title: Simplifying Algebra in Feynman Graphs, Part I:Spinors

abstract:
  We present a general formalism for simplifying manipulations of spin indices
of massless and massive spinors and vectors in Feynman diagrams. The formalism
is based on covariantly reducing the number of field components in the action
in favor of chiral/self-dual fields. In this paper we concentrate on
calculational simplifications involving fermions in gauge theories by
eliminating half of the components of Dirac spinors. Some results are: (1) We
find reference momenta for massless fermions analogous to those used for
external gauge bosons. (2) Many of the known supersymmetry identities (tree and
one-loop) are seen in a simple manner from the graphs. (3) Manipulations with
external line factrs for massive fermions are unnecessary. (4) Some of the
simplifications for nearly maximally helicity violating gluonic amplitudes are
built into the Feynman rules.


title: Enhanced Charmless Yield in B Decays and Inclusive B-Decay Puzzles

abstract:
  Our analysis suggests that the charmless yield in B decays is enhanced over
traditional estimates. The c c.bar pair produced in b to c c.bar transitions
may be seen significantly as light hadrons due to non-perturbative effects.
Existing data samples at Upsilon(4S) and Z^0 factories allow key measurements
which are outlined.


title:
FSI Rescattering in $B^\pm$ Decays via States with $\eta, \eta', \omega$
  and $\phi$

abstract:
  New results going beyond those obtained from isospin and flavor symmetry and
subject to clear experimental tests are obtained for effects of FSI in $B^\pm$
decays to charmless strange final states containing neutral flavor-mixed mesons
like $\omega$, $\phi$, $\eta$ and $\eta'$. The most general strong-interaction
diagrams containing arbitrary numbers of quarks and gluons are included with
the assumptions that any $q \bar q$ pair created by gluons must be a flavor
singlet, and that there are no hairpin diagrams in which a final meson contains
a $q \bar q$ pair from the same gluon vertex. The smallness of $K^- \eta$
suggests that it might have a large CP violation. A sum rule is derived to test
whether the large $K^- \eta'$ requires the addition of an additional glueball
or charm admixture. Further analysis from $D_s$ decay systematics supports this
picture of FSI and raises questions about charm admixture in the $\eta'$.


title: Supergravity Unified Models

abstract:
  The development of supergravity unified models and their implications for
current and future experiments are discussed.


title:
Decoupling Relations to O(alpha_s^3) and their Connection to Low-Energy
  Theorems

abstract:
  If quantum chromodynamics (QCD) is renormalized by minimal subtraction (MS),
at higher orders, the strong coupling constant alpha_s and the quark masses m_q
exhibit discontinuities at the flavour thresholds, which are controlled by
so-called decoupling constants, zeta_g and zeta_m, respectively. Adopting the
modified MS (MS-bar) scheme, we derive simple formulae which reduce the
calculation of zeta_g and zeta_m to the solution of vacuum integrals. This
allows us to evaluate zeta_g and zeta_m through three loops. We also establish
low-energy theorems, valid to all orders, which relate the effective couplings
of the Higgs boson to gluons and light quarks, due to the virtual presence of a
heavy quark h, to the logarithmic derivatives w.r.t. m_h of zeta_g and zeta_m,
respectively. Fully exploiting present knowledge of the anomalous dimensions of
alpha_s and m_q, we thus calculate these effective couplings through four
loops. Finally, we perform a similar analysis for the coupling of the Higgs
boson to photons.


title: Instantons and the Chiral Phase Transition at non-zero Baryon Density

abstract:
  We study an interacting ensemble of instantons at finite baryon chemical
potential. We emphasize the importance of fermionic zero modes and calculate
the fermion induced interaction between instantons at non-zero chemical
potential. We show that unquenched simulations of the instanton ensemble are
feasible in two regimes, for sufficiently small and for very large chemical
potential. At very large chemical potential chiral symmetry is restored and the
instanton ensemble is dominated by strongly correlated chain-like
configurations.


title: Pade Improvement of the Free Energy in High Temperature QCD

abstract:
  Pade approximants (PA's) are constructed from the perturbative coefficients
of the free energy through O(g^5) in hot QCD. Pade summation is shown to reduce
the renormalization-scale dependence substantially even at temperature (T) as
low as 250 MeV.
  Also, PA's predict that the free energy does not deviate more than 10 % from
the Stefan-Boltzmann limit for T > 250 MeV.


