title:
Single Spin Asymmetries in Semi-Inclusive Electroproduction: Access to
  Transversity

abstract:
  We discuss the quark transversity distribution function and a possible way to
access it through the measurement of single spin azimuthal asymmetry in
semi-inclusive single pion electroproduction on a transversely polarized
target.


title:
Evolution of the Yukawa coupling constants and seesaw operators in the
  universal seesaw model

abstract:
  The general features of the evolution of the Yukawa coupling constants and
seesaw operators in the universal seesaw model with det M_F=0 are investigated.
Especially, it is checked whether the model causes bursts of Yukawa coupling
constants, because in the model not only the magnitude of the Yukawa coupling
constant (Y_L^u)_{33} in the up-quark sector but also that of (Y_L^d)_{33} in
the down-quark sector is of the order of one, i.e., (Y_L^u)_{33} \sim
(Y_L^d)_{33} \sim 1. The requirement that the model should be calculable
perturbatively puts some constraints on the values of the intermediate mass
scales and tan\beta (in the SUSY model).


title: Isgur--Wise function in a relativistic model of constituent quarks

abstract:
  The integral representation for Isgur -- Wise function (IWF) is obtained in
the framework of instant--form relativistic Hamiltonian dynamics for mesons
with one heavy quark. The upper and lower limits are calculated for the slope
parameter of IWF $\rho^2$ by the model independent way. IWF is calculated for
different wave functions of quarks in the meson. The difference between the
limits of $\rho^2$ equals 1/3. The constraint on the slope parameter is in a
good agreement with experiments. The weak dependence of IWF on the choice of
wave functions is found.


title: Proper construction of the continuum in light-cone QCD sum rules

abstract:
  A proper way of subtracting the continuum contributions in light-cone QCD sum
rules (LCQSR) is demonstrated. Specifically, we calculate the continuum
corresponding to a typical OPE appearing in LCQSR by properly combining the
double dispersion relation with QCD duality. We demonstrate how the subtraction
terms can spuriously contribute to the sum rules. In the limit of zero external
momentum, taking out the spurious continuum is found to yield the sum rules
using the single-variable dispersion relation. The continuum factor constructed
in this way differs from the one appearing in usual LCQSR. The difference
substantially affects the extraction of hadronic parameters from the
correlation function involving baryon currents.


title: Electrogenesis in a scalar field dominated epoch

abstract:
  In this talk I discuss models in which a homogeneous scalar field is used to
modify standard cosmology above the nucleosynthesis scale to provide an
explanation for the observed matter-antimatter asymmetry of the Universe.


title: Quantum Mechanics of Neutrino Oscillations

abstract:
  We present a simple but general treatment of neutrino oscillations in the
framework of quantum mechanics using plane waves and intuitive wave packet
principles when necessary. We attempt to clarify some confusing statements that
have recently appeared in the literature.


title:
Longitudinal, transverse-plus and transverse-minus W-bosons in
  unpolarized top quark decays at O(alpha_s)

abstract:
  We consider the O(alpha_s) radiative corrections to the decay of an
unpolarized top quark into a bottom quark and a W-gauge boson where the
helicities of the W are specified as longitudinal, transverse-plus and
transverse-minus. The O(alpha_s) radiative corrections lower the normalized
longitudinal rate Gamma_L/Gamma by 1.06% and increase the the normalized
transverse-minus rate Gamma_-/Gamma by 2.17%. We find that the normalized
transverse-plus rate Gamma_+/Gamma, which vanishes at the Born term level for
m_b->0, receives radiative correction contributions at the sub-percent level.
We discuss m_b!=0 effects for the Born term and the alpha_s-contributions but
find these to be small. Our results are discussed in the light of recent
measurements of the helicity content of the W in top quark decays by the CDF
Collaboration.


title: Instantons and color symmetry breaking in the vacuum

abstract:
  The instanton interaction in QCD generates an effective potential for scalar
quark-antiquark condensates in the color singlet and octet channels. For three
light quark flavors the cubic term in this potential induces an octet
condensate and ``spontaneous breaking'' of color in the vacuum. Realistic
masses of the rho- and eta'-mesons are compatible with
renormalization-group-improved instanton perturbation theory.


title: t-channel production of heavy charged leptons

abstract:
  We study the pair production of heavy charged exotic leptons at e+ e-
colliders in the SU(2)_L x SU(2)_I x U(1)_Y model. This gauge group is a
subgroup of the grand unification group E6; SU(2)_I commutes with the electric
charge operator, and the three corresponding gauge bosons are electrically
neutral. In addition to the standard photon and Z boson contributions, we also
include the contributions from extra neutral gauge bosons. A t-channel
contribution due to W_I-boson exchange, which is unsuppressed by mixing angles,
is quite important. We calculate the left-right and forward-backward
asymmetries, and discuss how to differentiate different models.


title: The Standard Electroweak Theory and Beyond

abstract:
  1. Introduction, 2. Gauge Theories, 3. The Standard Model of Electroweak
Interactions, 4. The Higgs Mechanism, 5. The CKM Matrix, 6. Renormalisation and
Higher Order Corrections, 7. Why we do Believe in the Standard Model: Precision
Tests, 7.1.Precision Electroweak Data and the Standard Model, 7.2.A More
General Analysis of Electroweak Data, 8. Why we do not Believe in the Standard
Model, 8.1.Conceptual Problems, 8.2.Hints from Experiment, -8.2.1 Unification
of Couplings, -8.2.2 Dark Matter, -8.2.3 Neutrino Masses, -8.2.4 Baryogenesis,
9. Status of the Search for the Higgs and for New Physics, 10.Conclusion


title: Lorentz Invariant Baryon CHPT

abstract:
  Using the example of the elastic $\pi N$-amplitude, we discuss the low energy
expansion of QCD amplitudes in the sector with baryon number one. We show that
the chiral expansion of these amplitudes breaks down in certain regions of
phase space and present a framework which leads to a coherent description
throughout the low energy region, while keeping Lorentz and chiral invariance
manifest at every stage of the calculation. We explain how to construct a
representation of the pion nucleon scattering amplitude in terms of functions
of a single variable, which is valid to $O(q^4)$ and properly accounts for the
$\pi\pi$- and $\pi N$-cuts required by unitarity.


title:
Electroweak Radiative Corrections to W and Z Boson Production at Hadron
  Colliders

abstract:
  For the envisioned high precision measurement of the W boson mass at the
Tevatron and LHC it is crucial that the theoretical predictions for the W and Z
production processes are under control. We briefly summarize the status of the
electroweak radiative corrections to p p(pbar) -> W -> l nu and p p(pbar) ->
Z,gamma -> l+ l- (l=e,mu), and present some numerical results.


title:
One Loop Soft Supersymmetry Breaking Terms in Superstring Effective
  Theories

abstract:
  We perform a systematic analysis of soft supersymmetry breaking terms at the
one loop level in a large class of string effective field theories. This
includes the so-called anomaly mediated contributions. We illustrate our
results for several classes of orbifold models. In particular, we discuss a
class of models where soft supersymmetry breaking terms are determined by quasi
model independent anomaly mediated contributions, with possibly non-vanishing
scalar masses at the one loop level. We show that the latter contribution
depends on the detailed prescription of the regularization process which is
assumed to represent the Planck scale physics of the underlying fundamental
theory. The usual anomaly mediation case with vanishing scalar masses at one
loop is not found to be generic. However gaugino masses and A-terms always
vanish at tree level if supersymmetry breaking is moduli dominated with the
moduli stabilized at self-dual points, whereas the vanishing of the B-term
depends on the origin of the mu-term in the underlying theory. We also discuss
the supersymmetric spectrum of O-I and O-II models, as well as a model of
gaugino condensation. For reference, explicit spectra corresponding to a Higgs
mass of 114 GeV are given. Finally, we address general strategies for
distinguishing among these models.


title: Nucleon scattering with higgsino and wino cold dark matter

abstract:
  Neutralinos that are mostly wino or higgsino are shown to be compatible with
the recent DAMA annual modulation signal. The nucleon scattering rates for
these dark matter candidates are typically an order of magnitude above the
oft-considered bino. Although thermal evolution of higgsino and wino number
densities in the early universe implies that they are not viable dark matter
candidates, non-thermal sources, such as from gravitino or moduli decay in
anomaly mediated supersymmetry breaking, suggest that they can be the dominant
source of cold dark matter. Their stealthiness at high energy colliders gives
even more impetus to analyze nucleon scattering detection methods. We also
present calculations for their predicted scattering rate with Germanium
detectors, which have yet to see evidence of WIMP scattering.


title:
Survey of present data on photon structure functions and resolved photon
  processes

abstract:
  Present data on the partonic content of the photon from LEP, TRISTAN and HERA
accelerators are reviewed and the essential aspects of the underlying ideas and
methods are pointed out. Results of the unpolarized photon structure function
F_2 from DIS_{e gamma} experiments and on large p_T jet production processes in
the resolved gamma-gamma collisions are presented for both real and virtual
photons. The results of analysis of the hadronic final state accompanying the
DIS_{e gamma} measurements, showing some discrepancies with the Monte Carlo
models, are collected together and presented as a separate issue. Also results
on the DIS_{e gamma} with leptonic final states are shown. The results from
resolved real and virtual photon processes at HERA collider based on the single
and double jet events, also charged particles and prompt photons, are
presented. In the context of virtual photon processes the data for forward jet
and forward particle production are included. In addition a short presentation
of the recent data on the heavy quark content of the photon is given. Related
topics - the polarized (spin dependent) structure functions for the real and
virtual photon, the structure function of the electron and the photonic content
of the proton are also shortly mentioned.


title: Chiral Perturbation Theory, Non-leptonic Kaon Decays, and the Lattice

abstract:
  In this talk, I first motivate the use of Chiral Perturbation Theory in the
context of Lattice QCD. In particular, I explain how partially quenched QCD,
which has, in general, unequal valence- and sea-quark masses, can be used to
obtain real-world (i.e. unquenched) results for low-energy constants. In the
second part, I review how Chiral Perturbation Theory may be used to overcome
theoretical difficulties which afflict the computation of non-leptonic kaon
decay rates from Lattice QCD. I argue that it should be possible to determine
at least the O(p^2) weak low-energy constants reliably from numerical
computations of the K to pi and K to vacuum matrix elements of the
corresponding weak operators.


title:
Logarithmically rising hh and $\gamma h$ cross-sections: some features
  of model versus experimental data

abstract:
  A Regge model of the Pomeron with intercept equal to one, leading to rising
cross-sections is considered. Analysis of the experimental data on hadron and
photon induced interactions is performed within the model. It is shown that the
available pure hadronic data as well as data on DIS are compatible with a high
energy logarithmic behaviour of cross-sections and do not require a Pomeron
intercept above one. The very important r\^ole of the preasymptotic
contributions is especially emphasized.


