title: E1 Working Group Summary: Neutrino Factories and Muon Colliders

abstract:
  We are in the middle of a time of exciting discovery, namely that neutrinos
have mass and oscillate. In order to take the next steps to understand this
potential window onto what well might be the mechanism that links the quarks
and leptons, we need both new neutrino beams and new detectors. The new
beamlines can and should also provide new laboratories for doing charged lepton
flavor physics, and the new detectors can and should also provide laboratories
for doing other physics like proton decay, supernovae searches, etc. The new
neutrino beams serve as milestones along the way to a muon collider, which can
answer questions in yet another sector of particle physics, namely the Higgs
sector or ultimately the energy frontier. In this report we discuss the current
status of neutrino oscillation physics, what other oscillation measurements are
needed to fully explore the phenomenon, and finally, what other new physics can
be explored as a result of building of these facilities.


title: A polarized version of the CCFM equation for gluons

abstract:
  A derivation for a polarized CCFM evolution equation which is suitable to
describe the scaling behavior of the the unintegrated polarized gluon density
is given. We discuss the properties of this polarized CCFM equation and compare
it to the standard CCFM equation in the unpolarized case.


title: Limitations of B-meson mixing bounds on technicolor theories

abstract:
  Recent work by Burdman, Lane, and Rador has shown that B-meson mixing places
stringent lower bounds on the masses of topgluons and Z' bosons in classic
topcolor-assisted technicolor (TC2) models. This paper finds analogous limits
on the Z' bosons of flavor-universal TC2 and non-commuting extended technicolor
models, and compares the limits with those from precision electroweak
measurements. A discussion of the flavor structure of these models (contrasted
with that of classic TC2) shows that B-meson mixing is a less reliable probe of
these models than of classic TC2.


title: Wave Equation Solutions and Pair Production for Arbitrary Spin Particles

abstract:
  We investigate the theory of particles with arbitrary spin and magnetic
moment in the Lorentz representation (0,s)X(s,0) in an external constant and
uniform electromagnetic field. We obtain the density matrix of free particles
in pure spin states. The differential probability of pair producing particles
with arbitrary spin by an external constant and uniform electromagnetic field
is found using the exact solutions. We calculate the imaginary and real parts
of the Lagrangian in an electromagnetic field that takes into account the
vacuum polarization.


title:
Prospects for Searching for Excited Leptons during RunII of the Fermilab
  Tevatron

abstract:
  This letter presents a study of prospects of searching for excited leptons
during RunII of the Fermilab Tevatron. We concentrate on single and pair
production of excited electrons in the photonic decay channel in one CDF/DO
detector equivalent for 2 fb^{-1}. By the end of RunIIa, the limits should be
easily extended beyond those set by LEP and HERA for excited leptons with mass
above about 190 GeV.


title: A verification of the Optimal Jet Finder

abstract:
  The fortran-77 code [hep-ph/9912415] of the jet algorithm based on the
optimal jet definition [hep-ph/9901444] has been successfully verified (up to a
few interface bugs) using an independently evolved code written in the
object-oriented language Component Pascal [http://www.oberon.ch]. The final
fortran code OJF_014 is available on the Web.


title: The circle electromagnetic pulsar

abstract:
  The power spectrum formula of the synchrotron radiation generated by the
electron and positron moving along the concentric circles at the opposite
angular velocities in homogenous magnetic field is derived in the Schwinger
version of quantum electrodynamics. The asymptotical form of this formula is
found. The spectrum depends periodically on time which means that the system
composed from electron, positron and magnetic field forms the pulsating system.
The similar calculations are performed in the case that the circles of motion
are excentric.


title: Overview of deeply virtual Compton scattering

abstract:
  We give a short overview of recent developments in understanding of the
deeply virtual Compton scattering on the proton target.


title:
Top quark electric and chromo electric dipole moments in the general two
  Higgs Doublet model

abstract:
  We study the electric and chromo electric dipole moment of top quark in the
general two Higgs Doublet model (model III). We analyse the dependency of this
quantity to the new phases coming from the complex Yukawa couplings and masses
of charged and neutral Higgs bosons. We observe that the electric and chromo
elecric dipole moments of top quark are at the order of 10^{-21} e cm and
10^{-20} g_s cm, which are extremely large values compared to ones calculated
in the SM and also two Higgs Doublet model with real Yukawa couplings.


title: Renormalization of an effective model Hamiltonian by a counter term

abstract:
  An ill-defined integral equation for modeling the mass-spectrum of mesons is
regulated with an additional but unphysical parameter. This parameter
dependance is removed by renormalization. Illustrative graphical examples are
given.


title: On the structure of the pion: A QCD--inspired point of view

abstract:
  The effective interaction between a quark and an anti-quark as obtained
previously with by the method of iterated resolvents is replaced by the so
called up-down-model and applied to flavor off-diagonal mesons including the
pion. The only free parameters are those of canonical quantum chromo-dynamics
(QCD), particularly the coupling constant and the masses of the quarks. The so
obtained light-cone wave function can be used to calculate the pion's form
factor, particularly its mean-square radius can be computed analytically. The
results allow for the exciting conclusion that the pion is built by highly
relativistic constituents, in strong contrast to composite systems like atoms
or nuclei with non-relativistic constituents.


title: CPT and Lorentz Violation in Kaons and Other Systems

abstract:
  This talk provides a status report on CPT violation in neutral-meson
oscillations, focusing on implications of the CPT- and Lorentz-violating
standard-model extension.


title: Collider versus Cosmic Ray Sensitivity to Black Hole Production

abstract:
  In scenarios with extra dimensions and TeV-scale quantum gravity, black holes
are expected to be produced copiously at center-of-mass energies above the
fundamental Planck scale. The Large Hadron Collider (LHC) may thus turn into a
factory of black holes, at which their production and evaporation may be
studied in detail. But even before the LHC starts operating, the Pierre Auger
Observatory for cosmic rays, presently under construction, has an opportunity
to search for black hole signatures. Black hole production in the scattering of
ultrahigh energy cosmic neutrinos on nucleons in the atmosphere may initiate
quasi-horizontal air showers far above the Standard Model rate. In this letter,
we compare the sensitivity of LHC and Auger to black hole production by
studying their respective reach in black hole production parameter space.
Moreover, we present constraints in this parameter space from the
non-observation of horizontal showers by the Fly's Eye collaboration. We find
that if the ultrahigh energy neutrino flux is at the level expected from cosmic
ray interactions with the cosmic microwave background radiation, Auger has only
a small window of opportunity to detect black holes before the start of the
LHC. If, on the other hand, larger ultrahigh energy neutrino fluxes on the
level of the upper limit from ``hidden'' hadronic astrophysical sources are
realized in nature, then the first signs of black hole production may be
observed at Auger. Moreover, in this case, the Fly's Eye constraints, although
more model dependent, turn out to be competitive with other currently available
constraints on TeV-scale gravity which are mainly based on interactions
associated with Kaluza-Klein gravitons.


title:
A next-to-leading order study of pion-pair production and comparison
  with E706 data

abstract:
  We discuss the production of pion pairs with a large invariant mass in
hadronic collisions. We present a study based on a perturbative QCD calculation
at full next-to-leading order accuracy, implemented in the computer programme
DIPHOX. We provide a comparison of various predictions with the corresponding
observables measured by the E706 fixed target experiment. Discrepancies between
data and next-to-leading order calculation are carefully analysed. We classify
the theoretical next-to-leading order distributions with respect to their
infra-red sensitivity, and explain which distributions need improvements.
Further, we comment on the energy scale dependences of non pertubative effects.


title:
Non-Standard Time Reversal for Particle Multiplets and the Spin-Flavor
  Structure of Hadrons

abstract:
  We show that a system of quarks interacting with chiral fields provides a
physical representation of a ``non-standard'' time reversal for particle
multiplets proposed by Weinberg. As an application, we argue that, if the
internal structure of hadrons is described by a chiral lagrangian, the
so-called time-reversal-odd quark distribution functions might not be forbidden
by time-reversal invariance.


title: Cuts in the invariant mass of resonances in many body decays of mesons

abstract:
  Resonance-mediated many body decays of heavy mesons are analyzed. We focus on
some particular processes, in which the available phase space for the decay of
the intermediate resonance is very narrow. It is shown that the mass selection
criteria used in several experimental studies of D and B meson decays could
lead to a significant underestimation of branching ratios.


title: On Factorization, Quark Counting, and Vector Dominance

abstract:
  Using an eikonal structure for the scattering amplitude, Block and Kaidalov
have derived factorization theorems for nucleon-nucleon, $\gamma p$ and
$\gamma\gamma$ scattering at high energies, using only some very general
assumptions. We present here an analysis giving experimental confirmation for
factorization of cross sections, nuclear slope parameters B and $\rho$-values
(ratio of real to imaginary portion of forward scattering amplitudes), showing
that: i) the three factorization theorems hold, ii) the additive quark model
holds to ~1%, and iii) vector dominance holds to better than ~4%.


title: Signals from extra dimensions decoupled from the compactification scale

abstract:
  Multilocalization provides a simple way of decoupling the mass scale of new
physics from the compactification scale of extra dimensions. It naturally
appears, for example, when localization of fermion zero modes is used to
explain the observed fermion spectrum, leaving low energy remnants of the
geometrical origin of the fermion mass hierarchy. We study the phenomenology of
the simplest five dimensional model with order one Yukawa couplings reproducing
the standard fermion masses and mixing angles and with a light Kaluza-Klein
quark Q_{2/3} saturating experimental limits on V_{tb} and m_Q, and then with
observable new effects at Tevatron.


title: Leading Chiral Contributions to the Spin Structure of the Proton

abstract:
  The leading chiral contributions to the quark and gluon components of the
proton spin are calculated using heavy-baryon chiral perturbation theory.
Similar calculations are done for the moments of the generalized parton
distributions relevant to the quark and gluon angular momentum densities. These
results provide useful insight about the role of pions in the spin structure of
the nucleon, and can serve as a guidance for extrapolating lattice QCD
calculations at large quark masses to the chiral limit.


title: The QCD Phase Diagram and Explosive Astrophysics

abstract:
  I give a brief overview of our current understanding of the QCD phase diagram
at finite temperature and baryon density. I emphasize phase transitions which
occur at high density and low temperature (relative to the QCD scale), such as
transition(s) to the color superconducting and chirally symmetric phases. These
transitions might occur during violent astrophysical activity such as type II
supernovae core bounce or neutron star mergers, and I discuss the possible
consequences.


title: Coherent Pair State of Pion in Constituent Quark Model

abstract:
  A coherent state of pions is introduced to the nonrelativistic quark model.
The coherent pair approximation is employed for the pion field in order to
maintain the spin-isospin symmetry. In this approximation the pion is localized
in the momentum space, and the vertex form factor in the pion-quark interaction
is derived from this localization. The nucleon masses and wave functions are
calculated using this model, and our results are compared to those of the quark
model with the one pion exchange potential. Similar result is obtained for the
mass spectrum, but there exists a clear difference in the internal structure of
nucleon resonances.


