simple assumption that
those states with pentaquark quantum numbers are unlikely to be large N_c
artifacts.


title: Propagation of Fast Partons in the Nuclear Medium

abstract:
  The color dipole approach has been applied in the target rest frame to
address the issues of transverse momentum broadening and energy loss of a fast
quark propagating in the nuclear medium. A recent application of the theory to
the FermiLab E772/E866 experimental data, determining the rate of energy loss
of a quark propagating in the medium to be 2 to 3 GeV/fm, will be reviewed.
Calculations for the transverse momentum distribution will be presented, and
the results will be compared to the E866 data. The theory will be shown to
compare favorably to the data, and these results will be shown to suggest that
the momentum broadening of a quark is about twice the generally accepted size.


title: A different see-saw formula for neutrino masses

abstract:
  In a wide class of unified models there is an additional (and possibly
dominant) term in the neutrino mass formula that under the simplest assumption
takes the form M_{\nu} = (M_N + M_N^T)u/M_G, where M_N is the neutrino Dirac
mass matrix, and u = O(M_W). This makes possible highly predictive models. A
generalization of this form yields realistic neutrino masses and mixings more
readily than the usual see-saw formula in some models.


title:
The total virtual photoabsorption cross section, deeply virtual Compton
  scattering and vector-meson production

abstract:
  Based on the two-gluon-exchange dynamical mechanism for deeply inelastic
scattering at low x ~= Q^2/W^2 <<1, we stress the intimate connection between
the total virtual photoabsorption cross section, deeply virtual Compton
scattering and vector-meson electroproduction. A simple expression for the
cross section for deeply virtual Compton scattering is derived. Parameter-free
predictions are obtained for deeply-virtual Compton forward scattering and
vector-meson forward production, once the parameters in the total virtual
photoabsorption cross section are determined in a fit to the experimental data
on deeply inelastic scattering. Our predictions are compared with the
experimental data from HERA.


title:
The Lorentz and CPT violating effects on H^0\to f^+ f^- (ZZ, W^+ W^-)
  decays

abstract:
  We study the Lorentz and CPT violating effects on the ratio
\frac{BR_{LorVio}}{BR_{SM}}, where BR_{LorVio} (BR_{SM}) is the branching
ratios coming from the Lorentz violating effects (the SM), for the decays
H^0\to f^+ f^- (f= quarks and charged leptons) and H^0\to ZZ (W^+ W^-). We
observe that these new effects are too small to be detected, especially for f^+
f^- output, since the corresponding coefficients are highly suppressed at the
low energy scale.


title:
Log(1/x) Gluon Distribution and Structure Functions in the Loop-Loop
  Correlation Model

abstract:
  We consider the interaction of the partonic fluctuation of a scalar
``photon'' with an external color field to calculate the leading and
next-to-leading order gluon distribution of the proton following the work done
by Dosch-Hebecker-Metz-Pirner. We relate these gluon distributions to the short
and long distance behavior of the cross section of an adjoint dipole scattering
off a proton. The leading order result is a constant while the next-to-leading
order result shows a ln(1/x) enhancement at small x. To get numerical results
for the gluon distributions at the initial scale Q^2_0=1.8 GeV^2, we compute
the adjoint dipole-proton cross section in the loop-loop correlation model.
Quark distributions at the same initial scale are parametrized according to
Regge theory. We evolve quark and gluon distributions to higher Q^2 values
using the DGLAP equation and compute charm and proton structure functions in
the small-x region for different Q^2 values.


title: The Neutrino mass matrix after Kamland and SNO salt enhanced results

abstract:
  An updated analysis of all available neutrino oscillation evidence in Solar
experiments including the latest SNO ES,CC and NC data (254d live time, NaCL
enhanced efficiency) is presented. We obtain, for the fraction of active
oscillating neutrinos:
  sin^2alpha=(\Phi_{NC}-\Phi_{CC})/(\Phi_{SSM}-\Phi_{CC})=0.94^{+0.0.065}_{-0.060}
  nearly 20\sigma from the pure sterile oscillation case. The fraction of
oscillating sterile neutrinos cos^2\alpha \lsim 0.12 (1 sigma CL). At face
value, these results might slightly favour the existence of a small sterile
oscillating sector. In the framework of two active neutrino oscillations we
determine individual neutrino mixing parameters and their errors we obtain
Delta m^2= 7.01\pm 0.08 \times 10^{-5} eV^2, tan^2 theta=0.42^{+0.12}_{-0.07}.
The main difference with previous analysis is a better resolution in parameter
space. In particular the secondary region at larger mass differences (LMAII) is
now excluded at 95% CL. The combined analysis of solar and Kamland data
concludes that maximal mixing is not favoured at 4-5 sigma. This is not
supported by the antineutrino reactor results alone. We estimate the individual
elements of the two neutrino mass matrix, writing M^2=m^2 I+M_0^2, we obtain (1
sigma errors):
  M_0^2=10^{-5} eV^2\pmatrix{
  2.06^{+0.29}_{-0.31} & 3.15^{+0.29}_{-0.35} \cr
  3.15^{+0.29}_{-0.35} & 4.60^{+0.56}_{-0.44} }.