title:
Standard Model Matrix Elements for Neutral B-Meson Mixing and Associated
  Decay Constants

abstract:
  We present results of quenched lattice calculations of the matrix elements
relevant for B_d-\bar B_d and B_s-\bar B_s mixing in the Standard Model.
Results for the corresponding SU(3)-breaking ratios, which can be used to
constrain or determine |V_{td}|, are also given. The calculations are performed
at two values of the lattice spacing, corresponding to \beta = 6.0 and \beta =
6.2, with quarks described by a mean-field-improved Sheikholeslami-Wohlert
action. As a by-product, we obtain the leptonic decay constants of B and D
mesons. We also present matrix elements relevant for D^0-\bar D^0 mixing. Our
results are summarized in the Introduction.


title: On the color simple group from chiral electroweak gauge groups

abstract:
  Following the pioneering Okubo scrutiny of gauge simple groups for the
quantum chromodynamics we show the constraints coming from the wondrous
predictive leptoquark-bilepton flavordynamics connecting the number of color
charges to solution of the flavor question and to an electric charge
quantization unconstrained from the Dirac, Majorana or Dirac--Majorana
character of massive neutrino.


title:
Single particle strength restoration and nuclear transparency in high
  Q^2 exclusive (e,e'p) reactions

abstract:
  Quenching of the single particle strength which previously precluded
unambiguous measurement of nuclear transparency in quasifree (e,e'p) reactions
at high momentum transfer is evaluated from the cross sections of measured
processes. We have demonstrated evidence of the single particle strength
restoration with increase of the momentum transfer in exclusive (e,e'p)
reactions and argue that in practically interesting cases of study the nuclear
transparency in these processes quenching is weakly depends on the probability
of short range nucleon correlations. It is shown that use of Glauber
approximation well describes NE18 and E94-139 (e,e'p) data at the momentum
transfers 1 GeV^2 < Q^2 < 3 GeV^2. This gives a further support to our
observation that the quenching of nuclear levels strongly depends on the
resolution (Q^2)and practically disappears at Q^2>1GeV^2.


title: Search for new physics via CP violation in $B_{d,s} \to l^+ l^-

abstract:
  It is shown that in the approximation of $|\frac{q}{p}|$=1 the CP violation
in $B^0_{d,s} \to l^+ l^-$ decays vanishes in SM. In a 2HDM with CP violating
phases and MSSM the CP asymmetries depend on the parameters of models and can
be as large as 40% for $B^0_d$ and 3% for $B^0_s$. An observation of CP
asymmetry in the decays would unambiguously signal the existence of new
physics.


title:
The Dispersive Approach to Electroweak Processes in the Background
  Magnetic Field

abstract:
  We propose a new method to compute amplitudes of electroweak processes in the
strong background magnetic field, using $\gamma\to e^+e^-$ as an example. We
show that the {\it moments} of $\gamma\to e^+e^-$ width are proportional to the
derivatives of photon polarization function at the zero energy. Hence, the
pair-production width can be easily calculated from the latter by the inverse
Mellin transform. The prospects of our approach are commented.


title:
Loop Induced Flavor Changing Neutral Decays of the Top Quark in a
  General Two-Higgs-Doublet Model

abstract:
  Decays of the top quark induced by flavor changing neutral currents (FCNC)
are known to be extremely rare events within the Standard Model. This is so not
only for the decay modes into gauge bosons, but most notably in the case of the
Higgs channels, e.g. t-> H_{SM}+c, with a branching fraction of 10^{-13} at
most. Therefore, detection of FCNC top quark decays in a future high-energy,
and high-luminosity, machine like the LHC or the LC would be an indisputable
signal of new physics. In this paper we show that within the simplest extension
of the SM, namely the general two-Higgs-doublet model, the FCNC top quark
decays into Higgs bosons, t->(h^{0},H^{0},A^{0})+c, can be the most favored
FCNC modes -- comparable or even more efficient than the gluon channel t-> g+c.
In both cases the optimal results are obtained for Type II models. However,
only the Higgs channels can have rates reaching the detectable level (10^{-5}),
with a maximum of order 10^{-4} which is compatible with the charged Higgs
bounds from radiative B-meson decays. We compare with the previous results
obtained in the Higgs sector of the MSSM.


title:
Radiative Corrections to Chargino Production in Electron-Positron
  Collisions

abstract:
  The results of a complete one-loop calculation for the production of chargino
pairs in electron-positron collisions, including the option of polarized beams,
are presented. The calculation has been performed in the on-shell
renormalization scheme. Applications to the integrated cross section, to the
forward-backward asymmetry for unpolarized beams, and to the left-right
asymmetry show that the higher-order effects have a sizeable influence on the
theoretical predictions and therefore should be properly taken into account for
detailed studies in the MSSM.


title: The decay b -> s g at NLL in the Standard Model

abstract:
  I present the Standard Model calculation of the decay rate for b -> s g (g
denotes a gluon) at next-to-leading logarithms (NLL). In order to get a
meaningful physical result, the decay b -> s g g and certain contributions of b
-> s \bar{f} f (where f are the light quark flavours u, d and s) have to be
included as well. Numerically we get BR^(NLL) = (5.0 +/- 1.0) * 10^{-3} which
is more than a factor 2 larger than the leading logarithmic result BR^(LL) =
(2.2 +/- 0.8) * 10^{-3}. Further, I consider the impact of this contribution on
the charmless hadronic branching ratio BRc, which could be used to extract the
CKM-ratio |V_(ub)/V_(cb)| with more accuracy. Finally, I have a short look at
BRc in scenarios where the Wilson coefficient C_8 is enhanced by new physics.


title: Two-loop QCD corrections to massless identical quark scattering

abstract:
  We present the two-loop virtual QCD corrections to the scattering of massless
identical quarks, q qbar to q qbar, in conventional dimensional regularisation
and using the MSbar scheme. The structure of the infrared divergences agrees
with that predicted by Catani while expressions for the finite remainder are
given for the q qbar to qbar q and the q q to q q (qbar qbar to qbar qbar)
scattering processes in terms of polylogarithms. The results presented here
form a vital part of the next-to-next-to-leading order contribution to
inclusive jet production in hadron colliders and will play a crucial role in
improving the theoretical prediction for jet cross sections in hadron-hadron
collisions.


title: Three fermionic generations on a topological defect in extra dimensions

abstract:
  We suggest a mechanism explaining the origin of three generations of the
Standard Model fermions from one generation in a higher-dimensional theory.
Four-dimensional fermions appear as zero modes trapped in the core of a
topological defect with topological number three. We discuss hierarchical
pattern of masses and mixings which arises in these models.


title: Pion and Kaon Vector Form Factors

abstract:
  We develop a unitarity approach to consider the final state interaction
corrections to the tree level graphs calculated from Chiral Perturbation Theory
($\chi PT$) allowing the inclusion of explicit resonance fields. The method is
discussed considering the coupled channel pion and kaon vector form factors.
These form factors are then matched with the one loop $\chi PT$ results. A very
good description of experimental data is accomplished for the vector form
factors and for the $\pi\pi$ P-wave phase shifts up to $\sqrt{s}\lesssim 1.2$
GeV, beyond which multiparticle states play a non negligible role. In
particular the low and resonance energy regions are discussed in detail and for
the former a comparison with one and two loop $\chi PT$ is made showing a
remarkable coincidence with the two loop $\chi PT$ results.


title: Extensive air showers with TeV-scale quantum gravity

abstract:
  One of the possible consequences of the existence of extra degrees of freedom
beyond the electroweak scale is the increase of neutrino-nucleon cross sections
($\sigma_{\nu N}$) beyond Standard Model predictions. At ultra-high energies
this may allow the existence of neutrino-initiated extensive air showers. In
this paper, we examine the most relevant observables of such showers. Our
analysis indicates that the future Pierre Auger Observatory could be
potentially powerful in probing models with large compact dimensions.


title: Radiative B Decays at CLEO

abstract:
  We report on the status of a variety of radiative B decays studied by the
CLEO detector with $9.7\times 10^6$ $B\bar{B}$ pairs.


title: Decays of b hadrons and a possible new four-quark interaction

abstract:
  A possibility is considered of explaining the low experimental value of the
ratio of the lifetimes tau(Lambda_b)/tau(B_d) by a new `centiweak' four-quark
interaction, i.e with a strength on the order of 10^{-2}G_F. It is noted that
the considered interaction can also improve agreement with the data on low
semileptonic branching ratio B_{sl}(B) in B meson decays with a simultaneous
slight decrease in the prediction for the average charm yield in those decays.
The proposed new interaction modifies within the present experimental limits
the predictions for differences of lifetimes among B mesons, and can thus be
probed by more precise data on these differences. A sample model is briefly
discussed, where the new interaction arises through a weak SU(2) singlet scalar
field with quantum numbers of a diquark.


title: Finite Gluons Ladders and Hadronic Collisions

abstract:
  A truncated BFKL series is studied and applied to hadronic processes. The
proton-(anti)proton cross sections are described with good agreement with data
and in a way consistent with the unitarity bound. The elastic scattering
amplitude is calculated at momentum transfer $t$ different from zero,
introducing two distinct ansatze for the proton impact factor. The elastic
differential cross section is obtained at small $t$ approximation and compared
with the data.


title: The 7/11 Rule and an Estimate of m_rho

abstract: We summarize some recent work on large-Nc sum rules.


title:
Inflationary Brans-Dicke Quantum Universe II: Particular evolutions and
  stability analysis

abstract:
  We made an analysis of the equations of motion which are obtained from the
one - loop effective action for Brans-Dicke gravity with N dilaton - coupled
massless fermions in a time-dependent conformally flat background. Various
particular solutions, including the well-known stationary one, of the
corresponding set of first-order differential equations are given. Some of
these solutions describe an expanding time-dependent Universe with increasing,
constant or also decreasing dilaton. This is illustrated by a numerical
analysis. For the nonstationary solutions a stability analysis is given.


title: A Summary from the Theorist's Point of View

abstract:
  1. Introduction - 2. Astrophysics and Cosmology - 3. Neutrino Oscillations -
4. Higgs and New Physics Searches - 5. Flavour Physics and CP Violation - 6.
QCD - 7. Heavy Ion Collisions - 8. Outlook


title: Natural Chaotic Inflation in Supergravity and Leptogenesis

abstract:
  We comprehensively investigate a chaotic inflation model proposed recently in
the framework of supergravity. In this model, the form of K\"ahler potential is
determined by a symmetry, that is, the Nambu-Goldstone-like shift symmetry,
which guarantees the absence of the exponential factor in the potential for the
inflaton field. Though we need the introduction of small parameters, the
smallness of the parameters is justified also by symmetries. That is, the zero
limit of the small parameters recovers symmetries, which is natural in the 't
Hooft's sense. The leptogenesis scenario via the inflaton decay in this chaotic
inflation model is also discussed. We find that the lepton asymmetry enough to
explain the present baryon number density is produced for low reheating
temperatures avoiding the overproduction of gravitinos.


title: Primordial magnetic fields from inflation???

abstract:
  In this note we argue that the breaking of conformal invariance because of
the coupling of a charged scalar field to gravity is not sufficient for the
production of seed galactic magnetic fields during inflation.