title: The Physics of Flavor is the Flavor of Physics

abstract:
  Summary Talk: International Conference of Flavor Physics (ICFP 2001).
Zhang-Jia-Jie. Hunan, China (May / June 2001)


title:
Suppression of High-P_T Jets as a Signal for Large Extra Dimensions and
  New Estimates of Lifetimes for Meta stable Micro Black Holes -From the Early
  Universe to Future Colliders

abstract:
  We address the production of black holes at LHC in space times with
compactified space-like large extra dimensions (LXD). Final state black hole
production leads to suppression of high-P_T jets, i.e. a sharp cut-off in the
cross section for pp->jet+X. This signal is compared to the jet plus missing
energy signature due to graviton production in the final state as proposed by
the ATLAS collaboration. Time evolution and lifetimes of the newly created
black holes are calculated based on the microcanonical formalism. It is
demonstrated that previous lifetime estimates of micro black holes have been
dramatically underestimated. The creation of a large number of quasi-stable
black holes is predicted with life times beyond hundred fm/c at LHC. Medium
modifications of the black holes evaporation rate due to the quark gluon plasma
in relativistic heavy ion collisions as well as provided by the cosmic fluid in
the early universe are studied.


title:
Inelastic Rescattering in B Decays to $\pi \pi$, $\pi K$, and
  $K\bar{K}$, and Extraction of $\gamma $

abstract:
  We discuss all contributions from inelastic SU(3)-symmetric rescattering in B
decays into a final pair of pseudoscalar mesons $PP = \pi \pi$, $K\bar{K}$,
$\pi K$. FSI-induced modifications of amplitudes obtained from the quark-line
approach are described in terms of a few parameters which take care of all
possible SU(3)-symmetric forms relevant for final-state interactions. Although
in general it appears impossible to uniquely determine FSI effects from the
combined set of all $\pi \pi$, $K \bar{K}$, and $\pi K$ data, drawing some
conclusions is feasible. In particular, it is shown that in leading order the
amplitudes of strangeness-changing B decays depend on only one additional
complex FSI-related parameter apart from those present in the definitions of
penguin and tree amplitudes. It is also shown that joint considerations of
U-spin-related $\Delta S =0$ and $|\Delta S|=1$ decay amplitudes are modified
when non-negligible SU(3)-symmetric FSI are present. In particular, if
rescattering in $B^+ \to K^+\bar{K}^0$ is substantial, determination of the
CP-violating weak angle $\gamma$ from $B^+ \to \pi ^+ K^0$, $B^0_d \to
\pi^-K^+$, $B^0_s \to \pi ^+ K^-$, and their CP counterparts might be
susceptible to important FSI-induced corrections.


title: New prospects for polarized hyperon fragmentation functions

abstract:
  We study the inclusive production of $\Lambda$ ($\bar \Lambda$) in several
high energy collision processes ($e^+e^-, e^{\pm}p, \nu (\bar \nu)p, pp$), in
view of an accurate determination of the unpolarized and polarized
fragmentation functions of a quark into a $\Lambda$ ($\bar \Lambda$).
  For polarized fragmentation functions the inaccuracy and the scarcity of
present data do not allow to distinguish between various theoretical models. We
will indicate how future measurements will provide ways to discriminate between
them and also how to achieve a necessary quark flavor separation. A possible
extension to the production of the other hyperons ($\Sigma^{\pm,0},
\Xi^{-,0}$), will be also briefly discussed.


title:
On the Parameters of the QCD-Motivated Potential in the Relativistic
  Independent Quark Model

abstract:
  In the framework of the relativistic independent quark model the parameters
of the QCD-motivated static potential and the quark masses are calculated on
the basis of the $1^{--}$ meson mass spectra. The value of the confining
potential coefficient is found to be ($0.197\pm 0.005) GeV${}^2$. for quark-
antiquark interaction independently on their flavours. The dependence of the
quasi-Coulombic potential strength on the interaction distance are consistent
with the QCD-motivated behaviour. The $q\bar q$-separations are evaluated and
the $e^+e^-$ decay widths are estimated with the help of relativistic
modification of the Van Royen-Weisskopf formula.


title: The cosmological information on neutrino mixing

abstract:
  Cosmology provides interesting information on neutrino mixing models with
sterile neutrinos. In this case non standard BBN effects can be relevant. We
show how the recent measurement of the baryon content from the observations of
CMB anisotropies together with the primordial nuclear abundances measurements
can be used to constrain them. In particular four neutrino mixing models are
potentially at variance with the cosmological observations. We also discuss the
possible scenarios from future experiments.


title: Selecting Supersymmetric String Scenarios From Sparticle Spectra

abstract:
  We approach the following question: if supersymmetry is discovered, how can
we select among different supersymmetric extensions of the Standard Model? In
particular, we perform an analysis of the sparticle spectrum in low-energy
string effective theories, asking which observables best distinguish various
scenarios. We examine scenarios differing by the fundamental string scale and
concentrate on GUT and intermediate scale models. We scan over all parameters
(two goldstino angles, tan beta and the gravitino mass) in each scenario,
finding ratios of sparticle masses that provide the maximum discrimination
between them. The necessary accuracy for discrimination is determined in each
case. We find that the required accuracy on various sparticle mass ratios is at
the few percent level, a precision that may be achieved in future linear
colliders. We also map out phenomenologically viable regions of parameter
space.


title:
Hadronic light-by-light corrections to the muon g-2: the pion-pole
  contribution

abstract:
  The correction to the muon anomalous magnetic moment from the pion-pole
contribution to the hadronic light-by-light scattering is considered using a
description of the pi0 - gamma* - gamma* transition form factor based on the
large-Nc and short-distance properties of QCD. The resulting two-loop integrals
are treated by first performing the angular integration analytically, using the
method of Gegenbauer polynomials, followed by a numerical evaluation of the
remaining two-dimensional integration over the moduli of the Euclidean loop
momenta. The value obtained, a_{mu}(LbyL;pi0) = +5.8 (1.0) x 10^{-10},
disagrees with other recent calculations. In the case of the vector meson
dominance form factor, the result obtained by following the same procedure
reads a_{mu}(LbyL;pi0)_{VMD} = +5.6 x 10^{-10}, and differs only by its overall
sign from the value obtained by previous authors. Inclusion of the eta and
eta-prime poles gives a total value a_{mu}(LbyL;PS) = +8.3 (1.2) x 10^{-10} for
the three pseudoscalar states. This result substantially reduces the difference
between the experimental value of a_{mu} and its theoretical counterpart in the
standard model.


title:
Hadronic light-by-light scattering contribution to the muon g-2: an
  effective field theory approach

abstract:
  The hadronic light-by-light contribution to a_{mu}, the anomalous magnetic
moment of the muon, is discussed from the point of view of an effective
low-energy theory. As an application, the coefficient of the leading logarithm
arising from the two-loop graphs involving two anomalous vertices is computed,
and found to be positive. This corresponds to a positive sign for the pion-pole
contribution to the hadronic light-by-light correction to a_{mu}, and to a
sizeable reduction of the discrepancy between the present experimental value of
a_{mu} and its theoretical counterpart in the standard model.


title:
Status and Prospects of Theoretical Predictions for Weak Gauge Boson
  Production Processes at Lepton and Hadron Colliders

abstract:
  For the envisioned precision measurement of the W-boson mass at present and
future lepton and hadron colliders it is crucial that the theoretical
predictions for the underlying production processes are well under control. We
briefly describe the status of the predictions for the W-pair-production
processes at e+ e- colliders, e+ e- -> W+ W- -> 4f, and for W- and Z-boson
production at pp and p anti-p colliders, pp, p anti-p -> W -> l nu_l and pp, p
anti-p -> Z,gamma -> l+ l- (l=e,mu). We also discuss the theoretical
improvements needed to meet the experimental accuracies one hopes to achieve in
future experiments.


title: Non-topological solitons in brane world models

abstract:
  We examine some general properties of a certain class of scalar filed theory
models containing non-topological soliton solutions in the context of brane
world models with compact large extra dimensions. If a scalar field is allowed
to propagate in extra space, then, beside standard Kaluza-Klein type
excitations, a whole new class of very massive soliton-type states can exist.
Depending on their abundance, they can be important dark matter candidates or
give significant contribution to entropy and energy density in our universe. .


title: Theoretical and Experimental Status of Magnetic Monopoles

abstract:
  The Tevatron has inspired new interest in the subject of magnetic monopoles.
First there was the 1998 D0 limit on the virtual production of monopoles, based
on the theory of Ginzberg and collaborators. In 2000 the first results from an
experiment (Fermilab E882) searching for real magnetically charged particles
bound to elements from the CDF and D0 detectors were reported. This also
required new developments in theory. The status of the experimental limits on
monopole masses will be discussed, as well as the limitation of the theory of
magnetic charge at present.


title: Perturbative QCD Analysis of Local Duality in a fixed W^2 Framework

abstract:
  We study the global Q^2 dependence of large x, F_2 nucleon structure function
data, with the aim of providing a perturbative-QCD based, quantitative analysis
of parton-hadron duality. As opposed to previous analyses at fixed x, we use a
framework in fixed W^2. We uncover a breakdown of the twist-4 approximation
with a renormalon type improvement at O(1/Q^4) which, by affecting the initial
evolution of parton distributions, will have consequences for pQCD analyses
also at large x and very large Q^2.


title:
Constraints from Accelerator Experiments on the Elastic Scattering of
  CMSSM Dark Matter

abstract:
  We explore the allowed ranges of cross sections for the elastic scattering of
neutralinos \chi on nucleons in the constrained minimal supersymmetric
extension of the Standard Model (CMSSM), in which scalar and gaugino masses are
each assumed to be universal at some input grand unification scale. We extend
previous calculations to larger \tan \beta and investigate the limits imposed
by the recent LEP lower limit on the mass of the Higgs boson and by b \to s
\gamma, and those suggested by g_\mu - 2. The Higgs limit and b \to s \gamma
provide upper limits on the cross section, particularly at small and large \tan
\beta, respectively, and the value of g_\mu - 2 suggests a lower limit on the
cross section for \mu > 0. The spin-independent nucleon cross section is
restricted to the range 6 \times 10^{-8} pb > \sigma_{SI} > 2 \times 10^{-10}
pb for \mu > 0, and the spin-dependent nucleon cross section to the range
10^{-5} pb > \sigma_{SD} > 2 \times 10^{-7} pb. Lower values are allowed if \mu
<0.


