title: Quark induced excitations of the instanton liquid

abstract:
  The selfconsistent approach to the quark interactions in the instanton liquid
is developed within the tadpole approximation calculating the basic functional
integral. The effective Lagrangian obtained includes colourless scalar field
interacting with quarks. The origin of this dynamical field as an interaction
carrier in soft momentum region is discussed.


title:
Branching Ratio and CP Violation of B to pi pi Decays in Perturbative
  QCD Approach

abstract:
  We calculate the branching ratios and CP asymmetries for B^0 to pi^+pi^-, B^+
to pi^+pi^0 and B^0 to pi^0pi^0 decays, in a perturbative QCD approach. In this
approach, we calculate non-factorizable and annihilation type contributions, in
addition to the usual factorizable contributions. We found that the
annihilation diagram contributions are not very small as previous argument. Our
result is in agreement with the measured branching ratio of B to pi^+pi^- by
CLEO collaboration. With a non-negligible contribution from annihilation
diagrams and a large strong phase, we predict a large direct CP asymmetry in
B^0 to pi^+pi^-, and pi^0pi^0, which can be tested by the current running B
factories.


title: A D-brane alternative to unification

abstract:
  We propose a minimal embedding of the Standard Model spectrum in a D-brane
configuration of type I string theory. The SU(3) color and SU(2) weak
interactions arise from two different collections of branes. The model is
neither grand unified nor supersymmetric but it naturally leads to the right
prediction of the weak angle for a string scale of the order of a few TeV. It
requires two Higgs doublets and guarantees proton stability.


title: Hadron Multiplicities

abstract:
  We review results on hadron multiplicities in high energy particle
collisions. Both theory and experiment are discussed. The general procedures
used to describe particle multiplicity in Quantum Chromodynamics (QCD) are
summarized. The QCD equations for the generating functions of the multiplicity
distributions are presented both for fixed and running coupling strengths. The
mean multiplicities of gluon and quark jets, their ratio, higher moments, and
the slopes of multiplicities as a function of energy scale, are among the main
global features of multiplicity for which QCD results exist. Recent data from
high energy e+e- experiments, including results for separated quark and gluon
jets, allow rather direct tests of these results. The theoretical predictions
are generally quite successful when confronted with data. Jet and subjet
multiplicities are described. Multiplicity in limited regions of phase space is
discussed in the context of intermittency and fractality. The problem of
singularities in the generating functions is formulated. Some special features
of average multiplicities in heavy quark jets are described.


title: Baryon Spectrum in the Large N_c Limit

abstract:
  We present a model-independent analysis of the mass spectrum of nonstrange
L=1 baryons in large N_c QCD. The 1/N_c expansion is used to select and order a
basis of effective operators that spans the nine observables (seven masses and
two mixing angles). Comparison to the data provides support for the validity of
the 1/N_c expansion, but also reveals that only a few nontrivial operators are
strongly preferred. We show that our results have a consistent interpretation
in a constituent quark model with pseudoscalar meson exchange interactions.


title: Double transverse spin asymmetries in vector boson production

abstract:
  We investigate a helicity non-flip double transverse spin asymmetry in vector
boson production in hadron-hadron scattering, which was first considered by
Ralston and Soper at the tree level. It does not involve transversity functions
and in principle also arises in W-boson production for which we present the
expressions. The asymmetry requires observing the transverse momentum of the
vector boson, but it is not suppressed by explicit inverse powers of a large
energy scale. However, as we will show, inclusion of Sudakov factors causes
suppression of the asymmetry, which increases with energy. Moreover, the
asymmetry is shown to be approximately proportional to x_1 g_1(x_1) x_2 \bar
g_1(x_2), which gives rise to additional suppression at small values of the
light cone momentum fractions. This implies that it is negligible for Z or W
production and is mainly of interest for \gamma^* at low energies. We also
compare the asymmetry with other types of double transverse spin asymmetries
and discuss how to disentangle them.


title: Reply to Boglione and Pennington

abstract:
  In a recent article we presented an argument which, we believe, shows to be
incorrect an estimate, by Boglione and Pennington, of corrections to the
valence (quenched) approximation predictions for properties of the lightest
scalar glueball. Boglione and Pennington's reply to our article, it appears to
us, fails to address the specific technical issues we raised.


title: Parametrizing the mixing matrix : A unified approach

abstract:
  A unified approach to parametrization of the mixing matrix for $N$
generations is developed. This approach not only has a clear geometrical
underpinning but also has the advantage of being economical and recursive and
leads in a natural way to the known phenomenologically useful parametrizations
of the mixing matrix.


title: N* Resonances in e+e- Collisions at Bepc

abstract:
  $J/\Psi$ particles are abundantly produced at the Beijing Electron Positron
Collider (BEPC). The $J/\Psi$ decays provide an excellent place for studying
$N^*$ resonances. For $J/\Psi\to\bar NN\pi$ and $\bar NN\pi\pi$, the $\pi N$
and $\pi\pi N$ systems are limited to be pure isospin 1/2 due to isospin
conservation. This is a big advantage in studying $N^*$ resonances from
$J/\Psi$ decays, compared with $\pi N$ and $\gamma N$ experiments which suffer
difficulty on the isospin decomposition of 1/2 and 3/2. All other $N^*$ decay
channels which are presently under investigation at CEBAF(JLab, USA),
ELSA(Bonn,Germany) and GRAAL(Grenoble, France) with real photon or space-like
virtual photon can also be studied at BEPC complementally with the time-like
virtual photon. The process $J/\Psi\to\bar NN^*$ or $N\bar N^*$ provides a new
way to probe the internal structure of the $N^*$ resonances. The recent results
and outlook of our new $N^*$ program at BEPC are presented.


title: On the derivation of the neutrino oscillation length formula

abstract:
  Forsaking the traditionnal hand-waving in the treatment of the motion, we
show that the ultra-relativistic approximation and the equality of kinematical
variables are unnecessary ingredients in the derivation of the oscillation
length using plane waves, at least in a two flavor world. It ensues that the
formula is valid as it is in the non relativistic regime, provided one uses the
correct variable which is found to be momentum, not energy, and that the
precise production kinematics is irrelevant. Consequences for the more complete
treatments are briefly evoked.


title: Two sterile neutrinos as a consequence of matter structure

abstract:
  An algebraic argument based on a series of generalized Dirac equations,
truncated by an "intrinsic Pauli principle", shows that there should exist two
sterile neutrinos as well as three families of leptons and quarks. Then, the
influence of these additional neutrinos on neutrino oscillations is studied. As
an example, a specific model of effective five-neutrino texture is proposed,
where only the nearest neighbours in the sequence of five neutrinos ordered as
$\nu_s, \nu'_s, \nu_e, \nu_\mu, \nu_\tau$ are coupled through the 5x5 mass
matrix. Its diagonal elements are taken as negligible in comparison with its
nonzero off-diagonal entries.


title:
Optimal-Observable Analysis of the Angular and Energy Distributions for
  Top-Quark Decay Products at Polarized Linear Colliders

abstract:
  An optimal-observable analysis of the angular and energy distributions of the
leptons and bottom quarks in the process e+e- --> tt-bar --> l^{+-}/b(b-bar)...
has been performed in order to measure the most general top-quark couplings to
gauge bosons at polarized linear colliders. The optimal beam polarization for
determination of each coupling has been found. A very sensitive test of CP
violation in tt-bar production and decay has been proposed.


title: Can the beta decay of neutral kaons be observed?

abstract:
  The rate of the beta decay of neutral kaons is calculated within the meson
dominance approach taking into account the relation between the KK\rho and
\pi\pi\rho coupling constants which follows from the vector meson dominance in
electromagnetic interactions and isospin symmetry. The decay rate transforms
into the following branching fraction summed over the charge states indicated:
B(K0L -> K+- e-+ nu)=(2.53+-0.10)x10^{-9}. The error is dominated by our
estimate of isospin violating effects. Experimental aspects of such a
measurement are discussed.


title:
Non-extensive statistical mechanics and particle spectra in elementary
  interactions

abstract:
  We generalize Hagedorn's statistical theory of momentum spectra of particles
produced in high-energy collisions using Tsallis' formalism of non-extensive
statistical mechanics. Suitable non-extensive grand canonical partition
functions are introduced for both fermions and bosons. Average occupation
numbers and moments of transverse momenta are evaluated in an analytic way. We
analyse the energy dependence of the non-extensitivity parameter q as well as
the q-dependence of the Hagedorn temperature. We also take into account the
multiplicity. As a final result we obtain formulas for differential cross
sections that are in very good agreement with e+e- annihilation experiments.


title: The pionium lifetime in generalized chiral perturbation theory

abstract:
  Pionium lifetime corrections to the nonrelativistic formula are calculated in
the framework of the quasipotential-constraint theory approach. The calculation
extends an earlier evaluation, made in the scheme of standard chiral
perturbation theory, to the scheme of generalized chiral perturbation theory,
in which the quark condensate is left as a free parameter. The pionium lifetime
is calculated as a function of the combination $(a_0^0-a_0^2)$ of the $\pi\pi$
S-wave scattering lengths with isospin I=0,2.


title: Neutrino Oscillations v.s. Leptogenesis in SO(10) Models

abstract:
  We study the link between neutrino oscillations and leptogenesis in the
minimal framework assuming an SO(10) see-saw mechanism with 3 families. Dirac
neutrino masses being fixed, the solar and atmospheric data then generically
induce a large mass-hierarchy and a small mixing between the lightest
right-handed neutrinos, which fails to produce sufficient lepton asymmetry by 5
orders of magnitudes at least. This failure can be attenuated for a very
specific value of the mixing sin^2(2\theta_{e3})=0.1, which interestingly lies
at the boundary of the CHOOZ exclusion region, but will be accessible to future
long baseline experiments.


title:
Next-to-leading Order Calculation of the Color-Octet 3S1 Gluon
  Fragmentation Function for Heavy Quarkonium

abstract:
  The short-distance coefficients for the color-octet 3S1 term in the
fragmentation function for a gluon to split into heavy quarkonium states is
calculated to order alpha_s^2. The gauge-invariant definition of the
fragmentation function by Collins and Soper is employed. Ultraviolet
divergences are removed using the MS-bar renormalization procedure. The
longitudinal term in the fragmentation function agrees with a previous
calculation by Beneke and Rothstein. The next-to-leading order correction to
the transverse term disagrees with a previous calculation.


title: Chiral aspects of baryon structure in the quark model

abstract:
  The implications of chiral symmetry for the quark model are discussed. In
particular its connection with the meson-baryon approach is outlined. It is
stressed that in the closure approximation, where the intermediate baryon
states are used instead of the original quark basis, it is imperative to take
into account the whole infinite tower of the radially excited states in order
that the crucially important effects related to the short-range part of the
meson-exchange interaction be preserved. It is shown that the chiral
constituent quark model is able to explain the nucleon axial vector coupling
constant and automatically incorporates all the necessary loop corrections.