title: Effective Dual Higgs Model with a Dipole-Type Field

abstract:
  The dual Higgs model is reformulated in terms of two-point Wightman functions
with the equations of motion involving higher derivatives. In the system of the
test color charges an analytic expression for the string tension is derived.


title: The light scalars, especially the sigma, in charm decay and elsewhere

abstract:
  We discuss how the lightest scalars, in particular the broad sigma resonance,
can be understood as unitarized (qbar q) states within a unitarized quark model
(UQM). The bare (qbar q) scalars are strongly distorted by hadronic mass
shifts, and the (ubar u+ dbar d) state becomes a very broad resonance, with its
pole at 470-i250 MeV. This is the sigma meson required by models for
spontaneous breaking of chiral symmetry. We also discuss the less well known
phenomenon that with a large coupling there can appear two physical resonance
poles on the second sheet although only one bare quark-antiquark state is put
in. The f_0(980) and f_0(1370) resonance poles can thus be two manifestations
of the same (sbar s) quark state. Both of these are dominant in the E791 Dalitz
plot of D_s-> 3pi, where (sbar s) intermediate states should be dominant.
Recently this light sigma has clearly been observed in D-> sigma pi-> 3pi by
the E791 experiment at Fermilab. We discuss how this decay channel can be
predicted in a Constituent Quark Meson Model (CQM), which incorporates heavy
quark and chiral symmetries.


title:
Stability of the perturbative vacuum against spatial variations of the
  Polyakov loop

abstract:
  We investigate the effective action of the Polyakov loop with spatial
variations. We expand the effective action not in powers of derivatives or
momenta, but in powers of variational amplitudes. At one-loop order the results
suggest that the instability towards the confining vacuum may be caused by the
variational terms.


title: How can one understand the lightest scalars, especially the sigma

abstract:
  We discuss how the a_0(980), f_0(980), K^*_0(1430) and particularly the broad
sigma resonance can be understood within a coupled channel framework, which
includes all light two-pseudoscalar thresholds together with constraints from
Adler zeroes, flavour symmetric couplings, unitarity and physically acceptable
analyticity. All (qbar q) scalars are, when unitarized, strongly distorted by
hadronic mass shifts, and the nonstrange isoscalar state becomes a very broad
resonance, with its pole at 470-i250 MeV. We believe this is the sigma meson
required by models for spontaneous breaking of chiral symmetry. Recently this
light resonance has clearly been observed in D-> sigma pi-> 3pi by the E791
experiment at Fermilab, and we discuss how this decay channel can be predicted
in a Constituent Quark Meson Model (CQM), which incorporates heavy quark and
chiral symmetries. We also discuss the less well known phenomenon that with a
large coupling there can appear two physical resonance poles on the second
sheet although only one bare quark-antiquark state is put in. The f_0(980) and
f_0(1370) resonance poles can thus be two manifestations of the same (sbar s)
quark state. Both of these states are seen clearly in D_s-> 3pi by the E791
experiment, where (sbar s) intermediate states are expected to be dominant.


title: Status of ring-like correlations and wavelets

abstract:
  The problem of large-scale correlations of particles produced in high-energy
collisions is discussed. Among them are, e.g., those correlations which lead to
ring-like and elliptic flow shapes of individual high-multiplicity events in
the polar+azimuthal angles plane. The wavelet method of analysis which allows
to disentangle various patterns is proposed and applied to central Pb-Pb
collisions at 158A GeV.


title: Heavy Quark Production in Hadron Collisions

abstract:
  We compare the numerical predictions for heavy quark production in high
energy hadron collisions in the conventional QCD parton model and the
k_T-factorization approach (semihard theory). The total production cross
sections, one-particle rapidity and p_T distributions as well as several
two-particle correlations are considered. Some of them can help to estimate QCD
scale. The differense in the predictions of the two approaches is not very
large, while the shapes of the distributions are sometimes different.


title:
Neutral top-pion and top-charm production in high energy $e^{+}e^{-}$
  collisions

abstract:
  We calculate the contributions of the neutral top-pion, predicted by
topcolor-assisted technicolor (TC2) theory, to top-charm production via the
processes $\gamma\gamma \longrightarrow\bar{t}c$ and $e^{+}e^{-}\longrightarrow
\gamma\gamma\longrightarrow \bar{t}c$ at the high energy linear $e^{+}e^{-}$
collider (LC) experiments. The cross section is of order $10^{-2}pb$ in most of
the parameter space of TC2 theory, which may be detected at the LC experiments.
So the process $e^{+}e^{-}\longrightarrow \bar{t}c$ can be used to detect the
signature of TC2 theory.


title: Sphaleron in the Dilatonic Gauge Field Theory

abstract:
  Motivated by the Kaluza-Klein theory with a large number of extra spacetime
dimensions, we present a numerical study of static, spherically symmetric
sphaleron solutions coupled to the dilaton fields. We show that sphalerons may
have different dilaton cloud configurations, resulting in new massive
sphalerons, in general. However, there exist different cloud configurations
with different values of the dilaton mass.


title: Analytic Methods in Nonperturbative QCD

abstract:
  Recently developed analytic methods in the framework of the Field Correlator
Method are reviewed in this series of four lectures and results of calculations
are compared to lattice data and experiment. Recent lattice data demonstrating
the Casimir scaling of static quark interaction strongly support the FCM and
leave very little space for all other theoretical models, e.g. instanton
gas/liquid model. Results of calculations for mesons, baryons, quark-gluon
plasma and phase transition temperature demonstrate that new analytic methods
are a powerful tool of nonperturbative QCD along with lattice simulations.


title: Non-Gaussian Effects on Domain Growth

abstract:
  The vacuum two-point function is calculated beyond the Gaussian approximation
during the second order phase transition. It is found that the correlation
function is dominated by the Gaussian term immediately after the phase
transition but later is taken over by non-Gaussian terms as the spinodal
instability continues. The non-Gaussian effects lead to larger size of domains
and may imply a smaller density of topological defects than that predicted by
the Hartree-Fock approximation.

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


title: Spiral Multi-component Structure in Pade - Approximant QCD

abstract:
  We present a graphical method of analyzing the infra-red fixed point
structure of Pade approximant QCD. The analysis shows a spiral multi-component
couplant structure as well as an infra-red attractor behavior of PQCD couplant
for all flavors $0 \le N_{f} \le 16$.


title: (Mis)Understanding the Atmospheric Neutrino Anomaly

abstract:
  The apparent attenuation of muon neutrinos relative to electron neutrinos is
a bit too low to be compatible with the most popular values of $\Delta m^{2}$.
Fits to $R(E_{\nu})$ favor values of $\Delta m^{2}>0.1$ eV$^{2}$. The fit
minimized by the Super Kamioka group in estimating neutrino oscillation
parameters neglects systematic errors. The fit is dominated by systematic
effects. The data being combined in recent fits may not be compatible since
there appear to be significant variations in the properties of the data with
time. A simple two component neutrino oscillation with $\Delta m^{2}$ in the
range of 10$^{-3}$ to 10$^{-2}$ eV$^{2}$ seems unable to account for the
observations.


title: Chiral perturbation theory and the 1/N_c-expansion

abstract:
  We briefly review the effective theory that describes the low energy
properties of QCD with three light quarks and a large number of colours, N_c,
and then discuss the mechanisms that forbid the Kaplan-Manohar transformation
in this framework.


title: Electroweak Radiative Corrections to Off-Shell W-Pair Production

abstract:
  We briefly describe the RacoonWW approach to calculate radiative corrections
to e+ e- -> W W -> 4 fermions and present numerical results for the total
W-pair production cross section at LEP2.


title: QCD at Finite Density

abstract:
  At sufficiently high temperature and density, quantum chromodynamics (QCD)
predicts phase transition from the hadronic phase to the quark-gluon plasma
phase. Lattice QCD is the most useful tool to investigate this critical
phenomenon, which status is briefly reviewed. The usual problem in the
Lagrangian formulation at finite density is either an incorrect continuum limit
or its complex action and a premature onset of the transition as the chemical
potential is raised. We show how the difficulties are overcome in our
Hamiltonian approach.


title:
Naturally Small Seesaw Neutrino Mass with No New Physics Beyond the TeV
  Scale

abstract:
  If there is no new physics beyond the TeV energy scale, such as in a theory
of large extra dimensions, the smallness of the seesaw neutrino mass, i.e.
$m_\nu = m_D^2/m_N$, cannot be explained by a very large $m_N$. In contrast to
previous attempts to find an alternative mechanism for a small $m_\nu$, I show
how a solution may be obtained in a simple extension of the Standard Model,
without using any ingredient supplied by the large extra dimensions. It is also
experimentally testable at future accelerators.


title: Report of the QCD Tools Working Group

abstract:
  We report on the activities of the ``QCD Tools for heavy flavors and new
physics searches'' working group of the Run II Workshop on QCD and Weak Bosons.
The contributions cover the topics of improved parton showering and comparisons
of Monte Carlo programs and resummation calculations, recent developments in
Pythia, the methodology of measuring backgrounds to new physics searches,
variable flavor number schemes for heavy quark electro-production, the
underlying event in hard scattering processes, and the Monte Carlo MCFM for NLO
processes.


title:
Can large fermion chemical potentials suppress the electroweak phase
  transition ?

abstract:
  We calculate the critical temperature $(T_c$) of the electroweak phase
transition in the minimal standard model considering simultaneously temperature
($T$) and fermion chemical potential ($\mu_f$) effects over the effective
potential. The calculation is performed in the one-loop approximation to the
effective potential at non-zero temperature using the real time formalism of
the thermal field theory. We show that it exists a fermion chemical potential
critical value ($\mu_f^c$) for which the Higgs boson condensate vanishes at
T=0. If $T$ and $\mu_f$ effects are considered simultaneously, it is shown that
for $\mu_f \geq \mu_f^c$ then $T_c^2 \leq 0$, implying that the electroweak
phase transition might not take place.


title: New Exact Heavy Quark Sum Rules

abstract:
  Considering nonforward scattering amplitude off the heavy quark in the Small
Velocity limit two exact superconvergent sum rules are derived. The first sum
rule leads to the lower bound \rho^2 > 3/4 for the slope of the Isgur-Wise
function. It also provides the rationale for the fact that the vector heavy
flavor mesons are heavier than the pseudoscalar ones. A spin-nonsinglet
analogue \bar\Sigma of \bar\Lambda = M_B-m_b is introduced.


title: epsilon'/epsilon in the Standard Model

abstract:
  In order to provide an estimate of eps'/eps several effective theories and
physical effects have to be disentangled. In this talk I discuss how it is
possible to predict eps '/eps taking into account all sources of large logs.
  The numerical result one obtains, $\eps '/\eps \sim (1.7\pm 0.6) \cdot
10^{-4}$, is in good agreement with present measurements.


title: Pion and Kaon Vector Form Factors: a Chiral Unitary Approach

abstract:
  The pion and kaon coupled-channel vector form factors are described by making
use of the resonance chiral Lagrangian results together with a suitable
unitarization method in order to take care of the final state interactions. A
very good reproduction of experimental data is accomplished for the vector form
factors up to $\sqrt{s}\leq 1.2$ GeV and for the $\pi\pi$ P-wave phase shifts
up to $\sqrt{s}\leq 1.5$ GeV.