title:
Complementarity of muon-conversion and linear collider-based experiments
  for lepton-flavor violating U(1) gauge bosons

abstract:
  In general, attempts to extend the standard model will include extra gauge
structure. We parameterize string and technicolor models for a Z' boson with
primitive lepton flavor violating interactions. Calculations for its muon
conversion rate (mu N -> e N) on Titanium are made and used to show the
potential of forthcoming experiments MECO at Brookhaven National Laboratory and
PRIME at the Japan Hadron Facility (to be renamed). For reasonable choices of
parameters, such U(1) bosons with masses the order 10 TeV and mu-e Z' charge as
low as ~10^-5 are demonstrated to be accessible for MECO and PRIME. Also, a
demonstration of the complementarity of parameter space coverage for future
colliders and muon conversion experiments is given.


title:
The pion-nucleon Sigma term is definitely large: results from a G.W.U.
  analysis of pion nucleon scattering data

abstract:
  A new result for the pion nucleon Sigma term from a George Washington
University/TRIUMF group analysis of pion nucleon data is presented. The value
Sigma=79$\pm$7 MeV was obtained, compared to the canonical value 64$\pm$8 MeV
found by Koch. The difference is explained simply by the PSI pionic hydrogen
value for a(pi -p), the latest results for the $\pi NN$ coupling onstant, and a
narrower Delta resonance. Many systematic effects have been investigated,
including Coulomb corrections, and database changes, and our results are found
to be robust. In the standard interpretation, our value of Sigma implies a
nucleon strangeness fraction y/2~0.23. The implausibility of such a large
strange component suggests that the relationship between Sigma and nucleon
strangeness ought to be re-examined.


title: New analytic running coupling in QCD: higher loop levels

abstract:
  The properties of the new analytic running coupling are investigated at the
higher loop levels. The expression for this invariant charge, independent of
the normalization point, is obtained by invoking the asymptotic freedom
condition. It is shown that at any loop level the relevant $\beta$ function has
the universal behaviors at small and large values of the invariant charge. Due
to this feature the new analytic running coupling possesses the universal
asymptotics both in the ultraviolet and infrared regions irrespective of the
loop level. The consistency of the model considered with the general definition
of the QCD invariant charge is shown.


title: Gauge Coupling Unification from Unified Theories in Higher Dimensions

abstract:
  Higher dimensional grand unified theories, with gauge symmetry breaking by
orbifold compactification, possess SU(5) breaking at fixed points, and do not
automatically lead to tree-level gauge coupling unification. A new framework is
introduced that guarantees precise unification -- even the leading loop
threshold corrections are predicted, although they are model dependent. Precise
agreement with the experimental result, \alpha_s^{exp} = 0.117 \pm 0.002,
occurs only for a unique theory, and gives \alpha_s^{KK} = 0.118 \pm 0.004 \pm
0.003. Remarkably, this unique theory is also the simplest, with SU(5) gauge
interactions and two Higgs hypermultiplets propagating in a single extra
dimension. This result is more successful and precise than that obtained from
conventional supersymmetric grand unification, \alpha_s^{SGUT} = 0.130 \pm
0.004 \pm \Delta_{SGUT}. There is a simultaneous solution to the three
outstanding problems of 4D supersymmetric grand unified theories: a large mass
splitting between Higgs doublets and their color triplet partners is forced,
proton decay via dimension five operators is automatically forbidden, and the
absence of fermion mass relations amongst light quarks and leptons is
guaranteed, while preserving the successful m_b/m_\tau relation. The theory
necessarily has a strongly coupled top quark located on a fixed point and part
of the lightest generation propagating in the bulk. The string and
compactification scales are determined to be around 10^{17} GeV and 10^{15}
GeV, respectively.


title: Production of Spinning Black Holes at colliders

abstract:
  When the Planck scale is as low as TeV scale, there will be chances to
produce Black holes (BH's) at future colliders. Generally, BH's produced via
pariticle collisions could have non-zero angular momentum. We estimate the
production cross section of spinning and non-spinning BH's for future
colliders. Although the production cross section for the rotating BH is much
suppressed by angular momentum dependent factor, the total cross section could
be $\sim 2 -3$ times enhanced for the case of $\delta =4-6$.


title: Mass Effects On The Nucleon Sea Structure Functions

abstract:
  Nucleon sea structure functions are studied using
Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) equations with the massive
gluon-quark splitting kernels for strange and charm quarks, the massless
gluon-quark splitting kernels for up and down quarks, and the massless kernels
for all other splitting parts. The $SU(2)_f$ flavor symmetry for two light
quarks, `up' and `down', is assumed. Gl\"uck-Reya-Vogt(GRV) and
Martin-Roberts-Stirling(MRS) sets are chosen to be the base structure functions
at $Q_0^2=3$GeV$^2$. We evolve the sea structure functions from $Q_0^2=3$
GeV$^2$ to $Q^2=50$ GeV$^2$ using the base structure function sets and DGLAP
equations. Some (about 10%) enhancement is found in the strange quark
distribution functions at low $x(<0.1)$ in leading order of the DGLAP equations
compared to results direclty from those structure function sets at the the
value of $Q^2=50$ GeV$^2$. We provide the value of $\kappa$ and also show the
behavior of $\kappa(x)=2s(x)/(\bar u(x) + \bar d(x))$ after the evolution of
structure functions.


title: A Test of SU(15) at HERA Using The HELAS Program

abstract:
  A possible SU(15) process at HERA is investigated. The process that we
consider is $e^- P\ra \bar\nu_e \mu^- \mu^- +anything$ through the exchange of
new heavy gauge bosons $X^-$ and $X^{--}$ which are predicted in SU(15). This
process produces two easily observable like-sign muons in the final state. The
cross section of this process is calculated by using HELAS and VEGAS programs,
and PDF-library functions. The cross section turns out to be small to be
observed in near future.


title: The $\phi a_0\gamma$- and $\phi\sigma\gamma$-vertices in light cone QCD

abstract:
  We study $\phi a_0\gamma$- and $\phi\sigma\gamma$-vertices in the framework
of the light cone QCD sum rules and we estimate the coupling constants g$_{\phi
a_0\gamma}$ and g$_{\phi\sigma\gamma}$ utilizing $\omega\phi$-mixing. We
compare our results with the previous estimations of these coupling constants
in the literature obtained from phenomenological considerations.


title: T and CPT in B-Factories

abstract:
  For the Bd meson system, CP, T and CPT indirect violation can be described
using two physical parameters, epsilon and delta. The traditional observables
based on flavour tag and used in the kaon system, are not helpful in the Bd
case, and new asymmetries have to be introduced. Here such alternative
observables, based on CP tag, are presented, together with the first estimation
on the sensitivity that current asymmetric B-factories can achieve on their
measurement.


title:
Crystalline ground state in chiral Gross-Neveu and Cooper pair models at
  finite densities

abstract:
  We study the possibility of spatially non-uniform ground state in
(1+1)-dimensional models with quartic fermi interactions at finite fermion
densities by introducing chemical potential \mu. We examine the chiral
Gross-Neveu model and the Cooper pair model as toy models of the chiral
symmetry breaking and the difermion pair condensates which are presumed to
exist in QCD. We confirm in the chiral Gross-Neveu model that the ground state
has a crystalline structure in which the chiral condensate oscillates in space
with wave number 2\mu. Whereas in the Cooper pair model we find that the vacuum
structure is spatially uniform. Some discussions are given to explain this
difference.


title: Early thermalization at RHIC

abstract:
  It is shown that recent RHIC data on hadron spectra and elliptic flow can be
excellently reproduced within a hydrodynamic description of the collision
dynamics, and that this provides strong evidence for rapid thermalization while
the system is still in the quark-gluon plasma phase. But even though the
hydrodynamic approach provides an impressive description of the single-particle
momentum distributions, it fails to describe the two-particle momentum
correlation (HBT) data for central Au+Au collisions at RHIC. We suggest that
this is not likely to be repaired by further improvements in our understanding
of the early collision stages, but probably requires a better modelling of the
freeze-out process. We close with a prediction of the phases of the azimuthal
oscillations of the HBT radii in noncentral collisions at RHIC.


title: Gauged Inflation

abstract:
  We propose a model for cosmic inflation which is based on an effective
description of strongly interacting, nonsupersymmetric matter within the
framework of dynamical Abelian projection and centerization. The underlying
gauge symmetry is assumed to be $SU(N+1)$ with $N \gg 1$. Appealing to a
thermodynamical treatment, the ground-state structure of the model is
classically determined by a potential for the inflaton field (dynamical
monopole condensate) which allows for nontrivially BPS saturated and thereby
stable solutions. For $T<M_P$ this leads to decoupling of gravity from the
inflaton dynamics. The ground state dynamics implies a heat capacity for the
vacuum leading to inflation for temperatures comparable to the mass scale $M$
of the potential. The dynamics has an attractor property. In contrast to the
usual slow-roll paradigm we have $m\gg H$ during inflation. As a consequence,
density perturbations generated from the inflaton are irrelevant for the
formation of large-scale structure, and the model has to be supplemented with
an inflaton independent mechanism for the generation of spatial curvature
perturbations. Within a small fraction of the Hubble time inflation is
terminated by a transition of the theory to its center symmetric phase. The
spontaneously broken $Z_{N+1}$ symmetry stabilizes relic vector bosons in the
epochs following inflation. These heavy relics contribute to the cold dark
matter of the universe and potentially originate the UHECRs beyond the GZK
bound.


title: Diffractive Dijet Production

abstract:
  We explore the diffractive interaction of a proton with an anti-proton which
results in centrally produced dijets. This process has been recently studied at
the Tevatron. We make predictions within an Ingelman-Schlein approach and
compare them to the recent data presented by the CDF collaboration. Earlier
calculations resulted in theoretical cross-sections which are much larger than
those observed by CDF. We find that, after consideration of hadronisation
effects and the parton shower, and using parton density functions extracted
from diffractive deep inelastic scattering at HERA, it is possible to explain
the CDF data. We need to assume a gap survival probability of around 10% and
this is in good agreement with the value predicted by theory. We also find that
the non-diffractive contribution to the process is probably significant in the
kinematical region probed by the Tevatron.


title:
Prospects for New Physics observations in diffractive processes at the
  LHC and Tevatron

abstract:
  We study the double-diffractive production of various heavy systems (e.g.
Higgs, dijet, t tbar and SUSY particles) at LHC and Tevatron collider energies.
In each case we compute the probability that the rapidity gaps, which occur on
either side of the produced system, survive the effects of soft rescattering
and QCD bremsstrahlung effects. We calculate both the luminosity for different
production mechanisms, and a wide variety of subprocess cross sections. The
results allow numerical predictions to be readily made for the cross sections
of all these processes at the LHC and the Tevatron collider. For example, we
predict that the cross section for the exclusive double-diffractive production
of a 120 GeV Higgs boson at the LHC is about 3 fb, and that the QCD background
in the b bbar decay mode is about 4 times smaller than the Higgs signal if the
experimental missing-mass resolution is 1 GeV. For completeness we also discuss
production via gamma gamma or WW fusion.