title:
Measurement of the 214Bi spectrum in the energy region around the
  Q-value of 76Ge neutrinoless double-beta decay

abstract:
  In this work we present the results obtained measuring the 214Bi spectrum
from a 226Ra source with a high purity germanium detector. Our attention was
mostly focused on the energy region around the Q-value of 76Ge neutrinoless
double-beta decay (2039.006 keV). The results of this measurement are strongly
related to the first indication for the neutrinoless double beta decay of 76Ge,
given by a recent analysis \cite{Evidence,KK02-PN,KK02-Found,KK-BigArt02} of
the data collected during ten years of measurements from the HEIDELBERG-MOSCOW
experiment.


title: Instantons and Scalar Multiquark States: From Small to Large N_c

abstract:
  We study scalar quark-anti-quark and two-quark-two-anti-quark correlation
functions in the instanton liquid model. We show that the instanton liquid
supports a light scalar-isoscalar (sigma) meson, and that this state is
strongly coupled to both $(\bar{q}q)$ and $(\bar{q}q)^2$. The scalar-isovector
$a_0$ meson, on the other hand, is heavy. We also show that these properties
are specific to QCD with three colors. In the large $N_c$ limit the
scalar-isoscalar meson is not light, and it is mainly coupled to $(\bar{q}q)$.


title: Identifying String Relics at AUGER?

abstract:
  The identification of string relics, or of other very massive states, at
forthcoming ultra high energy cosmic rays experiments, requires a good
reconstruction of the main properties of the extensive air showers produced by
the collision of the primary protons with the atmosphere. In particular, the
current hadronization models used in the simulations need to incorporate
possible new interactions. We briefly discuss these aspects and then proceed by
describing some of the observables which characterize the atmospheric shower.
The linear growth of the multiplicities - as a function of the energy - for all
the main particles in the shower can play an interesting role in an attempt to
identify channels of missing energy due to a plausible dark matter component.


title:
Production of the top-pions at the THERA collider based $\gamma p$
  collisions

abstract:
  In the framework of the topcolor-assisted technicolor (TC2) models, we study
the production of the top-pions $\pi^{0}_{t}$, $\pi_{t}^{\pm}$ via the
processes $ep\to\gamma c\to\pi^{0}_{t}c$ and $ep\to\gamma c\to\pi^{\pm}_{t}b$
mediated by the anomalous top coupling $tc\gamma$. We find that the production
cross section of the process $ep\to\gamma c\to\pi^{0}_{t}c$ is very small. With
reasonable values of the parameters in TC2 models, the production cross section
of the process $ep\to\gamma c\to\pi^{\pm}_{t}b$ can reach $ 1.2pb$. The charged
top-pions $\pi^{\pm}_{t}$ might be directly observed via this process at the
THERA collider based $\gamma p$ collisions.


title: Jet observables in hadronic dijet production

abstract:
  We present a numerical program, CAESAR, that allows us to resum large
logarithmic contributions to jet observables in a fully automated way. As an
application we obtain the first next-to-leading logarithmic distributions for
event shapes in hadronic dijet production.


title:
Average Kinetic Energy of Heavy Quark ($\mu_\pi^2$) inside Heavy Meson
  of $0^-$ State by Bethe-Salpeter Method

abstract:
  The average kinetic energy of the heavy quark inside $B$ or $D$ meson is
computed by means of the instantaneous Bethe-Salpeter method. We first solve
the relativistic Salpeter equation and obtain the relativistic wave function
and mass of $0^{-}$ state, then we use the relativistic wave function to
calculate the average kinetic energy of the heavy quark inside heavy meson of
$0^{-}$ state. We find that the relativistic corrections to the average kinetic
energy of the heavy quark inside $B$ or $D$ meson are quite large and cannot be
ignored. We estimate $\mu^2_\pi~ (= - \lambda_1)~ \approx~ 0.35~ (B^0,B^\pm)$,
$~0.28~(D^0,D^\pm)$, $~ 0.43~(B_s)$, $~0.34~(D_s)$, $~0.96~(B_c)$ and
$0.62~(\eta_c)$ GeV$^2$.


title: Inflationary Attractor in Braneworld Scenario

abstract:
  We demonstrate the attractor behavior of inflation driven by a scalar field
or a tachyon field in the context of recently proposed four-dimensional
effective gravity induced on the world-volume of a three-brane in
five-dimensional Einstein gravity, and we obtain a set of exact inflationary
solutions. Phase portraits indicate that an initial kinetic term decays rapidly
and it does not prevent the onset of inflation. The trajectories more rapidly
reach the slow-roll curve than in the standard cosmology.