title: Production and Suppression of Charmonium in Nuclear Collisions

abstract:
  $J/\psi$ production cross section considering the contributions of both
color-singlet and color-octet $c\bar c$ channels is calculated. The result is
used to study the suppression of $J/\psi$ in nuclear collisions. With
absorption cross sections for $(c \bar c)_8$ $\sigma_{abs}^8\simeq 11mb $ and
$(c \bar c)_1$ $\sigma_{abs}^1\simeq 0mb $ the p-A and A-B data except for
Pb-Pb can be explained. Possible explanations of additional suppression in
Pb-Pb are discussed.


title: Anomalous W boson production at HERA

abstract:
  We present the results of complete tree level calculation for W boson
production processes e^- p -> e^- mu^+ nu_mu X and e^- p -> e^- mu^- nu_mubar X
introducing anomalous WWgamma and WWZ couplings. Detailed results for the
distributions of final state particles are obtained. In the region of small
momentum transferred we calculate the contribution of hadronlike photon
component in the structure function approach.


title: Running Flavor Number and Asymptotic Freedom in the Normal Phase of QED

abstract:
  In the normal phase (where no dynamical fermion mass generation occurs) of
the D-dimensional quantum electrodynamics with $N_f$ flavors of fermions, we
derive an integral equation which should be satisfied by (the inverse of) the
wave function renormalization of the fermion in the Landau gauge. For this we
use the inverse Landau-Khalatnikov transformation connecting the nonlocal gauge
with the Landau gauge. This leads to a similar equation for the running flavor
number in the framework of the $1/N_f$ resumed Schwinger-Dyson equation.
Solving the equation analytically and numerically, we study the infrared
behavior and the critical exponent of the 3-dimensional QED (QED$_3$). This
confirms that the flavor number in QED$_3$ runs according to the $\beta$
function which is consistent with the asymptotic freedom as that in
4-dimensional QCD.


title:
Model-independent QED corrections to photon structure-function
  measurements

abstract:
  We present the first calculation of QED radiative corrections to
deep-inelastic electron-photon scattering in terms of those variables that are
reconstructed in measurements of the photon structure function in
electron-positron collisions. In order to cover the low-$Q^2$ region, we do not
invoke the QCD-improved parton model but rather express our results in terms of
the photon structure functions. Both analytical and numerical results are
given.


title: Towards an unified picture of constituent and current quarks

abstract:
  Using a simple picture of the constituent quark as a composite system of
point-like partons, we construct the parton distributions by a convolution
between constituent quark momentum distributions and constituent quark
structure functions. We evaluate the latter at a low hadronic scale with
updated phenomenological information, and we build the momentum distributions
using well-known quark models. The resulting parton distributions and structure
functions are evolved to the experimental scale and good agreement with the
available DIS data is achieved. When compared with a similar calculation using
non-composite constituent quarks, the accord with experiment of the present
calculation becomes impressive. We therefore conclude that DIS data are
consistent with a low energy scenario dominated by composite, mainly
non-relativistic constituents of the nucleon.


title:
Derivation of transport equations for a strongly interacting Lagrangian
  in powers of $\hbar$ and $1/N_c$

abstract:
  Transport theory for an interacting fermionic system is reviewed and applied
to the chiral Lagrangian of the Nambu-Jona-Lasinio model. Two expansions must
be applied: an expansion in the inverse number of colors, $1/N_c$, due to the
nature of the strong coupling theory, and a semiclassical expansion, in powers
of $\hbar$. The quasiparticle approximation is implemented at an early stage,
and spin effects are omitted. The self-energy is evaluated, self-consistently
only in the Hartree approximation, and semi-perturbatively in the collision
integral. In the Hartree approximation, $O((1/N_c)^0)$, the Vlasov equation is
recovered to $O(\hbar^1)$, together with an on-mass shell constraint equation,
that is automatically fulfilled by the quasiparticle ansatz. The expressions
for the self-energy to order $O((1/N_c))$ lead to the collision term. Here one
sees explicitly that particle-antiparticle creation and annihilation processes
are suppressed that would otherwise be present, should an off-shell energy
spectral function be admitted. A clear identification of the $s$, $t$ and $u$
channel scattering processes in connection with the self-energy graphs is made
and the origin of the mixed terms is made evident. Finally, after ordering
according to powers in $\hbar$, a Boltzmann-like form for the collision
integral is obtained.