title:
U-70 Proton Synchrotron Extracted Beam Lines Control System
  Modernization

abstract:
  A 70 GeV Proton Synchrotron Extracted Beam Lines Control System is described.
About 130 Magnet Dipoles and Quadrupoles, 20 Correction Magnets, 50 Beam
Collimators, BPM equipment spread over 1 Km have to be controlled. The old
System was based on the PDP-11/40 and LSI-11 compatible computers and the MIL
1553 STD as a Field Bus. It successfully operated about 15 years. A new system
includes home made Equipment Controllers based on I 8051 Processors, CAN Field
Bus, FECs, Servers, Consoles connected by Ethernet. On the first stage of
modernization PDPs and LSIs are replaced with PCs connected by Ethernet.
Equipment controllers are being successfully tested in the Collimators and
Corrector Magnets Controls during a run.


title:
Early Universe Cosmology and Tests of Fundamental Physics: Report of the
  P4.8 Working Subgroup, Snowmass 2001

abstract:
  This is the report of the {\em Working Group on Early Universe Cosmology and
Tests of Fundamental Physics}, group P4.8 of the of the Snowmass 2001
conference. Here we summarize the impressive array of advances that have taken
place in this field, and identify opportunities for even greater progress in
the future. Topics include Dark Energy, Cosmic Acceleration, Inflation, Phase
Transitions, Baryogenesis, and String/M-theory Cosmology. The introductory
section gives an executive summary with six key open questions on which we can
expect to make significant progress.


title: $\tau$ magnetic moment in a $\gamma \gamma$ collider

abstract:
  We analyze different observables to study the magnetic dipole moment of the
tau pairs produced by photon linear colliders. We use the circular polarized
photon beam and study distributions of polarized $\tau$ final pairs to define
sensibly asymmetries to magnetic dipole moment.


title: Masses of the 70- Baryons in Large Nc QCD

abstract:
  The masses of the negative parity 70-plet baryons are analyzed in large N_c
QCD to order 1/N_c and to first order in SU(3) symmetry breaking. The existing
experimental data are well reproduced and twenty new observables are predicted.
The leading order SU(6) spin-flavor symmetry breaking is small and, as it
occurs in the quark model, the subleading in 1/N_c hyperfine interaction is the
dominant source of the breaking. It is found that the Lambda(1405) and
Lambda(1520) are well described as three-quark states and spin-orbit partners.
New relations between splittings in different SU(3) multiplets are found.


title: Muon anomalous magnetic moment constrains models with excited leptons

abstract:
  We explore the possibility of the existence of excited leptons in the light
of recent data on muon $g - 2$ from BNL. We have been able to put stringent
bounds on the relevant parameter space.


title: Two-Loop Self-Energy Corrections to the Fine-Structure

abstract:
  We investigate two-loop higher-order binding corrections to the fine
structure, which contribute to the spin-dependent part of the Lamb shift. Our
calculation focuses on the so-called ``two-loop self-energy'' involving two
virtual closed photon loops. For bound states, this correction has proven to be
notoriously difficult to evaluate. The calculation of the binding corrections
to the bound-state two-loop self-energy is simplified by a separate treatment
of hard and soft virtual photons. The two photon-energy scales are matched at
the end of the calculation. We explain the significance of the mathematical
methods employed in the calculation in a more general context, and present
results for the fine-structure difference of the two-loop self-energy through
the order of $\alpha^8$.


title: Charge and Color Breaking and D-terms in String Theory

abstract:
  In four dimensional superstring models, the gauge group normally contains
extra U(1)s that are broken at a high energy scale. We show that the presence
of the extra U(1)s is crucial for the phenomenological viability of string
scenarios, since the contribution to the scalar masses from the D-terms can
lift the unbounded from below directions that usually appear when the gauge
group at high energies is just the Standard Model group. In particular, we show
that the dilaton dominated scenario can be allowed in large regions of the
parameter space if there exists an anomalous U(1) in the theory, and the
charges of the particles are the appropriate ones. We also analyze the
parameter space of some explicit string constructions, imposing a correct
phenomenology and the absence of dangerous charge and color breaking minima or
unbounded from below directions.


title: Quintessence Cosmology and Varying $\alpha$

abstract:
  If the reported measurements of the time variation of the fine structure
constant from observations of distant QSOs are correct, combined with the Oklo
limit they would strongly constrain the class of the quintessence potential. If
these results prove valid, future satellite experiment (STEP) should measure
the induced violation of the weak equivalence principle. Future cosmological
observations of nearby $(z \siml 0.5)$ absorption systems would make it clear
whether the variation is significant or not.


title: Couplings between pion and charmed mesons

abstract:
  We compute the couplings $DD^*\pi$,$D_1D^*\pi$,$D^*D^*\pi$, $D_1 D_1\pi$
using QCD sum rules. These couplings are important inputs in the meson exchange
model calculations used to estimate the amount of $J/\psi$ absorption due to
pions and rho mesons in heavy ion collisions. Our sum rules are constructed at
the first order in the pion momentum $p_\mu$, which give the couplings that are
not trivially related to the soft-pion theorem. Our calculated couplings, which
somewhat depend upon the values of the heavy meson decay constants, are
$g_{DD^*\pi}=8.2 \pm 0.1$, $g_{D_1 D^* \pi} = 15.8 \pm 2 {\rm GeV}$, $g_{D^*
D^* \pi}= 0.3 \pm 0.03$ and $g_{D_1 D_1 \pi}= 0.17 \pm 0.04$.


title: Theoretical developments on Quartic Gauge Boson Couplings at LEP

abstract:
  The search for quartic anomalous gauge couplings (QAGC) at LEP requires
appropriate predictions for the radiative processes e+ e- \to \nu\bar\nu
\gamma\gamma, e+ e- \to q\bar{q}\gamma\gamma and e+ e- \to 4 fermions+\gamma.
The current knowledge on dimension-six operators giving rise to QAGC is briefly
reviewed, together with their implementation in event generators. The accuracy
of calculations based on real approximations (used up to now for the LEP
experimental analysis) is examined by comparing them with the available exact
matrix element calculations.


title: Leptogenesis at the TeV scale

abstract:
  We present a general description of the problems encountered when attempting
to build a simple model of leptogenesis and hence of baryogenesis at an energy
scale as low as 1-10 TeV. We consider three possible lepton asymmetry
enhancement mechanisms in the out-of-equilibrium decay scenario, emphasizing
the three body decay mechanism as most natural. A new model based on the three
body decays of right-handed neutrinos is proposed. It naturally allows both
leptogenesis and neutrino mass generation at low scale. Also discussed is the
possibility of inducing leptogenesis at low scale in existing neutrino mass
models: Fukugita-Yanagida model, Higgs triplet model, Zee model and models with
R-parity violation.


title: Hard colour singlet exchange and gaps between jets at the Tevatron

abstract:
  The new kind of events with a rapidity gap between two high-E_T jets,
observed in high energy ppbar collisions at the Tevatron, is found to be well
described by the exchange of a colour singlet gluon system in the BFKL
framework. This requires going beyond the conventional asymptotic Mueller-Tang
approximation, which results in qualitatively different features of the basic
parton-parton scattering amplitude. Non-leading corrections to the BFKL
equation are included by incorporation of the consistency constraint and the
running QCD coupling. Hadronisation and other non-perturbative QCD effects are
treated through a complete Monte Carlo simulation, providing a gap survival
probability that varies event-by-event, facilitating comparison with
experimental results.


title: Pion Form Factor and Quark Mass Evolution in a Light-Front Quark Model

abstract:
  We discuss the soft contribution to the elastic pion form factor with the
mass evolution from current to constituent quark being taken into account in a
light-front quark model(LFQM).


title: Non-Perturbative High-Energy QCD

abstract:
  It is the aim of this talk to review our understanding of the high-energy
limit of QCD, focussing, in particular, on recent theoretical developments.
After a brief introduction, I will recall why the true high-energy limit of QCD
scattering processes is genuinly non-perturbative and why it has so far not
been possible to apply lattice methods to this type of physics. Given the
experimental fact of slowly rising hadronic cross sections, we are thus faced
with a fundamental problem comparable to that of confinement but without the
promise of the lattice. During the last years, the experimental side of this
field has largely been driven by the HERA accelerator, which has, naturally,
also influenced recent theoretical work in high-energy QCD. I will therefore
devote the second part of the talk to small-x deep inelastic scattering, in
particular the physics of diffraction, and attempt to describe its impact on
the wider field of non-perturbative high-energy QCD.


title:
Unitarity Corrections to the Proton Structure Functions through the
  Dipole Picture

abstract:
  We study the dipole picture for the description of the deep inelastic
scattering, focusing on the structure functions which are driven directly by
the gluon distribution. One performs estimates using the effective dipole cross
section given by the Glauber-Mueller approach in QCD, which encodes the
corrections due to the unitarity effects associated with the saturation
phenomenon. We also address issues about frame invariance of the calculations
when analysing the observables.


title: B -> J/psi K^* Decays in QCD Factorization

abstract:
  The hadronic decay B -> J K^* is analyzed within the framework of QCD
factorization. The spin amplitudes A_0, A_\parallel and A_\perp in the
transversity basis and their relative phases are studied using various
different form-factor models for B-K^* transition. The effective parameters
a_2^h for helicity h=0,+,- states receive different nonfactorizable
contributions and hence they are helicity dependent, contrary to naive
factorization where a_2^h are universal and polarization independent. QCD
factorization breaks down even at the twist-2 level for transverse hard
spectator interactions. Although a nontrivial strong phase for the A_\parallel
amplitude can be achieved by adjusting the phase of an infrared divergent
contribution, the present QCD factorization calculation cannot say anything
definite about the phase phi_\parallel. Unlike B -> J/psi K decays, the
longitudinal parameter a_2^0 for B -> J/psi K^* does not receive twist-3
corrections and is not large enough to account for the observed branching ratio
and the fraction of longitudinal polarization. Possible enhancement mechanisms
for a_2^0 are discussed.


title: A Determination of the Nucleon Tensor Charge

abstract:
  Exploiting an approximate phenomenological symmetry of the $J^{PC}=1^{+-}$
light axial vector mesons and using pole dominance, we calculate the flavor
contributions to the nucleon tensor charge. The result depends on the decay
constants of the axial vector mesons and their couplings to the nucleons.


title:
Statistical J/psi production and open charm enhancement in Pb+Pb
  collisions at CERN SPS

abstract:
  Production of open and hidden charm hadrons in heavy ion collisions is
considered within the statistical coalescence model. Charmed quarks and
antiquarks are assumed to be created at the initial stage of the reaction and
their number is conserved during the evolution of the system. They are
distributed among open and hidden charm hadrons at the hadronization stage in
accordance with laws of statistical mechanics. The model is in excellent
agreement with the experimental data on J/psi production in lead-lead
collisions at CERN SPS and predicts strong enhancement of the open charm
multiplicity over the standard extrapolation from nucleon-nucleon to
nucleus-nucleus collisions. A possible mechanism of the charm enhancement is
proposed.