title:
Pomeron intercept from BFKL gluon dynamics in deep inelastic charm
  production at HERA

abstract:
  In the framework of semihard (k$_T$ factorization) QCD approach, we consider
the differential cross sections of $D^{*\pm}$ meson production at HERA. The
consideration is based on BFKL and CCFM gluon distributions. We find that in
the case of BFKL LO gluon distribution the theoretical results are sensitive to
the Pomeron intercept parameter $\Delta$. We present a comparison of the
theoretical results with available ZEUS experimental data.


title: About the end of the electron spectrum in five-lepton $\mu^+$ decay

abstract:
  The spectrum of very fast electrons in five-lepton decay $\mu^+\to
e^-e^+e^+\nu\bar\nu,$ that is the main background decay at the study of the
muonium-antimuonium conversion in vacuum, is considered. The essential decrease
of the spectral distribution is demonstrated when the energy of one positron in
this decay is small. Some arguments for such decrease for arbitrary positron
energies are given.


title: Properties of the scalar mesons $f_0(1370)$, $f_0(1500)$ and $f_0(1710)$

abstract:
  In the three-state mixing framework, considering the possible glueball
components of $\eta$ and $\eta^\prime$, we investigate the hadronic decays of
$f_0(1370)$, $f_0(1500)$ and $f_0(1710)$ into two pseudoscalar mesons. The
quarkonia-glueball content of the three states is determined from the fit to
the new data presented by the WA102 Collaboration. We find that these data are
insensitive to the possible glueball components of $\eta$ and $\eta^\prime$.
Furthermore, we discuss some properties of the mass matrix describing the
mixing of the isoscalar scalar mesons.


title: Supersymmetric Hybrid Inflation

abstract:
  The non-supersymmetric and supersymmetric versions of hybrid inflation are
summarized. It is emphasized that supersymmetric hybrid inflation (with its
extensions) is an extremely "natural" inflationary scenario since it does not
require "tiny" parameters, its superpotential has the most general form allowed
by the symmetries, and it can be protected against radiative or supergravity
corrections. A concrete supersymmetric grand unified theory which leads to
hybrid inflation, solves the mu problem and generates seesaw masses for the
light neutrinos is constructed. The "reheating" which follows hybrid inflation
is studied in this theory. It is shown that the gravitino constraint on the
"reheat" temperature can be "naturally" satisfied. Also, the observed baryon
asymmetry of the universe can be generated via a primordial leptogenesis
consistently with the requirements from solar and atmospheric neutrino
oscillations. Extensions of the standard supersymmetric hybrid inflationary
scenario which are still consistent with all these requirements but can also
avoid the cosmological disaster from the possible copious monopole production
at the abrupt termination of standard hybrid inflation are constructed. They
rely on utilizing the leading non-renormalizable correction to the standard
hybrid inflationary superpotential and are necessary for higher unified gauge
groups which predict the existence of monopoles.


title: Unitarity and geometrical aspects at low x

abstract:
  On the grounds of extension of the U-matrix unitarization to the off-shell
scattering we consider virtual-photon induced scattering. We discuss behavior
of the structure function F_2(x,Q^2) at low x and the total cross-section of
virtual-photon proton scattering and obtain, in particular, the dependence
sigma^{tot}_{gamma^*p}\sim(W^2)^{lambda(Q^2)}, where exponent lambda(Q^2) is
related to the interaction radius of a virtual constituent quark.


title: Intersecting Brane Worlds

abstract:
  It is known that chiral fermions naturally appear at certain intersections of
branes at angles. Motivated by this fact, we propose a string scenario in which
different standard model gauge interactions propagate on different
(intersecting) brane worlds, partially wrapped in the extra dimensions. Quarks
and leptons live at brane intersections, and are thus located at different
positions in the extra dimensions. Replication of families follows naturally
from the fact that the branes generically intersect at several points. Gauge
and Yukawa couplings can be computed in terms of the compactification radii.
Hierarchical Yukawa couplings appear naturally, since amplitudes involving
three different intersections are proportional to exp{-A_{ijk}}, where A_{ijk}
is the area of a string world-sheet extending among the intersections. The
models are non-supersymmetric but the string scale may be lowered down to 1-10
TeV. The proton is however stable due to a set of discrete symmetries arising
from world-sheet selection rules, exact to all orders in perturbation theory.
The scenario has some distinctive features like the presence of KK, winding and
other new excited states (`gonions'), with masses below the string scale and
accessible to accelerators. The models contain scalar tachyons with the quantum
numbers of standard SU(2) x U(1) Higgs doublets, and we propose that they
induce electroweak symmetry breaking in a somewhat novel way. Specific string
models with D4-branes wrapping on T^2 x (T^2)^2/Z_N, leading to three-family
semirealistic spectra, are presented, in which the above properties are
exemplified.


title:
Soft Resummation of Quark Anomalous Dimensions and Coefficient Functions
  in MS-bar Factorization

abstract:
  The asymptotic behaviour at large N of the MS-bar quark anomalous dimensions
is derived to all orders assuming only MS-bar factorization and standard
results for the exponentiation of soft logarithms in the quark initiated bare
cross sections for deep inelastic scattering and Drell-Yan. The result is then
used to write the MS-bar quark coefficient functions in a form in which all
terms of $O(\ln^m N)$ are resummed.


title: Numerical simulations of fragmentation of the Affleck-Dine condensate

abstract:
  We present numerical simulations of fragmentation of the Affleck-Dine
condensate in two spatial dimensions. We argue analytically that the final
state should consist of both Q-balls and anti-Q-balls in a state of maximum
entropy, with most of the balls small and relativistic. Such a behaviour is
found in simulations on a 100x100 lattice with cosmologically realistic
parameter values. During fragmentation process, we observe filament-like
texture in the spatial distribution of charge. The total charge in Q-balls is
found to be almost equal to the charge in anti-Q-balls and typically orders of
magnitude larger than charge asymmetry. Analytical considerations indicate
that, apart from geometrical factors, the results of the simulated two
dimensional case should apply also to the fully realistic three dimensional
case.


title:
Running electromagnetic coupling constant: low energy normalization and
  the value at M_Z

abstract:
  A numerical value for the running electromagnetic coupling constant in the MS
scheme is calculated at the low energy normalization scale equal to the
tau-lepton mass M_\tau. This low energy boundary value is used for running the
electromagnetic coupling constant to larger scales where high precision
experimental measurements can be performed. Particular scales of interest are
the b-quark mass for studying the \Upsilon-resonance physics and the Z-boson
mass M_Z for high precision tests of the standard model and for the Higgs mass
determination from radiative corrections. A numerical value for the running
electromagnetic coupling constant at M_Z in the on-shell renormalization scheme
is also given.


title:
Matter effects in oscillations of neutrinos traveling short distances in
  matter

abstract:
  It is well known that when the distance $t$ traveled by neutrinos in matter
is short, matter effects in oscillations of neutrino flavour are small and
decrease with decreasing $t$ more rapidly than the oscillations effects
themselves. We discuss the reason for this and demonstrate that under certain
circumstances this statement is no longer correct. In particular, we show that
if neutrinos propagate significant distances in vacuum before entering matter
(or after exiting it), matter effects in short-$t$ neutrino oscillations can be
significantly enhanced. Implications for oscillations of solar and atmospheric
neutrinos with nearly horizontal trajectories inside the earth and for
accelerator experiments are considered. We also comment on neutrino
oscillations in matter due to flavour changing neutral currents.


title: Some exact solutions of the Dirac equation

abstract:
  Exact analytic solutions are found to the Dirac equation for a combination of
Lorentz scalar and vector Coulombic potentials with additional non-Coulombic
parts. An appropriate linear combination of Lorentz scalar and vector
non-Coulombic potentials, with the scalar part dominating, can be chosen to
give exact analytic Dirac wave functions.


title: Searching Scalar Resonances with Ultra-high Energy Neutrinos

abstract:
  We study the prospects of detecting signals of a resonant scattering of
high-energy cosmic neutrinos on electrons in the atmosphere. Such a process is
possible through an s-channel exchange of a isotriplet scalar particle
predicted by some particle physics theories. We estimate the event rates for a
reference detector setup with plausible assumptions on the interaction
strengths and energy resolutions. We find as the most promising process the
resonance production of tau neutrinos whose signature would be a "quiet" (in
contrast with a hadronic "bang") production of the tau lepton followed by a
more noisy decay in downstream.


title: Randall-Sundrum Phenomenology at Linear Colliders

abstract:
  The physics of the Randall-Sundrum model relevant for future linear colliders
is briefly summarized. The differences between the case where Standard
Model(SM) fields are on the wall and where they are in the bulk are emphasized.


title: Theoretical Chiral Dynamics

abstract:
  The reasons why a considerable effort is made to resolve the low energy
structure of QCD are discussed. The effective field theory used for this
purpose is illustrated with the recent progress made in the predictions for
pipi scattering and in understanding the low energy properties of the theory in
the large Nc limit.


title: Supersymmetric seesaw model for the (1+3)-scheme of neutrino masses

abstract:
  A four-neutrino spectrum with a sterile neutrino without significant
involvement in the atmospheric and solar neutrino oscillation experiments has
been recently advocated as the correct picture to explain all existing
experimental data. We propose a supersymmetric model in which this picture can
be naturally implemented. In this model, the mass for the mainly active
neutrino eigenstates is induced by the seesaw mechanism with a large
intermediate scale $M_R$, whereas the mass for the mainly sterile neutrino
state is closely related to supersymmetry breaking.


title: Top mixing in effective theories

abstract:
  We review how top mixing with light quarks constrains new physics beyond the
Standard Model using the effective Lagrangian approach.


title: Large top mixing from extra dimensions

abstract:
  Fermion mixing is conveniently described using the effective Lagrangian
formalism. We apply this approach to study top mixing in models with an
infinite tower of Kaluza-Klein fermion excitations. In the Randall-Sundrum
background with a boundary Higgs and phenomenologically viable values of the
model parameters, the only effect eventually observable is the loss of
universality of the top couplings. Their deviation from the SM predictions can
be up to 4 % if the five-dimensional Yukawa couplings times the AdS_5 curvature
scale are < 10.


title:
The bound on the mass of the new gauge boson $Z^{\prime}$ from the
  process $\mu\longrightarrow 3e$

abstract:
  The new gauge boson $Z^{\prime}$ predicted by the strong top dynamical
symmetry breaking models has significant contributions to the lepton flavor
changing process $\mu\longrightarrow 3e $. We consider the bound on the mass of
the new gauge boson $Z^{\prime}$ from the experimental value of the branching
ratio $Br(\mu\longrightarrow 3e)$ in the framework of topcolor assisted
technicolor models. We find that the precision experimental value of
$Br(\mu\longrightarrow 3e)$ gives a severe bound on the $Z^{\prime}$ mass
$M_{Z^{\prime}}$. For $k_1 \leq 1$, $M_{Z^{\prime}}$ must be larger than 1.64
$TeV$.


