title:
Implication of the $B \to (\rho, \omega) \gamma$ Branching Ratios for
  the CKM Phenomenology

abstract:
  We study the implication of the recent measurement by the BELLE collaboration
of the averaged branching fraction $\bar B_{exp} [B \to (\rho, \omega) \gamma]
= (1.8^{+0.6}_{-0.5} \pm 0.1) \times 10^{-6}$ for the CKM phenomenology.
Combined with the averaged branching fraction $\bar B_{exp} (B \to K^* \gamma)
= (4.06 \pm 0.26) \times 10^{-5}$ measured earlier, this yields $\bar R_{exp}
[(\rho, \omega) \gamma/K^* \gamma] = (4.2 \pm 1.3)%$ for the ratio of the two
branching fractions. Updating earlier theoretical analysis of these decays
based on the QCD factorization framework, and constraining the CKM-Wolfenstein
parameters from the unitarity fits, our results yield $\bar B_{th} [B \to
(\rho, \omega) \gamma] = (1.38 \pm 0.42) \times 10^{-6}$ and $\bar R_{th}
[(\rho, \omega) \gamma/K^* \gamma] = (3.3 \pm 1.0)%$, in agreement with the
BELLE data. Leaving instead the CKM-Wolfenstein parameters free, our analysis
gives (at 68% C.L.) $0.16\leq |V_{td}/V_{ts}| \leq 0.29$, which is in agreement
with but less precise than the indirect CKM-unitarity fit of the same, $0.18
\leq |V_{td}/V_{ts}| \leq 0.22$. The isospin-violating ratio in the $B \to \rho
\gamma$ decays and the SU(3)-violating ratio in the $B_d^0 \to (\rho^0, \omega)
\gamma$ decays are presented together with estimates of the direct and
mixing-induced CP-asymmetries in the $B \to (\rho,\omega) \gamma$ decays within
the SM. Their measurements will overconstrain the angle $\alpha$ of the
CKM-unitarity triangle.


title: The 115 GeV signal from nuclear physics

abstract:
  According standard models of nuclei, steepest variations of binding energy at
the drip lines should happen for nuclear masses of 45, 68, 92, 115, 175 and 246
GeV. We explore the coincidence of these masses with another ones from well
known HEP research and we wonder how much, of it, is an experimental
measurement coming from low energy research.


title:
Theoretical evidence for a tachyonic ghost state contribution to the
  gluon propagator in high energy, forward quark-quark `scattering'

abstract:
  Implications stemming from the inclusion of non-perturbative, confinining
effects, as contained in the Stochastic Vacuum Model of Dosch and Simonov, are
considered in the context of a, hypothetical, quark-quark `scattering process'
in the Regge kinematical region. In a computation wherein the non-perturbative
input enters as a correction to established perturbative results, a careful
treatment of infrared divergencies is shown to imply the presence of an
effective propagator associated with the existence of a linear term in the
static potential. An equivalent statement is to say that the modified gluonic
propagator receives contribution from a tachyonic ghost state, an occurence
which is fully consistent with earlier such suggestions made in the context of
low energy QCD phenomenology.


title: Double Beta Decay

abstract:
  We review recent developments in double-beta decay, focusing on what can be
learned about the three light neutrinos in future experiments. We examine the
effects of uncertainties in already measured neutrino parameters and in
calculated nuclear matrix elements on the interpretation of upcoming
double-beta decay measurements. We then review a number of proposed
experiments.


title: Accessing the Longitudinally Polarized Photon Content of the Proton

abstract:
  We investigate the QED Compton process (QEDCS) in longitudinally polarized
lepton-proton scattering both in the elastic and inelastic channels and show
that the cross section can be expressed in terms of the polarized equivalent
photon distribution of the proton. We provide the necessary kinematical
constraints to extract the polarized photon content of the proton using this
process at HERMES, COMPASS and eRHIC. We also discuss the suppression of the
major background process coming from virtual Compton scattering. We point out
that such an experiment can give valuable information on $g_1(x_B, Q^2)$ in the
small $x_B$, broad $Q^2$ region at the future polarized collider eRHIC and
especially in the lower $Q^2$, medium $x_B$ region in fixed target experiments.


title:
Exploring Final State Hadron Structure and SU(3) Flavor Symmetry
  Breaking Effects in D->PP and D->PV Decays

abstract:
  The nonleptonic two body decays $D\to PP$ and $D\to PV$ are investigated
based on the diagrammatic decomposition in a generalized factorization
formalism. It is shown that to fit the experimental data, the SU(3) flavor
symmetry breaking effects of the coefficients $a_i$s should be considered in
$D\to PP$ decay modes. In $D\to PV$ decays, the final state hadron structure
due to the pseudoscalar and vector mesons has more important effects on the
coefficients $a_i$s than the SU(3) symmetry breaking effects. It is found that
the nonfactorizable contributions as well as that of the exchange and
annihilation diagrams are significant in these decays.


title: High energy beta beams without massive detectors

abstract:
  In this paper, the possibility to exploit a high energy beta beam without
massive detectors is discussed. The radioactive ions are boosted up to very
high $\gamma$ with the neutrino beam pointing towards an instrumented surface
located at a moderate baseline (e.g. from CERN to the Gran Sasso Laboratories).
$\nu_e \to \nu_\mu$ oscillations and their CP conjugate are tagged as an excess
of horizontal muons produced in the rock and tracked by the low-mass
instrumented surface installed in one of the LNGS experimental halls. We show
that the performance of this complex for what concerns the determination of the
$\theta_{13}$ angle of the leptonic mixing matrix is comparable with the
current low-$\gamma$ design based on a gigantic water Cherenkov at Frejus.


title: Observation potential for eta_b at the Tevatron

abstract:
  We calculate the cross section for eta_b production at the Tevatron at
next-to-leading order in the strong coupling and find that more than two
millions of eta_b's are expected per inverse picobarn of integrated luminosity.
We discuss the decay modes into charmed states and suggest that the decays into
D* D(*) mesons might be the most promising channels to observe the eta_b in Run
II.


title: Searching for Composite Neutrinos in the Cosmic Microwave Background

abstract:
  We analyze signals in the Cosmic Microwave Background (CMB) in theories where
the small Dirac neutrino masses arise as a consequence of the compositeness of
right-handed neutrinos. In such theories, the right-handed neutrinos are
massless ``baryons'' of a new strong gauge interaction. We find that the
results crucially depend on whether or not the new strong sector undergoes
chiral symmetry breaking. In the case with chiral symmetry breaking, we find
that there are indeed signals in the CMB, but none of them is a direct
consequence of neutrino compositeness. In contrast, if the underlying theory
does not undergo chiral symmetry breaking, the large scattering cross-section
among the composites gives rise to a sizable CMB signal over a wide region of
the parameter space, and it can potentially probe whether the neutrino mass
spectrum is hierarchical, inverse hierarchical, or degenerate. We also discuss
collider constraints on the compositeness in the context of the CMB signals.


title: Compton Scattering in the Presence of Lorentz and CPT Violation

abstract:
  We examine the process of Compton scattering, in the presence of a Lorentz-
and CPT-violating modification to the structure of the electron. We calculate
the complete tree-level contribution to the cross section; our result is valid
to all orders in the Lorentz-violating parameter. We find a cross section that
differs qualitatively from the Klein-Nishina result at small frequencies, and
we also encounter a previously undescribed complication that will arise in the
calculation of many Lorentz-violation cross sections: The Lorentz violation
breaks the spin degeneracy of the external states, so we cannot use a closure
relation to calculate the unpolarized cross section.


title:
QCD Factorization for Spin-Dependent Cross Sections in DIS and Drell-Yan
  Processes at Low Transverse Momentum

abstract:
  Based on a recent work on the quantum chromodynamic (QCD) factorization for
semi-inclusive deep-inelastic scattering (DIS), we present a set of
factorization formulas for the spin-dependent DIS and Drell-Yan cross sections
at low transverse momentum.


title:
Prediction of the masses and decay processes of strange, charmed and
  bottomed pentaquarks from the linear molecular crypto-heptaquark model

abstract:
  In this paper the masses and decay processes of several new strange, charmed
and bottomed exotic pentaquarks are predicted. Multiquarks are studied
microscopically in a standard quark model. In pure ground-state pentaquarks the
short-range interaction is computed and it is shown to be repulsive. The
long-range and medium-range interactions are not expected to provide sufficient
attraction. An additional quark-antiquark pair is then considered, and this is
suggested to produce a narrow linear molecular system. The quarks assemble in
three hadronic clusters, and the central hadron provides stability. The
possible crypto-heptaquark hadrons with exotic pentaquark flavours, with any
number of strange, charmed and bottomed quarks, are listed. Several new exotics
may still be observed.


title: Baryonium with a phenomenological skyrmion-type potential

abstract:
  In this paper, we investigate the nucleon-antinucleon static energies in the
Skyrme model with the product {\it Anzatz}. The calculation shows that in the
ungroomed $S\bar S$ (skyrmion and antiskyrmion) channel, which leads to rapid
annihilation, there exists a quasi-stable bound state which may give a natural
explanation for the near-threshold enhancement in the proton-antiproton
$(p\bar{p})$ mass spectrum reported by the BES Collaboration and the Belle
Collaboration. Similar to the phenomenological well potential of the deuteron,
we construct a phenomenological skyrmion-type potential to study this narrow
$p\bar{p}$-resonance in $ J/\psi\to \gamma p\bar{p}$. By this potential model,
a $p\bar{p}$ baryonium with small binding energies is suggested and the decay
width of this state is calculated by WKB approximation. In this picture the
decay is attributed to quantum tunnelling and $p\bar{p}$ annihilation.
Prediction on the decay mode from the baryonium annihilation at rest is also
pointed out.


title: Neutrino Mixing and Quark-Lepton Complementarity

abstract:
  As a result of identification of the solution to the solar neutrino problem,
a rather precise relation theta_{sun} + theta_C = pi/4 between the leptonic 1-2
mixing angle theta_{sun} and the Cabibbo angle has emerged. It would mean that
the lepton and the quark mixing angles add up to the maximal, suggesting a deep
structure by which quarks and leptons are interrelated. We refer the relation
``quark-lepton complementarity'' (QLC) in this paper. We formulate general
conditions under which the QLC relation is realized. We then present several
scenarios which lead to the relation and elaborate on phenomenological
consequences which can be tested by the future experiments. We also discuss
implications of the QLC relation for the quark-lepton symmetry and the
mechanism of neutrino mass generation.


title: Problems of vacuum energy and dark energy

abstract:
  A simple description of the vacuum energy (cosmological constant) problem for
non-experts is presented. Basic features of cosmology with non-zero vacuum
energy are discussed. The astronomical data which indicate that the universe is
filled with an anti-gravitating state of matter are described. The mechanisms
which may lead to cancellation of almost infinite vacuum energy down to the
astronomically observed value are discussed. The idea of dynamical adjustment
is considered in some more detail.