title: Pattern Formation in the Early Universe

abstract:
  Systems that exhibit pattern formation are typically driven and dissipative.
In the early universe, parametric resonance can drive explosive particle
production called preheating. The fields that are populated then decay quantum
mechanically if their particles are unstable. Thus, during preheating, a
driven-dissipative system exists. We have shown previously that pattern
formation can occur in two dimensions in a self-coupled inflaton system
undergoing parametric resonance. In this paper, we provide evidence of pattern
formation for more realistic initial conditions in both two and three
dimensions. In the one-field case, we have the novel interpretation that these
patterns can be thought of as a network of domain walls. We also show that the
patterns are spatio-temporal, leading to a distinctive, but probably
low-amplitude peak in the gravitational wave spectrum. In the context of a
two-field model, we discuss putting power from resonance into patterns on
cosmological scales, in particular to explain the observed excess power at 100
h^{-1}Mpc, but why this seems unlikely in the absence of a period of
post-preheating inflation. Finally we note our model is similar to that of the
decay of DCCs and therefore pattern formation may also occur at RHIC and LHC.


title: Higgs Decay into Gravitons: Trees and Loops

abstract:
  The decay of the Higgs particle into two gravitons was previously calculated
by us using a Born term from the Einstein field equations. Subsequently, others
computed the same decay via one loop diagrams but omitting the Born terms. Here
all of the diagrams up to one loop are discussed, and it is shown that the Born
term is overwhelmingly dominant in agreement with our original results.


title:
Extending the Frontiers - Reconciling Accelerator and Cosmic Ray p-p
  Cross Sections

abstract:
  We simultaneously fit a QCD-inspired parameterization of all accelerator data
on forward proton-proton and antiproton-proton scattering amplitudes, together
with cosmic ray data (using Glauber theory), to predict proton-air and
proton-proton cross sections at energies near \sqrt s \approx 30 TeV. The p-air
cosmic ray measurements provide a strong constraint on the inclusive particle
production cross section, as well as greatly reducing the errors on the fit
parameters---in turn, greatly reducing the errors in the high energy
proton-proton and proton-air cross section predictions.


title: On Stability of the Three 3-brane Model

abstract:
  We show that the Goldberger-Wise mechanism for the three 3-brane scenario
proposed by Kogan et al. stabilizes the radion. We find that the system of
3-branes stabilizes in such a way that the loss in the scale factor is
insignificant. That is, the negative tension brane chooses to stay close to the
visible brane.


title: Quarkonium Production through Hard Comover Scattering. II

abstract:
  We extend to large transverse momentum pt an approach to quarkonium
hadroproduction previously suggested for low pt. The dynamics involves a
perturbative rescattering of the heavy quark pair off a comoving color field
which originates from gluon radiation prior to the heavy quark production
vertex. Assuming simple properties of the comoving field we find the
rescattering scenario to be in reasonable agreement with data. At large pt,
psi' is predicted to be unpolarized, and chi1 production is favoured compared
to chi2. We predict the chi1 polarization to be transverse at low pt, and to
get a longitudinal component at large pt.


title: Mathematics for structure functions

abstract:
  We show some of the mathematics that is being developed for the computation
of deep inelastic structure functions to three loops. These include harmonic
sums, harmonic polylogarithms and a class of difference equations that can be
solved with the use of harmonic sums.


title: Dynamical gluon mass corrections in heavy quarkonia decays

abstract:
  Using the expression of the dynamical gluon mass obtained through the
operator product expansion we discuss the relevance of gluon mass effects in
the decays V -> hadrons (V = J/Psi, Upsilon). Relativistic and radiative
corrections are also introduced to calculate alpha_s(m_c) and alpha_s(m_b)
comparing them with other values available in the literature. The effects of
dynamical gluon masses are negligible for Upsilon decay but important for J/Psi
decay.


title: On the Behavior of F2 and its Logarithmic Slopes

abstract:
  It is shown that the CKMT model for the nucleon structure function F2, taken
as the initial condition for the NLO evolution equations in perturbative QCD,
provides a good description of the HERA data when presented in the form of the
logarithmic slopes of F2 vs x and Q2 (Caldwell-plot), in the whole available
kinematic ranges. Also the results obtained for the behavior of the gluon
component of a nucleon are presented.


title: Strongly-Interacting Heavy Flavors Beyond the Standard Model

abstract:
  The origin of mass must lie in physics beyond the Standard Model. Dynamical
electroweak symmetry breaking models like technicolor can generate masses for
the W and Z bosons. Providing the large top quark mass and large top-bottom
mass splitting while keeping rho parameter and flavor-changing neutral currents
small requires new strong dynamics for the top and bottom quarks. In
consequence, new particles are predicted at scales up to 10 TeV with signatures
in jets or heavy flavors. Searches for these states are underway at Fermilab
and LEP II.


title:
Higgs sector and R-parity breaking couplings in models with broken
  U(1)_B-L gauge symmetry

abstract:
  Four different supersymmetric models based on SU(2)_L X U(1)_R X U(1)_B-L and
SU(2)_L X SU(2)_R X U(1)_B-L gauge symmetry groups are studied. U(1)_B-L
symmetry is broken spontaneously by a vacuum expectation value (VEV) of a
sneutrino field. The right-handed gauge bosons may obtain their mass solely by
sneutrino VEV. The physical charged lepton and neutrino are mixtures of
gauginos, higgsinos and lepton interaction eigenstates. Explicit formulae for
masses and mixings in the physical lepton fields are found. The spontaneous
symmetry breaking mechanism fixes the trilinear R-parity breaking couplings.
Only some special R-parity breaking trilinear couplings are allowed. There is a
potentially large trilinear lepton number breaking coupling - which is unique
to left-right models - that is proportional to the SU(2)_R gauge coupling g_R.
The couplings are parametrized by few mixing angles, making the spontaneous
R-parity breaking a natural ``unification framework'' for R-parity breaking
couplings in SUSYLR models.


title: Limits on the size of extra dimensions

abstract:
  We give a brief summary of present bounds on the size of possible
extra-dimensions from collider experiments.


title:
The mixing of the f0(1370), f0(1500) and f0(1710) and the search for the
  scalar glueball

abstract:
  For the first time a complete data set of the two-body decays of the
f0(1370), f0(1500) and f0(1710) into all pseudoscalar mesons is available. The
implications of these data for the flavour content for these three f0 states is
studied. We find that they are in accord with the hypothesis that the scalar
glueball of lattice QCD mixes with the qqbar nonet that also exists in its
immediate vicinity. We show that this solution also is compatible with the
relative production strengths of the f0(1370), f0(1500) and f0(1710) in pp
central production, ppbar annihilations and J/psi radiative decays.


title: Pair production of neutralinos via photon-photon collisions

abstract:
  We investigated the production of neutralino pairs via photon-photon
collisions in the minimal supersymmetric model(MSSM) at future linear
colliders. The numerical analysis of their production rates is carried out in
the mSUGRA scenario. The results show that this cross section can reach about
18 femto barn for $\tilde{\chi}^{0}_{1} \tilde{\chi}^{0}_{2}$ pair production
and 9 femto barn for $\tilde{\chi}^{0}_{2}\tilde{\chi}^{0}_{2}$ pair production
with our chosen input parameters.


title: Natural Chaotic Inflation in Supergravity

abstract:
  We propose a chaotic inflation model in supergravity. In the model the
K\"ahler potential has a Nambu-Goldstone-like shift symmetry of the inflaton
chiral multiplet which ensures the flatness of the inflaton potential beyond
the Planck scale. We show that the chaotic inflation naturally takes place by
introducing a small breaking term of the shift symmetry in the superpotential.
This may open a new branch of model building for inflationary universe in the
framework of supergravity.


title: The CKM phase $\alpha$ through $B \to a_0 \pi$

abstract:
  We propose the decay modes $B \to a_0 (\to \eta \pi) \pi$ to determine the
CKM phase $\alpha$. One can analyze these modes through (i) the $B \to a_0 \pi$
isospin pentagon, (ii) the time dependent Dalitz plot of $B^0(t) \to a_0^{\pm}
\pi^{\mp} \to \eta \pi^+ \pi^-$, and (iii) the time dependence of $B^0(t) \to
a_0^0 (\to \eta \pi^0) \pi^0$. We show that the $a_0 \pi$ modes have certain
advantages as compared to the $\rho \pi$ modes, and strongly recommend the time
dependent Dalitz plot analysis in the $a_0 \pi$ channel.


title: Spontaneous CP Violation in the Left-Right-Symmetric Model

abstract:
  We investigate the pattern of CP violation in \Kd, \Bd and \Bs mixing in a
symmetrical \model model with spontaneous CP violation. Performing a careful
analysis of all relevant restrictions on the model's parameters from $\Delta
M_K$, $\Delta M_{B_d}$, $\Delta M_{B_s}$, $\epsilon_K$, the sign of \ee and the
mixing-induced CP asymmetry in \goldd, we find that the mass of the
right-handed charged gauge-boson, $M_2$, is restricted to be in the range 2.75
to 13$ $TeV, and that the mass of the flavour-changing neutral-Higgs bosons,
$M_H$, must be between 10.2 to 14.6$ $TeV. We also find that the model,
although still compatible with present experimental data, cannot accomodate the
SM prediction of large CP violation in \goldd, but, on the other hand, predicts
a large CP-asymmetry of ${\cal O}(40%)$ in \golds. These specific predictions
make it possible to submit the model to a scrupulous test at B factories and
hadron colliders.


title:
Semileptonic inclusive heavy meson decay: duality in a nonrelativistic
  potential model in the Shifman-Voloshin limit

abstract:
  Quark-hadron duality in the inclusive semileptonic decay $B\to X_c l\nu$ in
the Shifman-Voloshin limit $\Lambda \ll \delta m=m_b - m_c \ll m_b, m_c$ is
studied within a nonrelativistic potential model. The integrated semileptonic
decay rate is calculated in two ways: first, by constructing the Operator
Product Expansion, and second by a direct summation of the exclusive channels.
Sum rules (Bjorken, Voloshin, etc.) for the potential model are derived,
providing a possibility to compare the two representations for $\Gamma(B\to X_c
l\nu)$. An explicit difference between them referred to as duality-violation
effect is found. The origin of this effect is related to higher charm
resonances which are kinematically forbidden in the decay process but are
nevertheless picked up by the OPE.
  Within the considered $1/m_c^2$ order the OPE and the sum over exclusive
channels match each other, up to the contributions of higher resonances, by
virtue of the sum rules. In particular this is true for the terms of order
$\delta m^2/m_c^2$ and $\Lambda \delta m/m_c^2$ which are present in each of
the decay channels and cancel in the sum of these channels due to the Bjorken
and Voloshin sum rules, respectively. The size of the duality violation effects
is estimated to be of the order $O(\Lambda^{2+b}/m_c^2\delta m^b)$ with $b>0$
depending on the details of the potential. Constraints for a better accuracy
are discussed.