title: Messenger sneutrinos as cold dark matter

abstract:
  In models where supersymmetry breaking is communicated into the visible
sector via gauge interactions the lightest supersymmetric particle is typically
the gravitino which is too light to account for cold dark matter. We point out
that the lightest messenger sneutrinos with mass in the range of one to three
TeV may serve as cold dark matter over most of the parameter space due to
one-loop electroweak radiative corrections. However, in the minimal model this
mass range has been excluded by the direct dark matter searches. We propose a
solution to this problem by introducing terms that explicitly violate the
messenger number. This results in low detection rate for both direct and
indirect searches and allows messenger sneutrinos to be a valid dark matter
candidate in a wide region of SUSY parameter space.


title: Gluonic Hadrons and Charmless B Decays

abstract:
  Hybrid charmonium with mass ~4 GeV could be produced via a c c.bar
color-octet component in b->c c.bar s. These states could be narrow and could
have a significant branching ratio to light hadrons, perhaps enhanced by
glueballs. Decays to gluonic hadrons could make a sizable contribution to B->no
charm decays. Experimental signatures and search strategies are discussed.


title: Nucleon Structure Functions within a Chiral Soliton Model

abstract:
  We study nucleon structure functions within the bosonized
Nambu--Jona--Lasinio model where the nucleon emerges as a chiral soliton. We
discuss the model predictions on the Gottfried sum rule for electron--nucleon
scattering. A comparison with a low--scale parametrization shows that the model
reproduces the gross features of the empirical structure functions. We also
compute the leading twist contributions of the polarized structure functions
$g_{1}(x)$ and $g_{2}(x)$ in this model. We compare the model predictions on
these structure functions with data from the E143 experiment by GLAP evolving
them appropriately.


title: Structure Functions from Chiral Soliton Models

abstract:
  We study nucleon structure functions within the bosonized Nambu-Jona-Lasinio
(NJL) model where the nucleon emerges as a chiral soliton. We discuss the model
predictions on the Gottfried sum rule for electron-nucleon scattering. A
comparison with a low-scale parametrization shows that the model reproduces the
gross features of the empirical structure functions. We also compute the
leading twist contributions of the polarized structure functions $g_{1}(x)$ and
$g_{2}(x)$ in this model. We compare the model predictions on these structure
functions with data from the E143 experiment by GLAP evolving them from the
scale characteristic for the NJL-model to the scale of the data.


title: Two-Body Dirac Equation and Its Wave Function at the Origin

abstract:
  A relativistic equation is deduced for the bound state of two particles, by
assuming a proper boundary condition for the propagation of the negative-energy
states. It reduces to the (one-body)Dirac equation in the infinite limit of one
of the constituent mass. It also has the symmetries to assure the existence of
the anti-bound-state with the same mass. The interaction
kernel(pseudo-potential) is systematically constructed by diagonalizing the
Hamiltonian of the background field theory, by which the retardation effects
are included in the interaction. Its wave function at the origin(WFO) behaves
properly in a manner suggested by the covariant field theory.
  The equation can well be applied in the heavy quark effective theory. It can
also be used as a starting equation for the unperturbed system in the rigorous
perturbation theory of QED.


title: A non-chiral extension of the standard model with mirror fermions

abstract:
  The difficulties of defining chiral gauge theories non-perturbatively suggest
a vector-like extension of the standard model with three mirror fermion
families. Some phenomenological implications of such an extension are
discussed.


title:
A lattice determination of the second moment of the polarised valence
  quark distribution

abstract:
  We perform a Monte Carlo calculation of the second moment of the polarised
valence quark distributions in the nucleon, using quenched Wilson fermions. The
special feature of this moment is that it is directly accessible
experimentally. At a scale of $\mu \approx 2$GeV we find $\Delta^{(1)}u =
0.198(8)$, $\Delta^{(1)}d = -0.0477(33)$. We compare these numbers with recent
experimental results of the SMC collaboration.


title: Heavy quark pair correlations in QCD

abstract:
  The azimutal correlations of heavy quarks produced in the high energy $pp$
($p\bar{p}$) collisions are calculated in the framework of QCD without the
usual assumptions of the parton model. The virtual nature of the interacting
gluons as well as their transverse motion and different polarizations are taken
into account. We give some predictions for the azimutal correlations of charm
and beauty hadrons produced at Tevatron-collider and LHC.


title:
R-Parity Violating SUSY Signals in Lepton-Pair Production at the
  Tevatron

abstract:
  In supersymmetric theories with R-parity breaking, sleptons can be produced
in quark-antiquark annihilation at the Tevatron through interactions in which
two quark fields are coupled to a slepton field. If at the same time trilinear
slepton-lepton-lepton couplings are present, the sleptons can be searched for
as resonances in $p\bar{p}\to \tilde{\nu} \to l^+l^-$ and $\tilde{\tau}\to l\nu
$ final states. Existing Tevatron data can be exploited to derive bounds on the
Yukawa couplings of sleptons to quark and lepton pairs. Similar bounds can also
be obtained from $e^+e^-$ annihilation to hadrons at LEP2.