title: Sterile neutrinos: from cosmology to experiments

abstract:
  We analyze the oscillation signals generated by one extra sterile neutrino.
We fully take into account the effects of the established oscillations among
active neutrinos. We analyze the effects in solar, atmospheric, reactor and
beam experiments, cosmology and supernov\ae. We analyze the impact of the LSND
anomaly on cosmology showing, in the full 4 neutrino context, that it is not
compatible with standard cosmology. We identify the still allowed regions of
the parameter space, outlining which are the future experiments which can
improve the bounds.


title: Flavour Physics and CP Violation

abstract:
  The starting point of these lectures is an introduction to the weak
interactions of quarks and the Standard-Model description of CP violation,
where the key element is the Cabibbo--Kobayashi--Maskawa matrix and the
corresponding unitarity triangles. Since the B-meson system will govern the
stage of (quark) flavour physics and CP violation in this decade, it will be --
after a brief look at the kaon system -- our main focus. We shall classify
B-meson decays, introduce the theoretical tools to deal with them, explore the
requirements for non-vanishing CP-violating asymmetries, and discuss
B^0_q--B^0_q_bar mixing (q={d,s}). We will then turn to B-factory benchmark
modes, discuss the physics potential of B^0_s mesons, which is particularly
promising for B-decay experiments at hadron colliders, and emphasize the
importance of studies of rare decays, which are absent at the tree level in the
Standard Model, complement nicely the studies of CP violation, and provide
interesting probes for new physics.


title: Thermal leptogenesis with triplet Higgs boson and mass varying neutrinos

abstract:
  We study the thermal leptogenesis in the scenario where the standard model is
extended to include one $SU(2)_{L}$ triplet Higgs boson, in addition to three
generations of the right-handed neutrinos. And in the model we introduce the
coupling between the Quintessence and the right-handed neutrinos, the triplet
Higgs boson, so that the light neutrino masses vary during the evolution of the
universe. Assuming that the lepton number asymmetry is generated by the decays
of the lightest right-handed neutrino $N_{1}$, we find the thermal leptogenesis
can be characterized by four model independent parameters. In the case where
the contribution of the triplet Higgs to the lepton asymmetry is dominant, we
give the relation between the minimal $M_{1}$ and the absolute mass scale
$\bar{m}$ of the light neutrinos, by solving the Boltzmann equations
numerically. We will also show that with the varying neutrino masses, the
reheating temperature can be lowered in comparison with the traditional thermal
leptogenesis.


title: Type II Leptogenesis and the Neutrino Mass Scale

abstract:
  We discuss the effect of the neutrino mass scale on baryogenesis via the
out-of-equilibrium decay of the lightest right-handed (s)neutrinos in type II
see-saw models. We calculate the type II contributions to the decay asymmetries
for minimal scenarios based on the Standard Model and on the Minimal
Supersymmetric Standard Model, where the additional direct mass term for the
neutrinos arises from a Higgs triplet vacuum expectation value. The result in
the supersymmetric case is new and we correct the previous result in the
scenario based on the Standard Model. We confirm and generalize our results by
calculating the decay asymmetries in an effective approach, which is
independent of the realization of the type II contribution. We derive a general
upper bound on the decay asymmetry in type II see-saw models and find that it
increases with the neutrino mass scale, in sharp contrast to the type I case
which leads to an upper bound of about 0.1 eV on the neutrino mass scale. We
find a lower bound on the mass of the lightest right-handed neutrino,
significantly below the corresponding type I bound for partially degenerate
neutrinos. This lower bound decreases with increasing neutrino mass scale,
making leptogenesis more consistent with the gravitino constraints in
supersymmetric models.


title: Phenomenology of Higgsless Electroweak Symmetry Breaking

abstract:
  It is possible to construct models based on warped extra dimensions in which
electroweak symmetry breaking takes place without the introduction of any Higgs
fields. This breaking can occur through the judiciuous choice of boundary
conditions applied to gauge fields living in the bulk. One then finds that the
fifth components of these bulk fields act as the Goldstone bosons, even for the
would-be zero modes of the Kaluza-Klein tower. In this talk I will discuss the
phenomenology of such scenarios, in particular, the problems associated with
the construction of realistic models due to the simultaneous constraints
imposed by precision electroweak data, present collider search limits and the
requirement of perturabtive unitarity in $W_L^+W_L^-$ elastic scattering.
Future collider signatures for such scenarios are also discussed.


title: Flavour Symmetries and Kahler Operators

abstract:
  Any supersymmetric mechanism to solve the flavour puzzle would generate
mixing both in the superpotential Yukawa couplings and in the Kahler potential.
In this paper we study, in a model independent way, the impact of the
nontrivial structure of the Kahler potential on the physical mixing matrix,
after kinetic terms are canonically normalized. We undertake this analysis both
for the quark sector and the neutrino sector. For the quark sector, and in view
of the experimental values for the masses and mixing angles, we find that the
effects of canonical normalization are subdominant. On the other hand, for the
leptonic sector we obtain different conclusions depending on the spectrum of
neutrinos. In the hierarchical case we obtain similar conclusion as in the
quark sector, whereas in the degenerate and inversely hierarchical case,
important changes in the mixing angles could be expected.


title: Quark Distributions in a Medium

abstract:
  We derive the formal expressions needed to discuss the change of the
twist-two parton distribution functions when a hadron is placed in a medium
with relativistic scalar and vector mean fields


title: The New Minimal Standard Model

abstract:
  We construct the New Minimal Standard Model that incorporates the new
discoveries of physics beyond the Minimal Standard Model (MSM): Dark Energy,
non-baryonic Dark Matter, neutrino masses, as well as baryon asymmetry and
cosmic inflation, adopting the principle of minimal particle content and the
most general renormalizable Lagrangian. We base the model purely on empirical
facts rather than aesthetics. We need only six new degrees of freedom beyond
the MSM. It is free from excessive flavor-changing effects, CP violation,
too-rapid proton decay, problems with electroweak precision data, and unwanted
cosmological relics. Any model of physics beyond the MSM should be measured
against the phenomenological success of this model.


title:
Loop integration results using numerical extrapolation for a non-scalar
  integral

abstract:
  Loop integration results have been obtained using numerical integration and
extrapolation. An extrapolation to the limit is performed with respect to a
parameter in the integrand which tends to zero. Results are given for a
non-scalar four-point diagram. Extensions to accommodate loop integration by
existing integration packages are also discussed. These include: using
previously generated partitions of the domain and roundoff error guards.


title: New results on the limit for the width of the exotic Theta^+ resonance

abstract:
  We investigate the impact of the \Theta^+(1540) resonance on differential and
integrated cross sections for the reaction K^+d{\to}K^0pp, where experimental
information is available at kaon momenta below 640 MeV/c. The calculation
utilizes the J\"ulich KN model and extensions of it that include contributions
from a \Theta^+(1540) state with different widths. The evaluation of the
reaction K^+d{\to}K^0pp takes into account effects due to the Fermi motion of
the nucleons within the deuteron and the final three-body kinematics. We
conclude that the available data constrain the width of the \Theta^+(1540) to
be less than 1 MeV.


title: Delineating the (Un)polarized Photon Content of the Nucleon

abstract:
  We investigate the QED Compton process (both elastic and inelastic) in
unpolarized and longitudinally polarized electron-proton scattering. The cross
section can be expressed in terms of the equivalent photon distribution of the
proton. We provide the necessary kinematical cuts to extract the photon content
of the proton at HERMES and eRHIC. We point out that such a process can give
valuable information on $g_1(x_B, Q^2)$ in the small $x_B$, broad $Q^2$ region
at eRHIC and especially in the lower $Q^2$, medium $x_B$ region in fixed target
experiments.


title:
Induced photon emission from quark jets in ultrarelativistic heavy-ion
  collisions

abstract:
  We study the induced photon bremsstrahlung from a fast quark produced in
AA-collisions due to multiple scattering in quark-gluon plasma. For RHIC and
LHC conditions the induced photon spectrum is sharply peaked at photon energy
close to the initial quark energy. In this region the contribution of the
induced radiation to the photon fragmentation function exceeds the ordinary
vacuum radiation. Contrary to previous analyses our results show that at RHIC
and LHC energies the final-state interaction effects in quark-gluon plasma do
not suppress the direct photon production, and even may enhance it at p_{T}
about 5-15 GeV.


title: Nuclear effects in polarized proton-deuteron Drell-Yan processes

abstract:
  The longitudinally polarized Drell-Yan process is one of most powerful tools
to probe the structure of hadrons. By means of the recent formalism of the
polarized proton-deuteron(pd) Drell-Yan, we calculate the ratio of the
proton-deuteron Drell-Yan cross section to the proton-proton(pp) one
$\Delta\sigma_{pd}/2\Delta\sigma_{pp}$in the polarized case.The theoretical
results can be compared with future experimental data to confirm the nuclear
effect due to the six-quark cluster in deuteron .


title: Non-Gaussian perturbations in hybrid inflation

abstract:
  We consider second order inflationary perturbations in the case of two scalar
fields, $\sigma$ and the inflaton $\phi$. We derive an expression for the
non-Gaussianity of perturbations and apply the results to hybrid inflation. We
isolate the contributions due to $\sigma$ and evaluate the resulting terms to
show that $\sigma$-induced non-Gaussianities dominate over inflaton-induced
non-Gaussianities when $m^2_{\sigma} \gtrsim \eta H^2$, where $\eta$ is the
slow-roll parameter. This may provide a useful test of hybrid inflation in
forthcoming CMB experiments.


title:
Tests of Classical Gravity Description for Microscopic Black Hole
  Production

abstract:
  The classical Einstein gravity description of black hole production in
transplanckian collisions in TeV-scale gravity is tested for self-consistency.
In addition to the "curvature must be small" test, which was shown to be
violated in [hep-ph/0401116], it is proposed to estimate quantum fluctuations
in the Aichelburg-Sexl shock waves corresponding to the colliding particles.
Using linearized quantum gravity, it is found that the occupation numbers of
gravitons with characteristic frequency are too small to resolve the classical
width of the shocks. This raises further doubts in the classical gravity
picture of black hole creation and the geometric cross section estimate based
on it.


title: The Physics Case for an e^+ e^- Super B-Factory

abstract:
  I share some personal reflections about the physics potential and the physics
case that can be made for an e^+ e^- high-luminosity B-meson factory, as
presented in my summary talk at the recent "Super B-Factory Workshop" jointly
organized by the BaBar and Belle Collaborations (Honolulu, Hawaii, January
2004). These brief remarks will appear as part of a forthcoming, comprehensive
report on the physics potential of such a ``10^{36} machine''.


title: Exlusive charmed meson pair production

abstract:
  The experimental data of BELLE Collaboration on the exclusive charmed meson
pair production in the process of monophotonic $e^+e^-$-annihilation
($e^+e^-\to \gamma^* \to D\bar D$) has been studied. It has been shown that
these data is described satisfactorily in the frame work of constituent quark
model. Our studies have demonstrated that the central production process
$e^+e^-\to e^+e^-\gamma\gamma \to e^+e^-D\bar D +X$ and the process of
monophotonic $e^+e^-$-annihilation yield comparable numbers of the charmed
meson pairs.