title:
New QCD estimate of the kaon penguin matrix elements and
  epsilon'/epsilon

abstract:
  Firstly, we use the recent ALEPH/OPAL data on the V-A spectral functions for
fixing the continuum threshold with which the first and second Weinberg sum
rules should be satisfied in the chiral limit. Then, we predict the values of
the low-energy constants m_{\pi^+}-m_{\pi^0}, {L}_{10}, and test the values of
the electroweak kaon penguin matrix elements <Q^{3/2}_{8,7}>_{2\pi} obtained
from DMO--like sum rules. Secondly, we use the data on the \tau-total hadronic
width R_{\tau,V/A} for extracting <Q_8^{3/2}_{2\pi}>, in the {MS}\bar scheme,
and propose some new sum rules for < Q_7^{3/2}>_{2\pi} in the chiral limit,
where the latter require more accurate data for the spectral functions near the
$\tau$-mass. Thirdly, we analyze the effects to the matrix element
<Q_6^{1/2}>_{2\pi}, of the S_2\equiv(\bar uu+\bar dd) component of the I=0
scalar meson, with its parameters fixed from QCD spectral sum rules. Our
results should stimulate a further attention on the r\^ole of the (expected
large) gluonium component of the I=0 scalar meson and of the associated
operator in the K--->\pi\pi amplitude. Finally, using our previous
determinations, we deduce, in the Standard Model (SM), the conservative upper
bound for the CP-violating ratio: \epsilon'/\epsilon < (22\pm 9) 10^{-4}, which
is in agreement with the present measurements.


title:
Supersymmetric Electroweak Corrections to $W^{\pm}H^{\mp}$ Associated
  Production at the CERN Large Hadron Collider

abstract:
  The $O(\alpha_{ew}m_{t(b)}^{2}/m_{W}^{2})$ and $O(\alpha_{ew}
m_{t(b)}^4/m_W^4)$ supersymmetric electroweak corrections to the cross section
for $W^{\pm}H^{\mp}$ associated production at the LHC are calculated in the
minimal supersymmetric standard model. Those corrections arise from the quantum
effects which are induced by the Yukawa couplings from the Higgs sector and the
genuine supersymmetric electroweak couplings involving supersymmetric
particles, i.e. chargino-top(bottom)-sbottom(stop) couplings,
neutralino-top(bottom)-stop(sbottom) couplings and charged Higgs-stop-sbottom
couplings. The Yukawa corrections can decrease the total cross sections
significantly for low $\tan\beta(<4)$ when $m_{H^+}<300$GeV, which exceed -12%.
For high $\tan\beta$ the Yukawa corrections become negligibly small. The
genuine supersymmetric electroweak corrections can increase or decrease the
total cross sections depending on the supersymmetric parameters, which are at
most a few percent, except the region near the threshold. We also show that the
genuine supersymmetric electroweak corrections depend strongly on the choice of
$\tan\beta$, $A_t$, $M_{\tilde Q}$ and $\mu$. For large values of $A_t$, or
large values of $\mu$ and $\tan\beta$, one can get larger corrections. The
corrections can become very small, in contrast, for larger values of $M_{\tilde
Q}$.


title: Answering the Sphinx's Questions on Neutrinos

abstract:
  In answering the difficult questions on neutrinos asked by Sphinx I argue
that search for proton decay is the most important experiment in coming 5-10
years. I also emphasize the crucial importance of the neutrinoless double beta
decay with sensitivity of <m_{\nu e}> \sim 0.01 eV level as the unique feasible
way of directly detecting neutrinos of atmospheric mass scale in laboratories.
I point out that, if observed at this level, it means not only that neutrinos
are Majorana particle but also that they must obey an inverted mass hierarchy.


title:
The imprints of nonextensive statistical mechanics in high energy
  collisions

abstract:
  To describe high energy collisions one widely uses thermodynamical methods
and concepts which follow the classical Boltzmann-Gibbs (BG) approach. In many
cases, however, either some deviations from the expected behaviour are observed
experimentally or it is known that the conditions necessary for BG to apply are
satisfied only approximately. In other branches of physics where such
situations are ubiquitous, the popular remedy is to resort, instead, to the so
called nonextensive statistics, the most popular example of which is Tsallis
statistics. We shall provide here an overview of possible imprints of
non-extensitivity existing both in high energy cosmic ray physics and in
multiparticle production processes in hadronic collisions, in particular in
heavy ion collisions. Some novel proposition for the interpretation of the
nonextensitivity parameter q present in such circumstances will be discussed in
more detail.


title:
Polarised parton densities from the fits to the deep inelastic spin
  asymmetries on nucleons

abstract:
  We have made next to leading order QCD fit to the deep inelastic spin
asymmetries on nucleons and we have determined polarised quark and gluon
densities. The functional form for such distributions was inspired by the
unpolarised ones given by MRST (Martin, Roberts, Stirling and Thorne) fit. In
addition to usually used data points (averaged over $Q^2$) we have also
considered the sample containing points with the same $x$ and different $Q^2$.
Our fits to both groups of data give very similar results. For the integrated
quantities we get rather small gluon polarisation. For the non averaged data
the best fit is obtained with vanishing gluon contribution at $ Q^{2}=1 {\rm
GeV^{2}}$. For comparison models with alternative assumptions about quark sea
and in particular strange sea behaviour are discussed.


title: N* Spectrum in Lattice QCD

abstract:
  We investigate the mass of the parity partner $N^* (1/2^{-})$ of the nucleon
$N(1/2^{+})$, in lattice QCD using a new lattice discretization scheme for
fermions, domain wall fermions (DWF). DWF possess exact chiral symmetry and
flavor symmetry, both of which are required for this problem, even at finite
lattice spacing. Our calculation reproduces the large mass splitting between
those two states, in good agreement with experiment. We also present
preliminary results for the mass of the positive-parity excited state
$N'(1/2^{+})$.


title: The PSI np data and their effect on the charge Pi-N-N coupling constant

abstract:
  Differential cross sections of elastic neutron-proton scattering have been
measured for the energy range from 200 MeV to 580 MeV. The angular interval for
the detection of the recoiling proton ranges up to 48 degree in the laboratory
system. This corresponds to an interval of the scattering angle from 80 degree
to 180 degree in the centre-of-mass system. For absolute normalization the
simultaneously measured np --> d Pi^o reaction was used above 280 MeV. The
charged Pi-NN coupling constant has been determined to f^2_{Pi-n-p} =
0.076+-0.001.


title:
Unified treatment of $A+B\to 0 $ and $A+A\to 0$ chemical reactions
  through Thompson's approach

abstract:
  In this work we propose an action to describe diffusion limited chemical
reactions belonging to various classes of universality. This action is treated
through Thompson's approach and can encompass both cases where we have
segregation as in the $A+B\to 0$ reaction, as well the simplest one, namely the
$A+A\to 0$ reaction .Our results for long time and long wavelength behaviors of
the species concentrations and reaction rates agree with exact results of
Peliti for $A+A\to 0$ reaction and rigorous results of Bramson and Lebowitz for
$A+B\to 0$ reaction, with equal initial concentrations.The different classes of
universality are reflected by the obtained upper critical dimensions varying
continuously from $d_{c}=2$ in the first case to $d_{c}=4$ in the last one.
Just at the upper critical dimensions we find universal logarithmic corrections
to the mean field behavior.


title: Using the value of beta to help determine gamma from B decays

abstract:
  It has been pointed out by Gronau and Rosner that the angle gamma of the
unitarity triangle could be determined by combining future results on B_s and
B_d decays to K pi. Here we show that it is important to include in the
analysis the information on the phase beta which will be determined in the near
future. Omitting this information could lead to an error as large as 8 degrees
in gamma.


title: Probing Left-handed Slepton Flavor Mixing at Future Lepton Colliders

abstract:
  It has been argued in the literature that the search for the slepton
oscillation phenomenon can be a powerful probe of intergenerational mixing
between sleptons, once sleptons are found at future colliders. In this article
we estimate possible reach of future lepton colliders in probing left-handed
slepton flavor mixing, especially mixing between the first and third
generations, on which constraints imposed by other processes like $\tau \to e
\gamma$ are very weak. $e^+e^-$ collider is suitable for this purpose, since it
can produce, if kinematically allowed, sleptons of the first generation via
t-channel, in addition to s-channel. Utilizing $e^+e^- \to \tau e + 4jets + \E$
signal at $e^+e^-$ linear collider with integrated luminosity L=50 fb^{-1}(500
fb^{-1}) it may be possible to reach mixing angle $\sin 2\theta_{\tilde{\nu}}
\gtrsim 0.06 (0.04)$ and mass difference $\Delta m_{\tilde{\nu}} \gtrsim 0.07
(0.04)$ GeV for sneutrinos in the first and third generations at the
statistical significance of 5 \sigma.


title: Inclusive weak decay rates of heavy hadrons

abstract:
  A compact review of the theory, including some recent developments, of
inclusive weak decay rates of charmed and b hadrons with an emphasis on
predictions that can be tested in the forthcoming experiments.


title:
Space-time Autocorrelations and Hubble Flow: Probing Small Length Scales
  in Heavy Ion Collisions

abstract:
  We extend the usual treatment of two-particle momentum correlations to
include the possibility of non-chaotic or correlated particle emission from the
hadronic freeze-out surface in heavy-ion collisions. We adopt a modified
two-particle emission density which permits the description of nontrivial
differences between pair autocorrelations for different pair types. If
different pair types sample nuclear radial or Hubble flow in different ways we
predict a unique signature in two-particle momentum distributions. Analysis of
such effects may provide detailed information on the small-scale structure of
the freeze-out surface.


title: The QCD phase transition in the inhomogeneous Universe

abstract:
  We investigate a new mechanism for the cosmological QCD phase transition:
inhomogeneous nucleation. The primordial temperature fluctuations, measured to
be $\delta T/T \sim 10^{-5}$, are larger than the tiny temperature interval, in
which bubbles would form in the standard picture of homogeneous nucleation.
Thus the bubbles nucleate at cold spots. We find the typical distance between
bubble centers to be a few meters. This exceeds the estimates from homogeneous
nucleation by two orders of magnitude. The resulting baryon inhomogeneities may
affect primordial nucleosynthesis.

categories: hep-ph astro-ph cond-mat.stat-mech nucl-th


title: Vacuum selection by recollapsing

abstract:
  We discuss the possibility that the vacuum is dynamically determined in the
history of the universe. The point is that some of the bubbles with a certain
vacuum shrink by the evolution of the universe via gravity and may become black
holes. When the temperature of the phase transition T_{PT} is higher than 10^9
GeV, these black holes evaporate until now. If T_{PT}<10^9 GeV, we may see
these black holes in our universe. It is interesting that in many cases false
vacua are favored in the context of cosmology. By using this argument,
supersymmetry(SUSY), if it exists, can be broken cosmologically. We can guess
the SUSY breaking scale from the mass of the black holes.


title: Four-quark state in QCD

abstract:
  The spectra of some 0++ four-quark states, which are composed of \bar qq
pairs, are calculated in QCD. The light four-quark states are calculated using
the traditional sum rules while four-quark states containing one heavy quark
are computed in HQET. For constructing the interpolating currents, different
couplings of the color and spin inside the \bar qq pair are taken into account.
It is found that the spin and color combination has little effect on the mass
of the four-quark states.