title: Strangeness and charm signatures in A+A collisions

abstract:
  Two signatures of the quark-gluon plasma - strangeness `enhancement' and
J/psi `suppression' - in nucleus-nucleus collisions are critically discussed. A
recently developed statistical coalescence model for J/\psi production is
presented. The measurements at the RHIC energies are crucial for disentangling
the different scenarios of J/\psi formation.


title: Relativistic Massive Vector Condensation

abstract:
  At sufficiently high chemical potential massive relativistic spin one fields
condense. This phenomenon leads to the spontaneous breaking of rotational
invariance while linking it to the breaking of internal symmetries. We study
the relevant features of the phase transition and the properties of the
generated Goldstone excitations. The interplay between the internal symmetry of
the vector fields and their Lorentz properties is studied. We predict that new
phases set in when vectors condense in Quantum Chromodynamics like theories.


title:
More remarks on suppression of large black hole production in particle
  collisions

abstract:
  The problem of evaluating the cross section of production of large black
holes in particle collisions at trans-Planckian energies is revisited. It is
argued that the geometric cross section claimed in the literature would in fact
lead to an exponentially growing with energy total cross section dominated by
production of many "small" black holes. On the other hand, the semiclassical
treatment of this problem, leading to an exponentially suppressed cross section
for production of large black holes, requires that in the classical limit the
cross section vanishes for massless colliding particles. The latter behavior
can in principle be probed by numerical simulations in the classical general
relativity.


title: Pion Propagation near the QCD Chiral Phase Transition

abstract:
  We point out that, in analogy with spin waves in antiferromagnets, all
parameters describing the real-time propagation of soft pions at temperatures
below the QCD chiral phase transition can be expressed in terms of static
correlators. This allows, in principle, the determination of the soft pion
dispersion relation on the lattice. Using scaling and universality arguments,
we determine the critical behavior of the parameters of pion propagation. We
predict that when the critical temperature is approached from below, the pole
mass of the pion drops despite the growth of the pion screening mass. This fact
is attributed to the decrease of the pion velocity near the phase transition.


title: Branes and Inflationary Cosmology

abstract:
  We discuss a brane based inflationary scenario in which an initially
non-supersymmetric configuration involving a D4 brane is dynamically
transformed into a supersymmteric one in a background space-time geometry
determined by a stack of D6 branes. Inflation is realized in the effective four
dimensional theory and ends after reaching a stable BPS configuration. The
scalar spectral index turns out to be 0.98. Under some simplifying assumption
the reheat temperature, Hubble constant and the string scale are estimated to
be of order $10^{8}$ GeV, $10^{12}$ GeV and $10^{16}$ GeV, respectively.


title: Radiative (phi -> f_0(980) gamma) decay in light cone QCD sum rules

abstract:
  The light cone QCD sum rules method is used to calculate the transition form
factor for the radiative (phi -> f_0 gamma) decay, assuming that the quark
content of the (f_0) meson is pure (bar{s}s) state. The branching ratio is
estimated to be Br(phi -> f_0 gamma) = 3.5 x (1 pm 0.3) x 10^(-4). A comparison
of our prediction on branching ratio with the theoretical results and
experimental data existing in literature is presented.


title: Traces of the tricritical point on the QCD phase diagram

abstract: This paper has been withdrawn by the author.


title: Photon Propagation in a Magnetized Medium

abstract:
  Using the real time formalism of the finite temperature field theory we
calculate the 1-loop polarization tensor in the presence of a background
magnetic field in a medium. The expression is obtained to linear order in the
background field strength. We discuss the Faraday rotation as well as the
photon absorption probabilities in this context.


title: The heavy-to-light transitions in the light-cone QCD sum rules

abstract:
  We have analyzed the $B\to \pi $ and $B_{s}\to K$ semileptonic form factors
and $B\to V\gamma (V=K^*,\rho,\omega)$ processes in the light-cone QCD sum
rules. In order to enhance the predictivity and reliability of numerical
results the chiral-current correlator is employed and the twist-3 light-cone
wavefunction can be effectively eliminated from the sum rules.


title:
Constraining R-parity violating couplings from B --> PP decays using QCD
  improved factorization method

abstract:
  We investigate the role of R-parity violating interaction in the non-leptonic
decays of B mesons into two light mesons B --> PP. The decay amplitudes are
calculated using the QCD improved factorization method. Using the combined data
on B decays from BaBar, Belle and CLEO, we obtain strong constraints on the
various products of R-parity violating couplings. Many of these new constraints
are stronger than the existing bounds.


title: Photon Emission from Quark-Gluon Plasma: Complete Leading Order Results

abstract:
  We compute the photon emission rate of an equilibrated, hot QCD plasma at
zero chemical potential, to leading order in both alpha_{EM} and the QCD
coupling g_s(T). This requires inclusion of near-collinear bremsstrahlung and
inelastic pair annihilation contributions, and correct incorporation of
Landau-Pomeranchuk-Migdal suppression effects for these processes. Analogous
results for a QED plasma are also included.


title:
Analytical calculation of matter effects in two mass-scale neutrino
  oscillations

abstract:
  We consider three active flavor neutrino oscillations where both the
mass-square differences play a role in atmospheric neutrino problem. We
calculate the matter effects arising due to propagation through earth. We
demonstrate that these effects improve the fit to the electron data vis-a-vis
vacuum oscillations but make the fit to the muon data far worse, thus worsening
the overall fit. The results of our analytical calculation verify the numerical
investigations of this scheme presented earlier by Fogli et al.


title: Towards Collinear Evolution Equations in Electroweak Theory

abstract:
  We consider electroweak radiative corrections to hard inclusive processes at
the TeV scale, and we investigate how collinear logarithms factorize in a
spontaneously broken gauge theory, similarly to the DGLAP analysis in QCD.
  Due to the uncancelled double logs noticed previously, we find a
factorization pattern which is qualitatively different from the analogous one
in QCD. New types of splitting functions emerge which are needed to describe
the initial beam charges and are infrared-sensitive, that is dependent on an
infrared cutoff provided, ultimately, by the symmetry breaking scale. We derive
such splitting functions at one-loop level in the example of SU(2) gauge
theory, and we also discuss the structure functions' evolution equations, under
the assumption that isospin breaking terms present in the Ward identities of
the theory are sufficiently subleading at higher orders.


title: Possible Evidence for a Chiral Axial-Vector State in the D Meson System

abstract:
  We reanalyze the D^{*+} pi^- mass spectrum from CLEO II by the VMW method in
order to examine the existence of a chiral axial-vector state, which is
predicted in a covariant level-classification scheme recently proposed, other
than normal orbitally-excited P-wave states in the D meson system. A result of
the present analysis seems to suggest that there exists an extra axial-vector
meson, in addition to the two normal ones, in a similar mass region.


title: Quark masses and weak couplings in the Standard Model and beyond

abstract:
  I discuss two topics: i) the empirical adequacy of the Standard Model in the
Flavour Sector in view of recent data; ii) the possible existence of a hidden
structure in the quark masses and mixings based on textures.


title: Possible detection of relic neutrinos and their mass

abstract:
  Recently the possibility was widely discussed that a large fraction of the
highest energy cosmic rays may be decay products of Z bosons which were
produced in the resonant annihilation of ultrahigh energy cosmic neutrinos on
cosmological relic neutrinos. If one takes this so-called Z-burst scenario
seriously, one may infer the mass of the heaviest relic neutrino as well as the
necessary ultrahigh energy cosmic neutrino flux from a comparison of the
predicted Z-burst spectrum with the observed cosmic ray spectrum.


title: A remark on non-Abelian classical kinetic theory

abstract:
  It is known that non-Abelian classical kinetic theory reproduces the Hard
Thermal/Dense Loop (HTL/HDL) effective action of QCD, obtained after
integrating out the hardest momentum scales from the system, as well as the
first higher dimensional operator beyond the HTL/HDL level. We discuss here its
applicability at still higher orders, by comparing the exact classical
effective action obtained in the static limit, with the 1-loop quantum
effective potential. We remark that while correct types of operators arise, the
classical colour algebra reproduces correctly the prefactor of the 4-point
function $tr A_0^4$ only for matter in asymptotically high dimensional colour
representations.


title: Direct Photons from Relativistic Heavy-Ion Collisions

abstract:
  Direct photons have been proposed as a promising signature for the
quark-gluon plasma (QGP) formation in relativistic heavy-ion collisions.
Recently WA98 presented the first data on direct photons in Pb+Pb-collisions at
SPS. At the same time RHIC started with its experimental program. The discovery
of the QGP in these experiments relies on a comparison of data with theoretical
predictions for QGP signals. In the case of direct photons new results for the
production rates of thermal photons from the QGP and a hot hadron gas as well
as for prompt photons from initial hard parton scatterings have been proposed
recently. Based on these rates a variety of different hydrodynamic models,
describing the space-time evolution of the fireball, have been adopted for
calculating the direct photon spectra. The results have been compared to the
WA98 data and predictions for RHIC and LHC have been made. So far the
conclusions of the various models are controversial.
  The aim of the present review is to provide a comprehensive and up-to-date
survey and status report on the experimental and theoretical aspects of direct
photons in relativistic heavy-ion collisions.


title: The Standard Model on Non-Commutative Space-Time

abstract:
  We consider the Standard Model on a non-commutative space and expand the
action in the non-commutativity parameter theta. No new particles are
introduced, the structure group is SU(3) x SU(2) x U(1). We derive the leading
order action. At zeroth order the action coincides with the ordinary Standard
Model. At leading order in theta we find new vertices which are absent in the
Standard Model on commutative space-time. The most striking features are
couplings between quarks, gluons and electroweak bosons and many new vertices
in the charged and neutral currents. We find that parity is violated in
non-commutative QCD. The Higgs mechanism can be applied. QED is not deformed in
the minimal version of the NCSM to the order considered.


title: Baryogenesis: The Lepton Leaking Mechanism

abstract:
  We propose a baryo- and leptogenesis mechanism in which the B-L asymmetry is
produced in the conversion of ordinary leptons into particles of some depleted
hidden sector. In particular, we consider the lepton number violating
reactions, l Higgs -> l' Higgs', \bar{l'} \bar{Higgs'}, mediated by the heavy
Majorana neutrinos N of the seesaw mechanism, where l and Higgs are ordinary
lepton and Higgs doublets and l', Higgs' the ``sterile'' leptons and Higgs.
This mechanism can operate even if the reheat temperature is smaller than the N
Majorana masses, in which case the usual leptogenesis mechanism through N
decays is ineffective. In particular, the reheat tempearture can be as low as
10^9 GeV or less.