title: Efficient solar anti-neutrino production in random magnetic fields

abstract:
  We have shown that the electron anti-neutrino appearance in the framework of
the spin flavor conversion mechanism is much more efficient in the case of
neutrino propagation through random than regular magnetic field. This result
leads to much stronger limits on the product of the neutrino transition
magnetic moment and the solar magnetic field based on the recent KamLAND data.
We argue that the existence of the random magnetic fields in the solar
convective zone is a natural sequence of the convective zone magnetic field
evolution.


title: B_s-anti-B_s Mixing in Z' Models with Flavor-Changing Neutral Currents

abstract:
  In models with an extra U(1)' gauge boson family non-universal couplings to
the weak eigenstates of the standard model fermions generally induce
flavor-changing neutral currents. This phenomenon leads to interesting results
in various B meson decays, for which recent data indicate hints of new physics
involving significant contributions from b -> s transitions. We analyze the B_s
system, emphasizing the effects of a Z' on the mass difference and CP
asymmetries.


title: Electroweak Supersymmetry with an Approximate U(1)_PQ

abstract:
  A predictive framework for supersymmetry at the TeV scale is presented, which
incorporates the Ciafaloni-Pomarol mechanism for the dynamical determination of
the \mu parameter of the MSSM. It is replaced by (\lambda S), where S is a
singlet field, and the axion becomes a heavy pseudoscalar, G, by adding a mass,
m_G, by hand. The explicit breaking of Peccei-Quinn (PQ) symmetry is assumed to
be sufficiently weak at the TeV scale that the only observable consequence is
the mass m_G. Three models for the explicit PQ breaking are given; but the
utility of this framework is that the predictions for all physics at the
electroweak scale are independent of the particular model for PQ breaking. Our
framework leads to a theory similar to the MSSM, except that \mu is predicted
by the Ciafaloni-Pomarol relation, and there are light, weakly-coupled states
in the spectrum. The production and cascade decay of superpartners at colliders
occurs as in the MSSM, except that there is one extra stage of the cascade
chain, with the next-to-LSP decaying to its "superpartner" and \tilde{s},
dramatically altering the collider signatures for supersymmetry. The framework
is compatible with terrestrial experiments and astrophysical observations for a
wide range of m_G and <s>. If G is as light as possible, 300 keV < m_G < 3 MeV,
it can have interesting effects on the radiation energy density during the
cosmological eras of nucleosynthesis and acoustic oscillation, leading to
predictions for N_{\nu BBN} and N_{\nu CMB} different from 3.


title: Very Constrained Minimal Supersymmetric Standard Models

abstract:
  We consider very constrained versions of the minimal supersymmetric extension
of the Standard Model (VCMSSMs) which, in addition to constraining the scalar
masses m_0 and gaugino masses m_{1/2} to be universal at some input scale,
impose relations between the trilinear and bilinear soft supersymmetry breaking
parameters A_0 and B_0. These relations may be linear, as in simple minimal
supergravity models, or nonlinear, as in the Giudice-Masiero mechanism for
generating the Higgs-mixing mu term. We discuss the application of the
electroweak vacuum conditions in VCMSSMs, which may be used to make a
prediction for tan beta as a function of m_0 and m_{1/2} that is usually
unique. We baseline the discussion of the parameter spaces allowed in VCMSSMs
by updating the parameter space allowed in the CMSSM for fixed values of tan
beta with no relation between A_0 and B_0 assumed {\it a priori}, displaying
contours of B_0 for a fixed input value of A_0, incorporating the latest CDF/D0
measurement of m_t and the latest BNL measurement of g_mu - 2. We emphasize
that phenomenological studies of the CMSSM are frequently not applicable to
specific VCMSSMs, notably those based on minimal supergravity, which require
m_0 = m_{3/2} as well as A_0 = B_0 + m_0. We then display (m_{1/2}, m_0) planes
for selected VCMSSMs, treating in a unified way the parameter regions where
either a neutralino or the gravitino is the LSP. In particular, we examine in
detail the allowed parameter space for the Giudice-Masiero model.


title: Predictions for $e^+e^-\to J/\psi \eta_c$ with Light-Cone Wave-Functions

abstract:
  Predictions for $e^+e^-\to J/\psi \eta_c$ from previous studies are made by
taking charmonia as a nonrelativistic bound state and by using nonrelativistic
QCD(NRQCD) approach. The predicted cross-section is smaller by an order of
magnitude than the experimentally observed. We study the process by taking
charm quark as a light quark and use light-cone wave-functions to parameterize
nonperturbative effects related to charmonia. The total cross section of
$e^+e^-\to J/\psi \eta_c$ can be predicted, if these wave-functions are known.
Motivated by studies of light-cone wave-functions of light hadrons, we make a
reasonable assumption of the forms of light-cone wave-functions. With these
light-cone wave-functions we can obtain the cross section which is more closer
to the experimentally observed than that from NRQCD approach. We also discuss
in detail the difference between two approaches.


title:
Decay Constants of Heavy Meson of $0^-$ State in Relativistic Salpeter
  Method

abstract:
  The decay constants of pseudoscalar heavy mesons of $0^-$ state are computed
by means of the relativistic (instantaneous) Salpeter equation. We solved the
full Salpeter equation without making any further approximation, such as
ignoring the small component wave function. Therefore, our results for the
decay constants include the complete relativistic contributions from the light
and the heavy quarks. We obtain $F_{D_s} \approx 248 \pm 27 $, $F_{D} \approx
230 \pm 25 (D^0,D^\pm)$, $F_{B_s} \approx 216 \pm 32 $, $F_{B} \approx 196 \pm
29 (B^0,B^\pm)$, $F_{B_c} \approx 322 \pm 42 $ and $F_{\eta_c} \approx 292 \pm
25 $ MeV.


title: Energy Loss Effect in High Energy Nuclear Drell-Yan Process

abstract:
  The energy loss effect in nuclear matter, which is another nuclear effect
apart from the nuclear effect on the parton distribution as in deep inelastic
scattering process, can be measured best by the nuclear dependence of the high
energy nuclear Drell-Yan process. By means of the nuclear parton distribution
studied only with lepton deep inelastic scattering experimental data, measured
Drell-Yan production cross sections for 800GeV proton incident on a variety of
nuclear targets are analyzed within Glauber framework which takes into account
energy loss of the beam proton. It is shown that the theoretical results with
considering the energy loss effect are in good agreement with the FNAL E866.


title: Chemical Equilibration in Relativistic Heavy Ion Collisions

abstract:
  In the hadronic sector of relativistic heavy ion physics, the $\rho <=> 2\pi$
reaction is the strongest one, strong enough to equilibrate the $\rho$ with the
pions throughout the region from chemical freezeout to thermal freezeout when
free-particle interactions (with no medium-dependent effects) are employed.
Above the chiral restoration temperature, only $\rho$'s and $\pi$'s are
present, in that the chirally restored $A_1$ is equivalent to the $\rho$ and
the mesons have an SU(4) symmetry, with no dependence on isospin and negligible
dependence on spin. In the same sense the $\sigma$ and $\pi$ are "equivalent"
scalars. Thus the chirally restored $\rho\leftrightarrows 2\pi$ exhaust the
interspecies transitions. We evaluate this reaction at $T_c$ and find it to be
much larger than below $T_c$, certainly strong enough to equilibrate the
chirally restored mesons just above $T_c$. When emitted just below $T_c$ the
mesons remain in equilibrium, at least in the chiral limit because of the
Harada-Yamawaki "vector manifestation" that requires that mesonic coupling
constants go to zero (in the chiral limit) as $T$ goes to $T_c$ from below. Our
estimates in the chiral limit give deviations in some particle ratios from the
standard scenario (of equilibrium in the hadronic sector just below $T_c$) of
about double those indicated experimentally. This may be due to the neglect of
explicit chiral symmetry breaking in our estimates. We also show that the
instanton molecules present above $T_c$ are the giant multipole vibrations
found by Asakawa, Hatsuda and Nakahara and of Wetzorke et al. in lattice gauge
calculations. Thus, the matter formed by RHIC can equivalently be called:
chirally restored mesons, instanton molecules, or giant collective vibrations.
It is a strongly interacting liquid.


title: Black Holes versus Strange Quark Matter

abstract:
  Interpretation of Centauro like events still remains the open question. To
the list of models proposed to explain Centauros, the new idea based on mini
black holes evaporation has been recently added by A. Mironov et al.. In our
paper we give some comments to this scenario, showing that the hypothesis that
Centauro like events result from decay of mini black holes, encounters various
difficulties, when compared with experimental observations. The QGP strangelet
mechanism, proposed in some of our papers, offers better description.


title:
Density saturation and the decrease of the normalised width of the
  multiplicity distribution in high energy pp collisions

abstract:
  It is experimentally observed that the width of the KNO multiplicity
distribution --or the negative binomial parameter 1/k-- for pp collisions, in
the energy region 10 to 1800 GeV, is an increasing function of the energy. We
argue that in models with parton or string saturation such trend will necessary
change: at some energy the distribution will start to become narrower. In the
framework of percolating strings, we have estimated the change to occur at an
energy of the order of 5--10 TeV.


title:
The observation of the second nonet of tensor mesons with the L3
  experiment

abstract:
  This paper was withdrawn by arXiv administrators upon request of the
Chairperson and Spokesperson of the L3 Collaboration.


title: Understanding I=2 pi-pi Interaction

abstract:
  A correct understanding and description of the I=2 pi-pi S-wave interaction
is important for the extraction of the I=0 pi-pi S-wave interaction from
experimental data and for understanding the I=0 pi-pi S-wave interaction
theoretically. With t-channel rho, f2(1270) exchange and the pi pi -> rho rho
-> pi pi box diagram contribution, we reproduce the pi-pi isotensor S-wave and
D-wave scattering phase shifts and inelasticities up to 2.2 GeV quite well in a
K-matrix formalism.


title:
The Lorentz and CPT violating effects on the charged Higgs boson decays
  H^+ -> W^+ H^0 (h^0,A^0)

abstract:
  We study the decay widths of the processes H^+\to W^+ H^0 (h^0,A^0),
including the Lorentz violating effects and analyze the possible CPT violating
asymmetry arising from CPT odd coefficients. We observe that these effects are
too small to be detected, since the corresponding coefficients are highly
suppressed at the low energy scale.


title: Little Higgs and precision electroweak tests

abstract:
  I consider the low energy limit of Little Higgs models. The method consists
in eliminating the heavy fields using their classical equations of motion in
the infinite mass limit. After the elimination of the heavy degrees of freedom
one can directly read off deviations from the precision electroweak data. I
also examine the effects on the low energy precision experiments.