title:
Exclusive semileptonic rare decays $B ->_ ($K,K^*) \ell^+ \ell^- in
  supersymmetric theories

abstract:
  The invariant mass spectrum, forward-backward asymmetry, and lepton
polarizations of the exclusive processes $B\to K(K^*)\ell^+ \ell^-, \ell=\mu,
\tau$ are analyzed under supersymmetric context. Special attention is paid to
the effects of neutral Higgs bosons (NHBs). Our analysis shows that the
branching ratio of the process $\bkm$ can be quite largely modified by the
effects of neutral Higgs bosons and the forward-backward asymmetry would not
vanish. For the process $\bksm$, the lepton transverse polarization is quite
sensitive to the effects of NHBs, while the invariant mass spectrum,
forward-backward asymmetry, and lepton longitudinal polarization are not. For
both $\bkt$ and $\bkst$, the effects of NHBs are quite significant. The partial
decay widths of these processes are also analyzed, and our analysis manifest
that even taking into account the theoretical uncertainties in calculating weak
form factors, the effects of NHBs could make SUSY shown up.


title:
Towards a solution of the charmonium production controversy:
  k_t-factorization versus color octet mechanism

abstract:
  The cross section of \chi_{cJ} hadroproduction is calculated in the
k_t-factorization approach. We find a significant contribution of the \chi_{c1}
state due to non-applicability of the Landau-Yang theorem because of off-shell
gluons. The results are in agreement with data and, in contrast to the
collinear factorization, show a dominance of the color singlet part and a
strong suppression of the color octet contribution. Our results could therefore
lead to a solution of the longstanding controversy between the color singlet
model and the color octet mechanism.


title: Lifetime-difference pattern of heavy hadrons

abstract:
  The preasymptotic effects originating from the four-quark operators are
disentangled from the other contributions by considering appropriate
combinations of inclusive decay rates. Under the assumption of the isospin and
heavy-quark symmetry, a set of relations connecting charmed and beauty decays
is obtained without invoking specific models. The results are compared with
other approaches and confronted with experiment.


title:
The Radiative Leptonic $B_{c}\to \tau\bar{\nu_{\tau}}\gamma$ Decay in
  Two Higgs Doublet Model

abstract:
  The radiative leptonic $B_{c}\to\tau\bar{\nu_{\tau}}\gamma$ decay is analysed
in context of 2HDM. It is shown that with large values of $tan\beta$, the
contributions of Model II to the decay rate exceeds considerably the Standard
Model ones, while the contributions of Model I overlap with the Standard Model
predictions.


title: Proton Decay in the Supersymmetric Grand Unified Models

abstract:
  In this article we review proton decay in the supersymmetric grand unified
models.


title: Order alpha^3 ln(1/alpha) Corrections to Positronium Decays

abstract:
  The logarithmically enhanced alpha^3 ln(1/alpha) corrections to the para- and
orthopositronium decay widths are calculated in the framework of dimensionally
regularized nonrelativistic quantum electrodynamics.In the case of
parapositronium, the correction is negative, approximately doubles the effect
of the leading logarithmic alpha^3 ln^2(1/alpha) one, and is comparable to the
nonlogarithmic O(alpha^2) one. As for orthopositronium, the correction is
positive and almost cancels the alpha^3 ln^2(1/alpha) one. The uncertainties in
the theoretical predictions for the decay widths are reduced.


title: A new global analysis of DIS data and the strange sea distribution

abstract:
  We present the results of a new global analysis of DIS data characterized by
an enlarged neutrino and antineutrino data set. Special emphasis is given to
the strange sector. The strange sea distribution is determined independently of
the non strange sea. The possibility of a charge asymmetry, s(x) different from
sbar(x), is tested.


title: Primordial magnetic fields from inflation?

abstract:
  The hot plasma above the electroweak scale contains (hyper) charged scalar
particles which are coupled to Abelian gauge fields. Scalars may interact with
gravity in a non-conformally invariant way and thus their fluctuations can be
amplified during inflation. These fluctuations lead to creation of electric
currents and produce inhomogeneous distribution of charge density, resulting in
the generation of cosmological magnetic fields. We address the question whether
these fields can be coherent at large scales so that they may seed the galactic
magnetic fields. Depending upon the mass of the charged scalar and upon various
cosmological (critical fraction of energy density in matter, Hubble constant)
and particle physics parameters we found that the magnetic fields generated in
this way are much larger than vacuum fluctuations. However, their amplitude on
cosmological distances is found to be too small for seeding the galactic
magnetic fields.


title: APACIC++, A PArton Cascade In C++, version 1.0

abstract:
  APACIC++ is a Monte-Carlo event-generator dedicated for the simulation of
electron-positron annihilations into jets. Within the framework of APACIC++,
the emergence of jets is identified with the perturbative production of partons
as governed by corresponding matrix elements. In addition to the build-in
matrix elements describing the production of two and three jets, further
programs can be linked allowing for the simultaneous treatment of higher
numbers of jets. APACIC++ hosts a new approach for the combination of arbitrary
matrix elements for the production of jets with the parton shower, which in
turn models the evolution of these jets. For the evolution, different ordering
schemes are available, namely ordering by virtualities or by angles. At the
present state, the subsequent hadronization of the partons is accomplished by
means of the Lund-string model as provided within Pythia. An appropriate
interface is provieded.
  The program takes full advantage of the object-oriented features provided by
C++ allowing for an equally abstract and transparent programming style.


title: Why the Four SM Families

abstract:
  The flavor democracy favors the existence of the nearly degenerate fourth SM
family, whereas the fifth SM family is disfavored both by the mass
phenomenology and precision tests of the Standard Model. The multi-hundreds GeV
fourth family quarks will be copiously produced at the LHC. However, the first
indication of the fourth family may come from the Higgs search at the upgraded
Tevatron.


title:
A Phenomenological Expression for Deuteron Electromagnetic Form Factors
  Based on Perturbative QCD Predictions

abstract:
  For deuteron electromagnetic form factors,perturbative QCD(pQCD) predicts
that $G^{+}_{00}$ becomes the dominate helicity amplitude and that $G^{+}_{+0}$
and $G^{+}_{+-}$ are suppressed by factors $\Lambda_{\rm QCD}/Q$ and
$\Lambda_{\rm QCD}^2/Q^2$ at large $Q^2$,respectively. We try to discuss the
higher order corrections beyond the pQCD asymptotic predictions by
interpolating an analytical form to the intermediate energy region. From
fitting the data,our results show that the helicity-zero to zero matrix element
$G^{+}_{00}$ dominates the gross structure function $A(Q^2)$ in both of the
large and intermediate energy regions; it is a good approximation for
$G^{+}_{+-}$ to ignore the higher order contributions and the higher order
corrections to $G^{+}_{+0}$ should be taken into account due to sizeable
contributions in the intermediate energy region.


title: Metastable States of a Coupled Pair on a Repulsive Barrier

abstract:
  Resonance penetration of two coupled particles through a repulsive barrier is
considered. It is shown that a local minimum of the total potential generates
metastable bound states, and their spectrum determines the position of
resonances in the penetration probability. It is pointed out that the
probabilities of tunneling of two interacting particles from the false vacuum
can be essentially higher than it has been assumed earlier.


title:
Approximately self-consistent resummations for the thermodynamics of the
  quark-gluon plasma. I. Entropy and density

abstract:
  We propose a gauge-invariant and manifestly UV finite resummation of the
physics of hard thermal/dense loops (HTL/HDL) in the thermodynamics of the
quark-gluon plasma. The starting point is a simple, effectively one-loop
expression for the entropy or the quark density which is derived from the fully
self-consistent two-loop skeleton approximation to the free energy, but subject
to further approximations, whose quality is tested in a scalar toy model. In
contrast to the direct HTL/HDL-resummation of the one-loop free energy, in our
approach both the leading-order (LO) and the next-to-leading order (NLO)
effects of interactions are correctly reproduced and arise from kinematical
regimes where the HTL/HDL are justifiable approximations. The LO effects are
entirely due to the (asymptotic) thermal masses of the hard particles. The NLO
ones receive contributions both from soft excitations, as described by the
HTL/HDL propagators, and from corrections to the dispersion relation of the
hard excitations, as given by HTL/HDL perturbation theory. The numerical
evaluations of our final expressions show very good agreement with lattice data
for zero-density QCD, for temperatures above twice the transition temperature.


title: Scalar Gluonium and Instantons

abstract:
  The impact of QCD instantons on scalar glueball properties is studied in the
framework of an instanton-improved operator product expansion (IOPE) for the
0^{++} glueball correlation function. Direct instanton contributions are found
to strongly dominate over those from perturbative fluctuations and soft vacuum
fields. All IOPE sum rules, including the one involving a subtraction constant,
show a high degree of stability and are, in contrast to previous glueball sum
rules, consistent with the low-energy theorem for the zero-momentum correlator.
The predicted glueball mass m_{G}=1.53 \pm 0.2 GeV is less sensitive to the
instanton contributions then the glueball coupling (residue) f_{G}=1.01\pm 0.25
GeV, which increases by about half an order of magnitude. Both glueball
properties are shown to obey scaling relations as a function of the average
instanton size and density.


title: Lattice simulation of the strange quark mass and Fritzsch texture

abstract:
  We discuss how predictions of Fritzsch textures can be consistent with values
of fermion masses and mixing angles if we embed them in a supersymmetric grand
unified theory.


title:
Analysis of the Decays B-> \pi \pi and \pi K with QCD Factorization in
  the Heavy Quark Limit

abstract:
  In this work, we calculate the branching ratios and CP asymmetries of the
decays of $B \to \pi \pi$ and $\pi K$ in the frame of QCD factorization in the
heavy quark limit. We also compare the results with the estimates by using
conventional factorization and experimental measurements.


title:
Physics potential at a neutrino factory: can we benefit from more than
  just detecting muons?

abstract:
  In order to fully address the oscillation processes at a neutrino factory, a
detector should be capable of identifying and measuring all three charged
lepton flavors produced in charged current interactions {\it and} of measuring
their charges to discriminate the incoming neutrino helicity. This is an
experimentally challenging task, given the required detector mass for
long-baseline experiments. We address the benefit of a high-granularity,
excellent-calorimetry non-magnetized target-detector, which provides a
background-free identification of electron neutrino charged current and a
kinematical selection of tau neutrino charged current interactions. We assume
that charge discrimination is only available for muons reaching an external
magnetized-Fe spectrometer. This allows the clean classification of events into
electron, right-sign muon, wrong-sign muon and no-lepton categories. In
addition, high granularity permits a clean detection of quasi-elastic events,
which by detecting the final state proton, provide a selection of the neutrino
electron helicity without the need of an electron charge measurement. From
quantitative analyses of neutrino oscillation scenarios, we conclude that in
many cases the discovery sensitivities and the measurements of the oscillation
parameters are dominated by the ability to measure the muon charge. However, we
identify cases where identification of electron and tau samples contributes
significantly.


