title: Studies of parton distributions at a neutrino factory

abstract:
  The determination of parton distribution functions in the nucleon and nuclei
is important for obtaining precise hadron-reaction cross sections, from which
any new exotic signature could be found. We show that a future neutrino factory
could provide important information on the parton distributions. First, a
recent effort concerning the parametrization of nuclear parton distributions is
explained. It suggests that the factory should be important for determining
unknown behavior of valence-quark distributions in nuclei at small $x$. Second,
the facility could be used for understanding nucleon spin structure and isospin
violation in the parton distributions.


title:
Unitarity constraints and role of geometrical effects in deep-inelastic
  scattering and vector-meson electroproduction

abstract:
  Deep-inelastic scattering at low Bjorken x and elastic vector meson
electroproduction are analyzed on the basis of the off-shell s-channel
unitarity. We discuss behavior of the total cross-section of virtual
photon-proton scattering and obtain, in particular, that the exponent in the
power-like dependence of $\sigma^{tot}_{\gamma^* p}$ is related to the
interaction radius of a constituent quark. The explicit mass dependence of the
exponent in the power energy behavior of the vector meson electroproduction has
been obtained. Angular distributions at large momentum transfers are
considered. The energy dependence of the total cross-section of
$\gamma^*\gamma^*$-interactions is also obtained.


title: Manifestations of Extra Dimensions in a Neutrino Telescope

abstract:
  Theories with large extra dimensions provide the possibility that a flavor
neutrino, localized in a 3+1 brane, can mix with a singlet neutrino living in
the bulk. This mixing leads to unconventional patterns of neutrino matter
oscillations and we examine in details how these oscillations depend upon two
parameters: the brane-bulk coupling $\xi$ and the effective mass $\mu$ of the
flavor neutrino inside matter. We find that high energy $(E \ge 50$ GeV)
$\nu_\mu$ neutrinos, to be detected by neutrino telescopes, can give signals of
extra dimensions. With a 1 k$m^{3}$ neutrino telescope extra dimensions with
radius down to $1\mu m$ can be tested directly, while for smaller radius an
indirect evidence can be established.


title:
Testing the Wigner - Weisskopf approximation by using neutral-meson -
  antimeson correlated states

abstract:
  We phenomenologically decompose the Weisskopf--Wigner approximation, as
applied to the neutral flavoured meson complexes, into three pieces and propose
tests for these pieces. Our tests hold for general decay amplitudes and
$M^0$--$\bar M^0$ mixing parameters. We concentrate on C-odd $M^0 \bar M^0$
states and stress the importance of such tests in view of the variety of
physics extracted from measurements on such complexes. Studying the feasibility
of the tests confines one to the $K^0 \bar K^0$ system at present. In
particular, we show that the time dependence of the correlated decay $\phi \to
K^0 \bar K^0 \to 2 (\pi^+ \pi^-)$ is determined solely by the WWA and provides
thus a clean test of it.


title: g_{rho sigma gamma} coupling constant in light cone QCD

abstract:
  The coupling constant g_{rho sigma gamma} is determined from light cone QCD
sum rules. A comparison of our result with the ones existing in literature is
presented.


title: Operator product expansion and confinement

abstract:
  Operator product expansion technique is analyzed in abelian and nonabelian
nonsupersymmetric field theoretical models with confinement. Special attention
is paid to the regimes where nonzero virtuality of vacuum fields is felt by
external currents. It is stressed that despite physics of confinement is
sometimes considered as being caused by "soft" vacuum gluon fields, it can
exhibit pronounced "hard" effects in OPE both in coordinate and momentum
spaces.


title: Mass Terms in Effective Theories of High Density Quark Matter

abstract:
  We study the structure of mass terms in the effective theory for
quasi-particles in QCD at high baryon density. To next-to-leading order in the
$1/p_F$ expansion we find two types of mass terms, chirality conserving
two-fermion operators and chirality violating four-fermion operators. In the
effective chiral theory for Goldstone modes in the color-flavor-locked (CFL)
phase the former terms correspond to effective chemical potentials, while the
latter lead to Lorentz invariant mass terms. We compute the masses of Goldstone
bosons in the CFL phase, confirming earlier results by Son and Stephanov as
well as Bedaque and Sch\"afer. We show that to leading order in the coupling
constant $g$ there is no anti-particle gap contribution to the mass of
Goldstone modes, and that our results are independent of the choice of gauge.


title:
On the Optimum Long Baseline for the Next Generation Neutrino
  Oscillation Experiments

abstract:
  For high energy long baseline neutrino oscillation experiments, we propose a
Figure of Merit criterion to compare the statistical quality of experiments at
various oscillation distances under the condition of identical detectors and a
given neutrino beam. We take into account all possible experimental errors
under general consideration. In this way the Figure of Merit is closely related
to the usual statistical criterion of number of sigmas. We use a realistic
neutrino beam for an entry level neutrino factory and a possible superbeam from
a meson source and a 100 kt detector for the calculation. We considered in
detail four oscillation distances, 300 km, 700 km, 2100 km and 3000 km, in the
neutrino energy range of 0.5-20 GeV for a 20 GeV entry level neutrino factory
and a 50 GeV superbeam. We found that the very long baselines of 2100 km and
3000 km are preferred for the neutrino factory according to the figure of merit
criterion. Our results also show that, for a neutrino factory, lower primary
muon energies such as 20 GeV are preferred rather than higher ones such as 30
or 50 GeV. For the superbeam, the combination of a long baseline such as 300 km
and a very long baseline like 2100 km will form a complete measurement of the
oscillation parameters besides the CP phase. To measure the CP phase in a
superbeam, a larger detector (a factor 3 beyond what is considered in this
article) and/or a higher intensity beam will be needed to put some significant
constraints on the size of the CP angle.


title: Charmonium decays: J/psi --> e+e- and eta_c --> gamma gamma

abstract:
  We compute the O(alpha_s^2) correction to the decay rate eta_c --> gamma
gamma and discuss its implications for precision quarkonium physics. We study
the suitability of the ratio Gamma(J/psi --> e+e-)/Gamma(eta_c --> gamma
gamma), in which the non-perturbative or soft effects cancel at
O(alpha_s^{0,1}), for extracting fundamental parameters of QCD at low energies.
We show that the QCD-based theory of charmonia is not capable of predicting
this ratio with any degree of confidence.


title:
Exclusive Decay of $1^{--}$ Quarkonia and $B_c$ Meson into a Lepton Pair
  Combined with Two Pions

abstract:
  We study the exclusive decay of $J/\Psi$, $\Upsilon$ and $B_c$ into a lepton
pair combined with two pions in the two kinematic regions. One is specified by
the two pions having large momenta, but a small invariant mass. The other is
specified by the two pions having small momenta. In both cases we find that in
the heavy quark limit the decay amplitude takes a factorized form, in which the
nonperturbative effect related to heavy meson is represented by a NRQCD matrix
element. The nonperturbative effects related to the two pions are represented
by some universal functions characterizing the conversion of gluons into the
pions. Using models for these universal functions and chiral perturbative
theory we are able to obtain numerical predictions for the decay widths. Our
numerical results show that the decay of $\jpsi$ is at order of $10^{-5}$ with
reasonable cuts and can be observed at BES II and the proposed BES III and
CLEO-C. For other decays the branching ratio may be too small to be measured.


title:
Meson-meson scattering within one loop Chiral Perturbation Theory and
  its unitarization

abstract:
  We present the complete one-loop calculation of all the two meson scattering
amplitudes within the framework of SU(3) Chiral Perturbation Theory, which
includes pions, kaons and the eta. In addition, we have unitarized these
amplitudes with the coupled channel Inverse Amplitude Method, which ensures
simultaneously the good low energy properties of Chiral Perturbation Theory and
unitarity. We show how this method provides a remarkable description of
meson-meson scattering data up to 1.2 GeV including the scattering lengths and
the generation of seven light resonances, which is consistent with previous
determination of the chiral parameters. Particular attention is paid to discuss
the differences and similarities of this work with previous analysis in the
literature.


title: Neutrino opacity in magnetised hot and dense nuclear matter

abstract:
  We study the neutrino interaction rates in hot matter at high densities in
the presence of uniform magnetic field. The neutrino cross-sections involving
both the charged current absorption and neutral current scattering reactions on
baryons and leptons have been considered. We have in particular considered the
interesting case when the magnetic field is strong enough to completely
polarise the protons and electrons in supernovae and neutron stars. The opacity
in such a situation is considerably modified and the cross-section develops
anisotropy. This has implications for phenomenon invoked in the literature to
explain the observed pulsar kicks.


title: Complete electroweak matching for radiative B decays

abstract:
  We compute the complete two-loop O(alpha) Wilson coefficients relevant for
radiative decays of the B meson in the SM. This is a necessary step in the
calculation of the O(alpha alpha_s^n ln^n m_b/M_W) corrections and improves on
our previous analysis of electroweak effects in B -> X_s gamma. We describe in
detail several interesting technical aspects of the calculation and include all
dominant QED matrix elements. In our final result, we neglect only terms
originated from the unknown O(alpha alpha_s) evolution of the Wilson
coefficients and some suppressed two-loop matrix elements. Due to the
compensation among different effects, we find that non-trivial electroweak
corrections decrease the branching ratio by about 3.6% for a light Higgs boson,
very close to our previous result. The corresponding up-to-date SM prediction
for the branching ratio with E_gamma > 1.6 GeV is (3.61 +- 0.30) x 10^-4.


title: Single top production at the LHC: the Effective-W Approximation

abstract:
  Motivated by the need to set bounds on the third generation charged
couplings, we study the mechanism of single top production at the LHC,
analyzing the sensitivity of different observables to the magnitude of the
effective left and right couplings. The study is carried out in the framework
of the so-called effective W approximation, where the virtual $W$ is treated as
a parton. We take this opportunity to critically assess the validity of this
approximation in detail by comparing it to an exact calculation recently
completed by us of the same process. We comment on several issues related to
top polarization since the observables relevant to distinguish between left and
right effective couplings involve the measurement of the spin of the top. The
conclusion is that the effective $W$ approximation is not well suited for this
subtle analysis; it fails to reproduce the detailed $p_T$ distributions and
grossly distorts the polarization of the emerging top. It does however,
reproduce the overall angular distribution and gives a sensible
order-of-magnitude estimate for the total cross section analysis.


title: The cross-section of muon-nuclear inelastic interaction

abstract:
  It is shown that the combination of the structure functions $F_2$ predicted
by the CKMT model at low and moderate values of $Q^2$ and MRS99 parton
distribution functions at high $Q^2$ gives a good description of the data over
complete measured region of $x$ and $Q^2$. Using these structure functions the
main characteristics of the muon-nucleus inelastic scattering are calculated.
Nuclear effects and contributions of the neutral current and $\gamma - Z$
interference are taken into account.