title: A Scaling Law for Quark Masses and the CKM matrix

abstract:
  We have recently argued that quark masses may follow a simple scaling law. In
this paper we build a simple mass matrix for quarks that can reproduce the
scaling law expression. The simple mass matrices of the model are then
generalized through general rotations in the flavor space, including phase
transformations. In turn they will be used to construct the quark-mixing
matrix. It has been found that the model can predict the entries of the $CKM$
matrix in excellent agreement with current values. We give precise values for
the light quark masses and determine the magnitude of the CP violation and also
the quark-mixing angles in the flavor space. The main motivation behind this
work is to relate the scaling law predictions with quark-mixing, through a
simple mass matrix and its generalized Hermitian form.


title: Recent Theoretical Developments in B -> X_s l^+ l^- Decays

abstract:
  We present a concise review of the theoretical status of the rare
semileptonic B -> X_s l^+ l^- decays in the standard model. Particular
attention is thereby devoted to the recent theoretical progress concerning, on
the one hand the next-to-next-to-leading order QCD calculation and, on the
other hand the analysis of phenomenological important subleading electroweak
effects.


title:
Quantum Corrections to Thermodynamic Properties in the Large $N_f$ Limit
  of the Quark Gluon Plasma

abstract:
  In this doctoral thesis we present the exact large $N_f$ calculation at
next-to-leading order of the thermal interaction pressure of deconfined QCD for
small and large quark chemical potential where the presence of the Landau pole
is negligible numerically. For small values of the coupling we compare our
results to existing perturbative results in the literature. Our numerical
accuracy allows us to verify and even improve some of the existing perturbative
coefficients by Freedman and McLerran for zero temperature or by Vuorinen for
finite chemical potential and for linear and non-linear quark number
susceptibilities, and to predict new coefficients to the sixth order in the
coupling numerically that have not been calculated analytically yet. For larger
couplings we determine where perturbation theory ceases to be applicable.
  For large chemical potential and small temperatures we enter the range of a
so-called non-Fermi liquid, which in contrast to a classical Fermi liquid is
dominated by long-range quasi-static transverse gauge-boson interactions. In
this limit, we complete the previously known leading $T\ln T^{-1}$ contribution
to the specific heat, and also go beyond this order to find a series involving
anomalous fractional powers $T^{(3+2n)/3}$ caused by dynamical screening. We
calculate their coefficients analytically up to order $T^{7/3}$ and find that
these contributions determine the leading anomalous contribution in full QED
and QCD (i.e. at finite $N_f$).


title: Effective theory approach to unstable particles

abstract:
  We present a novel treatment of resonant massive particles appearing as
intermediate states in high energy collisions. The approach uses effective
field theory methods to treat consistently the instability of the intermediate
resonant state. As a result gauge invariance is respected in every step and
calculations can in principle be extended to all orders in perturbation theory,
the only practical limitation in going to higher orders being the standard
difficulties related to multi-loop integrals. We believe that the longstanding
problem related to the treatment of instability of particles is now solved.


title: Matter in extremis: ultrarelativistic nuclear collisions at RHIC

abstract:
  We review the physics of nuclear matter at high energy density and the
experimental search for the Quark-Gluon Plasma at the Relativistic Heavy Ion
Collider (RHIC). The data obtained in the first three years of the RHIC physics
program provide several lines of evidence that a novel state of matter has been
created in the most violent, head-on collisions of $Au$ nuclei at
$\sqrt{s}=200$ GeV. Jet quenching and global measurements show that the initial
energy density of the strongly interacting medium generated in the collision is
about two orders of magnitude larger than that of cold nuclear matter, well
above the critical density for the deconfinement phase transition predicted by
lattice QCD. The observed collective flow patterns imply that the system
thermalizes early in its evolution, with the dynamics of its expansion
consistent with ideal hydrodynamic flow based on a Quark-Gluon Plasma equation
of state.


title:
S-D mixing and $\psi(3770)$ production in $e^+e^-$ annihilation and B
  decay and its radiative transitions

abstract:
  The large decay rate observed by Belle for $B^+\to\psi(3770)K^+$, which is
comparable to $B^+\to\psi(3686)K^+$, might indicate either an unexpectedly
large S-D mixing angle $|\theta|\approx 40^o$ or the leading role of the
color-octet mechanism in D-wave charmonium production in B decay. By
calculating the production rate of $\psi(3770)$ in the continuum $e^+e^-$
annihilation at $\sqrt{s}=10.6$ GeV with these two possible approaches (i.e.
the large S-D mixing and the color-octet mechanism), we show that the
measurement for this process at Belle and BaBar may provide a clear cut
clarification for the two approaches. In addition, the radiative E1 transition
ratio $\Gamma(\psi(3770)\to \gamma\chi_{c2})/\Gamma(\psi(3770)\to
\gamma\chi_{c1})$ may dramatically change from $\sim$ 0.04 (for $\theta\approx
0^o$) to $\sim$ 200 (for $\theta\approx -40^o$) due to the large S-D
interference effect, thus the E1 transition measurement of $\psi(3770)$ at BES
and CLEO-c will also be very useful in clarifying this issue.


title: Running Coupling with Minimal Length

abstract:
  In models with large additional dimensions, the GUT scale can be lowered to
values accessible by future colliders. Due to modification of the loop
corrections from particles propagating into the extra dimensions, the
logarithmic running of the couplings of the Standard Model is turned into a
power law. These loop-correction are divergent and the standard way to achieve
finiteness is the introduction of a cut-off. The question remains, whether the
results are reliable as they depend on an unphysical parameter.
  In this paper, we show that this running of the coupling can be calculated
within a model including the existence of a minimal length scale. The minimal
length acts as a natural regulator and allows us to confirm cut-off
computations.


title: Propagators of light scalar mesons

abstract:
  For the first time, as far as we know, in field theory are found explicit
forms of propagators satisfying the K\"allen -- Lehmann representation. To be
exact, it is shown that scalar meson propagators, taking into account a virtual
intermediate state contribution to the resonance self-energy, satisfy the
K\"allen -- Lehmann representation in the wide domain of coupling constants of
the light scalar mesons with the two-particle states. It is proposed to use
these propagators in routine fitting data about light scalar mesons to reveal
physics underlying the light scalar mesons.


title:
Manifestation of the $a^0_0(980)-f_0(980)$ mixing in the reaction
  $\pi^-p\to\eta\pi^0n$ on a polarized target

abstract:
  It is argued that the single-spin asymmetry in the reaction $\pi^-p\to
a_0^0(980)n\to(\eta\pi^0)_S n$ is extremely sensitive to the mixing of the
$a^0_0(980)$ and $f_0(980)$ resonances. It is shown that at low momentum
transfers (namely, in any one of the intervals $0\leq-t\leq0.025,...,0.1$
GeV$^2$) the normalized asymmetry, which can take the values from -1 to 1, must
undergo a jump in magnitude close to 1 in the $\eta\pi^0$ invariant mass region
between 0.965 GeV and 1.01 GeV. The strong asymmetry jump is the
straightforward manifestation of the $a^0_0(980)-f_0(980)$ mixing. For
observing the jump, any very high quality $\eta\pi^0$ mass resolution is not
required. The energy dependence of the polarization effect is expected to be
rather weak. Therefore, it can be investigated at any high energy, for example,
in the range from eight to 100 GeV.


title: How accurately can we measure the W cross section?

abstract:
  We study the QCD sources of systematic uncertainties in the experimental
extraction of the W cross section at hadron colliders. The uncertainties appear
in the evaluation of the detector acceptances used to convert the number of
observed events into a total production cross section. We consider the effect
of NLO corrections, as well as of the inclusion of parton showers, and evaluate
the impact of spin correlations and of PDF and scale uncertainties.


title: The Effect of Supersymmetric CP Phases on qq-bar Annihilations

abstract:
  We compute the rates for $q \bar{q}$ annihilation into charginos and
neutralinos by taking into account the effects of supersymmetric soft phases.
In particular, the phase of the $\mu$ parameter gains direct accessibility via
the production of dissimilar charginos and neutralinos. The phases of the
trilinear soft masses do not have a significant effect on the cross sections.
Our results can be important for sparticle searches at the LHC.


title: Waiting for Precise Measurements of K^+->pi^+ nu nu and K_L->pi^0 nu nu

abstract:
  In view of future plans for accurate measurements of the theoretically clean
branching ratios Br(K+ -> pi+ nu nu) and Br(KL -> pi0 nu nu), that should take
place in the next decade, we collect the relevant formulae for quantities of
interest and analyze their theoretical and parametric uncertainties. We point
out that in addition to the angle beta in the unitarity triangle (UT) also the
angle gamma can in principle be determined from these decays with respectable
precision and emphasize in this context the importance of the recent NNLO QCD
calculation of the charm contribution to K+ -> pi+ nu nu and of the improved
estimate of the long distance contribution by means of chiral perturbation
theory. In addition to known expressions we present several new ones that
should allow transparent tests of the Standard Model (SM) and of its
extensions. While our presentation is centered around the SM, we also discuss
models with minimal flavour violation and scenarios with new complex phases in
decay amplitudes and meson mixing. We give a brief review of existing results
within specific extensions of the SM, in particular the Littlest Higgs Model
with T-parity, Z' models, the MSSM and a model with one universal extra
dimension. We derive a new "golden" relation between B and K systems that
involves (beta,gamma) and Br(KL -> pi0 nu nu) and investigate the virtues of
(R_t,beta), (R_b,gamma), (beta,gamma) and (etabar,gamma) strategies for the UT
in the context of K -> pi nu nu decays with the goal of testing the SM and its
extensions.


title:
Consistency of cosmic strings with cosmic microwave background
  measurements

abstract:
  In the context of SUSY GUTs, GUT scale cosmic strings formed at the end of
hybrid inflation are compatible with currently available CMB measurements. The
maximum allowed cosmic strings contribution to the CMB data constrains the free
parameters (mass scales, couplings) of inflationary models. For F-term
inflation either the superpotential coupling must be fine tuned or one has to
invoke the curvaton mechanism. D-term inflation should be addressed in the
framework of SUGRA. We find that the cosmic strings contribution is not
constant, contrary to some previous results. Using CMB measurements we
constrain the gauge and the superpotential couplings.


title: Polarization in B->VV Decays

abstract:
  Factorizable amplitudes in B decays to light vector meson pairs give a
longitudinal polarization satisfying 1- f_L =O(1/m_b^2). This remains formally
true when non-factorizable graphs are included in QCD factorization, and is
numerically realized in B->Rho Rho. In \Delta S=1 decays a QCD penguin
annihilation graph can effectively contribute at leading power to the
transverse and longitudinal amplitudes. The observed longitudinal polarization,
f_L (B->phi K^*) \approx 50%, can therefore be accounted for in the SM. The
ratio of perpendicular to parallel transverse rates provides a sensitive test
for new right-handed currents. The transverse b->sg dipole operator amplitudes
are highly suppressed. CP violation measurements can therefore discriminate
between new contributions to the dipole and four quark operators. SU(3)_F
violation in QCD penguin amplitudes can easily be O}(1), in general, due to
annihilation. Implications for B->Rho K^* polarization and New Physics searches
are pointed out.