title:
Are charm and high-$p_{\perp}$ jets the keys to understanding
  diffraction in DIS ?

abstract:
  Following an introduction which explains some basic ideas about diffraction,
the semiclassical approach to diffraction in deep inelastic scattering (DIS) is
outlined. Some phenomenological tests of this picture, concerning the
$p_{\perp}$ and mass spectra of open charm and jet production are given.


title:
Probing the Structure of Virtual Photon in the Deep Inelastic Compton
  Process at HERA

abstract:
  The sensitivity of the Deep Inelastic Compton (DIC) scattering at HERA to the
structure of the virtual photon is discussed. It is demonstrated that the
gluonic content of the virtual photon can be pinned down by measuring the
photons with $p_T \sim 5 $ GeV in the proton direction.


title: A unitarity bound and the components of photon - proton interactions

abstract:
  We show how and why the small distance ("hard") interaction, calculable in
perturbative QCD, provides a mass cutoff in Gribov's formula for photon-proton
collisions. This enables us to find a new and more restrictive bound for this
process, $\sigma(\gamma^{*}p)\leq C(ln 1/x)^{5/2}$.A simple model the published
experimental data over a wide range of photon virtualities ($Q^2$) and energies
($W$), is developed. This model provides a quantitative way of evaluating the
relative rate of the small and large distance contributions, in the different
kinematic regions. The main results of the analysis are (i) that even at $Q^2
=0$ and high energies the short distance contribution is not small, and it
provides a possible explanation for the experimental rise of the
photoproduction cross section; and (ii) at large values of $Q^2$, the long
distance processes still contribute to the total cross section.


title:
The Screening Mass Squared in Hot Scalar Theory to Order $g^5$ Using
  Effective Field Theory

abstract:
  We study massless $g^2\Phi^4$-theory at high temperature and with zero
chemical potential. Using modern effective field theory methods,% recently
developed by Braaten and Nieto, we derive the screening mass squared to order
$g^5$. It is demonstrated that the result is renormalization group invariant to
this order in the coupling constant. Renormalization group methods are used to
sum up leading logarithms of $g$.


title:
Semileptonic and nonleptonic two-body charmed meson decays in an
  effective model

abstract:
  We analyze charm meson semileptonic $D \to V l \nu_l$ and $D\to P l \nu_l$
and nonleptonic $D \to P V$, $D \to PP$ and $D \to VV$ decays within a model
which combines the heavy quark effective Lagrangian and chiral perturbation
theory.


title: Quark-antiquark correlation in the pion

abstract:
  The electromagnetic tensor for inclusive electron scattering off the pion,
($W^{\mu\nu}$), for momentum transfers such that $q^+=0$, ($q^+=q^0+q^3$) is
shown to obey a sum-rule for the component $W^{++}$. From this sum-rule, one
can define the quark-antiquark correlation function in the pion, which
characterizes the transverse distance distribution between the quark and
antiquark in the light-front pion wave-function. Within the realistic models of
the relativistic pion wave function (including instanton vacuum inspired wave
function) it is shown that the value of the two-quark correlation radius
($r_{q\bar q}$) is near twice the pion electromagnetic radius ($r_{\pi}$),
where $r_{\pi} \approx 2/3$ fm. We also define the correlation length
$l_{corr}$ where the two - particle correlation have an extremum. The
estimation of $l_{corr}\approx 0.3 - 0.5$ fm is very close to estimations from
instanton models of QCD vacuum. It is also shown that the above correlation is
very sensitive to the pion light-front wave-function models.


title:
Effects of neutrino oscillations and neutrino magnetic moments on
  elastic neutrino-electron scattering

abstract:
  We consider elastic antineutrino-electron scattering taking into account
possible effects of neutrino masses and mixing and of neutrino magnetic moments
and electric dipole moments. Having in mind antineutrinos produced in a nuclear
reactor we compute, in particular, the weak-electromagnetic interference terms
which are linear in the magnetic (electric dipole) moments and also in the
neutrino masses. We show that these terms are, however, suppressed compared to
the pure weak and electromagnetic cross section. We also comment upon the
possibility of using the electromagnetic cross section to investigate neutrino
oscillations.