title:
Matrix Elements of Four-quark Operators Relevant to Lifetime Difference
  \Delta \Gamma_{B_s} from QCD Sum Rules

abstract:
  We extract the matrix elements of four quark operators O_{L,S} relevant to
the B_s and \bar B_s life time difference from QCD sum rules. We find the
vacuum saturation approximation works reasonably well, i.e., within 10%. We
discuss the implications of our results and compare them with the recent
lattice QCD determination.


title:
Chiral dynamics in the presence of bound states: kaon-nucleon
  interactions revisited

abstract:
  We study the S-wave kaon-nucleon interactions for strangeness S=-1 in a novel
relativistic chiral unitary approach based on coupled channels. Dispersion
relations are used to perform the necessary resummation of the lowest order
relativistic chiral Lagrangian. A good description of the data in the K^- p,
\pi \Sigma and \pi \Lambda channels is obtained. We show how this method can be
systematically extended to higher orders, emphasizing its applicability to any
scenario of strong self-interactions where the perturbative series diverges
even at low energies. Discussions about the differences to existing approaches
employing pseudo-potentials in a regulated Lippmann-Schwinger equation are
included. Finally, we describe the resonance content of our meson-baryon
amplitudes and discuss its nature.


title: Extra dimensions prefer large $\tan\beta$

abstract:
  Assuming that the recent result obtained from the Monte Carlo simulations on
the nonperturbative existence of the pure SU(2) Yang-Mills theory in five
dimensions can be applied to a more general class of higher-dimensional gauge
theories, we derive the conditions imposed by the nontriviality requirement on
the theories. We find that the supersymmetric grand unified theories with extra
dimensions prefer a large value ($\gsim 2$) of $\tan\beta$ of the minimal
supersymmetric standard model, in accord with today's possible observation of
the Higgs particle at LEP2.


title: Quantum effects of compactified AdS_5 geometry on the higgs potential

abstract:
  In this paper we determine the one loop radiative correction to the higgs
potential due to quantum fluctuations about the background metric of
Randall-Sundrum model. We then examine the effects of the one loop effective
potential on the stability of the classical vacuum paying particular attention
to the tadpole terms which could dominate over the classical potential for
small field configurations. We find that although the one loop potential due to
scale fluctuations could develop a tadpole term in certain regions of the
parameter space, it is positive for either sign of H. The quadratic and quartic
terms in the radiative correction are too small to cause any instability to the
classical vacuum for field configurations that do not violate the limits of
ordinary perturbation theory.


title: Large Effects of CP- and T-Violation in K^0 Decay

abstract:
  The epsilon-impurity of the K_L wave-function gives rise to a huge
CP-violating effect in the decay K_L -> pi^+ pi^- gamma which is hidden in the
polarization state (Stokes vector) of the photon. One component of the Stokes
vector is CP-odd and T-even, and may be identified with circular polarization.
Another component is CP-odd and T-odd (``oblique polarization'') and reveals
itself as a large asymmetry (14%) in the decay K_L -> pi^+ pi^- e^+ e^-.
Striking time-dependent effects are predicted in the angular distribution of
the pi^+ pi^- e^+ e^- system emanating from an initial K^0 or K^0bar state.


title: Neutrino Unification

abstract:
  Present neutrino data are consistent with neutrino masses arising from a
common seed at some ``neutrino unification'' scale $M_X$. Such a simple
theoretical ansatz naturally leads to quasi-degenerate neutrinos that could lie
in the electron-volt range with neutrino mass splittings induced by
renormalization effects associated with supersymmetric thresholds. In such a
scheme the leptonic analogue of the Cabibbo angle $\theta_{\odot}$ describing
solar neutrino oscillations is nearly maximal. Its exact value is correlated
with the smallness of $\theta_{reactor}$. These features agree both with latest
data on the solar neutrino spectra and with the reactor neutrino data. The two
leading mass-eigenstate neutrinos present in \ne form a pseudo-Dirac neutrino,
avoiding conflict with neutrinoless double beta decay.


title: A Model of Elementary Particle Interactions

abstract:
  There is a second kind of light which does not interact with our electrons.
However it interacts with some of our protons (p) and some of our neutrons (n)
which are both of two kinds: protons (p, p`), neutrons (n`, n) differing in the
two kinds of charges (Q1, Q2) associated with the two kinds of light. p [p`]
and n` [n] have (Q1, Q2) values equal to (1, 1) [(1, 0)] and (0, 0) [(0, 1)]
respectively. There is also a second kind of electron (Q2 =1, Q1= 0), equal in
mass to our electron (Q1 = -1, Q2= 0), which does not interact with our (the
first) kind of light. Three major scenarios S1, S2 and X4 arise. In S1, matter
in the solar system on large scales is predominantly neutralized in both kinds
of charges and the weak forces of attraction among the sun and planets are due
to a fundamental force of nature. However in this scenario we must postulate
that human consciousness is locked on to chemical reactions in the retina
involving the first kind of light and the first kind of electrons only. It is
oblivious to the simultaneous parallel chemical reactions governed by a
chemistry which is based on the second kind of light and the second kind of
anti-electrons and involves the same physical atoms manifesting different
atomic numbers Z` (= Q2). In scenario S2, matter in the solar system on large
scales is predominantly neutralized in the first kind of charge only. In this
scenario human consciousness is not restricted in its awareness to a narrowly
>....... continued


title: Higher-Fock States and the Covariance of the Light-Front Quark Model

abstract:
  The light-front quark model has been successful in describing various meson
properties. We apply the model to the meson weak decays and discuss the
covariance of the model. We find that the inclusion of the higher-Fock
state(i.e. nonvalence or so called Z-graph) contributions is necessary to
recover the covariance of the light-front quark model. We present the
possibility of the effective calculation of the higher-Fock state contributions
to restore the covarince in the light-front model.


title: Neutrino Oscillations Induced by Two-loop Radiative Effects

abstract:
  Phenomena of neutrino oscillations are discussed on the basis of two-loop
radiative neutrino mechanism. Neutrino mixings are experimentally suggested to
be maximal in both atmospheric and solar neutrino oscillations. By using $L_e -
L_\mu - L_\tau$ ($\equiv L^\prime$)-conservation, which, however, only ensures
the maximal solar neutrino mixing, we find that two-loop radiative mechanism
dynamically generates the maximal atmospheric neutrino mixing and that the
estimate of $\Delta m^2_\odot/\Delta m^2_{atm} \sim\epsilon m_e/m_\tau$
explains $\Delta m^2_\odot/\Delta m^2_{atm} \ll 1$ because of $m_e/m_\tau \ll
1$, where $\epsilon$ measures the breaking of the $L^\prime$-conservation.
Together with $\Delta m^2_{atm} \approx 3\times 10^{-3}$ eV$^2$, this estimate
yields $\Delta m^2_\odot \sim 10^{-7}$ eV$^2$ for $\epsilon \sim 0.1$, which
corresponds to the LOW solution to the solar neutrino problem. Neutrino mass
scale is given by $(16\pi^2)^{-2} m_em_\tau /M$ ($M \sim$ 1 TeV), which is of
order 0.01 eV.


title: Degeneracy Symmetry Of Baryon Spectra

abstract:
  We present a data-supported new interpretation of the Rarita-Schwinger fields
which reveals a well-defined pattern in the masses, spins, and parities of the
N-, Delta -, and Lambda -hyperon excitations and which allows to probe the
scale of the chiral phase transition for baryons. The degeneracy symmetry of
the baryonic spectra emerges to be Isospin(x)Space- Time.


title: Testing the Universality of Fragmentation Functions

abstract:
  Using fragmentation functions for charged pions, charged kaons, and
(anti)protons recently extracted from experimental data of e^+e^- annihilation
at the Z-boson resonance and at centre-of-mass energy root(s) = 29 GeV, we
perform a global study of inclusive charged-hadron production in p anti-p,
gamma p, and gamma gamma collisions at next-to-leading order in the parton
model of quantum chromodynamics. Comparisons of our results with p anti-p data
from CERN S p anti-p S and the Fermilab Tevatron, gamma p data from DESY HERA,
and gamma gamma data from CERN LEP2 allow us to test the universality of the
fragmentation functions predicted by the factorization theorem. Furthermore, we
perform comparisons with (e^+e^-)-annihilation data from LEP2 so as to test the
scaling violations predicted by the Altarelli-Parisi evolution equations.


title: Signatures of Precocious Unification in Orbiting Detectors

abstract:
  It has been conjectured that the string and unification scales may be
substantially lower than previously believed, perhaps a few TeV. In scenarios
of this type, orbiting detectors such OWL or AIRWATCH can observe spectacular
phenomena at trans-GZK energies. We explore measurable signatures of the
hypothesis that trans-GZK air showeres (``anomalous showers'') are originated
by strongly interacting neutrinos. The results of a MC simulation of such air
showers is described. A distinction between proton induced and ``anomalous''
showers becomes possible once a substantial sample of trans-GZK showers will be
available.


title: Molecular status of non-qq mesons

abstract:
  The relativistic four-quark equations are found in the framework of the
dispersion relation technique. The calculations of non-qq meson amplitudes
estimate the contributions of three subamplitudes: four-quark amplitude,
glueball amplitude and hadronic molecule amplitudes.


title:
The masses of the mesons and baryons. Part IV. Integer multiple rule
  extension

abstract:
  It is shown that the empirical rule that the masses of the stable mesons and
baryons of the gamma-branch are integer multiples of the mass of the pi0 meson
with a maximal deviation of 3.3% holds also for the meson and baryon
resonances, regardless whether the spin of the particles is 0 or 1/2. It is
also shown that the masses of the particles with weak decay are integer
multiples of the mass of the charged mesons times a common factor 0.853.


title:
LATTICEEASY: A Program for Lattice Simulations of Scalar Fields in an
  Expanding Universe

abstract:
  We describe a C++ program that we have written and made available for
calculating the evolution of interacting scalar fields in an expanding
universe. The program is particularly useful for the study of reheating and
thermalization after inflation. The program and its full documentation are
available on the Web at http://physics.stanford.edu/gfelder/latticeeasy/ . In
this paper we provide a brief overview of what the program does and what it is
useful for.


title: The Development of Equilibrium After Preheating

abstract:
  We present a fully nonlinear study of the development of equilibrium after
preheating. Preheating is the exponentially rapid transfer of energy from the
nearly homogeneous inflaton field to fluctuations of other fields and/or the
inflaton itself. This rapid transfer leaves these fields in a highly nonthermal
state with energy concentrated in infrared modes. We have performed lattice
simulations of the evolution of interacting scalar fields during and after
preheating for a variety of inflationary models. We have formulated a set of
generic rules that govern the thermalization process in all of these models.
Notably, we see that once one of the fields is amplified through parametric
resonance or other mechanisms it rapidly excites other coupled fields to
exponentially large occupation numbers. These fields quickly acquire nearly
thermal spectra in the infrared, which gradually propagates into higher
momenta. Prior to the formation of total equilibrium, the excited fields group
into subsets with almost identical characteristics (e.g. group effective
temperature). The way fields form into these groups and the properties of the
groups depend on the couplings between them. We also studied the onset of chaos
after preheating by calculating the Lyapunov exponent of the scalar fields.