title: The Effect of a Small Mixing Angle in the Atmospheric Neutrinos

abstract:
  The effect of matter enhanced neutrino oscillations on atmosheric neutrinos
is investigated systematically in the framework of one mass dominant model of
three neutrinos. The resonance conditions of neutrino crossing the earth are
determined by the three parameters, namely, the zenith angle, ${\Delta m^2/E}$,
and the mixing angle ${\theta_3}$ of the electron neutrinos with tau neutrinos.
The values of the triplet under the resonance is found numerically.


title: Infrared alignment of SUSY flavor structures

abstract:
  The various experimental bounds on flavor-changing interactions severely
restrict the low-energy flavor structures of soft supersymmetry breaking
parameters. In this work, we show that with a particular assumption of Yukawa
couplings, the fermion mass and sfermion soft mass matrices are simultaneously
diagonalized by common mixing matrices and we then obtain an alignment solution
for the flavor problems. The required condition is generated by renormalization
group evolutions and achieved at low-energy scale independently of high-energy
structures of couplings. In this case, the diagonal entries of the soft scalar
mass matrices are determined by gaugino and Higgs soft masses. We also discuss
possible realizations of this scenario and the characteristic sparticle
spectrum in the models.


title: On transverse energy production in hadron collisions

abstract:
  The transverse energy spectrum in the unit rapidity window in p-bar p
collisions at 540 GeV c.m.s energy is calculated to the next-to-leading order
accuracy O(a_s^3) and compared to the experimental data by UA(2) collaboration.
We show that the calculated spectrum starts matching experimental data only at
relatively large transverse energy Et=60 GeV and is in essential disagreement
with it both in shape and magnitude at lower transverse energies. The data are
well reproduced by HIJING Monte-Carlo generator indicating the crucial
importance of all-order effects in perturbation theory as well as those of
hadronization in describing the transverse energy production in hadron
collisions at small and intermediate transverse energies.


title: Overview of Neutrino Oscillation Physics

abstract:
  Recent evidence for neutrino oscillations has revolutionized the study of
neutrino masses and mixing. This report gives an overview of what we are
learning from the neutrino oscillation experiments, the prospects for the near
term, and the bright future of neutrino mass studies.


title: Neutrino Oscillations Experiments at Fermilab

abstract:
  Neutrino oscillations provide an unique opportunity to probe physics beyond
the Standard Model. Fermilab is constructing two new neutrino beams to provide
a decicive test of two of the recent positive indications for neutrino
oscillations: MiniBOONE experiment will settle the LSND controversy, MINOS will
provide detailed studies of the region indicated by the SuperK results.


title: CP Asymmetries in Radiative B Decays with R-parity Violation

abstract:
  We analyze the effect of R-parity violation in the minimal supersymmetric
standard model on the CP asymmetries in $b\to s \gamma$ decay. The direct and
mixing-induced CP asymmetries arising from the lepton number violating
couplings are strongly constrained by the current experimental limits on the
corresponding couplings. Allowing a heavy neutrino ($m_{\nu_\tau}\sim10$ keV)
and a moderate mass splitting of sfermions, the direct CP asymmetry around 15 %
and the nearly maximal mixing-induced CP asymmetry ($\sim 100 %$) can be
realized, depending on the R-parity conserving contributions to the radiative
$b$ decay. With the baryon number violating couplings, only the mixing-induced
CP asymmetry arises and it can be maximal provided there is a the similar
sfermion mass splitting.


title: B->rho pi and the unitary angle alpha

abstract:
  The role of the decay mode B->rho pi for the determination of the unitarity
angle alpha is critically examined in view of the smaller than expected ratio
B(B->rho+/- pi-/+)/B(B->rho0 pi+/-) found by the CLEO collaboration.


title: Phenomenological Consequences of Right-handed Down Squark Mixings

abstract:
  The mixings of $d_R$ quarks, hidden from view in Standard Model (SM), are
naturally the largest if one has an Abelian flavor symmetry. With supersymmetry
(SUSY) their effects can surface via $\tilde d_R$ squark loops. Squark and
gluino masses are at TeV scale, but they can still induce effects comparable to
SM in $B_d$ (or $B_s$) mixings, while $D^0$ mixing could be close to recent
hints from data. In general, CP phases would be different from SM, as may be
indicated by recent B Factory data. Presence of non-standard soft SUSY
breakings with large $\tan\beta$ could enhance $b\to d\gamma$ (or $s\gamma$)
transitions.


title: Eikonal Scattering of Monopoles and Dyons in Dual QED

abstract:
  The quantum field theory of electron-point magnetic monopole interactions and
dyon-dyon interactions, based on the string-dependent ``nonlocal'' action of
Dirac and Schwinger is developed. We demonstrate that a nonperturbative quantum
field theoretic formulation can be constructed resulting in a string {\em
independent} cross section for monopole-electron and dyon-dyon scattering. Such
calculations can be done only by using nonperturbative approximations such as
the eikonal and not by some mutilation of lowest-order perturbation theory.


title: The form factor of the transition gamma gamma * pi^0

abstract:
  A simple method is used to extrapolate the form factor for the process gamma*
gamma *--->pi^0 when two virtual photons produce a pi ^0 from the region of
large spacelike photon virtualities to the experimentally accessible case when
one of the photons is real. The method is also applied to the study of the
axial anomaly and omega -rho -pi coupling and to the pion charge and charge
radius. The results compare favourably with the experimental measurements.


title: T-Odd Triple-Product Correlations in Hadronic b Decays

abstract:
  We study T-violating triple-product asymmetries in the quark-level decay b ->
s u u(bar) within the standard model (SM). We find that only two types of
triple products are non-negligible. The asymmetry in p_u . [s_u x s_u(bar)] or
p_u(bar) . [s_u x s_u(bar)] can be as large as about 5%. It can be probed in B
-> V_1 V_2 decays, where V_1 and V_2 are vector mesons. And the asymmetry in
s_b . [p_u x p_s] can be in the range 1%--3%. One can search for this signal in
the decay \Lambda_b -> \Lambda \pi^+ \pi^- or in B^* -> X_s X, where X_s and X
then each decay into two mesons. All other triple-product asymmetries are
expected to be small within the SM. This gives us new methods of searching for
new physics.


title: Doubly heavy baryons Omega_QQ' vs. Xi_QQ' in sum rules of NRQCD

abstract:
  In the framework of two-point sum rules of NRQCD, the masses and couplings of
doubly heavy baryons to the corresponding quark currents are evaluated with
account of coulomb-like corrections in the system of doubly heavy diquark as
well as the contribution of nonperturbative terms determined by the quark,
gluon, mixed condensates and the product of gluon and quark condensates. The
introduction of nonzero light quark mass destroys the factorization of baryon
and diquark correlators even at the perturbative level and provides the better
convergency of sum rules. We estimate the difference M_Omega - M_Xi = 100+/- 10
MeV. The ratio of baryonic constants |Z_Omega|^2/|Z_Xi|^2 is equal to 1.3+/-0.2
indicating the violation of SU(3) flavor symmetry for the doubly heavy baryons.


title: Heavy quark potential in the static limit of QCD

abstract:
  Following the procedure and motivations developed by Richardson, Buchmuller
and Tye, we derive the potential of static quarks consistent with both the
three-loop running of QCD coupling constant under the two-loop perturbative
matching of V and MS-bar schemes and the confinement regime at long distances.
Implications for the heavy quark masses as well as the quarkonium spectra and
leptonic widths are discussed.


title: Cold Dark Matter and b --> s gamma in the Horava-Witten Theory

abstract:
  The minimal supersymmetric standard model with complete, partial or no Yukawa
unification and radiative electroweak breaking with boundary conditions from
the Horava-Witten theory is considered. The parameters are restricted by
constraining the lightest sparticle relic abundance by cold dark matter
considerations and requiring the b-quark mass after supersymmetric corrections
and the branching ratio of b --> s gamma to be compatible with data. Complete
Yukawa unification can be excluded. Also, t-b Yukawa unification is strongly
disfavored since it requires almost degenerate lightest and next-to-lightest
sparticle masses. However, the b-tau or no Yukawa unification cases avoid this
degeneracy. The latter with mu<0 is the most natural case. The lightest
sparticle mass, in this case, can be as low as about 77 GeV.


title:
Are neutral Goldstone bosons initiating very energetic air showers and
  anomalous multiple-core structure as a component of cosmic rays?

abstract:
  We consider two recently accentuated, unusual empirical results concerning
cosmic-ray events at high energies. We show that the possibility for a
correlated explanation is provided by new dynamics which arises from collisions
of a neutral Goldstone boson as a component of the highest-energy cosmic rays.


title: Charge Asymmetries in charm photoproduction

abstract:
  Charm quarks are expected to be produced mainly by the photon-gluon fusion
mechanism in photon-Nucleon interactions. However, a small part of the total
charm cross section originates in similar processes to those appearing in charm
hadroproduction through the resolved (hadronic) component of the photon.
Although the contribution of the resolved part of the photon is small at fixed
target energies, it can help to understand the small but sizeable charge
asymmetries measured in charm hadron photoproduction experiments.


title: Physics Impact of GigaZ

abstract:
  By running the prospective high-energy e^+ e^- collider TESLA in the GigaZ
mode on the Z resonance, experiments can be performed on the basis of more than
10^9 Z events. They will allow the measurement of the effective electroweak
mixing angle to an accuracy of approximately +- 10^-5. Likewise the W boson
mass is expected to be measurable with an error of about 6 MeV near the W^+ W^-
threshold. In this note, we study the accuracy with which the Higgs boson mass
can be determined from loop corrections to these observables in the Standard
Model. The comparison with a directly observed Higgs boson may be used to
constrain new physics scales affecting the virtual loops. We also study
constraints on the heavy Higgs particles predicted in the Minimal
Supersymmetric Standard Model, which are very difficult to observe directly for
large masses. Similarly, it is possible to constrain the mass of the heavy
scalar top particle.


title: QCD

abstract:
  We discuss issues of QCD at the LHC including parton distributions, Monte
Carlo event generators, the available next-to-leading order calculations,
resummation, photon production, small x physics, double parton scattering, and
backgrounds to Higgs production.


title: $D^*D\pi$ and $B^*B\pi$ form factors from QCD Sum Rules

abstract:
  The $H^*H\pi$ form factor for H = B and D mesons is evaluated in a QCD sum
rule calculation. We study the Borel sum rule for the three point function of
two pseudoscalar and one vector meson currents up to order four in the operator
product expansion. The double Borel transform is performed with respect to the
heavy meson momenta. We discuss the momentum dependence of the form factors and
two different approaches to extract the $H^*H\pi$ coupling constant.