title: Three Loop Estimate of the Inclusive Semileptonic $b\to c$ Decay Rate

abstract:
  The renormalization-scale ($\mu$) dependence of the two-loop inclusive
semileptonic $b\to c\ell^-\bar\nu_\ell$ decay rate is shown to be significant
in the pole mass scheme, and the decay rate is shown to be poorly convergent in
the MS-bar scheme. Three-loop contributions to the decay rate are estimated by
developing Pade approximant techniques particularly suited to perturbative
calculations in the pole mass scheme. An optimized Pade estimate of the
three-loop contributions is obtained by comparison of the Pade estimates with
the three-loop terms determined by renormalization-group invariance. The
resulting three-loop estimate in the pole-mass scheme exhibits minimal
sensitivity to the renormalization scale near $\mu=1.0 GeV$, leading to an
estimated decay rate of $192\pi^3\Gamma(b\to
c\ell^-\bar\nu_\ell)/(G_F^2|V_{cb}|^2)=992\pm 217 GeV^5$ inclusive of
theoretical uncertainties and non-perturbative effects.


title:
Electroweak radiative corrections to W-boson production at hadron
  colliders

abstract:
  The complete set of electroweak O(alpha) corrections to the Drell--Yan-like
production of W bosons is calculated and compared to an approximation provided
by the leading term of an expansion about the W-resonance pole. All relevant
formulae are listed explicitly, and particular attention is paid to issues of
gauge invariance and the instability of the W bosons. A detailed discussion of
numerical results underlines the phenomenological importance of the electroweak
corrections to W-boson production at the Tevatron and at the LHC. While the
pole expansion yields a good description of resonance observables, it is not
sufficient for the high-energy tail of transverse-momentum distributions,
relevant for new-physics searches.


title: Infrared Dynamics in Vector-Like Gauge Theories: QCD and Beyond

abstract:
  Pade-approximant methods are used to extract information about leading
positive zeros or poles of QCD and SQCD beta-functions from the known terms of
their perturbative series. For QCD, such methods are seen to corroborate the
flavour-threshold behaviour obtained via lattice approaches for the occurrence
of infrared-stable fixed points.All possible Pade-approximant versions of the
known (one- to four-loop) terms of the QCD MS-bar beta-function series are
consistent with this threshold occurring at or above n_f = 6. This conclusion
continues to be true even if higher-degree Pade-approximants are introduced to
accommodate an arbitrary five-loop contribution to the QCD beta-function for a
given number of flavours.


title: Photon Emission from Ultrarelativistic Plasmas

abstract:
  The emission rate of photons from a hot, weakly coupled ultrarelativistic
plasma is analyzed. Leading-log results, reflecting the sensitivity of the
emission rate to scattering events with momentum transfers from $gT$ to $T$,
have previously been obtained. But a complete leading-order treatment requires
including collinearly enhanced, inelastic processes such as bremsstrahlung.
These inelastic processes receive O(1) modifications from multiple scattering
during the photon emission process, which limits the coherence length of the
emitted radiation (the Landau-Pomeranchuk-Migdal effect). We perform a
diagrammatic analysis to identify, and sum, all leading-order contributions. We
find that the leading-order photon emission rate is not sensitive to
non-perturbative $g^2 T$ scale dynamics. We derive an integral equation for the
photon emission rate which is very similar to the result of Migdal in his
original discussion of the LPM effect. The accurate solution of this integral
equation for specific theories of interest will be reported in a companion
paper.


title: Electron as Spatiotemporal Complexity due to Self-Organized Criticality

abstract:
  The electron, which has been pictured as an elementary particle ever since
J.J. Thomson's e/m-measurement in 1897, and the relativistic motion of which is
described by the Dirac equation, is discussed in the light of the recent
progress made in Science of Complex Systems. Theoretical arguments and
experimental evidences are presented which show that such an electron exhibits
characteristic properties of spatiotemporal complexities due to Self-Organized
Criticality (SOC). This implies in particular that, conceptually and logically,
it is neither possible nor meaningful to identify such an object with an
ordinary particle, which by definition is something that has a fixed mass
(size), a fixed lifetime, and a fixed structure.


title: QCD corrections to Associated t-tbar-H production at the Tevatron

abstract:
  We present in detail the calculation of the O(alpha_s^3)inclusive total cross
section for the process (p pbar-> t tbar h) in the Standard Model, at the
Tevatron center-of-mass energy sqrt(s_H)=2 TeV. The next-to-leading order QCD
corrections significantly reduce the renormalization and factorization scale
dependence of the Born cross section. They slightly decrease or increase the
Born cross section depending on the values of the renormalization and
factorization scales


title: Recent Status of Neutrino Oscillation Study

abstract:
  I review briefly the recent status of research on neutrino oscillations, such
as three and four flavor analysis of atmospheric neutrinos and solar neutrinos,
and prospects of present and future long baseline experiments.


title: Generic User Process Interface for Event Generators

abstract:
  Generic Fortran common blocks are presented for use by High Energy Physics
event generators for the transfer of event configurations from parton level
generators to showering and hadronization event generators.


title: Complete analysis of spin structure function g1 of He-3

abstract:
  We present a comprehensive analysis of the nuclear effects important in DIS
on polarized He-3 over a wide range of Bjorken x, 10^{-4} \leq x \leq 0.8.
Effects relevant for the extraction of the neutron spin structure function,
g1^n, from the He-3 data are emphasized.


title: Approximate calculation of corrections at NLO and NNLO

abstract:
  For processes involving structure functions and/or fragmentation functions,
arguments that there is a part that dominates the NLO corrections are briefly
reviewed. The arguments are tested against more recent NLO and in particular
NNLO calculations.


title:
Signals of neutralinos and charginos from gauge boson fusion at the CERN
  Large Hadron Collider

abstract:
  We point out that interesting signals of the non-strongly interacting sector
of the supersymmetric standard model arise from the production of charginos and
neutralinos via vector boson fusion (VBF) at the Large Hadron Collider (LHC).
In particular, if R-parity is violated, the hadronically quiet signals of
charginos and neutralinos through direct production get considerably
suppressed. We show that in such cases, the VBF channel can be useful in
identifying this sector through clean and background-free final states.


title: On Theoretical Uncertainties of the W Boson Mass Measurement at LEP2

abstract:
  We discuss theoretical uncertainties of the measurement of the $W$ boson mass
at LEP2 energies, reconstructed with the help of the tandem of the Monte Carlo
event generators KoralW and YFSWW3. Exploiting numerical results obtained with
these programs, and the existing knowledge in the literature, we estimate that
the theoretical uncertainty of the $W$ mass due to electroweak corrections, as
reconstructed at LEP2 with the help of these programs, is $\sim 5 $MeV. Since
we use certain idealized event selections and a simple $M_W$-fitting procedure,
our numerical exercises can be (should be) repeated for the actual ``$M_W$
extraction methods'' of the LEP2 measurements, using KoralW and YFSWW3 or other
Monte Carlo programs.


title:
Self-Tuning and de Sitter Brane Intersections in the 6-Dimensional Brane
  Models

abstract:
  We study the self-tuning of general brane junctions and brane networks on the
6-dimensional space-time. For the general brane junctions, there may exist one
fine-tuning among the brane tensions. For the brane networks, similar to the
5-dimensional self-tuning brane models, the brane tensions can be set
arbitrarily and there exists the singularity for the metric and bulk scalar.
And if we want to regularize the singularity, we will introduce the fine-tuning
among the brane tensions. In addition, because the 4-dimensional cosmological
constant we observe may be positive and very small, we discuss the brane
network with de Sitter brane intersections by introducing a bulk scalar.


title:
Unitarization of the complete meson-meson scattering at one loop in
  Chiral Perturbation Theory

abstract:
  We report on our one-loop calculation of all the two meson scattering
amplitudes within SU(3) Chiral Perturbation Theory, i.e. with pions, kaons and
etas. Once the amplitudes are unitarized with the coupled channel Inverse
Amplitude Method, they satisfy simultaneously the correct low-energy chiral
constraints and unitarity. We obtain a remarkable description of meson-meson
scattering data up to 1.2 GeV including the scattering lengths and seven light
resonances.


title: Leptonic Flavor and CP Violation

abstract:
  We discuss how neutrino oscillation experiments can probe new sources of
leptonic flavor and CP violation.


title: Assisted Inflation in Randall-Sundrum Scenario

abstract:
  We extend the Randall-Sundrum(RS) model by adding a fundamental scalar field
in the bulk, then study the multi-field assisted inflationary solution on
brane. We will show that this model satisfies not only the observation, but
also provides a solution to hierarchy problem. Furthermore in comparison with
the chaotic inflation model with a single field in four space-time dimension,
the parameters in our model required for a successful inflation are natural.


title:
The Inverse Amplitude Method in $\pi\pi$ Scattering in Chiral
  Perturbation Theory to Two Loops

abstract:
  The inverse amplitude method is used to unitarize the two loop $\pi\pi$
scattering amplitudes of SU(2) Chiral Perturbation Theory in the $I=0,J=0$,
$I=1,J=1$ and $I=2,J=0$ channels. An error analysis in terms of the low energy
one-loop parameters $\bar l_{1,2,3,4,}$ and existing experimental data is
undertaken. A comparison to standard resonance saturation values for the two
loop coefficients $\bar b_{1,2,3,4,5,6} $ is also carried out. Crossing
violations are quantified and the convergence of the expansion is discussed.


title: Two-Loop Amplitudes for Gluon Fusion into Two Photons

abstract:
  We present the two-loop matrix elements for the scattering of two gluons into
two photons in QCD. These matrix elements will enter into improved estimates of
the QCD background to Higgs production at the LHC when the Higgs decays into
two photons. The photon mode is especially important if M_H < 140 GeV. We also
give the amplitudes for the crossed process, glue gamma to glue gamma.


title: QCD and QED Corrections to Light-by-Light Scattering

abstract:
  We present the QCD and QED corrections to the fermion-loop contributions to
light-by-light scattering, gamma gamma to gamma gamma, in the ultrarelativistic
limit where the kinematic invariants are much larger than the masses of the
charged fermions.


title: Large Gauged Q Balls

abstract:
  We study Q-balls associated with local U(1) symmetries. Such Q-balls are
expected to become unstable for large values of their charge because of the
repulsion mediated by the gauge force. We consider the possibility that the
repulsion is eliminated through the presence in the interior of the Q-ball of
fermions with charge opposite to that of the scalar condensate. Another
possibility is that two scalar condensates of opposite charge form in the
interior. We demonstrate that both these scenaria can lead to the existence of
classically stable, large, gauged Q-balls. We present numerical solutions, as
well as an analytical treatment of the ``thin-wall'' limit.


title: Perturbative expansions in QCD and analytic properties of alpha_s

abstract:
  It is shown that analytic properties of standard QCD perturbation theory
contradict known spectral properties,and contain in particular IR generated
ghost poles and cuts. As an outcome the rigorous background perturbation theory
is developed and its analytic properties are shown to be in agreement with
general requirements. In a limiting case of large Nc, when QCD amplitudes
contain only pole singularities, the strong coupling constant alpha_s(Q) is
shown to be also meromorfic function of external momenta.
  Some simple models and examples are given when nonperturbative beta function
and alpha_s(Q) can be written explicitly.
  General form of amplitudes at large Nc is given in the framework of
background perturbation theory and its correspondence with standard
perturbation theory at large momenta is demonstrated in the example of e^+e^-
annihilation. For time-like momenta the background coupling constant differs
drastically from the standard one but the background series averaged over
energy intervals has the same (AF) asymptotics at large momenta as in the
standard perturbation theory.