title: Diquark model for $J/ \psi$ baryonic decays

abstract:
  The baryonic decays of $J/ \psi$ provide a new way to study the internal
structure of baryons. We apply a simple diquark model to the calculation of the
decay cross-sections for the reactions $J/ \psi \longrightarrow \bar{p}p$,
$\bar pN^*(1440)$, $\bar{N}^{\ast}N^{\ast}$, $\bar{\Lambda}\Lambda$ and
$\bar\Sigma^0\Sigma^0$. The results are different from those given by the
ordinary constituent quark model. Hence these reactions may provide a new check
of two different pictures for the baryons.


title: Yukawa Textures and the mu-term

abstract:
  We show how with an anomaly-free U(1), simple assumptions concerning the
origin of Yukawa textures and the Higgs mu-term lead to the prediction of a new
physics scale of 10^8GeV and automatic conservation of baryon number.


title: Strong Phases in the Decays B to D Pi

abstract:
  The observed strong phase difference of 30^{o} between I=(3/2) and I=(1/2)
final states for the decay B to D Pi is analyzed in terms of rescattering like
D^{∗}Pi to D Pi, etc. It is concluded that for the decay B^{o}to D^{+}
Pi^{-} the strong phase is only about 10^{o}. Implications for the
determination of sin(2 Beta + gamma) are discussed.


title: Majorana Phase in Minimal S_3 Invariant Extension of the Standard Model

abstract:
  The leptonic sector in a recently proposed minimal extension of the standard
model, in which the permutation symmetry S_3 is assumed to be an exact flavor
symmetry at the weak scale, is revisited. We find that S_3 with an additional
Z_{N} symmetry allows CP violating phases in the neutrino mixing.
  The leptonic sector contains six real parameters with two independent phases
to describe charged lepton and neutrino masses and the neutrino mixing. The
model predicts: an inverted spectrum of neutrino mass, tan
theta_{23}=1+O(m_e^2/m_mu^2) and sin
theta_{13}=m_e/sqrt{2}m_mu+O(m_em_mu/m_{tau}^2) simeq 0.0034. Neutrino mass as
well as the effective Majorana mass <m_{ee}> in the neutrinoless double-beta
decay can be expressed in a closed form as a function of phi_nu, Delta
m^2_{21},Delta m^2_{23} and tantheta_{12}, where phi_nu is one of the
independent phases. The model also predicts <m_{ee}> geq (0.036 - 0.066) eV.


title:
Probing R-parity violating models of neutrino mass at the Tevatron via
  top Squark decays

abstract:
  We have estimated the limiting branching ratio of the R-parity violating
(RPV) decay of the lighter top squark, $\tilde t_1 \ar l^+ d$ ($l=e$ or $\mu $
and d is a down type quark of any flavor), as a function of top squark
mass($\MST$) for an observable signal in the di-lepton plus di-jet channel at
the Tevatron RUN-II experiment with 2 fb$^{-1}$ luminosity. Our simulations
indicate that the lepton number violating nature of the underlying decay
dynamics can be confirmed via the reconstruction of $\MST$. The above decay is
interesting in the context of RPV models of neutrino mass where the RPV
couplings ($\lambda'_{i3j}$) driving the above decay are constrained to be
small ($\lsim 10^{-3} - 10^{-4} $). If $\tilde t_1$ is the next lightest super
particle - a theoretically well motivated scenario - then the RPV decay can
naturally compete with the R-parity conserving (RPC) modes which also have
suppressed widths. The model independent limiting BR can delineate the
parameter space in specific supersymmetric models, where the dominating RPV
decay is observable and predict the minimum magnitude of the RPV coupling that
will be sensitive to Run-II data. We have found it to be in the same ballpark
value required by models of neutrino mass, for a wide range of $\MST$. A
comprehensive future strategy for linking top squark decays with models of
neutrino mass is sketched.


title: Fermion Masses and Mixing in Intersecting Branes Scenarios

abstract:
  We study the structure of Yukawa couplings in intersecting D6-branes wrapping
a factorizable 6-torus compact space T^6. Models with MSSM-like spectrum are
analyzed and found to fail in predicting the quark mass spectrum because of the
way in which the family structure for the left-handed, right-handed quarks and,
eventually, the Higgses is `factorized' among the different tori. In order to
circumvent this, we present a model with three supersymmetric Higgs doublets
which satisfies the anomaly cancellation condition in a more natural way than
the previous models, where quarks were not treated universally regarding their
branes assignments, or some particular branes were singled out being invariant
under orientifold projection. In our model, the family structures for the left,
right quarks, left leptons and the Higgses arise from one of the tori and can
naturally lead to universal strength Yukawa couplings which accommodate the
quark mass hierarchy and the mixing angles.


title:
First 10 kg of Naked Germanium Detectors in Liquid Nitrogen installed in
  the GENIUS-Test-Facility

abstract:
  The first four naked high purity Germanium detectors were installed
successfully in liquid nitrogen in the GENIUS-Test-Facility (GENIUS-TF) in the
GRAN SASSO Underground Laboratory on May 5, 2003. This is the first time ever
that this novel technique aiming at extreme background reduction in search for
rare decays is going to be tested underground. First operational parameters are
presented.