title: Charge and Isospin Fluctuations in High Energy pp-Collisions

abstract:
  Charge and isospin event-by-event fluctuations in high-energy pp-collisions
are predicted within the Unitary Eikonal Model, in particular the fluctuation
patterns of the ratios of charged-to-charged and neutral-to-charged pions.
These fluctuations are found to be sensitive to the presence of unstable
resonances, such as $\rho $ and $\omega $ mesons. We predict that the
charge-fluctuation observable $D_{UEM}$ should be restricted to the interval
$8/3\le D_{UEM}\le 4$ depending on the $\rho /\pi $ production ratio. Also, the
isospin fluctuations of the DCC-type of the ratio of neutral-to-charged pions
are suppressed if pions are produced together with $\rho $ mesons.


title: Decays of supernova relic neutrinos

abstract:
  We propose that future observations of supernova relic neutrinos (SRN) can be
used to probe neutrino decay models. We focus on invisible (e.g. Majoron)
decays, and work out the general solution of SRN kinetic equations in the
presence of oscillations plus decay. We then apply the general solution to
specific decay scenario, and show that the predicted SRN event rate can span
the whole range below the current experimental bounds. Therefore, future SRN
observations will surely have an impact on the neutrino decay parameter space.


title: Electron Self Energy for Higher Excited S Levels

abstract:
  A nonperturbative numerical evaluation of the one-photon electron self energy
for the 3S and 4S states with charge numbers Z=1 to 5 is described. The
numerical results are in agreement with known terms in the expansion of the
self energy in powers of Zalpha.


title: Decays of MSSM Higgs in Flavour-Changing Quark Channels

abstract:
  We compute the genuine SUSY one-loop quantum contributions to
flavour-changing MSSM Higgs-boson decays into $b \bar s$ and $s \bar b$ using
the full diagrammatic approach that is valid for all $\tan \beta$ values and do
not rely on the mass-insertion approximation for the characteristic
flavour-changing parameter. We analyze in full detail the dependence of these
flavour-changing partial widths on all the relevant MSSM parameters and also
study the non-decoupling behaviour of these widths with the SUSY mass
parameters. We find that these contributions are sizable as compared to the SM
ones, and can be very efficient as an indirect method in the future search for
Supersymmetry.


title: Geoneutrino Analysis in KamLAND: Input and Desiderata

abstract:
  The Kamioka Liquid scintillator Anti-Neutrino Detector (KamLAND) is
collecting antineutrino events generated by nuclear reactors and by Thorium and
Uranium decay in the Earth interior. We comment on a systematic approach to the
evaluation of the geo-neutrino contribution and of its uncertainties in
KamLAND, taking into account geophysical and geochemical indications,
estimates, and data. The results can help to improve both the neutrino
oscillation analysis and the knowledge of the Earth interior. Input and
desiderata for future geoneutrino analyses are identified.


title: Novel Opportunities for EW Breaking from Low-Scale SUSY Breaking

abstract:
  In supersymmetric scenarios with a low scale of SUSY breaking
[sqrt{F}=O(TeV)] the conventional MSSM Higgs sector can be substantially
modified, mainly because the Higgs potential contains additional effective
quartic terms. The Higgs spectrum can be dramatically changed, and the lightest
state can be much heavier than in usual SUSY scenarios. Novel opportunities for
electroweak breaking arise, and the electroweak scale may be obtained in a less
fine-tuned way for wide ranges of tan(beta) and the Higgs mass, offering a
possible solution to the MSSM fine-tuning problem.


title: New Matter Effects in Neutrino Oscillation Experiments

abstract:
  Consequences of a new force mediated by a light scalar particle for neutrino
oscillation experiments are considered. Such a force could give rise to
neutrino masses and mixings whose matter dependence is much more significant
than the MSW effect. We consider the effects of such a new force on the limits
derived from oscillation experiments, and examine how the constraints on
neutrino models are altered. Re-analysis of neutrino data, as well as new
experiments in which large matter effects are systematically explored, is
required to directly probe such physics beyond the standard model.


title:
Dynamical Fermion Masses and Constraints of Gauge Invariance in Quenched
  QED3

abstract:
  Numerical study of the Schwinger-Dyson equation (SDE) for the fermion
propagator (FP) to obtain dynamically generated chirally asymmetric solution in
an arbitrary covariant gauge $\xi$ is a complicated exercise specially if one
employs a sophisticated form of the fermion-boson interaction complying with
the key features of a gauge field theory. However, constraints of gauge
invariance can help construct such a solution without having the need to solve
the Schwinger-Dyson equation for every value of $\xi$. In this article, we
propose and implement a method to carry out this task in quenched quantum
electrodynamics in a plane (QED3). We start from an approximate analytical form
of the solution of the SDE for the FP in the Landau gauge. We consider the
cases in which the interaction vertex (i) is bare and (ii) is full. We then
apply the Landau-Khalatnikov-Fradkin transformations (LKFT) on the dynamically
generated solution and find analytical results for arbitrary value of $\xi$. We
also compare our results with exact numerical solutions available for a small
number of values of $\xi$ obtained through a direct analysis of the
corresponding SDE.


title: Testing Spatial Noncommutativity via Rydberg Atoms

abstract:
  The possibility of testing spatial noncommutativity via Rydberg atoms is
explored. An atomic dipole of a cold Rydberg atom is arranged in appropriate
electric and magnetic field, so that the motion of the dipole is constrained to
be planar and rotationally symmetric. Spatial noncommutativity leads to that
the canonical angular momentum possesses fractional values. In the limit of
vanishing kinetic energy, the dominate value of the lowest canonical angular
momentum takes $\hbar/2$. Furthermore, in the limit of eliminating magnetic
field, the dominate value of the lowest canonical angular momentum changes from
$\hbar/2$ to $\hbar/4$. This result is a clear signal of spatial
noncommutativity. An experimental verification of this prediction is suggested.


title:
Regge Description of pion-pion, pion-Kaon, pion-N, Kaon-N and NN Forward
  Scattering Above E_{kin}>1 Gev

abstract:
  We review our recent description of high energy forward hadronic cross
sections and in particular of pion scattering data by means of Regge theory. We
obtain a prediction for the total proton-proton cross section at LHC. In
addition, and contrary to some suggestions in the literature we show that
standard Regge behavior can accommodate both crossing symmetry and
factorization. Some consequences for low energy pion-pion scattering are
briefly discussed.


title: Domain Wall in the Linear Sigma Model

abstract:
  We discuss the role of the axial $U(1)_A$ symmetry in the chiral phase
transition using the $U(N_f)_R\times U(N_f)_L$ linear sigma model with two
massless quark flavors. We expect that above a certain temperature the axial
$U(1)_A$ symmetry will be effectively restored as well as $SU(N_f)_R\times
SU(N_f)_L$. Then we can construct a string-like static solution the $\eta$
string and a kink-like classical solution the domain wall during the chiral
phase transition. We give out the possible signals for detecting the domain
wall in ultrarelativistic heavy-ion collisions.


title: Charmed scalar mesons and related

abstract:
  Charmed scalar mesons are studied. By assigning the newly observed charmed
strange meson with a narrow width to one of the iso-triplet four-quark mesons,
decays of the multiplet members are investigated and, as the consequence,
existence of additional narrow scalar mesons is predicted. Decays of the
ordinary charmed scalar mesons are also studied. In addition, it is
demonstrated that four-quark mesons can play an important role in hadronic weak
decays of charm mesons.


title: Yang-Mills Theory In, Beyond, and Behind Observed Reality

abstract:
  The character of jets is dominated by the influence of intrinsically
nonabelian gauge dynamics. These proven insights into fundamental physics
ramify in many directions, and are far from being exhausted. I will discuss
three rewarding explorations from my own experience, whose point of departure
is the hard Yang-Mills interaction, and whose end is not yet in sight. Given an
insight so profound and fruitful as Yang and Mills brought us, it is in order
to try to consider its broadest implications, which I attempt at the end.


title:
Non-abelian color dielectric - towards the effective model of the low
  energy QCD

abstract:
  Lattice motivated triplet color scalar field theory is analyzed. We consider
non-minimal as well as covariant derivative coupling with SU(2) gauge fields.
Field configurations generated by external electric sources are presented.
Moreover non-Abelian magnetic monopoles are found. Dependence on the spatial
coordinates in the obtained solutions is identical as in the usual Abelian
case. We show also that after a decomposition of the fields a modified
Faddeev-Niemi action can be obtained. It contains explicit O(3) symmetry
breaking term parameterized by the condensate of an isoscalar field. Due to
that Goldstone bosons observed in the original Faddeev-Niemi model are removed.


title: Diquarks, Pentaquarks and Dibaryons

abstract:
  We explore the connection between pentaquarks and dibaryons composed of three
diquarks in the framework of the diquark model. With the available experimental
data on H dibaryon, we estimate the Pauli blocking and annihilation effects and
constrain the $P=-$ pentaquark $SU(3)_F$ singlet mass. Using the $\Theta^+$
pentaquark mass, we estimate $P=-$ dibaryon mass.


title: Advanced rapidity gap trigger

abstract:
  Nubmer of physically interesting processes is charachterized by the rapidity
gaps. In reality, this gaps is filled by uderlying events with high (more than
0.75 for higgs) probability. In this paper we purpose a way to detect this
shadowed events with aim to raise the number of rare events.


title: Different Contributions in omega pi0etagamma and rho pi0etagamma decays

abstract:
  We examine the radiative omega pi0etagamma and rho pi0etagamma decays in a
phenomenological framework. We consider the VMD mechanism, chiral loops,
intermediate a0-meson and rho−omega mixing. We find the values of the
decay width coming from the different amplitudes and compare the results with
other studies. We observe that a0-meson intermediate state is very important in
the case of the rho pi0etagamma decay and small in the other case for which VMD
contribution is dominant.


title: Non-Abelian Discrete Symmetries and Neutrino Masses: Two Examples

abstract:
  Two recent examples of non-Abelian discrete symmetries (S_3 and A_4) in
understanding neutrino masses and mixing are discussed.


title:
Adler function and hadronic contribution to the muon g-2 in a nonlocal
  chiral quark model

abstract:
  The behavior of the vector Adler function at spacelike momenta is studied in
the framework of a covariant chiral quark model with instanton-like quark-quark
interaction. This function describes the transition between the high energy
asymptotically free region of almost massless current quarks to the low energy
hadronized regime with massive constituent quarks. The model reproduces the
Adler function and V-A correlator extracted from the ALEPH and OPAL data on
hadronic \tau lepton decays, transformed into the Euclidean domain via
dispersion relations. The leading order contribution from hadronic part of the
photon vacuum polarization to the anomalous magnetic moment of the muon,
a_\mu^{hvp,1}, is estimated.