categories: hep-ph astro-ph gr-qc hep-lat hep-th nlin.CD


title:
Improved approach to the heavy-to-light form factors in the light-cone
  QCD sum

abstract:
  A systematic analysis shows that the main uncertainties in the form factors
are due to the twist-3 wave functions of the light mesons in the light-cone QCD
sum rules. We propose an improved approach, in which the twist-3 wave functions
doesn't make any contribution and therefore the possible pollution by them can
be avoided, to re-examine $B \to \pi$ semileptonic form factors. Also, a
comparison between the previous and our results from the light-cone QCD sum
rules is made. Our method will be beneficial to the precise extracting of
$\mid{V_{ub}}\mid$ from the experimental data on the processes $B \to \pi \ell
\widetilde{\nu_\ell}$.


title: Tests of Spacetime Symmetry with Particle Traps

abstract:
  Lorentz and CPT symmetry have been tested at high precision in numerous
experiments. A general theoretical framework incorporating possible Lorentz and
CPT violation in an extension of the standard model of particle physics has
been developed. In this framework, analyses of several precision experiments
have been performed to find unsuppressed symmetry-violating signals. This paper
discusses features of the theory, presents results for trapped-particle
systems, and reports bounds from recent experiments.


title: Challenges in Hyperon Decays

abstract:
  We give an personal overview of some of the unsolved problems related to
hyperon decays. We cover nonleptonic decays, radiative decays and magnetic
moments. Some of the theoretical issues are also touched upon.


title: Chiral Perturbation Theory and Unitarization

abstract:
  We review our recent work on unitarization and chiral perturbation theory
both in the $\pi\pi$ and the $\pi N$ sectors. We pay particular attention to
the Bethe-Salpeter and Inverse Amplitude unitarization methods and their recent
applications to $\pi\pi$ and $\pi N$ scattering.


title:
Weyl symmetric representation of hadronic flux tubes in the dual
  Ginzburg-Landau theory

abstract:
  Hadronic flux-tube solutions describing the mesonic and the baryonic states
within the dual Ginzburg-Landau (DGL) theory are investigated by using the dual
lattice formulation in the Weyl-symmetric approach. The shape of the flux tubes
is determined by placement of the color-electric Dirac-string singularity
treated as a connected stack of quantized plaquettes in the dual lattice
formulation. The Weyl symmetric profiles of the hadronic flux tubes are
obtained by using the manifestly Weyl invariant representation of the dual
gauge field.


title:
Meson twist-4 parton distributions in terms of twist-2 distribution
  amplitudes at large Nc

abstract:
  We show that in the large N_c limit four-quark twist-4 distributions in the
pion can be expressed in terms of twist-2 pion distribution amplitude. This
allows us to compute the isospin-2 structure function of the pion
F_2^{I=2}(x_B) in the large N_c limit. The method can be easily applied to
other mesons as well.


title:
Parametrization of proton-proton total cross section from 10 GeV to 100
  TeV

abstract:
  Present estimations of proton-proton total cross section at very high
energies are obtained from cosmic rays (>10^17 eV) by means of some
approximations and the knowledge of the measured proton-air cross section at
these energies. Besides, total cross section are measured with present day high
energy colliders up to nearly 2 TeV in the center of mass (~ 10^15 eV in the
laboratory). Here we use a phenomenological model based on the
Multiple-Diffraction approach to succesfully describe data at accelerator
energies. Then we estimate with it proton-proton total cross sections at cosmic
ray energies. On the basis of a forecasting regression analysis we determine
confident errors bands, analyzing the sensitivity of our predictions to the
employed data for extrapolation.


title: Neutrino Oscillations in Extended Anti-GUT Model

abstract:
  What we call the Anti-GUT model is extended a bit to include also
right-handed neutrinos and thus make use of the see-saw mechanism for neutrino
masses. This model consists in assigning gauge quantum numbers to the known
Weyl fermions and the three see-saw right-handed neutrinos. Each family
(generation) is given its own Standard Model gauge fields and a gauge field
coupled to the $B-L$ quantum number for that family alone. Further we assign a
rather limited number of Higgs fields, so as to break these gauge groups down
to the Standard Model gauge group and to fit, w.r.t. order of magnitude, the
spectra and mixing angles of the quarks and leptons. We find a rather good fit,
which for neutrino oscillations favours the small mixing angle MSW solution,
although the mixing angle predicted is closest to the upper side of the
uncertainty range for the measured solar neutrino mixing angle. An idea for
making a ``finetuning''-principle to ``explain'' the large ratios found
empirically in physics, and answer such questions as ``why is the weak scale
low compared to the Planck scale?'', is proposed. A further very speculative
extension is supposed to ``explain'' why we have three families.


title:
Elastic $\nu e^-$ scattering of solar neutrinos with electromagnetic
  moments

abstract:
  We consider the azimuthal asymmetry of the recoil electrons in elastic $\nu
e^-$ scattering of solar neutrinos, which can arise if neutrinos have
electromagnetic moments and there is a large solar magnetic field. We show that
using this effect it is not possible to distinguish between magnetic and
electric dipole moment in the 1-Dirac and 2-Majorana neutrino cases and that
averaging over neutrino energy is important and suppresses the azimuthal
asymmetry in the 2-Majorana case.


title: Flavor Alignment in SUSY GUTs

abstract:
  A Supersymmetric Grand unified model is constructed based on SO(10)xSO(10)
symmetry in which new types of Yukawa matrices couple standard and exotic
fermions. Evolution of these couplings from the Grand Unified scale to the
electroweak scale causes some of them to be driven to their fixed points. This
solves the supersymmetric alignment problem and ensures that there are no
observable flavor changing neutral currents mediated by supersymmetric
particles. Fermion hierarchy and neutrino mixing constraints are automatically
satisfied in this formalism.


title:
Exploring CPT violation in $B\to J/\psi K$ decays using kaon
  regeneration

abstract:
  We present an analysis of CPT violation in $B\to J/\psi K$ decays. A method
of kaon regeneration is proposed to increase the $K_{S(L)}$ interference
effects. With the time evolution of both neutral B and K mesons, we show that
it is possible to determine the CPT violating parameter in $B^0-\bar{B^0}$
mixing or constrain it.


title: Generating Neutrino Mass in the 331 Model

abstract:
  A mechanism for generating small tree-level Majorana mass for neutrinos is
implemented in the 331 Model. No additional fermions or scalars need to be
added, and no mass scale greater than a few TeV is invoked.


title:
Probing Z' gauge boson with the spin configuration of top quark pair
  production at future $e^- e^+$ linear colliders

abstract:
  We explore the effects of extra neutral gauge boson involved in the
supersymmetric E6 model on the spin configuration of the top quark pair
produced at the polarized e- e+ collider. Generic mixing terms are considered
including kinetic mixing terms as well as mass mixing. In the off-diagonal spin
basis of the standard model, we show that the cross sections for the suppressed
spin configurations can be enhanced with the effects of the Z' boson through
the modification of the spin configuration of produced top quark pair enough to
be measured in the Linear Colliders, which provides the way to observe the
effects of Z' boson and discriminate the pattern of gauge group decomposition.
It is pointed out that the kinetic mixing may dilute the effects of mass mixing
terms, and we have to perform the combined analysis.


title: Light Hadron Spectroscopy at BEPC

abstract:
  The $J/\Psi$ and $\Psi'$ experiments at the Beijing Electron Positron
Collider (BEPC) play a unique role in many aspects of light hadron
spectroscopy, such as hunting for glueballs and hybrids, extracting $u\bar
u+d\bar d$ and $s\bar s$ components of mesons, and studying excited nucleons
and hyperons, i.e., $N^*$, $\Lambda^*$, $\Sigma^*$ and $\Xi^*$ resonances.
Physics objectives, recent results and future prospects of light hadron
spectroscopy at BEPC are presented.


title:
Charmless decays B -> PP, PV, and effects of new strong and electroweak
  penguins in Topcolor-assisted Technicolor model

abstract:
  Based on the low energy effective Hamiltonian with generalized factorization,
we calculate the new physics contributions to the branching ratios and
CP-violating asymmetries of the two-body charmless hadronic decays $B \to PP,
PV$ from the new strong and electroweak penguin diagrams in the TC2 model. The
top-pion penguins dominate the new physics corrections, and both new gluonic
and electroweak penguins contribute effectively to most decay modes. For
tree-dominated decay modes $B \to \pi \pi, \rho \pi, etc,$ the new physics
corrections are less than 10%. For decays $B \to K^{(*)} \pi$, $K^{(*)} \eta$,
$etc$, the new physics enhancements can be rather large (from $- 70%$ to $\sim
200%$) and are insensitive to the variations of $N_c^{eff}$, $k^2$, $\eta$ and
$m_{\tilde{\pi}}$ within the reasonable ranges. For decays $B^0 \to \phi \pi$,
$\phi \eta^{(')}$, $K^* \bar{K}^0$ and $\rho^+ K^0$, $\delta {\cal B}$ is
strongly $N_c^{eff}-$dependent: varying from -90% to $\sim 1680%$ in the range
of $N_c^{eff}=2-\infty$. The new physics corrections to the CP-violating
asymmetries ${\cal A}_{CP}$ vary greatly for different B decay channels. For
five measured CP asymmetries of $B \to K \pi, K \eta', \omega \pi$ decays,
$\delta {\cal A}_{CP}$ is only about 20% and will be masked by large
theoretical uncertainties. The new physics enhancements to interesting $B \to K
\eta'$ decays are significant in size ($\sim 50%$), insensitive to the
variations of input parameters and hence lead to a plausible interpretation for
the unexpectedly large $B \to K \eta'$ decay rates. The TC2 model predictions
for branching ratios and CP-violating asymmteries of all fifty seven $B \to PP,
PV$ decay modes are consistent with the available data within one or two
standard deviations.


title:
Ultra-High Energy Neutrinos: A Review of Theoretical and
  Phenomenological Issues

abstract:
  We review the phenomenology of ultra-high energy (UHE) neutrino detection.
The motivations for looking for such neutrinos stemming from observational
evidence and the potential for new physics discoveries are enumerated, and
their expected sources and fluxes are given. Cross-sections with nucleons all
the way upto neutrino energies of 10^20 eV, and the attenuation of the fluxes
in the earth are discussed. Finally, sample event-rates for existing and future
Water/Ice Cerenkov detectors are provided.