title: Standard Model Engineering with Intersecting Branes

abstract:
  I briefly describe the recent construction of the first specific string
D-brane models yielding just the SM massless fermion spectrum. One of the most
remarkable facts predicted by these constructions is that the global symmetries
of the SM like Baryon and Lepton numbers as well as the axial $U(1)_A$ are
gauged symmetries whose anomalies are cancelled by a Green-Schwarz mechanism
only in the case of three quark-lepton generations. Proton stability and the
Dirac nature of neutrino masses are thus a prediction of these theories. This
is work done in collaboration with Fernando Marchesano and Raul Rabadan.


title: Impact of bosonic decays on the search for t~_1 and b~_1 squarks

abstract:
  We show that the bosonic decays of the lighter top and bottom squarks, i.e.
t~_1 -> b~_1 + (H^+ or W^+) and b~_1 -> t~_1 + (H^- or W^-), can be dominant in
a wide range of the MSSM parameters. Compared to the fermionic decays, such as
t~_1 -> b + chargino_j, these bosonic decays can have significantly different
decay distributions. We also show that the effect of the supersymmetric QCD
running of the quark and squark parameters on the t~_1 and b~_1 decay branching
ratios is quite dramatic. These could have an important impact on the search
for t~_1 and b~_1 and the determination of the MSSM parameters at future
colliders.


title:
Determination of $\alpha_s$ and heavy quark masses from recent
  measurements of $R(s)$

abstract:
  In this paper we compare recent experimental data for the total cross section
$\sigma(e^+e^-\to{hadrons})$ with the up-to-date theoretical prediction of
perturbative QCD for those energies where perturbation theory is reliable. The
excellent agreement suggests the determination of the strong coupling
$\alpha_s$ from the measurements in the continuum. The precise data from the
charm threshold region, when combined with the recent evaluation of moments
with three loop accurracy, lead to a direct determination of the short distance
$\bar{\rm MS}$ charm quark mass. Our result for the strong coupling constant
$\alpha_s^{(4)}(5 {GeV})=0.235^{+0.047}_{-0.047}$ corresponds to
$\alpha_s^{(5)}(M_Z)=0.124^{+0.011}_{-0.014}$, for the charmed quark mass we
find $m_c(m_c)=1.304(27)$. Applying the same approach to the bottom quark we
obtain $m_b(m_b)=4.191(51)$ GeV. Whereas our result for $\alpha_s(M_Z)$ serves
as a useful cross check for other more precise determinations, our values for
the charm and bottom quark masses are more accurate than other recent analyses.


title: Quasi Stable Black Holes at the Large Hadron Collider

abstract:
  We adress the production of black holes at LHC and their time evolution in
space times with compactified space like extra dimensions. It is shown that
black holes with life times of hundred fm/c can be produced at LHC. The
possibility of quasi-stable remnants is discussed.


title:
The transversity function and double spin asymmetry in semi-inclusive
  DIS

abstract:
  We show that the spin asymmetry in semi-inclusive deep inelastic scattering
between a longitudinally polarized lepton beam and a transversely polarized
proton target is sensitive to the proton transversity function. The asymmetry,
which is twist 3, is estimated to be more than 10% under the most favourable
conditions. The experiment we suggest is feasible at facilities like DESY, CERN
and JLAB.


title: OCD factorization for the pion diffractive dissociation into two jets

abstract:
  We present main ideas and obtained results of our recent calculations of
Coulomb and QCD contribution to the pion diffractive dissociation into two
jets.


title:
Measurement of the Lifetime Difference of $B_d$ Mesons: Possible and
  Worthwhile?

abstract:
  We estimate the decay width difference $\Delta Gamma_d / \Gamma_d$ in the
$B_d$ system including $1/m_b$ contributions and next-to-leading order QCD
corrections, and find it to be around 0.3%. We explicitly show that the time
measurements of an untagged $B_d$ decaying to a single final state
isotropically can only be sensitive to quadratic terms in $\Delta Gamma_d /
\Gamma_d$, and hence the use of at least two different final states is desired.
We discuss such pairs of candidate decay channels for the final states and
explore the feasibility of a $\Delta Gamma_d / \Gamma_d$ measurement through
them. The measurement of this width difference is essential for an accurate
measurement of $\sin(2\beta)$ at the LHC. The nonzero width difference may also
be used to identify new physics effects and to resolve a twofold discrete
ambiguity in the $B_d$-$\bar{B}_d$ mixing phase. We also derive an upper bound
on the value of $\Delta Gamma_d / \Gamma_d$ in the presence of new physics, and
point out some differences in the phenomenology of width differences in the
$B_s$ and $B_d$ systems.


title: CP-violation in the heavy quark systems

abstract:
  We present a review of general picture in the sector of electroweak symmetry
breaking with the CP-violation in the heavy quark interactions.


title: CP Violation - A New Era

abstract:
  We give a pedagogical review of the theory of CP violation with emphasis on
the implications of recent experimental results. The review includes: (i) A
detailed description of how CP violation arises in the Standard Model and in
its extension that allows for neutrino masses; (ii) The formalism of CP
violation in meson decays and its application to various K decays (\epsilon_K,
\epsilon^\prime and K\to\pi\nu\nu), D decays (D\to K\pi and D\to KK) and B
decays (B\to\ell\nu X, B\to\psi K_S and B\to\pi\pi, including a discussion of
the `penguin pollution' problem); (iii) Supersymmetry: the CP problems and the
use of CP violation as a probe of the mechanism of dynamical supersymmetry
breaking.


title: Direct CP Asymmetry of B -> X_d,s \gamma in a model with Vector quarks

abstract:
  We investigate the effect of vector quarks on the inclusive decays B -> X_d,s
\gamma. We show that the branching ratio of B -> X_d \gamma can differ sizably
from the SM and MSSM predictions, being enhanced to present experimental
observability or suppressed such that present runs of the B factories would not
observe it. Current measurements of the direct CP asymmetry (A_CP) for B -> X_s
\gamma are sensitive to the contribution from B -> X_d \gamma. For a
sufficiently enhanced BR(B -> X_d \gamma) we show that the dominant
contribution to the combined asymmetry may be from B -> X_d \gamma. Thus any
large value for A_CP should not immediately be attributed to B -> X_s \gamma,
which stresses the importance of good K/pi separation.


title: Summary of the Structure Function Session at Dis01

abstract:
  The status and ongoing developments in the field of deep inelastic scattering
presented at the DIS01 workshop in Bologna are discussed from both the
experimental and the theoretical perspective.


title: Testing perturbation theory on the nf=0 static quark potential

abstract:
  The perturbative expansion of static force and potential is reanalyzed
concerning its practical applicability. A well behaved perturbative prediction
is given by the integration of the renormalization group equation for the
coupling $\alpha_{qq}(\mu=1/r)=(C_f)^{-1} r^2 F(r)$. Since the Lambda-parameter
of the $\nf=0$ theory is known from previous work, the perturbative prediction
contains no free parameter. It is confronted with recent non-perturbative
results. For $\alpha < 0.3$ where the truncation error of the perturbative
expression is naively estimated to be moderate, it is really quite accurate and
large ``non-perturbative terms'' are excluded.


title: Discovery potential for New Physics in view of the RHIC-Spin upgrade

abstract:
  In view of a possible upgrade of the RHIC-Spin program at BNL, concerning
both the machine and the detectors, we give some predictions concerning the
potentialities of New Physics detection with polarized proton beams. We focus
on parity-violating asymmetries in one-jet production due to contact terms or
to a new leptophobic neutral gauge boson. We comment on the main uncertainties
and we compare with unpolarized searches at Tevatron.


title:
Color-Flavor Unlocking and Phase Diagram with Self-Consistently
  Determined Strange Quark Masses

abstract:
  The phase diagram of strongly interacting matter at non-zero temperature and
baryon chemical potential is calculated within a 3-flavor NJL-type quark model
with realistic quark masses. The model exhibits spontaneous chiral symmetry
breaking as well as diquark condensation in the two-flavor
color-superconducting phase and in the color-flavor locked phase. We
investigate the color-flavor unlocking phase transition, taking into account
self-consistently calculated effective quark masses. We find that it is mainly
triggered by a first order phase transition with respect to the strange quark
mass. It takes place at much higher values of the chemical potential than the
transition to the hadronic phase such that we find a relatively large region in
the phase diagram where the two-flavor color-superconductor seems to be the
most favored state.


title: Using Tau Polarization to Sharpen up the SUGRA Signal at Tevatron

abstract:
  The most promising source of SUGRA signal at the Tevatron collider is the
pair-production of electroweak gauginos, followed by their leptonic decay. In
the parameter range corresponding to dominant leptonic decay of these gauginos
one or more of the leptons are expected to be $\tau$ with $P_\tau \simeq +1$.
This polarization can be effectively used to distinguish the signal from the
background in the 1-prong hadronic decay channel of $\tau$ by looking at the
fractional $\tau$-jet momentum carried by the charged prong.


title: Beautiful Mirrors and Precision Electroweak Data

abstract:
  The Standard Model (SM) with a light Higgs boson provides a very good
description of the precision electroweak observable data coming from the LEP,
SLD and Tevatron experiments. Most of the observables, with the notable
exception of the forward-backward asymmetry of the bottom quark, point towards
a Higgs mass far below its current experimental bound. The disagreement, within
the SM, between the values for the weak mixing angle as obtained from the
measurement of the leptonic and hadronic asymmetries at lepton colliders, may
be taken to indicate new physics contributions to the precision electroweak
observables. In this article we investigate the possibility that the inclusion
of additional bottom-like quarks could help resolve this discrepancy. Two
inequivalent assignments for these new quarks are analysed. The resultant fits
to the electroweak data show a significant improvement when compared to that
obtained in the SM. While in one of the examples analyzed, the exotic quarks
are predicted to be light, with masses below 300 GeV, and the Higgs tends to be
heavy, in the second one the Higgs is predicted to be light, with a mass below
250 GeV, while the quarks tend to be heavy, with masses of about 800 GeV. The
collider signatures associated with the new exotic quarks, as well as the
question of unification of couplings within these models and a possible
cosmological implication of the new physical degrees of freedom at the weak
scale are also discussed.


title: Analysis of D_s-> phi pi beyond naive factorization

abstract:
  We analyze the decay $D_s\to \phi \pi$ with QCD factorization in the heavy
quark limit. The nonfactorizable contributions, including hard spectator
contribution are discussed and numerical results are presented. Our predictions
on the branching ratio of the decay are in agreement with the experiment. We
also use a pure phenomenological method to estimate the branching ratio for
$D_s\to \phi\pi$ with the existed $D^0\to K^{*}\pi$ data.