title:
New observables in longitudinal single-spin asymmetries in
  semi-inclusive DIS

abstract:
  We analyze longitudinal beam and target single-spin asymmetries in
semi-inclusive deep inelastic scattering and in jet deep inelastic scattering,
including all possible twist-3 contributions as well as quark mass corrections.
We take into account the path-ordered exponential in the soft correlators and
show that it leads to the introduction of a new distribution and a new
fragmentation function contributing to the asymmetries.


title: Second Order General Slow-Roll Power Spectrum

abstract:
  Recent combined results from the Wilkinson Microwave Anisotropy Probe (WMAP)
and Sloan Digital Sky Survey (SDSS) provide a remarkable set of data which
requires more accurate and general investigation. Here we derive formulae for
the power spectrum P(k) of the density perturbations produced during inflation
in the general slow-roll approximation with second order corrections. Also,
using the result, we derive the power spectrum in the standard slow-roll
picture with previously unknown third order corrections.


title: Little Higgs searches at LHC

abstract:
  A new method of solving the hierarchy problem in the SM has been proposed.
This method leads to the so-called "Little Higgs" models. The ATLAS experiment
at LHC has undertaken studies of the new particles predicted by these model: a
heavy top quark, heavy gauge bosons and additional Higgs bosons. Simulations of
their decays have been carried out. The sensitivity of the ATLAS experiment to
discover these new particles is discussed.


title:
Modular Invariant Soft Breaking, WMAP, Dark Matter and Sparticle Mass
  Limits

abstract:
  An analysis of soft breaking under the constraint of modular invariance is
given. The role of dilaton and moduli dependent front factors in achieving a
modular invariant $V_{soft}$ is emphasized. Further, it is shown that in string
models $\tan\beta$ is no longer a free parameter but is determined in terms of
$\alpha_{string}$ and the other soft parameters by the constraints of modular
invariance and radiative electroweak symmetry breaking. The above framework is
then used to analyze the neutralino relic density consistent with the WMAP data
at self dual points in the Kahler and complex structure moduli. One finds that
the combined set of constraints arising from modular invariant soft breaking,
radiative electroweak symmetry breaking and WMAP lead to upper limits on
sparticle masses for $\mu>0$. These limits are investigated for a class of
models and found to lie within reach of the Tevatron and of the Large Hadron
Collider (LHC). Further, an analysis of the neutralino-proton cross section
shows that dark matter in these models can be explored in CDMS (Soudan), GENIUS
and ZEPLIN. While the analysis is carried out within the general framework of
heterotic strings, the possibility that the results of the analysis may extend
to a broader class of string models, such as models based on intersecting D
branes, is also discussed.


title: Axino dark matter from thermal production

abstract:
  The axino is a promising candidate for dark matter in the Universe. It is
electrically and color neutral, very weakly interacting, and could be - as
assumed in this study - the lightest supersymmetric particle, which is stable
for unbroken R-parity. In supersymmetric extensions of the standard model, in
which the strong CP problem is solved via the Peccei-Quinn mechanism, the axino
arises naturally as the fermionic superpartner of the axion. We compute the
thermal production rate of axinos in supersymmetric QCD. Using hard thermal
loop resummation, we obtain a finite result in a gauge-invariant way, which
takes into account Debye screening in the hot quark-gluon-squark-gluino plasma.
The relic axino abundance from thermal scatterings after inflation is
evaluated. We find that thermally produced axinos could provide the dominant
part of cold dark matter, for example, for an axino mass of 100 keV and a
reheating temperature of 10^6 GeV.


title: Visible Effects of the Hidden Sector

abstract:
  The renormalization of operators responsible for soft supersymmetry breaking
is usually calculated by starting at some high scale and including only visible
sector interactions in the evolution equations, while ignoring hidden sector
interactions. Here we explain why this is correct only for the most trivial
structures in the hidden sector, and discuss possible implications. This
investigation was prompted by the idea of conformal sequestering. In that
framework hidden sector renormalizations by nearly conformal dynamics are
critical. In the original models of conformal sequestering it was necessary to
impose hidden sector flavor symmetries to achieve the sequestered form. We
present models which can evade this requirement and lead to no-scale or anomaly
mediated boundary conditions; but the necessary structures do not seem generic.
More generally, the ratios of scalar masses to gaugino masses, the $\mu$-term,
the $B\mu$-term, $A$-terms, and the gravitino mass can be significantly
affected.


title: Comparison of numerical solutions for Q^2 evolution equations

abstract:
  Q^2 evolution equations are important not only for describing hadron
reactions in accelerator experiments but also for investigating
ultrahigh-energy cosmic rays. The standard ones are called DGLAP evolution
equations, which are integrodifferential equations. There are methods for
solving the Q^2 evolution equations for parton-distribution and fragmentation
functions. Because the equations cannot be solved analytically, various methods
have been developed for the numerical solution. We compare brute-force,
Laguerre-polynomial, and Mellin-transformation methods particularly by focusing
on the numerical accuracy and computational efficiency. An efficient solution
could be used, for example, in the studies of a top-down scenario for the
ultrahigh-energy cosmic rays.


title:
$B\to\rho$ form factors including higher twist contributions and
  reliability of pQCD approach

abstract:
  We discuss $\btorho$ form factors within the framework of perturbative QCD,
including the higher twist contributions and study the validity of such an
approach in calculating quantities such as form factors, which in principle and
quite generally are thought to be completely non-perturbative objects and are
expected to receive large contributions from the non-perturbative regime in the
calculations. It is shown that including the Sudakov and threshold resummation
effects, the general expectations of the pQCD approach are clearly met and the
form factors do indeed receive most of the contribution from the perturbative
region. We do not make an attempt to precisely evaluate the form factors but
rather try to study the gross features and behaviour of the same. We also find
that use of single wave function for the B-meson may actually underestimate
various quantities. The results clearly indicate the validity and reliability
of pQCD calculations, at least in this particular case.


title: Rare $\Omega^{-} \to \Xi(1530)^{0} \pi^-$ decay in the Skyrme model

abstract:
  Rare nonleptonic $\Omega^{-} \to \Xi(1530)^{0} \pi^-$ decay branching ratio
is estimated by means of the QCD enhanced effective weak Hamiltonian
supplemented by the SU(3) Skyrme model used to estimate the nonperturbative
matrix elements. The whole scheme is equivalent to that which works well for
the nonleptonic hyperon and $\Omega^{-}$ decays. The computed rate is in a good
agreement with data.


title: The Noncommutative Standard Model and Forbidden Decays

abstract:
  In this contribution we discuss the Noncommutative Standard Model and the
associated Standard Model-forbidden decays that can possibly serve as an
experimental signature of space-time noncommutativity.


title:
Effective Lagrangian approach to nuclear mu-e conversion and the role of
  vector mesons

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


title: Dark Geometry

abstract:
  Extra-dimensional theories contain additional degrees of freedom related to
the geometry of the extra space which can be interpreted as new particles. Such
theories allow to reformulate most of the fundamental problems of physics from
a completely different point of view. In this essay we concentrate on the brane
fluctuations which are present in brane-worlds, and how such oscillations of
the own space-time geometry along curved extra dimensions can help to resolve
the Universe missing mass problem. The energy scales involved in these models
are low compared to the Planck scale, and this means that some of the brane
fluctuations distinctive signals could be detected in future colliders and in
direct or indirect dark matter searches.


title: Eikonal Amplitude in the Gravireggeon Model at Superplanckian Energies

abstract:
  The gravity effects in high-energy scattering, described by a
four-dimensional eikonal amplitude related to gravireggeons induced by compact
extra dimensions are studied. It is demonstrated that the real part of the
eikonal (with a massless mode subtracted) dominates its imaginary part at both
small and large impact parameters, in contrast to the usual case of hadronic
high-energy behavior. The real part of the scattering amplitude exhibits an
exponential falloff at large momentum transfer, similar to that of the
imaginary part of the amplitude.


title:
Fermion polarization in sfermion decays as a probe of CP phases in the
  MSSM

abstract:
  The longitudinal polarization of fermions (tops and taus) produced in
sfermion decays to neutralinos or charginos can be a useful tool for the
determination of SUSY parameters. We discuss this fermion polarization in the
context of the MSSM with complex parameters. We show that the dependence on
CP-violating phases can be large and that the fermion polarization may hence be
used as a sensitive probe of CP phases in the MSSM.


title: Astroparticle Physics

abstract:
  In this astro-particle lecture course I shall try to emphasize evidence of
the new physics which we have in cosmological and astrophysical data. This
includes support of the inflationary model, necessity of dark energy and of
non-baryonic dark matter, the Grizen-Zatsepin-Kuzmin puzzle of the ultra-high
energy cosmic rays.


title:
Four-fermion production at gamma gamma colliders: 1. Lowest-order
  predictions and anomalous couplings

abstract:
  We have constructed a Monte Carlo generator for lowest-order predictions for
the processes gamma gamma -> 4f and gamma gamma -> 4f+gamma in the Standard
Model and extensions thereof by an effective gamma gamma Higgs coupling as well
as anomalous triple and quartic gauge-boson couplings. Polarization is fully
supported, and a realistic photon beam spectrum can be taken into account. For
the processes gamma gamma -> 4f all helicity amplitudes are explicitly given in
a compact form. The presented numerical results contain, in particular, a
survey of cross sections for representative final states and their comparison
to results obtained with the program package Whizard/Madgraph. The impact of a
realistic beam spectrum on cross sections and distributions is illustrated.
Moreover, the size of various contributions to cross sections, such as from
weak charged- or neutral-current, or from strong interactions, is analyzed.
Particular attention is paid to W-pair production channels gamma gamma -> W W
-> 4f(+gamma) where we investigate the impact of background diagrams, possible
definitions of the W-pair signal, and the issue of gauge-invariance violation
caused by finite gauge-boson widths. Finally, the effects of triple and quartic
anomalous gauge-boson couplings on cross sections as well as the possibility to
constrain these anomalous couplings at future gamma gamma colliders are
discussed.


title: Phase diagram of dense neutral three-flavor quark matter

abstract:
  We study the phase diagram of dense, locally neutral three-flavor quark
matter as a function of the strange quark mass, the quark chemical potential,
and the temperature, employing a general nine-parameter ansatz for the gap
matrix. At zero temperature and small values of the strange quark mass, the
ground state of matter corresponds to the color-flavor-locked (CFL) phase. At
some critical value of the strange quark mass, this is replaced by the recently
proposed gapless CFL (gCFL) phase. We also find several other phases, for
instance, a metallic CFL (mCFL) phase, a so-called uSC phase where all colors
of up quarks are paired, as well as the standard two-flavor
color-superconducting (2SC) phase and the gapless 2SC (g2SC) phase.


title:
Magnetic moments of the exotic pentaquark baryons within the chiral
  quark-soliton model

abstract:
  We present in this talk recent results of the magnetic moments of the baryon
antidecuplet within the framework of the chiral quark-soliton model in the
chiral limit. The dynamic parameters of the model are fixed by using the
experimental data for those of the baryon octet. Sum rules for the magnetic
moments are derived. We found that the magnetic moments of the baryon
antidecuplet have opposite signs to their charges. The magnetic moments of the
neutral baryon antidecuplet turn out to be compatible with zero.