title: Physics From Extra Dimensions

abstract:
  A brief review of the recent developments in the physics from extra
dimensions is given with a focus on the effects of Kaluza-Klein excitations in
the Standard Model sector. It is shown that the current accurate data on the
Fermi constant and on other electro-weak parameters puts a lower bound on the
scale of extra dimensions of $\sim$ 3 TeV, and thus the observation of such
dimensions lies beyond the reach of accelerators in the near future. The
correction to the anomalous magnetic moment of the muon from extra dimensions
is discussed and one finds that with the current limit on the scale of extra
dimensions from the Fermi constant, the correction to $g_{\mu}-2$ does not
compete with the potentially large contributions from the supersymmetric
electro-weak correction. The possibility of generating Kaluza-Klein excitations
associated with large radius compactifications at the LHC is discussed. It is
shown that if such excitations are indeed produced their resonance structure
will encode information on the number of compactified dimensions as well as on
the nature of the specific orbifold compactification. A brief discussion of
difficulties such as rapid proton decay that one encounters in theories with
large radius compactifications is given.


title:
On dependence of nonperturbative contributions in $\bar\alpha_s(q^2)$ on
  an initial approximation of perturbation theory in an analytic approach to
  QCD

abstract:
  In the framework of analytic approach to QCD, which has been recently
intensively developed, the dependence of nonperturbative contributions in a
running coupling of strong interaction on initial perturbative approximation to
3-loop order is studied. The nonperturbative contributions are obtained in an
explicit form. In the ultraviolet region they are shown to be represented in
the form of the expansion in the inverse powers of Euclidean momentum squared.
The expansion coefficients are calculated for different numbers of active quark
flavors $n_f$ and for different numbers of loops taken into account. For all
$n_f$ of interest it is shown that 2-loop order and 3-loop order corrections
result in partial compensation of 1-loop order leading in the ultraviolet
region nonperturbative contribution.


title: $B \to J/\psi K$ Decays in QCD Factorization

abstract:
  The hadronic decays $B\to J/\psi K(K^*)$ are interesting because
experimentally they are the only color-suppressed modes which have been
measured, and theoretically they are calculable by QCD factorization even the
emitted meson $J\psi$ is heavy. We analyze the decay $B\to J\psi K$ within the
framework of QCD factorization in the heavy quark limit. We show explicitly the
scale and $\gamma_5$-scheme independence of decay amplitudes and infrared
safety of nonfactorizable corrections at twist-2 order. Leading-twist
contributions from the light-cone distribution amplitudes (LCDAs) of the mesons
are too small to accommodate the data; the nonfactorizable corrections to naive
factorization are small and not significant. We study the twist-3 effects due
to the kaon and find that the coefficient $a_2(J\psi K)$ is largely enhanced by
the nonfactorizable spectator interactions arising from the twist-3 kaon LCDA
$\phi^K_\sigma$, which are formally power-suppressed but chirally,
logarithmically and kinematically enhanced. Therefore, factorization breaks
down at twist-3 order. Higher-twist effects of $J\psi$ are briefly discussed.
Our result also resolves the long-standing sign ambiguity of $a_2(J\psi K)$,
which turns out to be positive for its real part.


title: Periodic Theta Vacuum Model and the QCD Instanton Vacuum

abstract:
  We formulate a toy model for the $\theta$ vacuum that embodies the n-point
moments of the even and odd topological charge densities. The partition
function is $2\pi$ periodic only after resumming over all winding modes. We
apply the same analysis to the quenched instanton vacuum at finite $\theta$ and
derive saddle-point results for the vacuum energy density that are manifestly
$2\pi$ periodic whatever $\theta$. We briefly discuss the consequences of
unquenching the fermions on our results.


title: |V_{ub}| From Semileptonic Decay and b -> s gamma

abstract:
  Current errors on |V_{ub}| are dominated by model dependence. For inclusive
decays, the model dependence comes from the Fermi motion of the b quark. By
combining the endpoint photon and lepton spectra from the inclusive decays B ->
X_s gamma and B -> X_u l nu, it is possible to remove this model dependence. We
show how to combine these rates including the resummation of the endpoint logs
at next to leading order. The theoretical errors on |V_{ub}| on the order of
10% are possible. We also give a brief discussion on comparing different
extractions.


title:
Screening length, dispersion relations and quark potential in thermo
  field dynamics

abstract:
  The screening length in a quark-gluon plasma, the dispersion relations of
thermal gluon self-energy and the quark potential at high temperature are
studied within thermo field dynamics framework. By calculation of the real and
imaginary parts, of the gluon self-energy in one-loop order in thermo field
dynamics, we obtain an expression for the screening length in a quark-gluon
plasma and the dispersion relation between the real and imaginary parts. At
high temperature, using photon exchange between electron-positron in a skeleton
expansion and ladder approximation, the screened Coulomb potential is obtained,
and using one-gluon and two-gluon exchange between a quark-antiquark, we get an
expression for the screened quark potential up to $O(g amplitudes of generic
process taking place in a many body system in equilibrium at temperature T. The
relationship of the scattering and decay amplitudes as calculated in Thermo
Field Dynamics to the conventional techniques is established. It is shown that
in many cases the calculations are relatively easy in TFD.


title: Factorization vs. Flavor SU(3) in Charmless B Decays

abstract:
  Two types of predictions for charmless B decays are compared. One involves
estimates based on factorization and models for form factors, while the other
involves the use of flavor SU(3), sometimes with assumptions about the
smallness of certain amplitudes. After a comparison of some factorization
predictions with recent data, specific decays of $B$ mesons to two charmless
mesons are discussed.


title: Comments on CKM elements

abstract:
  The sensitivity of determination of elements of the Cabibbo-Kobayashi-Maskawa
(CKM) matrix to experimental inputs (particularly $|V_{cb}|$) is discussed and
caution in assigning probable errors is urged.


title: Constraints on T-Odd, P-Even Interactions from Electric Dipole Moments

abstract:
  We construct the relationship between nonrenormalizable,effective,
time-reversal violating (TV) parity-conserving (PC) interactions of quarks and
gauge bosons and various low-energy TVPC and TV parity-violating (PV)
observables. Using effective field theory methods, we delineate the scenarious
under which experimental limits on permanent electric dipole moments (EDM's) of
the electron, neutron, and neutral atoms as well as limits on TVPC observables
provide the most stringent bounds on new TVPC interactions. Under scenarios in
which parity invariance is restored at short distances, the one-loop EDM of
elementary fermions generate the most severe constraints. The limits derived
from the atomic EDM of $^{199}$Hg are considerably weaker. When parity symmetry
remains broken at short distances, direct TVPC search limits provide the least
ambiguous bounds. The direct limits follow from TVPC interactions between two
quarks.


title:
Constraints on color dipole-nucleon cross section from diffractive heavy
  quarkonium production

abstract:
  We study the hard color dipole-nucleon cross section within perturbative QCD
and discuss its relation to observables in diffractive leptoproduction of heavy
quarkonium. The dipole cross section calculated with the unintegrated gluon
density of the nucleon substantially differs from the well-known perturbative
form $\sigma_{dip} \sim b^2$ for $b > 0.3$fm, where $b$ is the transverse
separation of the dipole. We show the measured ratio of $\psi '$ to $J / \psi$
photoproduction cross sections constrains the dipole cross section at
intermediate $b$, and in fact excludes the simple $\sigma_{dip} \sim b^2$
behavior. We also calculate the $t$-slopes of the diffractive $J / \psi, \psi
'$ productions. We emphasize the difference of $t$-slopes, $B_{J/\psi} -
B_{\psi '}$, is dominated by the dipole-nucleon dynamics. This difference is
found to be about $0.3 {GeV}^{-2}$ with our dipole cross section.


title: Tunneling Phenomena in Cosmology: Some Fundamental Problems

abstract:
  The fundamental problem of how tunneling in thermal medium is completed is
addressed, and a new time scale of order 1/friction for its termination, which
is usually much shorter than the Hubble time, is pointed out. Enhanced
non-linear resonance is responsible for this short time scale. This phenomenon
occurs when the semiclassical periodic motion in a metastable potential well
resonates with one of the environment harmonic oscillators coupled to its
motion.


title: Fermion families, and chirality through extra dimensions

abstract:
  We give a simple model to explain the origin of fermion families, and
chirality through the use of a domain wall placed in a five dimensional
space-time.


title: Imprints of Nonextensivity in Multiparticle Production

abstract:
  The statistical methods based on the classical Boltzmann-Gibbs (BG) approach
are at heart of essentially all descriptions of multiparticle production
processes. In many cases, however, one observes some deviations from the
expected behaviour. It is also known that conditions necessary for the BG
statistics to apply are usually satisfied only approximately. Two attitudes are
possible in such situations: either to abandon statistical approach trying some
other model or to generalise it to the so called nonextensive statistics
(widely used in the similar circumstances in many other branches of physics).
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.


title: QED Corrections to Neutrino Electron Scattering

abstract:
  We evaluate the O(alpha) QED corrections to the recoil electron energy
spectrum in the process nu_l + e --> nu_l + e (+gamma), where (+gamma)
indicates the possible emission of a photon and l=e, mu or tau. The soft and
hard bremsstrahlung differential cross sections are computed for an arbitrary
value of the photon energy threshold. We also study the O(alpha) QED
corrections to the differential cross section with respect to the total
combined energy of the recoil electron and a possible accompanying photon.
Their difference from the corrections to the electron spectrum is investigated.
We discuss the relevance and applicability of both radiative corrections,
emphasizing their role in the analysis of precise solar neutrino electron
scattering experiments.


title:
Quark structure of f0(980) from the radiative decays phi(1020)->gamma
  f0(980), gamma eta, gamma eta', gamma pi0 and f0(980)->gamma gamma

abstract:
  Partial widths of the radiative decays $\phi(1020)\to\gamma f_0(980)$,
$\gamma\eta$, $\gamma\eta'$, $\gamma\pi^0$ and $f_0(980)\to\gamma\gamma$ are
calculated assuming all mesons under consideration to be $q\bar q$ states:
$\phi(1020)$ is dominantly an $s\bar s$ state ($n\bar n$ component $\lesssim
1%$), $\eta$, $\eta'$ and $\pi^0$ are standard $q\bar q$ states, $\eta = n\bar
n\cos\theta - s\bar s\sin\theta$ and $\eta'=n\bar n\sin\theta + s\bar
s\cos\theta$ with $\theta\simeq 37^\circ$, and $f_0(980)$ is the $q\bar q$
meson with the flavour wave function $n\bar n\cos\phi + s\bar s \sin\phi$.
Calculated partial widths for the decays $\phi\to\gamma \eta$, $\gamma\eta'$,
$\gamma\pi^0$ are in a reasonable agreement with experiment. The measured value
of the branching ratio $BR(\phi\to\gamma f_0(980))$ requires $25^\circ\le
|\phi|\le 90^\circ$; for the decay $f_0(980)\to\gamma\gamma$ the agreement with
data is reached at either $77^\circ\le\phi\le 93^\circ$ or
$(-54^\circ)\le\phi\le (-38^\circ)$. Simultaneous analysis of the decays
$\phi(1020)\to\gamma f_0(980)$ and $f_0(980)\to\gamma\gamma$ provides arguments
in favour of the solution with negative mixing angle $\phi =-48^\circ\pm
6^\circ$.


title: Supersymmetric Triplet Higgs Model of Neutrino Masses and Leptogenesis

abstract:
  We construct a supersymmetric version of the triplet Higgs model for neutrino
masses, which can generate a baryon asymmetry of the Universe through
lepton-number violation and is consistent with the gravitino constraints.