title: Spin rotation and oscillation of high energy particles in storage ring

abstract:
  Phenomena of rotation and oscillations of particle spin are discussed for
particles rotating in storage ring. The fact that these effects are described
by spin-dependent part of zero-angle scattering amplitude allows to use them
for the measurement of this amplitude at different energies of colliding
particles. It is shown that effect magnitudes are large and they can be
observed at the existing accelerators.


title: A simple way to generate high order vacuum graphs

abstract:
  We describe an efficient practical procedure for enumerating and regrouping
vacuum Feynman graphs of a given order in perturbation theory. The method is
based on a combination of Schwinger-Dyson equations and the
two-particle-irreducible ("skeleton") expansion. The regrouping leads to
skeletons containing only free propagators, together with "ring diagrams"
containing all the self-energy insertions. As a consequence, relatively few
diagrams need to be drawn and integrations carried out at any single stage of
the computation and, in low dimensions, overlapping ultraviolet/infrared
subdivergences can be cleanly isolated. As an illustration we enumerate the
graphs contributing to the 4-loop free energy in QCD, explicitly in a continuum
and more compactly in a lattice regularization.


title: Non-factorizable effects on $\Bbar^0\to D^{(*)0}\pi^0$

abstract:
  Non-factorizable effects on the color-suppressed $B\to D^{(*)}\pi$ decay
modes are analyzed. Recent observations of $\Bbar^0\to D^{(*)0}\pi^0$ by Belle
and CLEO strongly suggest that there exists a non-zero strong phase difference
between color-allowed and color-suppressed decay modes, and the factorization
parameter $a_2$ associated with the color-suppressed decay mode is process
dependent. In the heavy quark limit where $b$ and $c$ are heavy, the process
dependence of $a_2(D\pi,D^*\pi)$ is due to the different configuration of the
heavy quark spin relative to the light degrees of freedom. From the
experimental data, the heavy quark spin symmetry breaking contributions to the
non-fatorizable effects are estimated to be $23-28%$.


title: The CCFM Monte Carlo generator CASCADE

abstract:
  CASCADE is a full hadron level Monte Carlo event generator for e-p, gamma-p
and p-p_bar processes, which uses the CCFM evolution equation for the initial
state cascade in a backward evolution approach supplemented with off-shell
matrix elements for the hard scattering. A detailed program description is
given, with emphasis on parameters the user wants to change and common block
variables which completely specify the generated events.


title:
$O(\alpha_s)$ Corrections to $b \bar b \to W^{\pm}H^{\mp}$ at the CERN
  Large Hadron Collider

abstract:
  The $O(\alpha_{s})$ corrections to the cross section for $b \bar b \to
W^{\pm}H^{\mp}$ at the LHC are calculated in the minimal supersymmetric
standard model (MSSM) in the $\bar{MS}$ and OS (on-mass-shell) renormalization
schemes. The results in two schemes are in good agreement. In the $\bar{MS}$
scheme, the QCD corrections are negative and within $ -14% \sim -20%$ for
charged Higgs mass up to 1 TeV and $\tan\beta >15$. For $\tan\beta =2$, the
magnitude of the QCD corrections can be greater than 30%.


title: Consistent Treatment of Soft and Hard Processes in Hadronic Interactions

abstract:
  The QCD improved parton model is a very successful concept to treat processes
in hadronic interactions, whenever large partonic transverse momenta are
involved. However, cross sections diverge in the limit p_T -> 0, and the usual
treatment is the definition of a lower cutoff p_T_min, such that processes with
a smaller p_T -- so-called soft processes -- are simply ignored, which is
certainly not correct for example at RHIC energies. A more consistent procedure
amounts to introduce a technical parameter Q_0^2, referred to as soft
virtuality scale, which is nothing but an artificial borderline between soft
and hard physics. We will discuss such a formalism, which coincides with the
improved parton model for high p_T processes and with the phenomenological
treatment of soft scattering, when only small virtualities are involved. The
most important aspect of our approach is that it allows to obtain a smooth
transition between soft and hard scattering, and therefore no artificial
dependence on a cutoff parameter should appear.


title:
Positronium Hyperfine Splitting in Non-commutative Space at the Order
  $\alpha^6$

abstract:
  We obtain positronium Hyperfine Splitting owing to the non-commutativity of
space and show that, in the leading order, it is proportional to $\theta
\alpha^6$ where, $\theta$ is the parameter of non-commutativity. It is also
shown that spatial non-commutativity splits the spacing between $n=2$ triplet
excited levels $E(2^3S_1)\to E(2^3P_2)$ which provides an experimental test on
the non-commutativity of space.


title: Black Hole Production by Cosmic Rays

abstract:
  Ultra-high energy cosmic rays create black holes in scenarios with extra
dimensions and TeV-scale gravity. In particular, cosmic neutrinos will produce
black holes deep in the atmosphere, initiating quasi-horizontal showers far
above the standard model rate. At the Auger Observatory, hundreds of black hole
events may be observed, providing evidence for extra dimensions and the first
opportunity for experimental study of microscopic black holes. If no black
holes are found, the fundamental Planck scale must be above 2 TeV for any
number of extra dimensions.


title:
Nonrelativistic spin 1/2 particle in an arbitrary non-Abelian magnetic
  field in two spatial dimensions

abstract:
  The (group and spin space) matrix Hamiltonian describing the dynamics of a
nonrelativistic spin 1/2 particle moving in a static, but spatially dependent,
non-Abelian magnetic field in two spatial dimensions is shown to take the form
of an anticommutator of a nilpotent operator and its hermitian conjugate.
Consequently, the (group space) matrix Hamiltonians for the two different spin
projections form partners of a supersymmetric quantum mechanical system. The
resulting supersymmetry algebra is exploited to explicitly construct the exact
zero energy ground state wavefunction(s) for the system. The remaining
eigenstates and eigenvalues of the two partner Hamiltonians form positive
energy degenerate pairs.


title:
Hydrodynamic scaling from the dynamics of relativistic quantum field
  theory

abstract:
  Hydrodynamic behavior is a general feature of interacting systems with many
degrees of freedom constrained by conservation laws. To date hydrodynamic
scaling in relativistic quantum systems has been observed in many high energy
settings, from cosmic ray detections to accelerators, with large particle
multiplicity final states. Here we show first evidence for the emergence of
hydrodynamic scaling in the dynamics of a relativistic quantum field theory. We
consider a simple scalar $\lambda \phi^4$ model in 1+1 dimensions in the
Hartree approximation and study the dynamics of two colliding kinks at
relativistic speeds as well as the decay of a localized high energy density
region. The evolution of the energy-momentum tensor determines the dynamical
local equation of state and allows the measurement of the speed of sound.
Hydrodynamic scaling emerges at high local energy densities.


title:
The anomalous chromomagnetic dipole moment of the top quark in the
  standard model and beyond

abstract:
  The anomalous chromomagnetic moment of the top quark arises from one loop
corrections to the vertex $\bar t t g$. We give explicit formulae for this
anomalous coupling in the framework of the standard model, the two Higgs
doublet model and the minimal supersymmetric standard model. We compare the
results for the anomalous coupling with the bound $-0.03 \leq \Delta \kappa
\leq 0.01$ emerging from the analysis of $b \to s \gamma$ process with an
on-shell bremsstrahlung gluon. This enables us to study the allowed region of
parameters of the models under consideration.


title: On-Mass-Shell Renormalization of Fermion Mixing Matrices

abstract:
  We consider favourable extensions of the standard model (SM) where the lepton
sector contains Majorana neutrinos with vanishing left-handed mass terms, thus
allowing for the see-saw mechanism to operate, and propose physical
on-mass-shell (OS) renormalization conditions for the lepton mixing matrices
that comply with ultraviolet finiteness, gauge-parameter independence, and
(pseudo)unitarity. A crucial feature is that the texture zero in the neutrino
mass matrix is preserved by renormalization, which is not automatically the
case for possible generalizations of existing renormalization prescriptions for
the Cabibbo-Kobayashi-Maskawa (CKM) quark mixing matrix in the SM. Our
renormalization prescription also applies to the special case of the SM and
leads to a physical OS definition of the renormalized CKM matrix.


title: Three Family N=1 SUSY Models from Z_n Orbifolded AdS/CFT

abstract:
  We present an analysis of compactifications of the type IIB superstring on
AdS_5 x S^5 / \Gamma, where \Gamma is an abelian cyclic group. Every \Gamma
=Z_n of order n<= 12 is considered. This results in 60 chiral models, and a
systematic analysis with n<8 yields four containing the minimal SUSY standard
model with three families. One of these models extends to an infinite sequence
of three-family MSSMs. We also give a lower bound on the number of chiral
models for all values of n.


title:
A New Approach to the Calculation of Some Properties of Vacuum and $\pi$
  and $\sigma$ Mesons

abstract:
  It is shown in a systematic way that the instanton dilute model can be
combined with the global colour symmetry model to form a new nonperturbative
QCD model. Based on the quark propagator derived in the instanton dilute liquid
approximation, the quark condensate $<\bar{q}q>$, the mixed quark gluon
condensate $g_{s}<\bar{q}G_{\mu\nu}\sigma^{\mu\nu}q>$, the four quark
condensate $<|bar{q}\Gamma q\bar{q}\Gamma q>$ and tensor, pion vacuum
susceptibilities have been calculated at the mean field level in the framework
of the new nonperturbative QCD model. The numerical results are compatible with
the values obtained within other nonperturbative approaches. The calculated
masses and decay constants of $\pi$ and $\sigma$ mesons are also close to the
experimental values.


title: Determination of <2pi_{I=2}|Q_{7,8}|K0> in the Chiral Limit

abstract:
  We reconsider the dispersive evaluation of the weak matrix elements
<2pi_{I=2}|Q_{7,8}|K0> in the chiral limit. The perturbative matching is
accomplished fully within the scheme dependence used in the two loop weak OPE
calculations. The effects of dimension eight (and higher dimension) operators
are fully accounted for. We perform a numerical determination of the weak
matrix elements using our dispersive sum rules fortified by constraints from
the classical chiral sum rules. A careful assessment of the attendant
uncertainties is given.


title: Parametrizations of Quark Confinement in Production Processes

abstract:
  Baryons are described as bound states of quarks and scalar as well as
axialvector diquarks. In order to effectively parametrize confinement several
{\it ansaetze} for the dressing functions of the constituent propagators are
used. The corresponding results for electromagnetic and strong form factors
differ only slightly. On the other hand observables from production processes
show the permissibility of different dressing functions.


title: Nonlinear Gluon Evolution in the Color Glass Condensate: II

abstract:
  We complete the construction of the renormalization group equation (RGE) for
the Color Glass Condenstate begun in Paper I. This is the equation which
governs the evolution with rapidity of the statistical weight function for the
color glass field. The coefficients in this equation --- one-loop real and
virtual contributions --- are computed explicitly, to all orders in the color
glass field. The resulting RGE can be interpreted as the imaginary-time
evolution equation, with rapidity as the ``imaginary time'', for a quantum
field theory in two spatial dimensions. In the weak field limit it reduces to
the BFKL equation. In the general non-linear case, it is equivalent to an
equation by Weigert which summarizes in functional form the evolution equations
for Wilson line operators previously derived by Balitsky and Kovchegov.