title:
Yukawa Unified Supersymmetric SO(10) Model: Cosmology, Rare Decays and
  Collider Searches

abstract:
  It has recently been pointed out that viable sparticle mass spectra can be
generated in Yukawa unified SO(10) supersymmetric grand unified models
consistent with radiative breaking of electroweak symmetry. Model solutions are
obtained only if $\tan\beta \sim 50$, $\mu <0$ and positive $D$-term
contributions to scalar masses from SO(10) gauge symmetry breaking are used. In
this paper, we attempt to systematize the parameter space regions where
solutions are obtained. We go on to calculate the relic density of neutralinos
as a function of parameter space. No regions of the parameter space explored
were actually cosmologically excluded, and very reasonable relic densities were
found in much of parameter space. Direct neutralino detection rates could
exceed 1 event/kg/day for a $^{73}$Ge detector, for low values of GUT scale
gaugino mass $m_{1/2}$. We also calculate the branching fraction for $b\to s
\gamma$ decays, and find that it is beyond the 95% CL experimental limits in
much, but not all, of the parameter space regions explored. However, recent
claims have been made that NLO effects can reverse the signs of certain
amplitudes in the $b\to s\gamma$ calculation, leading to agreement between
theory and experiment in Yukawa unified SUSY models. For the Fermilab Tevatron
collider, significant regions of parameter space can be explored via
$b\bar{b}A$ and $b\bar{b}H$ searches. There also exist some limited regions of
parameter space where a trilepton signal can be seen at TeV33. Finally, there
exist significant regions of parameter space where direct detection of bottom
squark pair production can be made, especially for large negative values of the
GUT parameter $A_0$.


title: Off-forward gluonometry

abstract:
  We explore the deeply virtual Compton scattering process at NLO with the
emphasis on the measurement of the tensor gluon skewed distributions. We
recalculate the one-loop coefficient function and give two-loop results for
anomalous dimensions and exclusive evolution kernels required for studying the
logarithmic scaling violation. We evaluate weighted cross sections which give
direct access to these functions on experiment.


title: Automatic Loop Calculations with FeynArts, FormCalc, and LoopTools

abstract:
  This article describes three Mathematica packages for the automatic
calculation of one-loop Feynman diagrams: the diagrams are generated with
FeynArts, algebraically simplified with FormCalc, and finally evaluated
numerically using the LoopTools package. The calculations are performed
analytically as far as possible, with results given in a form well suited for
numerical evaluation. The latter is straightforward with the utility programs
provided by FormCalc (e.g. for translation into Fortran code) and the
implementations of the one-loop integrals in LoopTools. The programs are also
equipped for calculations in supersymmetric models.


title: Neutrinos as Source of Ultra High Energy Cosmic Rays in Extra Dimensions

abstract:
  If the neutrinos are to be identified with the primary source of ultra-high
energy cosmic rays(UHECR), their interaction on relic neutrinos is of great
importance in understanding their long intergalactic journey. In theories with
large compact dimensions, the exchange of a tower of massive spin-2 gravitons
(Kaluza-Klein excitations) gives extra contribution to $\nu\bar{\nu}
\longrightarrow f\bar{f}$ and $\gamma\gamma$ processes along with the opening
of a new channel for the neutrinos to annihilate with the relic cosmic neutrino
background $\nu\bar{\nu} \longrightarrow G_{kk}$ to produce bulk gravitons in
the extra dimensions. This will affect their attenuation. We compute the
contribution of these Kaluza-Klein excitations to the above processes and find
that for parameters of the theory constrained by supernova cooling, the
contribution does indeed become the dominant contribution above $\sqrt{s}
\simeq 300$ GeV.


title: B-ball Dark Matter and Baryogenesis

abstract:
  It has been recently suggested that stable, supersymmetric B-balls formed in
the early universe could not only be the dark matter at the present epoch, but
also be responsible for baryogenesis by their partial evaporation at high
temperatures. We reinvestigate the efficiency of B-ball baryogenesis and find
it to be limited by the diffusion of baryon number away from the B-balls.
Successful baryogenesis may only occur for B-balls with charges Q\simle 10^{20}
- 5\times 10^{23}, which is close to the observational lower limits on the Q of
a significant B-ball dark matter component. We also present some cosmological
constraints on the abundances of larger B-balls in the early universe.


title: Higgs Model without Elementary Scalars

abstract:
  A model of interaction of massless vector and spinor fields is considered.
With the use of Bogolyubov quasi-average method we study a possibility of a
dynamical breaking of the initial symmetry. Assuming the existence of effective
cut-off $\Lambda$, we show, that there exists a solution, which breaks gauge
symmetry of the theory. Instead of Higgs scalars fermion-antifermion tachion
bound states are present here. As a result we have a theory with a massive
vector field, a massive spinor and a composite scalar.


title: On Realistic Brane Worlds from Type I Strings

abstract:
  We review recent progress in constructing realistic brane models from type I
string vacua. Explicit models with three families of the standard model gauge
group and its left-right generalizations are presented with supersymmetry
broken at the string scale of order $M_s\sim 10^{10-12}$ GeV, realizing gravity
mediated supersymmetry breaking at low energies. Unification of couplings
occurs at the string scale due to the particular U(1) normalizations of
D-branes, as well as to the existence of a Higgs field per family of quarks and
leptons. The proton is naturally stable due to intrinsic discrete symmetries of
the corresponding string theory. In particular R-parity appears as a natural
stringy symmetry. There are axionic fields with the right couplings as to solve
the strong CP problem. Similar realizations are also presented for a string
scale of 1 TeV, although without solving the gauge unification problem. Open
questions are briefly discussed.


title: Recent Results from (Full) Lattice QCD

abstract:
  An overview of the Lattice technique for studies of the strong interaction is
given. Recent results from the UKQCD lattice collaboration are presented. These
concentrate on spectral quantities calculated using full (i.e. unquenched) QCD.
A comparison with quenched results is made. Novel methods of extracting
spectral properties from two-point functions are described.


title: Combining QCD Matrix Elements and Parton Showers

abstract:
  A new method for combining QCD matrix elements and parton showers in Monte
Carlo simulations of hadronic final states is outlined. The aim is to provide
at least a leading-order description of all hard multi-jet configurations
together with jet fragmentation to next-to-leading logarithmic accuracy, while
avoiding the most serious problems of double counting.


title: Finite Temperature and Large Gauge Invariance

abstract: We discuss the problem of large gauge invariance at finite temperature.


title: Cosmological constant vs. quintessence

abstract:
  There is some evidence that the Universe is presently undergoing accelerating
expansion. This has restored some credit to the scenarios with a non-vanishing
cosmological constant. From the point of view of a theory of fundamental
interactions, one may argue that a dynamical component with negative pressure
is easier to achieve. As an illustration, the quintessence scenario is
described and its shortcomings are discussed in connection with the nagging
``cosmological constant problem''.


title:
Naturalness of the Coleman-Glashow Mass Relation in the 1/N_c Expansion:
  an Update

abstract:
  A new measurement of the Xi^0 mass verifies the accuracy of the
Coleman-Glashow relation at the level predicted by the 1/N_c expansion. Values
for other baryon isospin mass splittings are updated, and continue to agree
with the 1/N_c hierarchy.


title:
Duality in the non-relativistic harmonic oscillator quark model in the
  Shifman-Voloshin limit : a pedagogical example

abstract:
  The detailed way in which duality between sum of exclusive states and the
free quark model description operates in semileptonic total decay widths, is
analysed. It is made very explicit by the use of the non relativistic harmonic
oscillator quark model in the SV limit, and a simple interaction current with
the lepton pair. In particular, the Voloshin sum rule is found to eliminate the
mismatches of order $\delta m/m_b^2$.


title: Dispersion Relations in Ultradegenerate Relativistic Plasmas

abstract:
  The propagation of excitation modes in a relativistic ultradegenerate plasma
is modified by their interactions with the medium. These modifications can be
computed by evaluating their on-shell self-energy, which gives
(gauge-independent) dispersion relations. For modes with momentum close to the
Fermi momentum, the one-loop fermion self-energy is dominated by a diagram with
a soft photon in the loop. We find the one-loop dispersion relations for
quasiparticles and antiquasiparticles, which behave differently as a
consequence of their very different phase-space restrictions when they scatter
with the electrons of the Fermi sea. In a relativistic system, the unscreened
magnetic interactions spoil the normal Fermi liquid behavior of the plasma. For
small values of the Fermi velocity, we recover the non-relativistic dispersion
relations of condensed matter systems.


title:
A New Model-Independent Method for Extracting Spin-Dependent Cross
  Section Limits from Dark Matter Searches

abstract:
  A new method is proposed for extracting limits on spin-dependent WIMP-nucleon
interaction cross sections from direct detection dark matter experiments. The
new method has the advantage that the limits on individual WIMP-proton and
WIMP-neutron cross sections for a given WIMP mass can be combined in a simple
way to give a model-independent limit on the properties of WIMPs scattering
from both protons and neutrons in the target nucleus. Extension of the
technique to the case of a target material consisting of several different
species of nuclei is discussed.


title: The role of the input in Roy's equations for pion-pion scattering

abstract:
  The Roy equations determine the S- and P-wave pion-pion phase shifts on a low
energy interval. They allow the derivation of threshold parameters from
experimental data. We examine the solutions of these equations that are in the
neighborhood of a given solution by means of a linearization procedure. An
updated survey of known results on the dimension of the manifold of solutions
is presented. The solution is unique for a low energy interval with upper end
at 800 MeV. We determine its response to small variations of the input: S-wave
scattering lengths and absorptive parts above 800 MeV. We confirm the existence
of a universal curve of solutions in the plane of the S-wave scattering lengths
and provide a control of the decrease of the influence of the input absorptive
parts with increasing energy. A general result on the suppression of unphysical
singularities at the upper end of the low energy interval is established and
its practical implications are discussed.


title: Dynamical Symmetry Breaking in the Sea of the Nucleon

abstract:
  We derive the non-analytic chiral behavior of the flavor asymmetry dbar -
ubar. Such behavior is a unique characteristic of Goldstone boson loops in
chiral theories, including QCD, and establishes the unambiguous role played by
the Goldstone boson cloud in the sea of the proton. Generalizing the results to
the SU(3) sector, we show that strange chiral loops require that the s - sbar
distribution be non-zero.


title:
Multiple Scattering, Parton Energy Loss and Modified Fragmentation
  Functions in Deeply Inelastic eA Scattering

abstract:
  Modified quark fragmentation functions in deeply inelastic $eA$ collisions
and their QCD evolution equations are derived for the first time in the
framework of multiple parton scattering. Induced radiation gives rise to
additional terms in the evolution equations and thus softens the modified quark
fragmentation functions. The results in the next-leading-twist depend on both
diagonal and off-diagonal twist-four parton distributions and the combination
of which clearly manifests the LPM interference pattern. The predicted
modification depends quadratically on the nuclear size ($A^{2/3}$).
Generalization to the case of hot QCD medium is also discussed.


title: On nuclear matrix element uncertainties in short range 0vBB decay

abstract:
  The evaluation of short range contributions to neutrinoless double beta decay
has been challenged due to critics of the ansatz of the nuclear matrix element
calculations. We comment on the critics and uncertainties of these calculations
and the effect on the derived limits.