title:
Radiative corrections to the semileptonic Dalitz plot with angular
  correlation between polarized decaying and emitted hyperons: effects of the
  four-body region

abstract:
  We obtain a model-independent expression for the complete Dalitz plot of
semileptonic decays of polarized hyperons, which includes both the three-body
and the four-body regions. We calculate radiative corrections to order alpha,
neglecting terms of order alpha q/(pi M_1), where q is the four-momentum
transfer and M_1 is the mass of the decaying hyperon. Our results exhibit
explicitly the correlation between the emitted hyperon three-momentum and the
spin of the decaying hyperon. This allows us to obtain the corresponding
radiative corrections to the integrated emitted hyperon spin-asymmetry
coefficient. Our formulas are valid for charged as well as for neutral decaying
hyperons and are appropriate for model-independent experimental analysis
whether the real photon is discriminated or not.


title:
Long-distance contribution to the muon-polarization asymmetry in K^+\to
  \pi^+ \mu \mu

abstract:
  We revisit the calculation of the long-distance contribution to the
muon-polarization asymmetry \Delta_{LR}, which arises, in
K^+\to\pi^+\mu^+\mu^-, from the two-photon intermediate state. The
parity-violating amplitude of this process, induced by the local anomalous
K^+\pi^-\gamma^*\gamma^* transition, is analysed; unfortunately, one cannot
expect to predict its contribution to the asymmetry by using chiral
perturbation theory alone. Here we evaluate this amplitude and its contribution
to \Delta_{LR} by employing a phenomenological model called the FMV model, in
which the utility of the vector and axial-vector resonances exchange is
important to soften the ultraviolet behaviour of the transition. We find that
the long-distance contribution is of the same order of magnitude as the
standard model short-distance contribution.


title: Wave functions and spectra from (S)DLCQ

abstract:
  Applications of discretized light-cone quantization (DLCQ) to
(3+1)-dimensional Yukawa theory with Pauli-Villars regulators and of
supersymmetric DLCQ (SDLCQ) to (2+1)-dimensional super Yang-Mills theory are
discussed. The ability of these methods to provide wave functions as well as
spectra is emphasized.


title: Vector Manifestation and Fate of Vector Mesons in Dense Matter

abstract:
  We describe in-medium properties of hadrons in dense matter near chiral
restoration using a Wilsonian matching to QCD of an effective field theory with
hidden local symmetry at the chiral cutoff $\Lambda$. We find that chiral
symmetry is restored in vector manifestation \`a la Harada and Yamawaki at a
critical matter density $n_c$. We express the critical density in terms of QCD
correlators in dense matter at the matching scale. In a manner completely
analogous to what happens at the critical $N_f^c$ and at the critical
temperature $T^c$, the vector meson mass is found to vanish (in the chiral
limit) at chiral restoration. This result provides a support for Brown-Rho
scaling predicted a decade ago.


title: The Sigma Meson and Chiral Transition in Hot and Dense Matter

abstract:
  It is pointed out that the hadron spectroscopy should be a study of the
structure of the QCD vacuum, low-energy elementary excitations on top of which
are hadrons. Concentrating on the dynamical breaking of the chiral symmetry in
the QCD vacuum, we emphasize the importance to clarify what is going on with
mesons in the $I=J=0$-channel, i.e., the sigma meson channel, because it is
connected to the quantum fluctuations of the chiral order parameter. After
summarizing the significance of the sigma meson in QCD and low-energy hadron
phenomenology, we give a review on some theoretical and experimental effort to
try to reveal the possible restoration of chiral symmetry in hot and dense
nuclear matter including heavy nuclei.


title:
V_{ub}, V_{cb} and Decay Constants in Effective Field Theory of Heavy
  Quarks

abstract:
  A new framework of heavy quark effective field theory (HQEFT) is studied and
compared with the usual heavy quark effective theory (HQET). $|V_{ub}|$,
$|V_{cb}|$ and heavy meson decay constants are extracted in the new framework.
HQEFT can yield reasonable results for both exclusive and inclusive decays.


title:
High-precision e-expansions of three-loop master integrals contributing
  to the electron g-2 in QED

abstract:
  In this paper we calculate at high-precision the Laurent expansions in
e=(4-D)/2 of the 17 master integrals which appeared in the analytical
calculation of 3-loop QED contribution to the electron g-2, using difference
and differential equations. The coefficients of the expansions so obtained are
in perfect agreement with all the analytical expressions already known. The
values of coefficients not previously known will be used in the high-precision
calculation of the 4-loop QED contribution to the electron g-2.


title:
Supersymmetric Electroweak Corrections to the Chargino Decay into
  Neutralino and W Boson

abstract:
  We investigated the electroweak corrections from one-loop diagrams involving
the third generation (s)quarks to the decay width of process $\tilde{\chi}_1^+
\to W^+ \tilde{\chi}_1^{0}$ in the framework of the Minimal Supersymmetric
Standard Model. Our calculation shows that these corrections are not very
sensitive to the mass of the lightest neutralino $\tilde{\chi}_1^{0}$ and the
sbottom mixing angle $\theta_{b}$, but depend strongly on the top squark mixing
angle $\theta_{t}$ and tan$\beta$. With our chosen parameters, we find that
these radiative corrections can exceed 10%, therefore they should be taken into
account for the precise experimental measurement at future colliders.


title: Dimensional Reduction over Coset Spaces and Supersymmetry Breaking

abstract:
  We address the question of supersymmetry breaking of a higher dimensional
supersymmetric theory due to coset space dimensional reduction. In particular
we study a ten-dimensional supersymmetric $E_{8}$ gauge theory which is reduced
over all six-dimensional coset spaces. We find that the original supersymmetry
is completely broken in the process of dimensional reduction when the coset
spaces are symmetric. On the contrary softly broken four-dimensional
supersymmetric theories result when the coset spaces are non-symmetric. From
our analysis two promising cases are emerging which lead to interesting GUTs
with three fermion families in four dimensions, one being non-supersymmetric
and the other softly broken supersymmetric.


title:
Constraining the primordial spectrum of metric perturbations from
  gravitino and moduli production

abstract:
  We consider the production of gravitinos and moduli fields from quantum
vacuum fluctuations induced by the presence of scalar metric perturbations at
the end of inflation. We obtain the corresponding occupation numbers, up to
first order in perturbation theory, in terms of the power spectrum of the
metric perturbations. We compute the limits imposed by nucleosynthesis on the
spectral index $n_s$ for different models with constant $n_s$. The results show
that, in certain cases, such limits can be as strong as $n_s<1.12$, which is
more stringent than those coming from primordial black hole production.


title: Perspectives and Challenges for QCD Phenomenology

abstract:
  A fundamental understanding of quantum chromodynamics, particularly at the
amplitude level, is essential for progress in high energy physics. For example,
the measurement and interpretation of the basic parameters of the electroweak
theory and CP violation depends on an understanding of the dynamics and phase
structure of exclusive B-meson decay amplitudes. In this review, I discuss a
number of ways in which the required hadron wavefunctions can be measured (such
as two-photon reactions and diffractive dissociation) or calculated from first
principles. An important tool for describing relativistic composite systems in
quantum field theory is the light-front Fock expansion, which encodes the
properties of a hadrons in terms of a set of frame-independent n-particle
wavefunctions. Evolution in light-cone time allows the construction of an
"event amplitude generator" in which only non-ghost physical degrees of freedom
and integration over physical phase appear. The diffractive dissociation of a
hadron at high energies, by either Coulomb or Pomeron exchange, has a natural
description in QCD as the materialization of the projectile's light-cone
wavefunctions; in particular, the diffractive dissociation of a meson, baryon,
or photon into high transverse momentum jets measures the shape and other
features of the projectile's distribution amplitude. I also review recent work
which shows that the structure functions measured in deep inelastic lepton
scattering are affected by final-state rescattering, thus modifying their
connection with the light-cone probability distributions. In particular, the
shadowing of nuclear structure functions is due to destructive interference
effects from leading-twist diffraction of the virtual photon, physics not
included in the nuclear light-cone wavefunctions.


title:
Universal scaling behaviour of the transverse polarization for
  inclusively produced hyperons in hadron-hadron collisions

abstract:
  Experimental data on the polarization of hyperons, inclusively produced in
hadron-hadron collisions, have been analyzed. It is shown that the existing
data can be described by a function of transverse momentum (Pt) and two scaling
variables Xa+-=(Xr +- Xf)/2: P_H=A^alpha*F(Pt)[G(Xa+ -x2) -sigma*G(Xa- +x2)].
The function G(x) is proportional to sin[omega*(x -x1)]/omega, which results
for some reactions in an oscillation of P_H as a function of Xf. The "omega",
as well as the magnitude and the sign of the hyperon polarization depend on
quark composition of hadrons participating in a reaction. The atomic weight
dependence of the Lambda hyperon polarization is characterized by the parameter
alpha = -0.16|Xf|. There is an analogy between the scaling properties of the
hyperon polarization and the analyzing power (An) in hadron production
reactions. This new scaling law allows one to predict hyperon polarization for
reactions and kinematic regions, yet unexplored in experiments and to confront
these predictions with future experiments and various models.


title: Charm Antiquark and Charm Quark in the Nucleon

abstract:
  We estimate the intrinsic charm contributions to the quark flavor and spin
observables of the nucleon in the SU(4) quark meson fluctuation model. In this
model, the charm or anticharm reside in the charmed mesons created by the
nonperturbative quantum quark-meson fluctuations. The intrinsic charm content
in the proton, $2\bar c/\sum(q+\bar q) \simeq 0.011\pm 0.008$, is almost one
order of magnitude smaller than the intrinsic strange content. The intrinsic
charm helicity is also small and negative, $\Delta c\simeq -(0.009\pm 0.006)$.
The fraction of the total quark helicity carried by the charm is $|\Delta
c/\Delta \Sigma|\simeq 0.021\pm 0.014$. The ratio of the charm with positive
helicity to that with negative helicity is $c_\up/c_\dw=35/67$. For the
intrinsic strange component, one has $s_\up/s_\dw\simeq 7/13$. A detail
comparison of our predictions with data and other models or analyses is given.
The intrinsic charm contribution to the Ellis-Jaffe sum rule is also discussed.


title:
CP Trajectory Diagram; A tool for pictorial representation of CP and
  matter effects in neutrino oscillations

abstract:
  We introduce "CP trajectory diagram in bi-probability space" as a powerful
tool for pictorial representation of the genuine CP and the matter effects in
neutrino oscillations. Existence of the correlated ambiguity in a determination
of CP violating phase \delta and the sign of \Delta m^2_{13} is uncovered.
Principles of tuning beam energy for a given baseline distance are proposed to
resolve the ambiguity and to maximize the CP-odd effect. We finally point out,
quite contrary to what is usually believed, that the ambiguity may be resolved
with 50 % chance in the super-JHF experiment despite its relatively short
baseline of 300 km.


title: CERN to Gran Sasso; An ideal distance for superbeam?