title: A note on the Georgi vector limit at finite temperature/density

abstract:
  The mechanism of chiral symmetry restoration in the context of the Georgi
Vector Limit (GVL) at finite temperature/density is discussed.
  It is suggested that, whereas the system may be driven to the GVL, the fact
of reaching the point of restoration does not neceserily mean the complete
realization of the GVL since the other mechanisms of restoration may contribute
at lower temperatures/densities.


title:
Renormalization group improvement of the NRQCD Lagrangian and heavy
  quarkonium spectrum

abstract:
  We complete the leading-log renormalization group scaling of the NRQCD
Lagrangian at $O(1/m^2)$. The next-to-next-to-leading-log renormalization group
scaling of the potential NRQCD Lagrangian (as far as the singlet is concerned)
is also obtained in the situation $m\alpha_s \gg \Lambda_{QCD}$. As a
by-product, we obtain the heavy quarkonium spectrum with the same accuracy in
the situation $m\alpha_s^2 \simg \Lambda_{QCD}$. When $\Lambda_{QCD} \ll
m\alpha_s^2$, this is equivalent to obtain the whole set of
$O(m\alpha_s^{(n+4)} \ln^n \alpha_s)$ terms in the heavy quarkonium spectrum.
The implications of our results in the non-perturbative situation $m\alpha_s
\sim \Lambda_{QCD}$ are also mentioned.


title: Intermediate Scale Supersymmetric Inflation, Matter and Dark Energy

abstract:
  We consider supersymmetric inflation models in which inflation occurs at an
intermediate scale and which provide a solution to the $\mu$ problem and the
strong CP problem. Such models are particularly attractive since inflation,
baryogenesis and the relic abundance of cold dark matter are all related by a
set of parameters which also affect particle physics collider phenomena,
neutrino masses and the strong CP problem. For such models the natural
situation is a universe containing matter composed of baryons, massive
neutrinos, lightest superpartner cold dark matter, and axions. The present day
relic abundances of these different forms of matter are (in principle)
calculable from the supersymmetric inflation model together with a measurement
of the CMB temperature and the Hubble constant. From these relic abundances one
can deduce the amount of the present day dark energy density.


title: Oscillations of neutrinos and mesons in quantum field theory

abstract:
  This report deals with the quantum field theory of particle oscillations in
vacuum. We first review the various controversies regarding quantum-mechanical
derivations of the oscillation formula, as well as the different
field-theoretical approaches proposed to settle them. We then clear up the
contradictions between the existing field-theoretical treatments by a thorough
study of the external wave packet model. In particular, we show that the latter
includes stationary models as a subcase. In addition, we explicitly compute
decoherence terms, which destroy interferences, in order to prove that the
coherence length can be increased without bound by more accurate energy
measurements. We show that decoherence originates not only in the width and in
the separation of wave packets, but also in their spreading through space-time.
In this review, we neither assume the relativistic limit nor the stability of
oscillating particles, so that the oscillation formula derived with
field-theoretical methods can be applied not only to neutrinos but also to
neutral K and B mesons. Finally, we discuss oscillations of correlated
particles in the same framework.


title: U(2)-like Flavor Symmetries and Approximate Bimaximal Neutrino Mixing

abstract:
  Models involving a U(2) flavor symmetry, or any of a number of its
non-Abelian discrete subgroups, can explain the observed hierarchy of charged
fermion masses and CKM angles. It is known that a large neutrino mixing angle
connecting second and third generation fields may arise via the seesaw
mechanism in these models, without a fine tuning of parameters. Here we show
that it is possible to obtain approximate bimaximal mixing in a class of models
with U(2)-like Yukawa textures. We find a minimal form for Dirac and Majorana
neutrino mass matrices that leads to two large mixing angles, and show that our
result can quantitatively explain atmospheric neutrino oscillations while
accommodating the favored, large angle MSW solution to the solar neutrino
problem. We demonstrate that these textures can arise in models by presenting a
number of explicit examples.


title: Brane Fluctuation and anomalous muon magnetic moment

abstract:
  We study the effects of extra dimensions on the muon anomalous magnetic
moment with brane fluctuation. Since the coupling is naturally suppressed if
brane fluctuation is considered by exponential softening factor for heavier
states, the contribution from the whole Kaluza-Klein graviton tower is shown to
be finite. The recent BNL E821 result is accomodated with $D=4+\delta$
dimensional gravitational scale, $M_D$, in the range of $M_D \simeq 1.0 - 5.1$
TeV ($\delta=2$), and $M_D \simeq 1.0 - 8.0 $ TeV ($\delta=6$) with the brane
tension parameter $f=(4\pi^2 \tau)^{1/4}$, in the range $f = 1 - 10 $ TeV.


title:
Perturbative QCD Potential, Renormalon Cancellation and Phenomenological
  Potentials

abstract:
  We examine the total energy E_tot(r) = 2 m_pole + V_QCD(r) of the b\bar b
system within perturbative QCD up to O(\alpha_S^3). We extend a previous
analysis by incorporating effects of the non-zero charm-quark mass in loops. We
find that, once the renormalon cancellation is performed, E_tot(r) agrees well
with typical phenomenological potentials for heavy quarkonia at distances 0.5
GeV^-1 ~< r ~< 3 GeV^-1. We also examine the perturbative predictions for
E_tot(r) of other heavy quarkonium systems. Whenever stable predictions are
obtained, they agree with each other up to an r-independent constant.


title: Nonequilibrium Chiral Dynamics and Effective Lagrangians

abstract:
  We review our recent work on Chiral Lagrangians out of thermal equilibrium,
which are introduced to analyse the pion gas formed after a Relativistic Heavy
Ion Collision. Chiral Perturbation Theory is extended by letting $\fpi$ be time
dependent and allows to describe explosive production of pions in parametric
resonance. This mechanism could be relevant if hadronization occurs at the
chiral phase transition.


title:
CP violation and matter effect in long-baseline neutrino oscillation in
  the four-neutrino model

abstract:
  We investigate the CP violation effect and the matter effect in the
long-baseline neutrino oscillations in the four-neutrino model with mass scheme
of the two pairs of two close masses separated by a gap of the order of 1 eV by
using the constraints on the mixing matrix derived from the solar neutrino
deficit, atmospheric neutrino anomaly, LSND experiments, and the other
terrestrial neutrino oscillation experiments. We also use the results of the
combined analyses by Gonzalez-Garcia, Maltoni, and Pe\~na-Garay of the
solutions to the solar and atmospheric neutrino problems with the recent SNO
solar neutrino data. For the solution of close-to-active solar neutrino
oscillations plus close-to-sterile atmospheric neutrino oscillations, the pure
CP violation part of the oscillation probability difference between the
CP-conjugate channels could attain as large as $0.10-0.25$ in the neutrino
energy range of $E = 6-15$ GeV at the baseline $L = 730$ km for
$\nu_\mu\to\nu_\tau$ oscillation, and the matter effect is at the $8-15%$ level
of the pure CP violation effect, while for the solution of near-pure-sterile
solar neutrino oscillations plus near-pure-active atmospheric neutrino
oscillations, the pure CP violation effect in $\Delta P(\nu_\mu\to\nu_\tau)$ is
very small $(\sim 0.01)$ and is comparable to the matter effect. For
$\nu_\mu\to\nu_e$ oscillation, the pure CP violation effect is independent of
the active-sterile admixture and is at most 0.05 in $E = 1.5-3$ GeV at $L =
290$ km and the matter effect is at the $15-30%$ level.


title: CP Violation in the Minimal Supersymmetric Seesaw Model

abstract:
  We study CP violation in the lepton sector of the supersymmetric extension of
the Standard Model with three generations of massive singlet neutrinos with
Yukawa couplings $Y_\nu$ to lepton doublets, in a minimal seesaw model for
light neutrino masses and mixing. This model contains six physical CP-violating
parameters, namely the phase $\delta$ observable in oscillations between light
neutrino species, two Majorana phases $\phi_{1,2}$ that affect $\beta \beta_{0
\nu}$ decays, and three independent phases appearing in
${Y_\nu}{Y_\nu}^\dagger$, that control the rate of leptogenesis.
Renormalization of the soft supersymmetry-breaking parameters induces
observable CP violation at low energies, including T-odd asymmetries in
polarized $\mu\to eee$ and $\tau \to \ell \ell \ell$ decays, as well as lepton
electric dipole moments. In the leading-logarithmic approximation in which the
massive singlet neutrinos are treated as degenerate, these low-energy
observables are sensitive via ${Y_\nu}^\dagger{Y_\nu}$ to just one combination
of the leptogenesis and light-neutrino phases. We present numerical results for
the T-odd asymmetry in polarized $\mu\to eee$ decay, which may be accessible to
experiment, but the lepton electric dipole moments are very small in this
approximation. To the extent that the massive singlet neutrinos are not
degenerate, low-energy observables become sensitive also to two other
combinations of leptogenesis and light-neutrino phases, in this minimal
supersymmetric seesaw model.


title: Scale-independent mixing angles

abstract:
  A radiatively-corrected mixing angle has to be independent of the choice of
renormalization scale to be a physical observable. At one-loop in MS-bar, this
only occurs for a particular value, p*, of the external momentum in the
two-point functions used to define the mixing angle: p*^2=(M1^2+M2^2)/2, where
M1, M2 are the physical masses of the two mixed particles. We examine two
important applications of this to the Minimal Supersymmetric Standard Model:
the mixing angle for a) neutral Higgs bosons and b) stops. We find that this
choice of external momentum improves the scale independence (and therefore
provides a more reliable determination) of these mixing angles.


title: Unconventional low-energy SUSY from warped geometry

abstract:
  Supersymmetric models with a warped fifth spatial dimension can solve the
hierarchy problem, avoiding some shortcomings of non-supersymmetric
constructions, and predict a plethora of new phenomena at typical scales Lambda
not far from the electroweak scale (Lambda ~ a few TeV). In this paper we
derive the low-energy effective theories of these models, valid at energies
below Lambda. We find that, in general, such effective theories can deviate
significantly from the Minimal Supersymmetric Standard Model (MSSM) or other
popular extensions of it, like the NMSSM: they have non-minimal Kaehler
potentials (even in the Mp -> \infty limit), and the radion is coupled to the
visible fields, both in the superpotential and the Kaehler potential, in a
non-trivial (and quite model-independent) fashion. The corresponding
phenomenology is pretty unconventional, in particular the electroweak breaking
occurs in a non-radiative way, with tan beta \simeq 1 as a quite robust
prediction, while the mass of the lightest Higgs boson can be as high as ~ 700
GeV.


title: Hyperfine structure in hydrogen and helium ion

abstract:
  QED theory of the hyperfine splitting of the $1s$ and $2s$ state in hydrogen
isotopes and helium-3 ion is considered. We develop an accurate theory of a
specific difference 8E_{HFS}(2s)-E_{HFS}(1s). We take into account fourth order
corrections and nuclear structure effects. The theoretical prediction is now of
a higher accuracy than the experiment is. The study of the difference provides
the most accurate test (on a level of a part in 10^8) of the QED theory of $1s$
HFS up to date. The theory agrees with most of the experimental data.