title:
The Boltzmann equation for colourless plasmons in hot QCD plasma.
  Semiclassical approximation

abstract:
  Within the framework of the semiclassical approximation, we derive the
Boltzmann equation describing the dynamics of colorless plasmons in a hot QCD
plasma. The probability of the plasmon-plasmon scattering at the leading order
in the coupling constant is obtained. This probability is gauge-independent at
least in the class of the covariant and temporal gauges. It is noted that the
structure of the scattering kernel possesses important qualitative difference
from the corresponding one in the Abelian plasma, in spite of the fact that we
focused our study on the colorless soft excitations. It is shown that
four-plasmon decay is suppressed by the power of $g$ relative to the process of
nonlinear scattering of plasmons by thermal particles at the soft momentum
scale. It is stated that the former process becomes important in going to the
ultrasoft region of the momentum scale.


title:
Thermal Equilibrium and Non-uniform Longitudinal Flow in Relativistic
  Heavy Ion Collisions

abstract:
  A model with non-uniform flow in the longitudinal direction is proposed for
the relativistic heavy-ion collisions and compared with the 14.6 A GeV/c Si-Al
and 10.8 A GeV/c Au-Au collision data. The stronger influence of transparency
on the distribution of heavier produced particles and the larger stopping in
the heavier collision system are accounted for by using a new geometrical
parameterization picture. The central dips in the proton and deuteron rapidity
distributions for Si-Al collision are reproduced.


title: Total Cross Sections with Virtual Photons

abstract:
  A model for total cross sections with virtual photons is presented, in
particular gamma-p and gamma-gamma cross sections are considered. Our approach
is based on an existing model for photoproduction, which subdivides the total
cross section into three distinct event classes: direct, VMD and anomalous. In
the region of large photon virtualities, the Deep Inelastic Scattering
processes (up to O(alpha_s) corrections) are obtained. Hence, the model
provides a smooth transition between the two regions. By the breakdown into
different event classes, a complete picture of all event properties is the
ultimate goal.


title:
A unitary model for structure functions and diffractive production at
  small x

abstract:
  We propose a unified approach which describes both structure functions in the
small-$x$ region and diffractive production in $\gamma^*p$-interactions. It is
shown that the model, based on reggeon calculus and a quark-parton picture of
the interaction, gives a good description of available experimental data in a
broad region of $Q^2$ (including $Q^2 =0$) with a single Pomeron of intercept
$\alpha_P(0) = 1.2$. Predictions for very small $x$ are given and the problem
of saturation of parton densities is discussed.


title: Detecting the MSSM Higgs Bosons at Future $e^+e^-$ Colliders

abstract:
  We investigate the possibility of detecting the Higgs bosons predicted in the
Minimal Supersymmetric extension of the Standard Model $(h^0, H^0, A^0,
H^\pm)$, with the reactions $e^{+}e^{-}\to b\bar b h^0 (H^0, A^0)$, and
$e^+e^-\to \tau^-\bar \nu_\tau H^+, \tau^+\nu_\tau H^-$, using the helicity
formalism. We analyze the region of parameter space $(m_{A^0}-\tan\beta)$ where
$h^0, H^0, A^0$ and $H^\pm$ could be detected in the limit when $\tan\beta$ is
large. The numerical computation is done considering two stages of a possible
Next Linear $e^{+}e^{-}$ Collider: the first with $\sqrt{s}=500$ $GeV$ and
design luminosity 50 $fb^{-1}$, and the second with $\sqrt{s}=1$ $TeV$ and
luminosity 100-200 $fb^{-1}$.


title: Resonant decay of parity odd bubbles in hot hadronic matter

abstract:
  We investigate the decay of metastable states with broken CP-symmetry which
have recently been proposed by Kharzeev, Pisarski and Tytgat to form in hot
hadronic matter. We consider the efficiency of the amplification of the
$\eta'$-field via parametric resonance, taking the backreaction into account.
For times of the order $t\approx 10 fm$, we find a particle density of about
$0.7/fm^3$ and a correlation length of $\xi_{max}\approx 2.5 fm$. The
corresponding momentum spectra show a non-thermal behaviour.


title: Peripheral Production of Sigmas in Proton Proton Collisions

abstract:
  The Pomeron, which dominates high energy elastic and diffractive hadronic
processes, must be largely gluonic in nature. We use a recent picture of a
scalar glueball/sigma system with coupling of the sigma to glue determined from
experiment to predict strong peripheral sigma production seen in the p p
$\pi^o\pi^o$ final state.


title: Constraints on Vacuum Oscillations from Recent Solar Neutrino Data

abstract:
  A detailed study of the solar neutrino vacuum oscillation was made taking
into account three neutrino flavours and the seasonal effect. This analysis was
established for a range of the mixing parameter sin^2(2\phi), that is concerned
with the electron-tau neutrino oscillations, from 0 to 1. We obtained the
allowed mass regions versus mixing angles by fitting only the rates of the five
solar neutrino detectors in activity and we compared with the fits including
the recoil-electron spectrum of the Kamiokande and Super-Kamiokande
experiments. The averaged survival probabilities for electron neutrinos as a
function of the neutrino energy are also obtained, showing that the solutions
for sin^2(2\phi) greater than 0.50 with the maximum exclusion of Be7 neutrinos
and the minimum exclusion of pp neutrinos give a better explanation for the
suppression rates of all detectors.


title: Nuclear Effects on the Extraction of Neutron Structure Functions

abstract:
  Nuclear effects in light nuclei due to the presence of spin-one isosinglet
6-quark clusters are investigated. The quark distributions of 6-quark clusters
are obtained by using a perturbative QCD (pQCD) based framework, which allows
us to get a good description of the ratio of the deuteron structure function to
the free nucleon structure function. Nuclear effects on the extraction of the
neutron structure functions $F_2^n$ and $g_1^n$ are estimated. We find that the
effect on the extracted spin-dependent neutron structure function is very
different from that on the spin-independent neutron structure function. The
effect enhances the Bjorken sum by about 10%, whereas its correction to the
Gottfried sum is rather small. The formalism for calculating nuclear effects is
further used to evaluate the spin-dependent structure function of the $^3$He
nucleus and a good self-consistent check is obtained.


title: A Note on Large Extra Dimensions

abstract:
  We study corrections to the photon-propagator in a recently proposed model,
where gravity lives in 4+n dimensions and Standard Model fields in 4
dimensions. We find a correction to the form factor of the photon that can be
constrained by QED tests.


title: Decays of the $B_{c}$ Meson in a Relativistic Quark-Meson Model

abstract:
  The semileptonic decay form factors of the double heavy $B_{c}$ meson provide
a unique opportunity to study the strong interactions between two heavy quarks.
A fully relativistic model, with effective non-local quark-meson interactions,
is used to compute semileptonic decay form factors, for both the $B_{c}$ and a
wide range of other heavy-light mesons. Using these form factors predictions
for decay rates and branching ratios are obtained. The results are compared to
other theoretical approaches and, where available, to experimental results. In
addition the radiative decay of $B^*_{c}$ is discussed.


title: Recent results on Charm Physics from Fermilab

abstract:
  New high statistics, high resolution fixed target experiments producing
$10^5$ - $10^6$ fully reconstructed charm particles are allowing a detailed
study of the charm sector. Recent results on charm quark production from
Fermilab fixed target experiments E791, SELEX and FOCUS are presented.


title: Polarization of vacuum in the decays of neutral kaons

abstract:
  It is considered the state of $K^0$ before the decay as that embedded into
the vacuum of $+ \bar K^0 - \bar K^0$. Since the state of $K^0_S$ has the
lifeitme $\tau_S$, and the state of $K^0_L$ has the lifeitme $\tau_L$, the
vacuum of $+ \bar K^0 - \bar K^0$ is polarized. Due to the polarization of the
vacuum, $2\tau_S/\tau_L$ of $K^0_S$ decay with the delay $\approx \tau_L$. Thus
CP-invariance holds true in the decays of neutral kaons.


title: $\omega-\rho$ Mixing and the $\omega\to\pi\pi\gamma$ Decay

abstract:
  We reexamine the $\omega \to \pi^{0} \pi^{0} \gamma $ decay, adding the
effect of $\omega-\rho$ mixing to the amplitude calculated with the aid of
chiral perturbation theory and vector meson dominance. We predict the neutral
decay to occur with a width of $\Gamma($\omega \to \pi^{0} \pi^{0} \gamma $)
=(390\pm96) {\rm eV}$ and also analyze the effect of the $\omega-\rho$ mixing
on the $\Gamma($\omega \to \pi^{0} \pi^{0} \gamma $)/ \Gamma($\omega \to
\pi^{+} \pi^{-} \gamma $)$ ratio. Several remarks on the effect of
$\omega-\rho$ mixing on certain radiative decays of vector mesons are
presented.


title: Gauge-Independent W-Boson Partial Decay Widths

abstract:
  We calculate the partial decay widths of the W boson at one loop in the
standard model using the on-shell renormalization scheme endowed with a
gauge-independent definition of the Cabibbo-Kobayashi-Maskawa (CKM) mixing
matrix. We work in $R_\xi$ gauge and explicitly verify that the final
expressions are independent of the gauge parameters. Furthermore, we establish
the relationship between the on-shell and $\bar{\mathrm{MS}}$ definitions of
the CKM matrix, both in its generic form and in the Wolfenstein
parameterization. As a by-product of our analysis, we recover the beta function
of the CKM matrix.


title: Supersymmetry for Flavors

abstract:
  An understanding of the lepton masses within the framework of SUSY is
presented. A family symmetry is introduced. Sneutrino VEV breaks this symmetry.
The tau mass is due to the Higgs VEV, and muon mass purely from the sneutrino
VEV. A viable model is constructed, which predicts (1-10) MeV tau-neutrino.


title: Parton Distributions in Nuclei at Small x

abstract:
  We study the nuclear shadowing effect in the context of Glauber-Gribov
multiple-scattering model and perturbative QCD. We find that at small x, the
$Q^2$ evolution of the shadowing is much slower than the DGLAP evolution, due
to the multiple scatterings at small x. We show that the gluon shadowing at
small x and for $Q^2 > 3GeV^2$ is perturbative in nature and does not depend on
the initial, non-perturbative condition. We evaluate the impact parameter
dependence of the gluon distribution and show that it is a non-linear effect in
the nuclear thickness function.


title:
Non-unitarity of CKM matrix from the vector singlet quark mixing and
  neutron electric dipole moment

abstract:
  In the standard model (SM) the lowest order contribution to the quark
electric dipole moment (EDM) occurs at the three loop level. We show that the
non-unitarity of the CKM matrix in models with an extended quark sector
typically gives rise to a quark EDM at the two loop level which has no GIM-like
suppression factors except the external quark mass. The induced neutron EDM is
of order 10^{-29} e cm and can be well within the reach of the next generation
of experiments if it is further enhanced by long distance physics as happens in
the SM.


title:
Are lepton flavor mixings in the democratic mass matrix stable against
  quantum corrections?