title: Status of global fits to neutrino oscillations

abstract:
  We review the present status of global analyses of neutrino oscillations,
taking into account the most recent neutrino data including the latest KamLAND
and K2K updates presented at Neutrino2004, as well as state-of-the-art solar
and atmospheric neutrino flux calculations. We give the two-neutrino solar +
KamLAND results, as well as two-neutrino atmospheric + K2K oscillation regions,
discussing in each case the robustness of the oscillation interpretation
against departures from the Standard Solar Model and the possible existence of
non-standard neutrino physics. Furthermore, we give the best fit values and
allowed ranges of the three-flavour oscillation parameters from the current
worlds' global neutrino data sample and discuss in detail the status of the
small parameters $\alpha \equiv \Dms/\Dma$ as well as $\sin^2\theta_{13}$,
which characterize the strength of CP violating effects in neutrino
oscillations. We also update the degree of rejection of four-neutrino
interpretations of the LSND anomaly in view of the most recent developments.


title: Implications of CP Asymmetries in $B \to \pi^+ \pi^-$

abstract:
  CP asymmetries in $B^0(t)\to \pi^+ \pi^-$ are studied by relating this
process in broken flavor SU(3) with $B^+\to K^0\pi^+$ and $B^0\to K^+\pi^-$.
Using two different scenarios for SU(3) breaking, we show that the range of
values of the weak phase $\alpha$ permitted by the measured asymmetries
overlaps with that obtained from other CKM constraints, supporting the KM
origin of the asymmetries. We evaluate the potential precision of this method
to improve the determination of $\alpha$.


title: Evidence for the saturation of the Froissart bound

abstract:
  It is well known that fits to high energy data cannot discriminate between
asymptotic ln(s) and ln^2(s) behavior of total cross section. We show that this
is no longer the case when we impose the condition that the amplitudes also
describe, on average, low energy data dominated by resonances. We demonstrate
this by fitting real analytic amplitudes to high energy measurements of the
gamma p total cross section, for sqrt(s) > 4 GeV. We subsequently require that
the asymptotic fit smoothly join the sqrt(s) = 2.01 GeV cross section described
by Dameshek and Gilman as a sum of Breit-Wigner resonances. The results
strongly favor the high energy ln^2(s) fit of the form sigma_{gamma p} = c_0 +
c_1 ln(nu/m) + c_2 ln^2(nu/m) + beta_{P'}/sqrt(nu/m), basically excluding a
ln(s) fit of the form sigma_{\gamma p} = c_0 + c_1 ln(nu/m) +
beta_P'/sqrt(\nu/m), where nu is the laboratory photon energy. This evidence
for saturation of the Froissart bound for gamma p interactions is confirmed by
applying the same analysis to pi p data using vector meson dominance.


title: Entropy for Color Superconductivity in Quark Matter

abstract:
  We study a model for color superconductivity with both three colors and
massless flavors including quark pairing. By using the Hamiltonian in the
color-flavor basis we can calculate the quantum entropy. From this we are able
to further investigate the phases of the color superconductor, for which we
find a rather sharp transition to color superconductivity above a chemical
potential around $290 $MeV.


title: Chasing CHOOZ

abstract:
  We relate the MNS and CKM mixing matrices using ideas from grand unification.
We catalog models in terms of the family symmetries of the down quark mass
matrices, and emphasize the role of the Cabibbo angle in the lepton mixing
matrix. We find a large class of models with an observable CHOOZ angle \sim
\lambda/\sqrt{2}


title: Tests of Lorentz invariance using hydrogen molecules

abstract:
  We discuss the consequences of Lorentz violation (as expressed within the
Lorentz-violating extension of the standard model) for the hydrogen molecule,
which represents a generic model of a molecular binding. Lorentz-violating
shifts of electronic, vibrational and rotational energy levels, and of the
internuclear distance are calculated. This offers the possibility of obtaining
improved bounds on Lorentz invariance by experiments using molecules.


title:
Contribution of asymmetric strange-antistrange sea to the
  Paschos-Wolfenstein relation

abstract:
  The NuTeV Collaboration reported a value of $\sin^{2}\theta_{w}$ measured in
neutrino-nucleon deep inelastic scattering, and found that the value is three
standard deviations from the standard model prediction. This result is obtained
under the assumption that the strange-antistrange sea quarks of nucleons are
symmetric, and that the up and down quark distributions are symmetric with the
simultaneous interchange of $u$$\leftrightarrow$$d$ and
$p$$\leftrightarrow$$n$. We discuss the contribution of asymmetric
strange-antistrange sea to the Paschos-Wolfenstein relation in the extraction
of weak mixing angle $\sin^{2}\theta_{w}$. We also point out that the
contribution of asymmetric strange-antistrange sea should remove roughly
30--80% of the discrepancy between the NuTeV result and other determinations of
$\sin^{2}\theta_{w}$, when using the light-cone meson-baryon model to calculate
the contribution of the strange-antistrange sea.


title: Neutrino properties from high energy astrophysical neutrinos

abstract:
  It is shown how high energy neutrino beams from very distant sources can be
utilised to learn about some properties of neutrinos such as lifetimes, mass
hierarchy etc. Furthemore, even mixing elements such as U_e3 and the CPV phase
in the neutrino mixing matrix can be measured in principle. Pseudo-Dirac mass
differences as small as 10^-18 eV^2 can be probed as well.


title: Diquark and Pion Condensation in Random Matrix Models for two-color QCD

abstract:
  We introduce a random matrix model with the symmetries of QCD with two colors
at nonzero isospin and baryon chemical potentials and temperature. We analyze
its phase diagram and find phases with condensation of pion and diquark states
in addition to the phases with spontaneously broken chiral symmetries. In the
limit of small chemical potentials and quark masses, we reproduce the mean
field results obtained from chiral Lagrangians. As in the case of QCD with
three colors, the presence of two chemical potentials breaks the flavor
symmetry and leads to phases that are characterized by different behaviors of
the chiral condensates for each flavor. In particular, the phase diagram we
obtain is similar to QCD with three colors and three flavors of quarks of equal
masses at zero baryon chemical potential and nonzero isospin and strange
chemical potentials. A tricritical point of the superfluid transitions found in
lattice calculations and from an analysis in terms of chiral Lagrangians does
not appear in the random matrix model. Remarkably, at fixed isospin chemical
potential, for the regions outside of the superfluid phases, the phase diagram
in the temperature - baryon chemical potential plane for two colors and three
colors are qualitatively the same.


title:
Fluctuations of the Initial Conditions and the Continuous Emission in
  Hydrodynamic Description of Two-Pion Interferometry

abstract:
  Within hydrodynamic approach, we study the Bose-Einstein correlation of
identical pions by taking into account both event-by-event fluctuating initial
conditions and continuous pion emission during the whole development of the hot
and dense matter formed in high-energy collisions. Considerable deviations
occur, compared to the usual hydro calculations with smooth initial conditions
and a sudden freeze-out on a well defined hypersurface. Comparison with data at
RHIC shows that, despite rather rough approximation we used here, this
description can give account of the $m_T$ dependence of $R_L$ and $R_s$ and
improves considerably the one for $R_o$ with respect to the usual version.


title: Progress on Models of Neutrino Masses and Mixings

abstract:
  We review some recent results obtained by our group on models of neutrino
masses and mixings in the general context of SUSY GUT's with an associated
flavour symmetry.


title: Renormalization flow of QED

abstract:
  We investigate textbook QED in the framework of the exact renormalization
group. In the strong-coupling region, we study the influence of
fluctuation-induced photonic and fermionic self-interactions on the
nonperturbative running of the gauge coupling. Our findings confirm the
triviality hypothesis of complete charge screening if the ultraviolet cutoff is
sent to infinity. Though the Landau pole does not belong to the physical
coupling domain owing to spontaneous chiral symmetry breaking (chiSB), the
theory predicts a scale of maximal UV extension of the same order as the Landau
pole scale. In addition, we verify that the chiSB phase of the theory which is
characterized by a light fermion and a Goldstone boson also has a trivial
Yukawa coupling.


title: Gluon Radiation off Massive Quarks in a QCD Medium

abstract:
  Medium-induced gluon radiation from massless and massive quarks is treated in
the same formalism. The dead cone which regulates gluon radiation from massive
quarks in the vacuum at small angles, is filled in the medium but constitutes a
small fraction of the available phase space. Our study indicates that the
energy loss for charmed hadrons at RHIC should be smaller than for light
hadrons, but still sizable.


title: Flavor and CP Violation Induced by Atmospheric Neutrino Mixing

abstract:
  Neutrino oscillation experiments suggest existence of new flavor-violating
interactions in high energy scale. It may be possible to probe them by the
flavor- and CP-violating processes in leptons and hadrons in the supersymmetric
(SUSY) models. In this article the third-generation flavor violation is
reviewed in the SUSY seesaw model and SUSY SU(5) GUT with the right-handed
neutrinos.


title: SuperWIMP dark matter scenario in light of WMAP

abstract:
  The heavy gravitinos in minimal supergravity (mSUGRA) models couple
gravitionally and can naturally be the Superweakly Interacting Massive Particle
(SuperWIMP). As plausible candidates for the cold dark matter in the universe,
such gravitino SuperWIMPs can naturally evade the current dark matter detection
experiments due to their superweak couplings. However, this scenario must
subject to the constraints from the Big Bang nucleosynthesis (BBN) predictions
for light element abundances as well as the Wilkinson Mircrowave Anisotropy
Probe (WMAP) data for the relic density. Our study shows that requiring BBN
predictions to agree with the WMAP data of light element abundances can impose
upper and lower mass bounds for both the gravitino and the next-to-lightest
supersymmetric particle (NLSP). From a scan over the mSUGRA parameter space
subjected to the BBN constraints and the WMAP data, we find that in the
neutralino NLSP case, the low tan-beta (< 40) region as well as the region
accessible at CERN Large Hadron Colldier (LHC) will be severely restrained.


title: Full one-loop corrections to SUSY Higgs boson decays into charginos

abstract:
  We present the decay widths of the heavier Higgs bosons $H^0$ and $A^0$ into
chargino pairs in the minimal supersymmetric standard model, including full
one-loop corrections. All parameters for charginos are renormalized in the
on-shell scheme. The importance of the corrections to the chargino mass matrix
and mixing matrices is pointed out. The full corrections are typically of the
order of 10 %.


title: Moose models with vanishing $S$ parameter

abstract:
  In the linear moose framework, which naturally emerges in deconstruction
models, we show that there is a unique solution for the vanishing of the $S$
parameter at the lowest order in the weak interactions. We consider an
effective gauge theory based on $K$ SU(2) gauge groups, $K+1$ chiral fields and
electroweak groups $SU(2)_L$ and $U(1)_Y$ at the ends of the chain of the
moose. $S$ vanishes when a link in the moose chain is cut. As a consequence one
has to introduce a dynamical non local field connecting the two ends of the
moose. Then the model acquires an additional custodial symmetry which protects
this result. We examine also the possibility of a strong suppression of $S$
through an exponential behavior of the link couplings as suggested by Randall
Sundrum metric.