title: The Center symmetry and its spontaneous breakdown at high temperatures

abstract:
  We examine the role of the center Z(N) of the gauge group SU(N) in gauge
theories. In this pedagogical article, we discuss, among other topics, the
center symmetry and confinement and deconfinement in gauge theories and
associated finite-temperature phase transitions. We also look at universal
properties of domain walls separating distinct confined and deconfined bulk
phases, including a description of how QCD color-flux strings can end on
color-neutral domain walls, and unusual finite-volume dependence in which
quarks in deconfined bulk phase seem to be "confined".


title: Quark Correlations Inside Hadrons And Single Diffraction

abstract:
  Hadron structure is considered in the frame of Strongly Correlated Quark
Model (SCQM). It is shown that quark correlations result in fluctuations of
hadronic matter distributions and single diffractive dissociation processes in
hadronic collisions, hard or soft, are manifestation of these fluctuations
inside colliding hadrons.


title: CP Violation for Leptons at Higher Energy Scales

abstract:
  The phase convention independent measure of CP violation for three
generations of leptons is evaluated at different energy scales. Unlike in the
quark sector, this quantity does not vary much between the weak and the grand
unification scales. The behavior of the measure of CP violation in the Standard
Model is found to be different from that in the extensions of the Standard
Model.


title: Neutralino Proton Cross Sections in SUGRA and D-BRANE Models

abstract:
  We calculate the spin independent neutralino-proton cross section for
universal SUGRA, non universal SUGRA and D-brane models with R-parity
invariance. The regions of maximum cross section in these models has started to
be probed by the current detectors. The minimum cross section generally is
>~1\times 10^{-(9-10)}pb and hence will be accessible in the future detectors,
barring special regions of parameter space where it can reduce to =~10^{-12}pb.
However, the squarks and gluinos will be heavy (>~1 TeV) in the latter case,
but still accessible at the LHC.


title: Allowable Low-Energy E_6 Subgroups from Leptogenesis

abstract:
  There are only two viable low-energy $E_6$ subgroups: $SU(3)_C \times SU(2)_L
\times U(1)_Y \times U(1)_N$ or $SU(3)_C \times SU(2)_L \times SU(2)'_R \times
U(1)_{Y_L + Y'_R}$, which would not erase any preexisting lepton asymmetry of
the Universe that may have been created by the decay of heavy singlet
(right-handed) neutrinos or any other mechanism. They are also the two most
favored $E_6$ subgroups from a recent analysis of present neutral-current data.
We study details of the leptogenesis, as well as some salient experimental
signatures of the two models.


title:
Non-Thermal Dark Matter, High Energy Cosmic Rays and Late-Decaying
  Particles From Inflationary Quantum Fluctuations

abstract:
  It has been suggested that the origin of cosmic rays above the GZK limit
might be explained by the decay of particles, X, with mass of the order of
10^{12} GeV. Generation of heavy particles from inflationary quantum
fluctuations is a prime candidate for the origin of the decaying X particles.
  It has also been suggested that the problem of non-singular galactic halos
might be explained if dark matter originates non-thermally from the decay of
particles, Y, such that there is a free-streaming length of the order of
0.1Mpc. Here we explore the possibility that quantum fluctuations might account
for the Y particles as well as the X particles. For the case of non-thermal
WIMP dark matter with unsuppressed weak interactions we find that there is a
general problem with deuterium photo-dissociation, disfavouring WIMP dark
matter candidates. For the case of more general dark matter particles, which
may have little or no interaction with conventional matter, we discuss the
conditions under which X and Y scalars or fermions can account for non-thermal
dark matter and cosmic rays. For the case where X and Y scalars are
simultaneously produced, we show that galactic halos are likely to have a
dynamically significant component of X scalar cold dark matter in addition to
the dominant non-thermal dark matter component.


title: New unitarity triangles of quark mixing and CP violation

abstract:
  Unitarity of the Cabibbo-Kobayashi-Maskawa matrix gives rise to nine new
unitarity triangles in the standard model.


title: Restricted flavor structure of soft SUSY breaking trilinear couplings

abstract:
  We analyze the flavor structure of the trilinear couplings in the different
theoretical models of SUSY breaking. We generically obtain A_{ij}= A^L_i +
A^R_j in all the models examined. In fact, this is the rigorous form when SUSY
breaking effects appear through the Kahler metric of chiral fields or through
wave-function renormalization. Indeed, the low-energy phenomenological
requirements from the absence of charge and color breaking minima and the
measurements in flavor changing neutral current (FCNC) observables strongly
favor this restricted form of the trilinear matrices. As a straightforward
consequence, the number of unknown parameters associated with the trilinear
couplings is decreased in a factor of 2.


title:
The Higgs sector in the minimal 3-3-1 model with the most general
  lepton-number conserving potential

abstract:
  The Higgs sector of the minimal 3 - 3 - 1 model with three triplets and one
sextet is investigated in detail under the most general lepton--number
conserving potential. The mass spectra and multiplet decompostion structure are
explicitly given in a systematic order and a transparent way allowing they to
be easily checked and used in further investigations. A previously arising
problem of inconsistent signs of f_{2} is also automatically solved.


title: The general QCD parametrization and the 1/N(c) expansion: A comparison

abstract:
  A comparison is presented of the two methods mentioned in the title for
treating hadron properties in QCD.While the general parametrization is derived
exactly from real QCD,the equivalence of the large N(c) description to real QCD
with 3 colors,is questionable.The reason why in some cases the large N(c)
method approximately works (while in others does not) is clarified.


title: Direct Extraction of QCD Lambda MS-bar from e+e- Jet Observables

abstract:
  We directly fit the QCD dimensional transmutation parameter, Lambda MS-bar,
to experimental data on e+e- jet observables, making use of next-to-leading
order (NLO) perturbative calculations. In this procedure there is no need to
mention, let alone to arbitrarily vary, the unphysical renormalisation scale
mu, and one avoids the spurious and meaningless ``theoretical error''
associated with standard alpha_s determinations. PETRA, SLD, and LEP data are
considered in the analysis. An attempt is made to estimate the importance of
uncalculated next-NLO and higher order perturbative corrections, and power
corrections, by studying the scatter in the values of Lambda MS-bar obtained
for different observables.


title: Parton distributions in the chiral quark model: a continuum computation

abstract:
  We compute the parton distributions for the chiral quark model. We present a
new technique for performing such computations based on Green functions. This
approach avoids a discretization of the spectrum. It therefore does not need
any smoothing procedures.
  The results are similar to those of other groups, however the distributions
peak at smaller $x$.


title: Trilinear Neutral Gauge Boson Couplings

abstract:
  We study the CP even trilinear neutral gauge boson vertices at one-loop in
the context of the Standard Model and the Minimal Supersymmetric Standard
Model, assuming two of the vector bosons are on-shell. We also study the
changes in the form-factors when these two bosons are off-shell.


title: Unweighted event generation in hadronic WZ production at order(alpha_S)

abstract:
  We present an algorithm for unweighted event generation in the partonic
process pp -> WZ (j) with leptonic decays at next-to-leading order in alpha_S.
Monte Carlo programs for processes such as this frequently generate events with
negative weights in certain regions of phase space. For simulations of
experimental data one would like to have unweighted events only. We demonstrate
how the phase space from the matrix elements can be combined to achieve
unweighted event generation using a second stage Monte Carlo integration over a
volume of real emissions (jets). Observable quantities are kept fixed in the
laboratory frame throughout the integration. The algorithm is applicable to a
broader class of processes and is CPU intensive.


title: On importance of dark matter for LHC physics

abstract:
  I would like to attract attention of the LHC high-energy physics community to
non-accelerator, low-energy experiments, that are also very sensitive to new
physics. My example concerns search for supersymmetric dark matter particles.
It is shown that non-observation of the SUSY dark matter candidates with a
high-accuracy detector can exclude large domains of the MSSM parameter space
and, in particular, can make especially desirable collider search for light
SUSY charged Higgs boson.


title:
Are High Energy Heavy Ion Collisions similar to a Little Bang, or just a
  very nice Firework?

abstract:
  The talk is a brief overview of what we recently learned about excited
hadronic matter from heavy ion collisions. The central issue is that the
systems produced do exhibit macroscopic behavior, it flows and we start getting
some idea about its effective Equation of State (EoS). More specifically, we
concentrate on elliptic flow, from SPS to RHIC energies, as well as on particle
composition and fluctuations. Note that a pressure and the rate of fluctuation
relaxation (discussed at the end) are ultimately a measure of a collision rate
in the system we would like to understand.


title: The static PQCD potential with modified boundary conditions

abstract:
  We calculate the potential between two static quarks in QCD using modified
boundary conditions for the perturbative expansion. Through a change of the
Feynman iepsilon prescription we effectively add a "sea" of gluons to the
asymptotic states with energies below a given scale Lambda. We find that the
standard result for the static potential gets corrections of order Lambda^2/Q^2
both at small and large momentum transfers Q^2. After resummation of the
infrared sensitive corrections we find that the running coupling alpha_s(Q^2)
freezes in the infrared and that the exchanged gluon gets an effective
tachyonic mass. We verify that identical results are obtained in the Coulomb
and Feynman gauges.


title:
Possible candidate of the cold dark matter and mass origin discovered
  from the $\beta$ decay

abstract:
  This paper has been withdrawn by the author(s) since somebody do not agree
with my idea.


title:
Equilibrium and nonequilibrium properties associated with the chiral
  phase transition at finite density in the Gross-Neveu Model

abstract:
  We study the dynamics of the chiral phase transition at finite density in the
Gross-Neveu (GN) model in the leading order in large-N approximation. The phase
structure of the GN model in this approximation has the property that there is
a tricritical point at a fixed temperature and chemical potential separating
regions where the chiral transition is first order from that where it is second
order. We consider evolutions starting in local thermal and chemical
equilibrium in the massless unbroken phase for conditions pertaining to
traversing a first or second order phase transition. We assume boost invariant
kinematics and determine the evolution of the order parameter $\sigma$, the
energy density and pressure as well as the effective temperature, chemical
potential and interpolating number densities as a function of the proper time
$\tau$. We find that before the phase transition, the system behaves as if it
were an ideal fluid in local thermal equilibrium with equation of state
$p=\epsilon$. After the phase transition, the system quickly reaches its true
broken symmetry vacuum value for the fermion mass and for the energy density.
The single particle distribution functions for Fermions and anti-Fermions go
far out of equilibrium as soon as the plasma traverses the chiral phase
transition. We have also determined the spatial dependence of the "pion"
Green's function $<\bar{\psi}(x) \gamma_5 \psi(x) \bar{\psi}(0) \gamma_5
\psi(0)>$ as a function of the proper time.


title: The Drell-Hearn Sum Rule at Order Alpha**3

abstract:
  The Drell-Hearn-Gerasimov-Iddings (DHGI) sum rule for electrons is evaluated
at order $\alpha^3$ and shown to agree with the Schwinger contribution to the
anomalous magnetic moment.