title: Proton structure function. Soft and hard Pomerons

abstract:
  Regge models for proton structure function with and without a hard Pomeron
contribution are compared with all available data in the region $W>3$ GeV,
$Q^{2}\leq 3000$ GeV$^{2}$ and $x<0.75$. It is shown that the data do not
support a hard Pomeron term in $\gamma^{*} p$ amplitude. Moreover, the data
support the idea that the soft Pomeron, either is a double pole with
$\alpha_{P}(0)=1$ in the angular momentum $j$-plane, or is a simple pole with
$\alpha_{P}(0)=1+\epsilon$ where $\epsilon \ll 1$.


title: New predictions for inclusive heavy-quarkonium P-wave decays

abstract:
  We show that some NRQCD colour-octet matrix elements can be written in terms
of (derivatives of) wave functions at the origin and non-perturbative universal
constants once the factorization between the soft and ultrasoft scale is
achieved by using an effective field theory where only ultrasoft degrees of
freedom are kept as dynamical entities. This allows us to derive a new set of
relations between inclusive heavy-quarkonium P-wave decays into light hadrons
with different principal quantum number and with different heavy flavour. In
particular, we can estimate the branching ratios of bottomonium P-wave states
by using charmonium data.


title:
A gobal fit to the anomalous magnetic moment, Higgs limit and b->s gamma
  in the constrained MSSM

abstract:
  New data on the anomalous magnetic moment of the muon together with the b->s
gamma decay rate and Higgs limits are considered within the supergravity
inspired constrained minimal supersymmetric model. We perform a global
statistical chi2 analysis of these data and show that the allowed region of
parameter space is bounded from below by the Higgs limit, which depends on the
trilinear coupling and from above by the anomalous magnetic moment.


title: Equation of state of strongly coupled QCD at finite density

abstract:
  Using an effective strongly coupled lattice QCD Hamiltonian and Wilson
fermions we calculate the equation of state for cold and dense quark matter by
constructing an ansatz which exactly diagonalizes the Hamiltonian to second
order in field operators for all densities. This ansatz obeys the free lattice
Dirac equation with a chemical potential term and a mass term which is
interpreted as the dynamical quark mass. We find that the order of chiral phase
transition depends on the values of input parameters. In the phase with
spontaneously broken chiral symmetry the quark Fermi sea has negative pressure
indicating its mechanical instability. This result is in qualitative agreement
with those obtained using continuum field theory models with four--point
interactions.


title: Antimatter Bounds by Anti-Asteroids annihilations on Planets and Sun

abstract:
  The existence of antimatter stars in the Galaxy as possible signature for
inflationary models with non-homogeneous baryo-synthesis may leave the trace by
antimatter cosmic rays as well as by their secondaries (anti-planets and
anti-meteorites) diffused bodies in our galactic halo. The anti-meteorite flux
may leave its explosive gamma signature by colliding on lunar soil as well as
on terrestrial, jovian and solar atmospheres. However the propagation in galaxy
and the consequent evaporation in galactic matter gas suppress the lightest (m
< 10^(-2)g) anti-meteorites. Anisotropic annihilation of larger anti-meteorites
within a narrow mass window, maybe rarely deflected, bounced by the galactic
gas disk, escaping detection in our solar system. Nevertheless heaviest
anti-meteorites (m > 10^(-1)g up to 10^(6)g) are unable to be deflected by the
thin galactic gas surface annihilation; they might hit the Sun (or rarely
Jupiter) leading to an explosive gamma event and a spectacular track with a
bouncing and even a propelling annihilation on cromosphere and photosphere.
Their anti-nuclei annihilation in pions and their final hard gammas showering
may be observabe as a "solar flare" at a rate nearly comparable to the observed
ones. From their absence we may infer bounds on antimatter-matter ratio near or
below 10^(-9) limit: already recorded data in BATSE catalog might be applied.


title: The Infrared Boundary of Perturbative QCD

abstract:
  Evidence is reviewed suggesting that QCD remains a perturbative theory with a
(relatively) small coupling constant down to a distinct infrared boundary on
perturbative physics, a boundary corresponding to the momentum scale associated
with a beta-function pole.


title: Crystalline Color Superconductivity

abstract:
  We give an introduction crystalline color superconductivity, arguing that it
is likely to occur wherever quark matter in which color-flavor locking does not
occur is found. We survey the properties of this form of quark matter, and
argue that its presence in a compact star may result in pulsar glitches, and
thus in observable consequences. However, elucidation of this proposal requires
an understanding of the crystal structure, which is not yet in hand.


title: Asymptotic dynamics of thermal quantum fields

abstract:
  It is shown that the timelike asymptotic properties of thermal correlation
functions in relativistic quantum field theory can consistently be described in
terms of free fields carrying some stochastic degree of freedom which couples
to the thermal background. These ``asymptotic thermal fields'' have specific
algebraic properties (commutation relations) and their dynamics can be
expressed in terms of asymptotic field equations. The formalism is applied to
interacting theories where it yields concrete non-perturbative results for the
asymptotic thermal propagators. The results are consistent with the expected
features of dissipative propagation of the constitutents of thermal states,
outlined in previous work, and they shed new light on the non-perturbative
effects of thermal backgrounds.


title:
Nonequilibrium evolution in scalar O(N) models with spontaneous symmetry
  breaking

abstract:
  We consider the out-of-equilibrium evolution of a classical condensate field
and its quantum fluctuations for a scalar O(N) model with spontaneously broken
symmetry. In contrast to previous studies we do not consider the large N limit,
but the case of finite N, including N=1, i.e., plain $\lambda \phi^ 4$ theory.
The instabilities encountered in the one-loop approximation are prevented, as
in the large-N limit, by back reaction of the fluctuations on themselves, or,
equivalently, by including a resummation of bubble diagrams.
  For this resummation and its renormalization we use formulations developed
recently based on the effective action formalism of Cornwall, Jackiw and
Tomboulis. The formulation of renormalized equations for finite N derived here
represents a useful tool for simulations with realistic models. Here we
concentrate on the phase structure of such models. We observe the transition
between the spontaneously broken and the symmetric phase at low and high energy
densities, respectively. This shows that the typical structures expected in
thermal equilibrium are encountered in nonequilibrium dynamics even at early
times, i.e., before an efficient rescattering can lead to thermalization.


title:
Limits on Sizes of Fundamental Particles and on Gravitational Mass of a
  Scalar

abstract:
  We review the experimental limits on mass of excited fundamental particles
and contact interaction energy scale parameters $\Lambda$ for QCD, QED and
electroweak reactions. In particular we have focused on the QED reaction $
\EEGG $ at the energies from 91GeV{} to 202GeV{} using the differential
cross-sections measured by the L3 Collaboration from 1991 to 1999. A global fit
leads to lower limits at $ 95 % $ CL on $\Lambda > 1687$ GeV, which restricts
the characteristic QED size of the interaction region to $ R_{e} < 1.17 \times
10^{-17} $ cm. All the interaction regions are found to be smaller than the
Compton wavelength of the fundamental particles. This constraint is used to
estimate a lower limit on the size of a fundamental particle related to
gravitational interaction, applying the model of self-gravitating particle-like
structure with the de Sitter vacuum core. It gives $r_{\tau} \geq 2.3 \times
{10^{-17}}$ cm and $r_{e} \geq 1.5 \times 10^{-18} $ cm, if leptons get masses
at the electroweak scale, and $r_{\tau} \geq 3.3 \times {10^{-27}}$ cm, $r_{e}
\geq 4.9 \times 10^{-26} $ cm, as the most stringent limits required by
causality arguments. This sets also an upper limit on the gravitational mass of
a scalar $m_{scalar} \leq{154} $ GeV{} at the electroweak scale and (m_{scalar}
\leq \sqrt{3/8} m_{Pl}) as the most stringent limit.


title:
Single Spin Asymmetry Parameter from Deeply Virtual Compton Scattering
  of Hadrons up to Twist-3 accuracy: I. Pion case

abstract:
  The study of deeply virtual Compton scattering has shown that electromagnetic
gauge invariance requires, to leading order, not only twist two but additional
twist three contributions. We apply this analysis and, using the
Ellis-Furmanski-Petronzio factorization scheme, compute the single (electron)
spin asymmetry arising in the collision of longitudinally polarized electrons
with hadrons up to twist 3 accuracy. In order to simplify the kinematics we
restrict the actual calculation to pions in the chiral limit. The process is
described in terms of the generalized parton distribution functions which we
obtain within a bag model framework.


title:
Calculation of two-loop virtual corrections to b --> s l+ l- in the
  standard model

abstract:
  We present in detail the calculation of the virtual O(alpha_s) corrections to
the inclusive semi-leptonic rare decay b --> s l+ l-. We also include those
O(alpha_s) bremsstrahlung contributions which cancel the infrared and mass
singularities showing up in the virtual corrections. In order to avoid large
resonant contributions, we restrict the invariant mass squared s of the lepton
pair to the range 0.05 < s/mb^2 < 0.25. The analytic results are represented as
expansions in the small parameters s/mb^2, z = mc^2/mb^2 and s/(4 mc^2). The
new contributions drastically reduce the renormalization scale dependence of
the decay spectrum. For the corresponding branching ratio (restricted to the
above s-range) the renormalization scale uncertainty gets reduced from +/-13%
to +/-6.5%.


title: $J/\psi$ suppression in Pb+Pb collisions, a conventional description

abstract:
  We have analyzed the latest NA50 data on $J/\psi$ suppression in Pb + Pb
collisions. $J/\psi$ production is assumed to be a two step process, (i)
formation of $c\bar{c}$ pair, which is accurately calculable in QCD and (ii)
formation of $J/\psi$ meson from the $c\bar{c}$ pair, which can be conveniently
parameterized. In a pA/AA collision, the as the $c\bar{c}$ pair pass through
the nuclear medium, it gain relative square momentum at the rate of
$\epsilon^2$ per unit path length. As a result, some of the $c\bar{c}$ pairs
can gain enough momentum to cross the threshold to become an open charm meson,
leading to suppression in pA/AA collisions. The parameters of the model were
fixed from experimental data on the total $J/\psi$ cross section as a function
of effective nuclear length. The model without any free parameter, give
excellent description of NA50 data on $E_T$ dependence of $J/\psi$ to Drell-Yan
ratio. The model was applied to predict the $E_T$ dependence of $J/\psi$ at
RHIC energy. Much larger suppression of $J/\psi$, in agreement with other model
calculations are predicted.


title: Generalization of the Dick Model

abstract:
  We discuss a model with a massless scalar coupling to the Yang-Mills SU(2)
gauge field in four-dimensional space-time. The solutions from static,
pointlike colour source are given. There exists not only solutions with finite
energy but also singular one which describes confinement. The confining
potential depends on the $\delta$ parameter of our model. The regular magnetic
monopole solutions as well as the singular dyon configurations are also
obtained. We fit the $\delta $ parameter to the experimental data.