abstract:
  We investigate whether the lepton flavor mixing angles in the so-called
democratic type of mass matrix are stable against quantum corrections or not in
the minimal supersymmetric standard model with dimension five operator which
induces neutrino mass matrix. By taking simple breaking patterns of $S_3{}_L
\times S_3{}_R$ or $O(3)_L \times O(3)_R$ flavor symmetries and the scale where
democratic textures are induced as $O(10^{13})$ GeV, we find that the stability
of the lepton flavor mixing angles in the democratic type of mass matrix
against quantum corrections depends on the solar neutrino solutions. The
maximal flavor mixing of the vacuum oscillation solution is spoiled by the
quantum corrections in the experimental allowed region of $\tan \beta$. The
large angle MSW solution is spoiled by the quantum corrections in the region of
$\tan \beta > 10$. The condition of $\tan \beta \leq 10$ is needed in order to
obtain the suitable mass squared difference of the small angle MSW solution.
These strong constraints must be regarded for the model building of the
democratic type of mass matrix


title:
A calculation of the transport coefficients of hot and dense hadronic
  matter based on the event generator URASiMA

abstract:
  We evaluate thermodynamical quantities and the transport coefficients of a
dense and hot hadronic matter based on the event generator URASiMA
(Ultra-Relativistic AA collision Simulator based on Multiple Scattering
Algorithm) with periodic boundary conditions. As the simplest example of the
transport coefficients we investigate the temperature dependence and the
chemical potential dependence of the baryon diffusion constant of a dense and
hot hadronic matter.


title: Light Fermion Finite Mass Effects in Non-relativistic Bound States

abstract:
  We present analytic expressions for the vacuum polarization effects due to a
light fermion with finite mass in the binding energy and in the wave function
at the origin of QED and (weak coupling) QCD non-relativistic bound states.
Applications to exotic atoms, \Upsilon (1s) and t\bar{t} production near
threshold are briefly discussed.


title: Quark Coalescence and Hadronic Equilibrium

abstract:
  In a simplified model we study how close can the result of a fast,
non-equilibrium hadronization of quark matter in an expanding fireball come to
hadronic composition in equilibrium. We present a chemical approach to the
simple A+B --> C quark fusion, showing ideal equilibrium constrained by
conservation laws, the fugacity parametrization, as well as linear and
non-linear quark coalescence models as different approximations to this
chemistry. It is shown that color confinement requires a quark density
dependent hadronization cross section.


title: Can LSND be included in a 3-Neutrino framework?

abstract:
  We study the special features emerging from a three lepton generation
analysis of the available neutrino oscillation data (solar, atmospheric and
LSND). First we find that it is possible to explain all three sets of data in
terms of the standard left handed neutrinos without the need of sterile
neutrinos. Second we find a significant difference in the mass matrix extracted
from the data, depending on the analysis (without or with LSND), if the mass of
the lightest neutrino, which cannot be determined from the neutrino oscillation
data alone, is relatively small, i.e $\leq$0.1 eV. To compare with other
processes we used the R-parity violating Minimal Supersymmetric Standard Model
(\rp-MSSM) for the theoretical description of the neutrino masses. Using the
oscillation data we were able to constrain the parameters of the model. In
particular we were able to obtain values for the coupling constants of the
\rp-MSSM.


title:
Extracting and using photon polarization information in radiative B
  decays

abstract:
  We discuss the uses of conversion electron pairs for extracting photon
polarization information in weak radiative B decays. Both cases of leptons
produced through a virtual and real photon are considered. Measurements of the
angular correlation between the $(K\pi)$ and $(e^+e^-)$ decay planes in $B\to
K^*(\to K\pi)\gamma^{(*)}(\to e^+e^-)$ decays can be used to determine the
helicity amplitudes in the radiative $B\to K^*\gamma$ decay. A large
right-handed helicity amplitude in $\bar B$ decays is a signal of new physics.
The time-dependent CP asymmetry in the $B^0$ decay angular correlation is shown
to measure $\sin 2\beta$ and $\cos 2\beta$ with little hadronic uncertainty.


title:
MSW effect with flavor changing interactions and the atmospheric
  neutrino problem

abstract:
  We consider flavor changing effective neutrino interactions in the context of
massive neutrinos in the issue of atmospheric neutrinos. Assuming as usual that
this is an indication of the oscillation of muon neutrinos into tau neutrinos
we show that there is a set of parameters which is consistent with the MSW
resonance condition for the typical Earth density and atmospheric neutrino
energies. In particular we show that even if the vacuum mixing angle vanishes
it is still possible to have a resonance which is compatible with the
atmospheric neutrino data. We also briefly consider the case of the solar
neutrino problem.


title:
Shadowing of gluons in perturbative QCD: A comparison of different
  models

abstract:
  We investigate the different perturbative QCD-based models for nuclear
shadowing of gluons. We show that in the kinematic region appropriate to RHIC
experiment, all models give similar estimates for the magnitude of gluon
shadowing. At scales relevant to LHC, there is a sizable difference between
predictions of the different models.


title: New Mechanism for Mass Generation of Gauge Fields

abstract:
  A new mechanism for mass generation of gauge fields is proposed in this
paper. By introducing two sets of gauge fields and making the variatons of
these two sets of gauge fields compensate each other under local gauge
transformations, the mass term of gauge fields can be introduced into the
Lagrangian without violation the local gauge symmetry of the Lagrangian.
Besides, this model is renormalizable.


title: Topological Inflation in Supergravity

abstract:
  We investigate a topological inflation model in supergravity. By means of
numerical simulations, it is confirmed that topological inflation can take
place in supergravity. We also show that the condition for successful inflation
depends not only on the vacuum-expectation value (VEV) of inflaton field but
also on the form of its K\"ahler potential. In fact, it is found that the
required VEV of the inflaton $\phi$ can be as small as $<\phi > \simeq 1 \times
M_G$, where $M_{G}$ is the gravitational scale.


title: Precise predictions for W-pair production at LEP2 with RACOONWW

abstract:
  RACOONWW is the first Monte Carlo generator for e+e- --> WW --> 4f(+gamma)
that includes the electroweak O(alpha) radiative corrections in the double-pole
approximation completely. Some numerical results for LEP2 energies are
discussed, and the predictions for the total W-pair cross section are
confronted with LEP2 data.


title: The effects of Majorana phases in three-generation neutrinos

abstract:
  Neutrino-oscillation solutions for the atmospheric neutrino anomaly and the
solar neutrino deficit can determine the texture of the neutrino mass matrix
according to three types of neutrino mass hierarchies as Type A: $m_1^{} \ll
m_2^{} \ll m_3^{}$,
  Type B: $m_1^{} \sim m_2^{} \gg m_3^{}$, and Type C: $m_1^{} \sim m_2^{} \sim
m_3^{}$, where $m_i$ is the $i$-th generation neutrino absolute mass. The
relative sign assignments of neutrino masses in each type of mass hierarchies
play the crucial roles for the stability against quantum corrections. Actually,
two physical Majorana phases in the lepton flavor mixing matrix connect among
the relative sign assignments of neutrino masses. Therefore, in this paper we
analyze the stability of mixing angles against quantum corrections according to
three types of neutrino mass hierarchies (Type A, B, C) and two Majorana
phases. Two phases play the crucial roles for the stability of the mixing
angles against the quantum corrections.


title: Signatures of massive sgoldstinos at hadron colliders

abstract:
  In supersymmetric extensions of the Standard Model with a very light
gravitino, the effective theory at the weak scale should contain not only the
goldstino, but also its supersymmetric partners, the sgoldstinos. In the
simplest case, the goldstino is a gauge-singlet and its superpartners are two
neutral spin-0 particles, S and P. We study possible signals of massive
sgoldstinos at hadron colliders, focusing on those that are most relevant for
the Tevatron. We show that inclusive production of sgoldstinos, followed by
their decay into two photons, can lead to observable signals or to stringent
combined bounds on the gravitino and sgoldstino masses. Sgoldstino decays into
two gluon jets may provide a useful complementary signature.


title: Masses of Heavy Hadrons

abstract:
  An estimate has been made of the masses of heavy hadrons in nonrelativistic
quark model, which includes spin and flavor-dependent hyperfine splitting for
two quarks. The effect of variation of the wavefunction value at origin and the
strong coupling constant, with flavor, has also been included in calculating
the mass values.


title: The double parton distributions in the hard pomeron model

abstract:
  We study the double parton interaction process in collisions between highly
virtual $q{\bar q}$ pairs in the BFKL regime. Explicit expressions for the
double parton distributions are obtained both in the case of direct coupling of
the BFKL pomerons to the $q{\bar q}$ pair and in the case of triple pomeron
interaction.


title: Unitarity Constraints on Neutrino Mass and Mixings

abstract:
  We explore the implications of imposing the constraint that two neutrino
flavors (which for definiteness we take to be muon and tau neutrinos) are
similarly coupled to the mass basis in addition to the unitarity constraints.
Implications of this scheme for specific experimental situations are discussed.


title: Neutrino masses in the R-parity violating MSSM

abstract:
  We compute one loop neutrino masses in the R-parity violating Minimal
Supersymmetric Model, including the bilinear R-parity violating masses in the
mass insertion approximation. To the order we calculate, our results are
independent of the Higgs-lepton basis choice. We have a variety of perturbative
parameters-gauge, yukawa and trilinear couplings, and R_p violating masses.
Their relative magnitudes determine which diagrams are relevant for neutrino
mass calculations. We find new loop diagrams which can be relevant and have
frequently been neglected in the past. For the Grossman-Haber neutral loop
contribution to the neutrino mass matrix we obtain explicit analytic results.


title:
Phenomenology of transverse single spin asymmetries in inclusive
  processes

abstract:
  A phenomenological description of single transverse spin asymmetries for the
inclusive production of hadrons in proton-proton and lepton-proton processes is
discussed within pQCD and a straightforward generalization of the factorization
theorem with the inclusion of parton intrinsic transverse motion. Fits to
existing data, predictions for new processes and interpretation of recent
results are presented.


title: Prospects of Squark & Slepton searches at a Gamma Gamma Collider

abstract:
  We examine the prospects of detecting sfermions at a gamma gamma collider.
Once produced, a slepton can decay into a pair of quarks (jets) through
R-parity violating interactions. Similarly, a squark may decay into a
lepton-quark pair. Analyzing the corresponding Standard Model backgrounds,
namely 4-jet and dilepton plus dijet final states respectively, we show that
the sfermion can be detected almost right upto the kinematic limit and its mass
determined to a fair degree of accuracy. Similar statements also hold for
nonsupersymmetric leptoquarks and diquarks.


title: Nonperturbative Renormalization and the QCD Vacuum

abstract:
  We present a self consistent approach to Coulomb gauge Hamiltonian QCD which
allows one to relate single gluon spectral properties to the long range
behavior of the confining interaction. Nonperturbative renormalization is
discussed. The numerical results are in good agreement with phenomenological
and lattice forms of the static potential.


title: Global Fits to Electroweak Data Using GAPP

abstract:
  At Run II of the Tevatron it will be possible to measure the W boson mass
with a relative precision of about 2 times 10^-4, which will eventually
represent the best measured observable beyond the input parameters of the SM.
Proper interpretation of such an ultrahigh precision measurement, either within
the SM or beyond, requires the meticulous implementation and control of higher
order radiative corrections. The FORTRAN package GAPP, described here, is
specifically designed to meet this need and to ensure the highest possible
degrees of accuracy, reliability, adaptability, and efficiency.