title: Gluon Emission of Heavy Quarks: Dead Cone Effect

abstract:
  The lowest-order induced soft gluon radiation processes of heavy quarks have
been analyzed to quantify the dead cone effect. This effect is most likely
expected to suppress significantly the energy loss of charm quarks passing an
amorphous color-neutral deconfined medium, as has been concluded from recent
experiments at RHIC.


title: Sextet Quark Physics at the Tevatron ?

abstract:
  A sextet quark sector of QCD, together with the sextet higgs mechanism, would
produce a major change in the strong interaction above the electroweak scale.
This change may already be evident in Cosmic Ray physics and, if so, dramatic
effects are to be expected at the LHC. In this paper we discuss whether
evidence for the sextet sector could be seen at the Tevatron.
  A major consequence of the connection between QCD and electroweak symmetry
breaking is the strong coupling of the pomeron to the electroweak sector. At
the Tevatron, the energy is too low to produce vector boson pairs directly via
double pomeron exchange, but a number of small cross-section effects could be
seen in diffractive, and diffractive related, processes involving $W^{\pm}$ and
$Z^0$ vector bosons. Probably, the most important feature that could be
decisively established is that the production cross-section for $W^+W^-$ and
$Z^0Z^0$ pairs has an anomalous component with event characteristics different
from the Standard Model. This would be the first indication of what should
become a dominant, very large, cross-section at the LHC.
  If the sextet quark dynamical mass scale is well above the top quark mass,
then the production properties of $W$'s and $Z$'s could be the only new physics
visible at the Tevatron scale. If this scale is lower the situation could be
more subtle. The observed $t\bar{t}$ events could originate from the $\eta_6$ -
the ``sextet higgs'', even though they can be understood perturbatively. The
interpretation of the top quark mass would, however, be different and
non-perturbative decay modes should also be seen. A jet excess at large $E_T$
would provide supporting evidence for this picture, since $\alpha_s$ evolution
should stop at $E_T \sim$ ``$m_{top}$''.


title:
Electroweak Radiative Corrections to pp/ppbar -> W+/- -> l+/- nu Beyond
  the Pole Approximation

abstract:
  We present a calculation of the complete electroweak O(alpha) corrections to
pp/ppbar -> W+/- -> l+/- nu (l=e, mu) in the Standard Model of electroweak
interactions, focusing on those corrections which do not contribute in the pole
approximation. We study in detail the effect of these corrections on the
transverse mass distribution, the W-width measurement, and the transverse mass
ratio and cross section ratio of W and Z bosons.


title:
Two-loop gluino corrections to the inclusive $B\to X_{_s}\gamma$ decay
  in CP violating MSSM with large $\tan\beta$

abstract:
  We investigate two-loop gluino corrections to the effective Lagrangian for
$b\to s+\gamma(g)$ in the minimal supersymmetric extension of the standard
model (MSSM) at large $\tan\beta$, including the contributions in which quark
flavor change is mediated by charginos. Using the translation invariant of loop
momenta and the Ward-Takahashi identities (WTIs) that are required by the
$SU(3)_c\times U(1)_{_{em}}$ gauge invariance, we simplify our expressions to
concise forms. As an example, we discuss two-loop gluino corrections to the CP
asymmetry of inclusive $B\to X_{_s}\gamma$ decay in CP violating MSSM.


title:
Four-loop renormalization of QCD: full set of renormalization constants
  and anomalous dimensions

abstract:
  The anomalous dimensions of the gluon and ghost fields as well as the
ghost-ghost-gluon and quark-quark-gluon vertexes are analytically computed in
pQCD. Taken together with already available anomalous dimensions of the
coupling constant, the quark field and the mass the results lead to complete
knowledge of all renormalization constant entering into the renormalization of
the QCD Lagrangian at the four-loop level. As a by-product we get scale and
scheme invariant gluon and ghost propagators at NNNLO. Using a theorem due to
Dudal, Verschelde and Sorella, we also construct the four-loop anomalous
dimension of the ``gluon mass operator'', A^2, in the Landau gauge.


title:
A model finding a new Richardson potential with different scales for
  confinement and asymptotic freedom, by fitting the properties of ${\D}^{++}$
  and ${\Om}^{-}$

abstract:
  Phenomenological Richardson potential has built in asymptotic freedom (AF in
short) and confinement, with only one parameter $\La$ in the potential. But it
is known that the scales of AF and confinement are not the same. In the present
work a relativistic mean field calculation for baryons is tried out with two
parameters $\La$ and $\La^\prime$ for AF and confinement respectively .To test
the two parameter potential we calculate the energies and the magnetic moments,
of the triple u - quark system (${\D}^{++}$) and the triple s - quark system
(${\Om}^{-}$) and found good values for $\La=100 MeV$ and $\La^\prime ~= 350
MeV$. So we believe that the modified Richardson potential should have AF scale
$\La ~= 100 MeV$ and the confinement scale $\La^\prime ~= 350 MeV$.


title: Pentaquark spectroscopy: exotic Theta baryons

abstract:
  We propose a collective stringlike model of pentaquarks with the geometry of
an equilateral tetrahedron in which the four quarks are located at the four
corners and the antiquark in its center. The nonplanar equilibrium
configuration is a consequence of the permutation symmetry of the four quarks.
In an application to the spectrum of exotic Theta baryons, we find that the
ground state pentaquark has angular momentum and parity J(p)=1/2(-) and a small
magnetic moment of 0.382 nuclear magnetons. The decay width is suppressed by
the spatial overlap with the decay products.


title: Status of $\psi''$ Decays to Charmless Final States

abstract:
  The non-$D \bar D$ decays of the $\ppp = \psi(3770)$ resonance are reviewed
and possibilities for further measurements are noted. These decays can shed
light on S--D mixing, the ``missing'' $\psi' = \psi(3686)$ decays, a possible
discrepancy between the total and $D \bar D$ cross sections at the $\ppp$, and
rescattering effects contributing to enhanced $b \to s$ penguin amplitudes in
$B$ meson decays.


title: Chiral Gauge Models for Light Sterile Neutrinos

abstract:
  We construct a family of simple gauge models in which three sterile neutrinos
become naturally light by virtue of a generalized seesaw mechanism involving a
chiral gauge symmetry. Examples where the chiral gauge group is SU(5)', SU(7)',
SU(3)' and/or their descendants are presented. A unified model based on SO(10)
x SO(10)' which embeds many of these models is constructed wherein three light
sterile neutrinos are just as natural as the three ordinary neutrinos. These
gauge models have relevance to current neutrino oscillation data, including the
LSND anomaly.


title: Bounds on heavy sterile neutrinos revisited

abstract:
  We revise the bounds on heavy sterile neutrinos, especially in the case of
their mixing with muon neutrinos in the charged current. We summarize the
present experimental limits, and we reanalyze the existing data from the
accelerator neutrino experiments and from Super-Kamiokande to set new bounds on
a heavy sterile neutrino in the range of masses from 8 MeV to 390 MeV. We also
discuss how the future accelerator neutrino experiments can improve the present
limits.


title: Family Unification on an Orbifold

abstract:
  We construct a family-unified model on a Z_2xZ_2 orbifold in five dimensions.
The model is based on a supersymmetric SU(7) gauge theory. The gauge group is
broken by orbifold boundary conditions to a product of grand unified SU(5) and
SU(2)xU(1) flavor symmetry. The structure of Yukawa matrices is generated by an
interplay between spontaneous breaking of flavor symmetry and geometric factors
arising due to field localization in the extra dimension.


title: Appearance of neutronization peak and decaying supernova neutrinos

abstract:
  Nonradiative neutrino decay, which is not satisfactorily constrained,
possibly and significantly changes the detected neutrino signal from galactic
supernova explosions. We focus on the appearance of a sharp peak due to a
neutronization burst in the time profile; this phenomenon would occur if the
original \nu_e, produced at the neutrinosphere and becoming \nu_{2,3} at the
stellar surface, decays into a lighter antineutrino state such as \bar\nu_{1,2}
coupled to \bar\nu_e. This is due to the fact that the signature of the
neutronization burst is common to all numerical simulations. Therefore, the
appearance of a neutronization peak in the \bar\nu_e signal, if it were
detected, would clearly indicate the nonstandard properties of neutrinos. Using
a newly developed formulation that includes flavor conversions inside the
supernova envelope and neutrino decay during propagation in a vacuum, we
calculate the expected neutrino signal at the detectors; the lifetimes of three
modes \tau_{12}, \tau_{13}, and \tau_{23} are taken to be free parameters. We
further introduce simple quantities, which represent a peak sharpness of time
profile and spectral hardness, and investigate the parameter dependence of
these quantities. As the result, it is found that they are quite dependent on
the relevant parameters, but it would be quite difficult to distinguish models
using the signal obtained by the Super-Kamiokande detector; the future
megaton-class detectors would have sufficient sensitivity. We also compare the
neutrino decay model with another mechanism, i.e., resonant spin-flavor
conversion, which also may give the appearance of a neutronization peak, and
conclude that these two independent mechanisms give a different signal and one
can be distinguished from the other.


title:
Bilarge Neutrino Mixing and \mu - \tau Permutation Symmetry for Two-loop
  Radiative Mechanism

abstract:
  The presence of approximate electron number conservation and \mu-\tau
permutation symmetry of S_2 is shown to naturally provide bilarge neutrino
mixing. First, the bimaximal neutrino mixing together with U_{e3}=0 is
guaranteed to appear owing to S_2 and, then, the bilarge neutrino mixing
together with |U_{e3}|<<1 arises as a result of tiny violation of S_2. The
observed mass hierarchy of \Delta m^2_{\odot}<<\Delta m^2_{atm} is subject to
another tiny violation of the electron number conservation. This scenario is
realized in a specific model based on SU(3)_L x U(1)_N with two-loop radiative
mechanism for neutrino masses. The radiative effects from heavy leptons
contained in lepton triplets generate the bimaximal structure and those from
charged leptons, which break S_2, generate the bilarge structure together with
|U_{e3}|<<1. To suppress dangerous flavor-changing neutral current interactions
due to Higgs exchanges especially for quarks, this S_2 symmetry is extended to
a discrete Z_8 symmetry, which also ensures the absence of one-loop radiative
mechanism.


title: Power-law tails from multiplicative noise

abstract:
  We show that the well-known Langevin equation, modeling the Brownian motion
and leading to a Gaussian stationary distribution of the corresponding
Fokker-Planck equation, is changed by the smallest multiplicative noise. This
leads to a power-law tail of the distribution at large enough momenta. At
finite ratio of the correlation strength for the multiplicative and additive
noise the stationary energy distribution becomes exactly the Tsallis
distribution.