title: Two-Quark Correlations in the Hard Electromagnetic Nucleon Form Factors

abstract:
  The, so called, "hard-scattering approach" represents a suitable framework
for the perturbative treatment of exclusive hadronic processes at large
energies and (transverse) momentum transfers. In this context, diquarks can
serve as a useful phenomenological concept to model non-perturbative effects
which are still observable in the kinematic range accessible by present-day
experiments. We outline how a description of baryons as quark-diquark systems
can be understood as an effective theory in the sense that the pure quark
hard-scattering approach is recovered in the limit of asymptotically large
momentum transfers. Our arguments are based on a reformulation of the
hard-scattering formalism in terms of quark-diquark degrees of freedom. This
reformulation provides the exact form of photon- and gluon-diquark vertices and
corresponding vertex functions (diquark form factors) in the limit of
asymptotically large momentum transfers -- and thus also asymptotic constraints
which should be fulfilled by phenomenological quark-diquark models for hard
scattering. As an application of this reformulation we present an analysis of
the hard electromagnetic nucleon form factors with respect to their
quark-diquark content.


title: Photoproduction of Heavy Quarkonia

abstract:
  We investigate the reaction gamma+p -> V+p, with V denoting a Phi or a J/Psi
meson, within the scope of perturbative QCD, treating the proton as a
quark-diquark system. Our predictions extrapolate the existing forward
differential cross-section data into the few-GeV momentum-transfer region. In
case of the J/Psi reasonable results are only obtained by properly taking into
account its mass in the perturbative calculation of the hard-scattering
amplitude.


title: Minimal Flavour Mixing of Quarks and Leptons

abstract:
  Present situation in the flavour mixing of quarks and leptons is briefly
reviewed and a new approach called the Minimal Flavour Mixing (MFM) is
considered in detail. According to MFM the whole of the flavour mixing is
basically determined by the physical mass generation of the first family of
fermions. So, in the chiral symmetry limit when the masses of the lightest
quarks, u and d, vanish, all the weak mixing angle vanish. This minimal pattern
is shown to fit extremely well the already established CKM matrix elements and
to give fairly distinctive predictions for the as yet poorly known ones.
Remarkably, together with generically small quark mixing it also leads to the
large neutrino mixing thus giving adequate solution to the solar and
athmospheric neutrino oscillation problem. The possible origin of this approach
in the MSSM extended by the high-scale $SU(3)_{F}$ chiral family symmetry is
discussed.


title:
Unintegrated parton densities applied to heavy quark production in the
  CCFM approach

abstract:
  The application of k_t - factorization supplemented with the CCFM small-x
evolution equation to heavy quark production is discussed. The b-b_bar
production cross sections at the TEVATRON can be consistently described using
the k_t-factorization formalism together with the unintegrated gluon density
obtained within the CCFM evolution approach from a fit to HERA F_2 data.
Special attention is drawn to the comparison with measured visible cross
sections. The visible measured cross sections at HERA are compared to the
hadron level Monte Carlo generator CASCADE.


title: Higgs production plus two jets at hadron colliders

abstract:
  In this talk we present a calculation of Higgs production via gluon fusion in
association with two jets, including the full top-quark mass dependence, and
compare it to the large top-mass limit. We find that the large top-mass limit
is a good approximation as long as the Higgs mass is smaller than the top quark
pair mass, and the jet transverse energies are smaller than the top mass. In
addition, we compare Higgs production via gluon fusion and via weak-boson
fusion, and consider final-state distributions, like the rapidity interval
between the jets and the jet-jet azimuthal decorrelation, which may allow us to
distinguish one fusion process from the other.


title: 2-point 2-loop graph with arbitrary self-energy insertions

abstract:
  This paper has been withdrawn by the author, since most of the results have
been published before.


title:
Complex flavour couplings in supersymmetry and unexpected CP-violation
  in the decay B -> phi K

abstract:
  Complex flavour couplings (off-diagonal mass terms) in the squark sector of
supersymmetric theories may drastically alter both the rate and the
CP-violating asymmetry of certain B-meson decays. We consider the effects of
couplings that induce b -> s transitions and lead to final state with
strangeness one. We investigate the bounds that must be satisfied by the new
terms and explore the possible implications on direct and mixing induced
asymmetries in the charged and neutral B -> J/Psi K and B -> phi K decays.


title: Theoretical Aspects of Neutrino Oscillation

abstract:
  I review some aspects concerning the physics of neutrino mixing and
oscillations. I discuss in some detail the physical neutrino oscillations
parameter space in the case of two and three family mixing, and briefly
describe the current knowledge of neutrino mixing parameters according to the
present solar, atmospheric, and reactor neutrino data. I also briefly comment
on the possibility of solving the LNSD anomaly together with the solar and
atmospheric ones. I conclude by emphasising that that even though in five to
ten years time a lot will be learnt from the next round of neutrino
experiments, a great deal about neutrino masses and neutrino mixing will remain
unknown.


title: Squark Mixing Contributions to CP violating phase gamma

abstract:
  We investigate the possibility that the CP violation due to the soft
supersymmetry breaking terms in squark mixing can give significant
contributions to the various $\gamma$ related parameters in B decays, different
from those of the Standard Model. We derive the new limits on
$(\delta^u_{12})_{LL,LR,RR}$ and on $(\delta^d_{23})_{LL,LR,RR}$ from the
recent data on $D^0$--$\bar{D}^0$ oscillation as well as those on
$B_s^0$--$\bar{B_s}^0$ oscillation. We show that, together with all the other
constraints, the currents limits on these parameters still allow large
contributions to the CP violating phases in $B_s^0$--$\bar{B_s}^0$ as well as
$D^0$--$\bar{D}^0$ oscillations which will modify some of the proposed
measurements of $\gamma$ parameters in CP violating B decays. However, the
current constraints already dictate that the one-loop squark mixing
contributions to various B decay amplitudes cannot be competitive with that of
the Standard Model (SM), at least for those B decay modes which are dominated
the tree level amplitudes within the SM, and therefore they are not significant
in contributing to CP asymmetries in the corresponding B decays.


title: Determination of Parton Distribution Functions in Nuclei

abstract:
  Nuclear parton distribution functions are obtained by a chi^2 analysis of
lepton deep inelastic experimental data. It is possible to determine
valence-quark distributions at medium x and antiquark distributions at small x;
however, the distributions in other x regions and gluon distributions cannot be
fixed. We need a variety of experimental data and also further analysis
refinements.


title: Updates of $W_R$ effects on CP angles determination in B decays

abstract:
  The recently observed CP violation in B decay and $B$-$\ovar{B}$ mixing data
put constraints on the mass of $W_R$ and the parameters of the right-handed
current quark mixing matrix $V^R$ in $SU(2)_L \times SU(2)_R\times U(1)$ gauge
model. It is shown that the allowed region of parameters are severely
restricted for light $W_R$ with mass on the order of 1 TeV. There exist sets of
parameters which can accommodate large CP violation as measured by Belle,
$\sin2\phi_1|_{exp}\simeq 1$, for $M_{W_R}=1 \sim 10$ TeV.


title: Leptogenesis via $LH_{u}$ flat direction with a gauged $U(1)_{B-L}$

abstract:
  We study the supersymmetric leptogenesis via $LH_{u}$ flat direction with a
gauged $U(1)_{B-L}$ symmetry. We find that the resultant baryon asymmetry is
enhanced compared with the case without a gauged $U(1)_{B-L}$ symmetry. The
baryon asymmetry is proportional to the reheating temperature of inflation, but
it is independent of the gravitino mass. If high reheating temperatures of
inflation $T_{R}\sim 10^{10}\GEV$ are available, the mass of the lightest
neutrino, $m_{\nu 1}\sim 10^{-4}\EV$, is small enough to explain the baryon
asymmetry in the present universe. Furthermore, the gravitino mass independence
of the produced baryon asymmetry allows us to explain the present baryon
asymmetry even in low energy SUSY breaking scenarios such as gauge-mediation
models. Our leptogenesis scenario is also very special in the sense that it is
completely free from the serious Q-ball formation problem.


title: Neutrinos, Oscillations, and Big Bang Nucleosynthesis

abstract:
  The role of neutrinos in big bang nucleosynthesis is reviewed. Neutrino
oscillations in the early universe both in resonance and non-resonance case are
briefly discussed. BBN and supernova limits on heavy sterile neutrinos with the
mass in 10-100 MeV range are presented and compared with direct experimental
bounds.


title: Minimal Mixing of Quarks and Leptons in the SU(3) Theory of Flavour

abstract:
  We argue that flavour mixing, both in the quark and lepton sector, follows
the minimal mixing pattern, according to which the whole of this mixing is
basically determined by the physical mass generation for the first family of
fermions. So, in the chiral symmetry limit when the masses of the lightest ($u$
and $d$) quarks vanish, all the quark mixing angles vanish. This minimal
pattern is shown to fit extremely well the already established CKM matrix
elements and to give fairly distinctive predictions for the as yet poorly known
ones. Remarkably, together with generically small quark mixing, it also leads
to large neutrino mixing, provided that neutrino masses appear through the
ordinary ``see-saw'' mechanism. It is natural to think that this minimal
flavour mixing pattern presupposes some underlying family symmetry, treating
families of quarks and leptons in a special way. Indeed, we have found a local
chiral $SU(3)_{F}$ family symmetry model which leads, through its dominant
symmetry breaking vacuum configuration, to a natural realization of the
proposed minimal mechanism. It can also naturally generate the quark and lepton
mass hierarchies. Furthermore spontaneous CP violation is possible, leading to
a maximal CP violating phase $\delta =\frac{\pi}{2}$, in the framework of the
MSSM extended by a high-scale $SU(3)_{F}$ chiral family symmetry.


title: New Trends in the Zee Model

abstract:
  Recent trends in the Zee model are reviewed. Especially, the importance of a
serious constraint in the Zee model, sin^2 2\theta_{solar} =1.0, is pointed
out.


title:
Identifying the quark content of the isoscalar scalar mesons f_0(980),
  f_0(1370), and f_0(1500) from weak and electromagnetic processes

abstract:
  The assignments of the isoscalar scalar mesons f0(980), f0(1370), and
f0(1500) in terms of their qqbar substructure is still a matter of heated
dispute. Here we employ the weak and electromagnetic decays D(s)(+) to f0+pi(+)
and f0 two-photon decays, respectively, to identify the f0(980) and f0(1500) as
mostly ssbar, and the f0(1370) as dominantly nonstrange, in agreement with
previous work. The two-photon decays can be satisfactorily described with quark
as well as with meson loops, though the latter ones provide a less
model-dependent and more quantitative description.


title:
Novel solutions of RG equations for alpha(s) and beta(alpha) in the
  large N_c limit

abstract:
  General solution of RG equations in the framework of background perturbation
theory is written down in the large N_c limit. A simplified (model)
approximation to the general solution is suggested which allows to write
beta(alpha) and alpha(beta) to any loop order. The resulting alpha_B(Q^2)
coincides asymptotically at large $|Q^2|$ with standard (free) alpha_s,
saturates at small Q^2 and has poles at time-like Q^2 in agreement with
analytic properties of physical amplitudes in the large N_c limit.