abstract:
  We use the CP trajectory diagram as a tool for pictorial representation of
the genuine CP and the matter effects to explore the possibility of an in situ
simultaneous measurement of \delta and the sign of \Delta m^2_{13}. We end up
with a low-energy conventional superbeam experiment with a megaton-class water
Cherenkov detector and baseline length of about 700 km. A picturesque
description of the combined ambiguity which may arise in simultaneous
determination of \theta_{13} and the above two quantities is given in terms of
CP trajectory diagram.


title: Quarkonium-hadron interactions in QCD

abstract:
  The leading order non-relativistic QCD result for the quarkonium-hadron
interaction cross section is derived by using the QCD factorization formula
combined with the Bethe-Salpeter amplitude for the heavy quark bound state. Our
result shows the equivalence of this approach with the operator product
expansion even for the bound state scattering to leading order in QCD. We also
apply the formula to the charmonium system and investigate the relativistic
correction coming from the phase space of the reaction. We find that although
$J/\psi$-gluon cross-section gets a large relativistic correction at higher
energies, the correction becomes small in the $J/\psi$-hadron cross section due
to the increase of the gluon distribution at smaller $x$ inside the hadron.


title: Viability of bi-maximal solution of the Zee mass matrix

abstract:
  We know $L_e-L_\mu-L_\tau$ symmetry gives $m^2_1= m^2_2 >> m^2_3$ pattern in
Zee model. $\Delta m^2_\odot$ emerges from a small breaking of this symmetry.
Because this symmetry is broken very weakly $\theta_\odot$ does not deviate
much from $\tan^2 \theta_\odot=1$ which is its value in the symmetric limit.
This gives a mismatch with LMA solution where mixing is large but not exactly
maximal. We confront this property of Zee mass matrix by phenomenologically
analyzing recent results from solar and atmospheric neutrino oscillation
experiments at various confidence levels. We conclude that LOW type solution is
compatible with the Zee mass matrix at 99% confidence level when atmospheric
neutrino deficit is explained by maximal $\nu_\mu \leftrightarrow \nu_\tau$
oscillation. Thus the minimal version of the Zee model even though disfavored
by the LMA type or VO type solutions, is compatible with LOW type solution of
solar neutrino problem.


title: Lepton Spectra from e^+ e^- \to W^+ W^- in the BESS model

abstract:
  We investigate the reaction e^+ e^- \to W^+ W^-, W^- \to l^- \bar{nu} in a
strong coupling scenario as implemented in the BESS model. Energy and angle
spectra of the secondary lepton are calculated and compared with the
predictions of the Standard Model. These spectra provide a determination of the
fraction f_0 of longitudinally polarized W's, and the backward fraction of
secondary leptons, f_{back}. Assuming BESS parameters allowed by present data,
we give numerical estimates of the effects to be expected at an e^+e^- collider
of energy \sqrt{s} = 500- 800 GeV.


title:
Anomalous diffusion in non-equilibrium relativistic heavy-ion rapidity
  spectra

abstract:
  There is experimental and theoretical evidence that the broad rapidity
distribution of net proton yield in central heavy-ion collisions at SPS
energies could be a signal of non-equilibrium properties of the system. We show
that the broad rapidity shape can be well reproduced in the framework of a
non-linear relativistic Fokker-Planck dynamics which incorporates non-extensive
statistics and anomalous diffusion.


title: Renormalized QCD-inspired model for the pion and mesons

abstract:
  We apply the subtraction method to an effective QCD-inspired model, which
includes the Coulomb plus a zero-range hyperfine interactions, to define a
renormalized Hamiltonian for mesons. The spectrum of the renormalized
Hamiltonian agrees with the one obtained with a smeared hyperfine interaction.
The masses of the low-lying pseudo scalar and vector mesons are reasonably
described within the model.


title:
Limits on the Non-Standard Interactions of Neutrinos from $e^+ e^-$
  Colliders

abstract:
  We provide an effective Lagrangian analysis of contact non-standard
interactions of neutrinos with electrons, which can be effectively mediated by
extra particles, and examine the associated experimental limits. At present,
such interactions are strongly constrained only for $\nu_\mu$: the bounds are
loose for $\nu_e$ and absent for $\nu_\tau$. We emphasize the unique role
played by the reaction $e^+e^-\to \nu \bar{\nu}\gamma$ in providing direct
constraints on such non-standard interactions.


title: Probing Non-Standard Couplings of Neutrinos at the Borexino Detector

abstract:
  The present experimental status does not exclude weak-strength non-standard
interactions of neutrinos with electrons. These interactions can be revealed in
solar neutrino experiments. Our discussion covers several aspects related to
this issue. First, we perform an analysis of the Super Kamiokande and SNO data
to investigate their sensitivity to such interactions. In particular, we show
that the \nu_e oscillation into sterile neutrinos can be still allowed if \nu_e
has extra interactions of the proper strength. Second, we suggest that the
Borexino detector can provide good signatures for these non-standard
interactions. Indeed, in Borexino the shape of the recoil electron spectrum
from the \nu e \to \nu e scattering essentially does not depend on the solar
neutrino conversion details, since most of the signal comes from the
mono-energetic ^7Be neutrinos. Hence, the partial conversion of solar \nu_e
into a a nearly equal mixture of \nu_\mu and \nu_\tau, as is indicated by the
atmospheric neutrino data, offers the chance to test extra interactions of
\nu_\tau, or of \nu_e itself.


title:
Simple solutions of fireball hydrodynamics for self-similar, ellipsoidal
  flows

abstract:
  A new family of simple, analytic solutions of self-similarly expanding
fireballs is found for systems with ellipsoidal symmetry and a direction
dependent, generalized Hubble flow. Gaussian, shell like or oscillating density
profiles emerge for simple choices of an arbitrary scaling function. New,
cylindrically or spherically symmetric as well as approximately one dimensional
hydrodynamical solutions are obtained for various special choices of the
initial conditions.


title: Chiral Perturbation Theory and the f2(1270) resonance

abstract:
  Within Chiral Perturbation Theory, we study elastic pion scattering in the
I=0, J=2, channel, whose main features are the f2(1270) resonance and the
vanishing of the lowest order. By means of a chiral model that includes an
explicit resonance coupled to pions, we describe the data and calculate the
resonance contribution to the O(p^4) and O(p^6) chiral parameters. We also
generalize the Inverse Amplitude Method to higher orders, which allows us to
study channels with vanishing lowest order. In particular, we apply it to the
I=0,J=2 case, finding a good description of the f2(1270) resonance, as a pole
in the second Riemann sheet.


title: Clock-Comparison Tests of Lorentz and CPT Symmetry in Space

abstract:
  Clock-comparison experiments conducted in space can provide access to many
unmeasured coefficients for Lorentz and CPT violation. The orbital
configuration of a satellite platform and the relatively large velocities
attainable in a deep-space mission would permit a broad range of tests with
Planck-scale sensitivity.


title: Transport theory and low energy properties of colour superconductors

abstract:
  The one-loop polarisation tensor and the propagation of ``in-medium'' photons
of colour superconductors in the 2SC and CFL phase is discussed. For a study of
thermal corrections to the low energy effective theory in the 2SC phase, a
classical transport theory for fermionic quasiparticles is invoked.


title: Diffractive DIS: Where Are We?

abstract:
  A brief review of the modern QCD theory of diffractive DIS is given. The
recent progress has been remarkably rapid, all the principal predictions from
the color dipole approach to diffraction - the $(Q^2+m_V^2)$ scaling, the
pattern of SCHNC, shrinkage of the diffraction cone in hard diffractive DIS,
the strong impact of longitudinal gluons in inclusive $J/\Psi$ production at
Tevatron -, have been confirmed experimentally.


title:
Can MSSM with light sbottom and light gluino survive Z-peak constraints
  ?

abstract:
  In the framework of minimal supersymmetric model we examine the Z-peak
constraints on the scenario of one light sbottom (2--5.5 GeV) and light gluino
(12--16 GeV), which has been successfully used to explain the excess of bottom
quark production in hadron collision. Such a scenario is found to be severely
constrained by LEP Z-peak observables, especially by R_b, due to the large
effect of gluino-sbottom loops. To account for the R_b data in this scenario,
the other mass eigenstate of sbottom, i.e., the heavier one, must be lighter
than 125 (195) GeV at 2-sigma (3-sigma) level, which should have been produced
in association with the lighter one at LEP II and will probobaly be within the
reach of Tevatron Run 2.


title: Proving Higgs Bosons are scalars at a Linear Collider

abstract:
  The threshold dependence and angular correlations of Higgs-strahlung in e+e-
collisions can be used to demonstrate the spinless nature of the Standard Model
Higgs boson. This method, and its possible extention to heavy neutral MSSM
Higgs bosons, is discussed.


title:
Compton scattering, vector meson photoproduction and the partonic
  structure of the nucleon

abstract:
  At moderate and large momentum transfer, high energy vector meson
photoproduction and Compton scattering can be consistently explained by
mechanisms based on interactions and exchanges of constituent quarks and
gluons. This opens an original window on the partonic structure of hadronic
matter by emphasizing the role of quark correlations, quark exchange as
implemented through saturating Regge trajectories and non-perturbative effects
in the gluon propagator, which provides us with a bridge with lattice
calculations. Compton scattering is directly related to vector meson
photoproduction and enlarges the data set.


title:
Signals for Non-Commutative QED in $e \gamma$ and $\gamma \gamma$
  Collisions

abstract:
  We study the effects of non-commutative QED (NCQED) in fermion pair
production, $\gamma + \gamma \to f + \bar{f}$ and Compton scattering, $e +
\gamma \to e + \gamma$. Non-commutative geometries appear naturally in the
context of string/M-theory and gives rise to 3- and 4-point photon vertices and
to momentum dependent phase factors in QED vertices which will have observable
effects in high energy collisions. We consider $e^+ e^-$ colliders with
energies appropriate to the TeV Linear Collider proposals and the multi-TeV
CLIC project operating in $\gamma \gamma$ and $e\gamma$ modes. Non-commutative
scales roughly equal to the center of mass energy of the $e^+e^-$ collider can
be probed, with the exact value depending on the model parameters and
experimental factors. However, we found that the Compton process is sensitive
to $\Lambda_{NC}$ values roughly twice as large as those accessible to the pair
production process.


title: Small quark stars in the chromodielectric model

abstract:
  Equations of state for strange quark matter in beta equilibrium at high
densities are used to investigate the structure (mass and radius) of compact
objects. The chromodielectric model is used as a general framework for the
quark interactions, which are mediated by chiral mesons, $\sigma$ and $\vec
\pi$, and by a confining chiral singlet dynamical field, $\chi$. Using a
quartic potential for $\chi$, two equations of state for the same set of model
parameters are obtained, one with a minimum at around the nuclear matter
density $\rho_0$ and the other at $\rho \sim 5 \rho_0$. Using the latter
equation of state in the Tolman-Oppenheimer-Volkoff equations we found
solutions corresponding to compact objects with $R\sim 5 - 8$ km and $M\sim
M_\odot$. The phenomenology of recently discovered X-ray sources is compatible
with the type of quark stars that we have obtained.