title: A statistical approach for polarized parton distributions

abstract:
  A global next-to-leading order QCD analysis of unpolarized and polarized
deep-inelastic scattering data is performed with parton distributions
constructed in a statistical physical picture of the nucleon. The chiral
properties of QCD lead to strong relations between quarks and antiquarks
distributions and the importance of the Pauli exclusion principle is also
emphasized. We obtain a good description, in a broad range of $x$ and $Q^2$, of
all measured structure functions in terms of very few free parameters. We
stress the fact that at RHIC-BNL the ratio of the unpolarized cross sections
for the production of $W^+$ and $W^-$ in $pp$ collisions, will directly probe
the behavior of the $\bar d(x) / \bar u(x)$ ratio for $x \geq 0.2$, a definite
and important test for the statistical model. Finally, we give specific
predictions for various helicity asymmetries for the $W^{\pm}, Z$ production in
$pp$ collisions at high energies, which will be measured with forthcoming
experiments at RHIC-BNL and are sensitive tests of the statistical model for
$\Delta \bar u(x)$ and $\Delta \bar d(x)$.


title: Massive neutrinos and lepton-flavour-violating processes

abstract:
  If neutrino masses and mixings are suitable to explain the atmospheric and
solar neutrino fluxes, this amounts to contributions to FCNC processes, in
particular $\mu\to e, \gamma$. If the theory is supersymmetric and the origin
of the masses is a see-saw mechanism, we show that the prediction for
BR($\mu\to e, \gamma$) is in general larger than the experimental upper bound,
especially if the solar data are explained by a large angle MSW effect, which
recent analyses suggest as the preferred scenario.


title: String Inspired Z' Model With Stable Proton and Light Neutrino Masses

abstract:
  Grand unification, and its incarnation in the form of heterotic-string
unification, are the only extensions of the Standard Model that are rooted in
the structure of the Standard Model itself. In this context, it was proposed
that the exclusiveness of proton stability and suppression of neutrino masses
necessitates the existence of an additional U(1)_Z' symmetry, which is of
non-GUT origin and remains unbroken down to intermediate, or low, energies.
Realistic string models frequently give rise to non-GUT U(1) symmetries, which
arise from the flavor symmetries in the models. In this paper we demonstrate in
a string-inspired toy model that such a stringy Z' can indeed guarantee proton
longevity and viable phenomenology in the neutrino sector, as well as in the
quark and charged lepton sectors.


title: Neutrinos in Stochastic Media: From Sun to Core-Collapse Supernovae

abstract:
  Recent work on neutrino propagation in stochastic media and its implications
for the Sun and core-collapse supernovae are reviewed. It is shown that recent
results from Sudbury Neutrino Observatory and SuperKamiokande combined with a
best global fit value of $\delta m^2= 5\times 10^{-5}$ eV$^2$ and $\tan^2
\theta = 0.3$ rule out solar electron density fluctuations of a few percent or
more. It is argued that solar neutrino experiments may be able to rule out even
smaller fluctuations in the near future.


title: Diffractive charm photoproduction at HERA ep-collider

abstract:
  The cross section of the $D^*$-meson diffractive photoproduction at the HERA
collider has been calculated in the framework of perturbatively motivated model
for the different kinematic regions. The camparison between the different
Pomeron models has been performed.


title: Instantaneous Bethe-Salpeter equation: improved analytical solution

abstract:
  Studying the Bethe-Salpeter formalism for interactions instantaneous in the
rest frame of the bound states described, we show that, for bound-state
constituents of arbitrary masses, the mass of the ground state of a given spin
may be calculated almost entirely analytically with high accuracy, without the
(numerical) diagonalization of the matrix representation obtained by expansion
of the solutions over a suitable set of basis states.


title: Particle Physics Experiments at JLC

abstract: ACFA Linear Collider Working Group report


title:
Inclusive D* Production in Photon-Photon Collisions at Next-to-Leading
  Order QCD

abstract:
  The next-to-leading order cross section for the inclusive production of charm
quarks in gamma-gamma collisions is calculated as a function of the transverse
momentum pT and the rapidity y in approaches using massive or massless charm
quarks. For the direct cross section we derive the massless limit from the
massive theory with the result that this limit differs from the massless
version with MSbar factorization by finite corrections. Subtracting or adding
these corrections allows us to compare the two approaches on equal footing. We
establish massless and massive versions with 3 and 4 initial flavours which are
shown to approach the massless approximations very fast with increasing pT.
With these results we calculate the inclusive D* cross section in gamma-gamma
collisions using realistic evolved fragmentation functions with appropriate
factorization scales and compare with recent data for dsigma/dpT from three LEP
collaborations after single- and double-resolved contributions have been added.


title: Analytic resummation and power corrections for DIS and Drell--Yan

abstract:
  Dimensional continuation is applied to resummed expressions for the DIS and
Drell-Yan partonic cross sections, to regularize the Landau pole. Simple
analytic expression are obtained, encoding information about nonperturbative
power--suppressed effects.


title: Semileptonic decays of charmed mesons in the effective action of QCD

abstract:
  Within the framework of phenomenological Lagrangians we construct the
effective action of QCD relevant for the study of semileptonic decays of
charmed mesons. Hence we evaluate the form factors of D -> P(0^-) l^+ nu_l at
leading order in the 1/N_C expansion and, by demanding their QCD-ruled
asymptotic behaviour, we constrain the couplings of the Lagrangian. The
features of the model-independent parameterization of form factors provided and
their relevance for the analysis of experimental data are pointed out.


title: Quantum Fields far from Equilibrium and Thermalization

abstract:
  I review the use of the 2PI effective action in nonequilibrium quantum field
theory. The approach enables one to find approximation schemes which circumvent
long-standing problems of non-thermal or secular (unbounded) late-time
evolutions encountered in standard loop or 1/N expansions of the 1PI effective
action. It is shown that late-time thermalization can be described from a
numerical solution of the three-loop 2PI effective action for a scalar
$\phi^4$--theory in 1+1 dimensions (with Jurgen Cox, hep-ph/0006160).
Quantitative results far from equilibrium beyond the weak coupling expansion
can be obtained from the 1/N expansion of the 2PI effective action at
next-to-leading order (NLO), calculated for a scalar O(N) symmetric quantum
field theory (hep-ph/0105311). Extending recent calculations in classical field
theory by Aarts et al. (hep-ph/0007357) and by Blagoev et al. (hep-ph/0106195)
to $N>1$ we show that the NLO approximation converges to exact (MC) results
already for moderate values of $N$ (with Gert Aarts, hep-ph/0107129). I comment
on characteristic time scales in scalar quantum field theory and the
applicability of classical field theory for sufficiently high initial
occupation numbers.


title:
Scaling and asymptotic behavior of the $\gamma^* p$ total cross section
  at low x

abstract:
  The scaling in $\sigma_{\gamma^*p}$ cross sections (for $Q^2/W^2 << 1$) in
terms of the scaling variable $\eta = (Q^2 + m^2_0)/\Lambda^2 (W^2)$ is
interpreted in the generalized vector dominance/color-dipole picture (GVD/CDP).
The quantity $\Lambda^2 (W^2)$ is identified as the average gluon transverse
momentum absorbed by the $q \bar q$ state, $<\vec l^{~2}> = (1/6) \Lambda^2
(W^2)$. At any $Q^2$, for $W^2 \to \infty$, the cross sections for virtual and
real photons become universal, $\sigma_{\gamma^*p}(W^2,Q^2)/\sigma_{\gamma
p}(W^2) \to 1$. The gluon density corresponding to the color-dipole cross
section in the appropriate limit is found to be consistent with the results
from QCD fits.


title: Which solar neutrino experiment after KamLAND and Borexino?

abstract:
  We estimate how well we will know the parameters of solar neutrino
oscillations after KamLAND and Borexino. The expected error on Delta m^2 is few
per-mille in the VO and QVO regions, few per-cent in the LMA region, and around
10% in the LOW region. The expected error on sin^2 2theta is around 5%. KamLAND
and Borexino will tell unambiguously which specific new measurement, dedicated
to pp solar neutrinos, is able to contribute to the determination of theta and
perhaps of Delta m^2. The present data suggest as more likely outcomes: no
measurement, or the total pp rate, or its day/night variation.


title: Global Strings in High Density QCD

abstract:
  We show that several types of global strings occur in colour superconducting
quark matter due to the spontaneous violation of relevant U(1) symmetries.
These include the baryon U(1)_B, and approximate axial U(1)_A symmetries as
well as an approximate U(1)_S arising from kaon condensation. We discuss some
general properties of these strings and their interactions. In particular, we
demonstrate that the U(1)_A strings behave as superconducting strings. We draw
some parallels between these strings and global cosmological strings and
discuss some possible implications of these strings to the physics in neutron
star cores.


title:
Exploring skewed parton distributions with two body models on the light
  front II: covariant Bethe-Salpeter approach

abstract:
  We explore skewed parton distributions for two-body, light-front wave
functions. In order to access all kinematical regimes, we adopt a covariant
Bethe-Salpeter approach, which makes use of the underlying equation of motion
(here the Weinberg equation) and its Green's function. Such an approach allows
for the consistent treatment of the non-wave function vertex (but rules out the
case of phenomenological wave functions derived from ad hoc potentials). Our
investigation centers around checking internal consistency by demonstrating
time-reversal invariance and continuity between valence and non-valence
regimes. We derive our expressions by assuming the effective qq potential is
independent of the mass squared, and verify the sum rule in a non-relativistic
approximation in which the potential is energy independent. We consider
bare-coupling as well as interacting skewed parton distributions and develop
approximations for the Green's function which preserve the general properties
of these distributions. Lastly we apply our approach to time-like form factors
and find similar expressions for the related generalized distribution
amplitudes.


title:
New Indications of Changing the Regime of Multiple Production at
  Superhigh Energies

abstract:
  The effect of alignment of secondary particles (products of hadron
interactions at superhigh energies $E^\mathrm{{in}}\geq5\cdot10^{6}$ GeV) as a
"fan", which has been observed in cosmic rays, is analysed. It is shown that
its main specific features are well described within the model that we proposed
twenty years ago to explain sharp anomalies in the process of multiple
production, which are observed in the same energy range. This model assumes
that quarks have internal massive degrees of freedom. Some consequences of the
used approach are discussed, which may be important for the multiple process in
the above-mentioned region.


title: Fermion production from preheating-amplified metric perturbations

abstract:
  We study gravitational creation of light fermions in the presence of
classical scalar metric perturbations about a flat Friedmann-Lemaitre-
Robertson-Walker (FLRW) background. These perturbations can be large during
preheating, breaking the conformal flatness of the background spacetime. We
compute numerically the total number of particles generated by the modes of the
metric perturbations which have grown sufficiently to become classical. In the
absence of inhomogeneities massless fermions are not gravitationally produced,
and then this effect may be relevant for abundance estimates of light
gravitational relics.