title: ADD extra dimensional gravity and di-jet production at hadron colliders

abstract:
  We re-analyze dijet production at hadron colliders (the Tevatron at Fermilab
and the Large Hadron Collider, LHC, at CERN), to determine the potential limits
on Planck mass in ADD type extra dimensional gravity scenarios. We try a
variety of experimental observables in order to maximize the exclusion limits;
we find that the $p_{_T}$, $p_{_T}^2$ and $\tau$ distributions give the highest
search limits, and these observables provide comparable reaches.


title: Robust signatures of solar neutrino oscillation solutions

abstract:
  With the goal of identifying signatures that select specific neutrino
oscillation parameters, we test the robustness of global oscillation solutions
that fit all the available solar and reactor experimental data. We use three
global analysis strategies previously applied by different authors and also
determine the sensitivity of the oscillation solutions to the critical nuclear
fusion cross section, S_{17}(0), for the production of 8B. The favored
solutions are LMA, LOW, and VAC in order of g.o.f. The neutral current to
charged current ratio for SNO is predicted to be 3.5 +- 0.6 (1 sigma), which is
separated from the no-oscillation value of 1.0 by much more than the expected
experimental error. The predicted range of the day-night difference in charged
current rates is (8.2 +- 5.2)% and is strongly correlated with the day-night
effect for neutrino-electron scattering. A measurement by SNO of either a NC to
CC ratio > 3.3 or a day-night difference > 10%, would favor a small region of
the currently allowed LMA neutrino parameter space. The global oscillation
solutions predict a 7Be neutrino-electron scattering rate in BOREXINO and
KamLAND in the range 0.66 +- 0.04 of the BP00 standard solar model rate, a
prediction which can be used to test both the solar model and the neutrino
oscillation theory. Only the LOW solution predicts a large day-night effect(<
42%) in BOREXINO and KamLAND. For the KamLAND reactor experiment, the LMA
solution predicts 0.44 of the standard model rate; we evaluate 1 sigma and 3
sigma uncertainties and the first and second moments of the energy spectrum.


title:
Radiative return at NLO and the measurement of the hadronic
  cross-section

abstract:
  The measurement of the hadronic cross-section in $e^+ e^-$ annihilation at
high luminosity factories using the radiative return method is motivated and
discussed. A Monte Carlo generator which simulates the radiative process $e^+
e^- \to \gamma+hadrons$ at the next-to-leading order accuracy is presented. The
analysis is then extended to the description of events with hard photons
radiated at very small angle.


title:
Stochastic Production Of Kink-Antikink Pairs In The Presence Of An
  Oscillating Background

abstract:
  We numerically investigate the production of kink-antikink pairs in a $(1+1)$
dimensional $\phi^4$ field theory subject to white noise and periodic driving.
The twin effects of noise and periodic driving acting in conjunction lead to
considerable enhancement in the kink density compared to the thermal
equilibrium value, for low dissipation coefficients and for a specific range of
frequencies of the oscillating background. The dependence of the kink-density
on the temperature of the heat bath, the amplitude of the oscillating
background and value of the dissipation coefficient is also investigated. An
interesting feature of our result is that kink-antikink production occurs even
though the system always remains in the broken symmetry phase.


title:
Light-Front QCD Hamiltonian Dynamics and Constituent Quark Picture in
  Exclusive Processes

abstract:
  After reviewing a connection between quantum chromodynamics and contituent
quark model pictures in the light-front quantization with some comparison and
contrast to the ordinary equal-time bridge a la Bogoliubov-Valatin
transformation, we discuss some newer development of the light-front quark
model phenomenology in exclusive processes including the embedded state. The
skewed parton distribution appears to be a good testing ground for our new
effective treatment of the light-front nonvalence contributions in timelike
exclusive processes.


title: Slepton Flavor Physics at Linear Colliders

abstract:
  If low energy supersymmetry is realized in nature it is possible that a first
generation linear collider will only have access to some of the superpartners
with electroweak quantum numbers. Among these, sleptons can provide sensitive
probes for lepton flavor violation through potentially dramatic lepton
violating signals. Theoretical proposals to understand the absence of low
energy quark and lepton flavor changing neutral currents are surveyed and many
are found to predict observable slepton flavor violating signals at linear
colliders. The observation or absence of such sflavor violation will thus
provide important indirect clues to very high energy physics. Previous analyses
of slepton flavor oscillations are also extended to include the effects of
finite width and mass differences.


title: Anomaly-Mediated Supersymmetry Breaking with Axion

abstract:
  We construct hadronic axion models in the framework of the anomaly-mediated
supersymmetry breaking scenario. If the Peccei-Quinn symmetry breaking is
related to the supersymmetry breaking, mass spectrum of the minimal
anomaly-mediated scenario is modified, which may solve the negative slepton
mass problem in the minimal anomaly-mediated model. We find several classes of
phenomenologically viable models of axion within the framework of the anomaly
mediation and, in particular, we point out a new mechanism of stabilizing the
axion potential. In this class of models, the Peccei-Quinn scale is related to
the messenger scale. We also study phenomenological aspects of this class of
models. We will see that, in some case, the lightest particle among the
superpartners of the standard-model particles is stau while the lightest
superparticle becomes the axino, the superpartner of the axion. With such a
unique mass spectrum, conventional studies of the collider physics and
cosmology for supersymmetric models should be altered.


title: Noncommutativity of Lepton Mass Matrices: Flavor Mixing and CP Violation

abstract:
  I follow a lesson learnt from Heisenberg's matrix Quantum Mechanics to study
the property of lepton flavor mixing and CP violation. I show that the
commutator of lepton mass matrices defined in vacuum keeps invariant under
terrestrial matter effects within the four-neutrino mixing scheme. A set of
model-independent sum rules for neutrino masses are obtained, and they can be
generalized to hold for an arbitrary number of neutrino families. Useful sum
rules for the rephasing-invariant measures of leptonic CP violation have also
been found. Finally I present a generic formula of T-violating asymmetries
applicable to the future long-baseline neutrino oscillation experiments.


title: Out-of-plane QCD radiation in DIS with high p_t jets

abstract:
  We present a QCD analysis of the cumulative out-of-event-plane momentum
distribution in DIS process with emission of high p_t jets. We derive the
all-order resummed result to next-to-leading accuracy and estimate the leading
power correction. We aim at the same level of accuracy which, in e+e-
annihilation, seems to be sufficient for making predictions. As is typical of
multi-jet observables, the distribution depends on the geometry of the event
and the underlying colour structure. This result should provide a powerful
method to study QCD dynamics, in particular to constrain the parton
distribution functions, to measure the running coupling and to search for
genuine non-perturbative effects.


title: QCD Finite Energy Sum Rules and the Isoscalar Scalar Mesons

abstract:
  We apply QCD Finite Energy Sum Rules to the scalar-isoscalar current to
determine the lightest $u \bar{u} + d \bar{d}$ meson in this channel. We use
`pinch-weights' to improve the reliability of the QCD predictions and reduce
the sensitivity to the cut-off $s_0$. A decaying exponential is included in the
weight function to allow us to focus on the contribution from low mass states
to the phenomenological integral. On the theoretical side we include OPE
contributions up to dimension six and a contribution due to instantons taken
from the Instanton Liquid Model. Phenomenologically, we incorporate
experimental data by using a coupling scheme for the scalar current which links
the vacuum polarisation to the $\pi \pi$ scattering amplitude via the scalar
form factor. We find that the sum rules are well saturated for certain
instanton parameters. We conclude that the $f_0(400-1200)$ definitely contains
a large $u \bar{u} + d \bar{d}$ component, whereas the $f_0(980)$ most likely
does not. We are able to estimate the average light quark mass and find $m_q(1
\GeV) = 5.2 \pm 0.6$ MeV.


title: Strangeness Enhancement and Canonical Suppression

abstract:
  We demonstrate the essential role of canonical suppression in strangeness
enhancement. The pattern of enhancement of strange and multistrange baryons
observed by the WA97 collaboration can be understood on this basis. Besides, it
is shown that in canonical approach strangeness enhancement is a decreasing
function of collision energy. It is the largest at $\sqrt{s}=8.7$ GeV where the
enhancement of $\Omega,\Xi$ and $\Lambda$ is of the order of 100, 20 and 3
respectively.


title:
Analytical Result for Dimensionally Regularized Massive On-Shell Planar
  Double Box

abstract:
  The dimensionally regularized master planar double box Feynman diagram with
four massive and three massless lines, powers of propagators equal to one, all
four legs on the mass shell, i.e. with p_i^2=m^2, i=1,2,3,4, is analytically
evaluated for general values of m^2 and the Mandelstam variables s and t. An
explicit result is expressed in terms of polylogarithms, up to the third order,
depending on special combinations of m^2,s and t.


title: On Topological Defects

abstract:
  The language and methods of algebraic topology, particularly homotopy theory,
have been extensively used in the study of the identification, the
classification and the evolution of defects. Topological methods provide the
means for the detection of gross features, such as holes in a manifold, and
therefore one would clearly anticipate that the defects, if identifiable by
such means, to be linked with that kind of configurations. In physical media,
however, defects usually manifest themselves in ways which have no distinct and
direct association with patterns of topological value along the lines of our
previous reference. In this paper we will postulate that the defects do not
themselves correspond to topological features. Instead, they are forced to
exist in order to redress the violation of physical rules happening as a result
of the topological nature of our system. We will, thus, assume that the
topology of our system changes with the introduction of defects. Therefore, the
relevent to our study topological methods will be applied to a well defined
physical system only in the absence of defects.


title: Quark-antiquark potentials from a scalar field in SU(2) YM

abstract:
  A generalized Dick model with a potential term is discussed. The solution
originating from a static, pointlike, color source is found to have a confining
part. The comparison with a wide spectrum of phenomenological quark-antiquark
potentials is presented.


title: Are Centauros exotic signals of the QGP?

abstract:
  The exotic cosmic ray events are reviewed. Theoretical attempts to explain
the Centauro-like phenomena are summarized. Results of accelerator experiments
looking for Centauro-related objects are discussed. The discussion is completed
with an overview of the current and future collider experiments at RHIC and
LHC. In particular the CASTOR detector, dedicated to Centauro and strange
objects research in heavy ion collisions at the LHC energies is presented.


title:
Direct Higgs production and jet veto at the Tevatron and the LHC in NNLO
  QCD

abstract:
  We consider Higgs boson production through gluon--gluon fusion in hadron
collisions, when a veto is applied on the transverse momenta of the
accompanying hard jets. We compute the QCD radiative corrections to this
process at NLO and NNLO. The NLO calculation is complete. The NNLO calculation
uses the recently evaluated NNLO soft and virtual QCD contributions to the
inclusive cross section. We find that the jet veto reduces the impact of the
NLO and NNLO contributions, the reduction being more sizeable at the LHC than
at the Tevatron.