title: Phase transition of a finite quark-gluon plasma

abstract:
  The deconfinement transition region between hadronic matter and quark-gluon
plasma is studied for finite volumes. Assuming simple model equations of state
and a first order phase transition, we find that fluctuations in finite volumes
hinder a sharp separation between the two phases around the critical
temperature, leading to a rounding of the phase transition. For reaction
volumes expected in heavy ion experiments, the softening of the equation of
state is reduced considerably. This is especially true when the requirement of
exact color-singletness is included in the QGP equation of state.


title: Constraints on Variant Axion Models

abstract:
  A particular class of variant axion models with two higgs doublets and a
singlet is studied. In these models the axion couples either to the $u$-quark
or $t$-quark or both, but not to $b$, $c$, $s$, or $d$. When the axion couples
to only one quark the models possess the desirable feature of having no domain
wall problem, which makes them viable candidates for a cosmological axion
string scenario. We calculate the axion couplings to leptons, photons and
nucleons, and the astrophysical constraints on the axion decay constant $v_a$
are investigated and compared to the DFSZ axion model. We find that the most
restrictive lower bound on $v_a$, that from SN1987a, is lowered by up to a
factor of about 30, depending on the model and also the ratio of the vacuum
expectation values of the higgs doublets. For scenarios with axionic strings,
the allowed window for $v_a$ in the $u$ quark model can be more than two orders
of magnitude. For inflationary scenarios, the cosmological upper bound on
$v_a/N$, where $N$ is the QCD anomaly factor, is unaffected: however, the
variant models have $N$ either 3 or 6 times smaller than the DFSZ model.


title: On Heavy Quarks Photoproduction and c -> D* Fragmentation Functions

abstract:
  The state of the art of the theoretical calculations for heavy quarks
photoproduction is reviewed. The full fixed order next-to-leading order massive
calculation and the resummation of large log(p_T/m) terms for differential
cross sections are described. The implementation of a non-perturbative
fragmentation function describing the c -> D* meson transition is also
discussed.


title: Are Two Gluons the QCD Pomeron?

abstract:
  Collider experiments have recently measured the production cross section of
hard jets separated by a rapidity gap as a function of transverse momentum and
gap size. We show that these measurements reveal the relative frequencies for
the production of rapidity gaps in quark-quark, quark-gluon and gluon-gluon
interactions. The results are at variance with the idea that the exchange of 2
gluons is a first order approximation for the mechanism producing colorless
states, i.e. the hard QCD Pomeron. They do qualitatively support the "soft
color" or "color evaporation" scheme developed in the context of bound-state
heavy quark production.


title: Dark matter in gravity-mediated supersymmetry breaking

abstract:
  In R parity conserving supersymmetric theories the lightest superpartner
(LSP) is stable. The LSPs may comprise a large fraction of the energy density
of the current universe, which would lead to dramatic astrophysical
consequences. In this talk, I discuss some of the main lessons we have learned
about supersymmetric models from relic abundance considerations of the LSP.


title: Mass density of neutralino dark matter

abstract:
  The lightest supersymmetric particle (LSP) is stable in an R-parity
conserving theory. In this article the steps needed to calculate the present
day mass density of such a particle are detailed. It is shown that there can be
a cosmologically significant amount of LSP dark matter in the universe.
Furthermore, relic abundance considerations put an upper bound on how large
supersymmetry breaking masses can be without resorting to finetuning arguments.


title: Decay of Z into Three Pseudoscalar Bosons

abstract:
  We consider the decay of the $Z$ boson into three pseudoscalar bosons in a
general two-Higgs-doublet model. Assuming $m_A$ to be very small, and that of
the two physical neutral scalar bosons $h_1$ and $h_2$, $A$ only couples to $Z$
through $h_1$, we find the $Z \to A A A$ branching fraction to be negligible
for moderate values of $\tan \beta \equiv v_2/v_1$, if there is no $\lambda_5
(\Phi_1^\dagger \Phi_2)^2 + h.c.$ term in the Higgs potential; otherwise there
is no absolute bound but very large quartic couplings (beyond the validity of
perturbation theory) are needed for it to be observable.


title:
A strong electroweak sector at future linear colliders: comparison of
  models

abstract:
  In this work we have studied the phenomenological properties at future e+e-
linear colliders of two models of strong electroweak symmetry breaking,
characterized by the presence of new spin one strong interacting resonances.


title: Extracting SUSY Parameters from Selectron and Chargino Production

abstract:
  We review the extraction of fundamental supersymmetric parameters from
experimental observables related to the detection of charginos and selectrons
at $e^+e^-$ colliders. We consider supergravity models with universal scalar
and gaugino masses and radiatively broken electroweak symmetry. Two scenarios
are considered: (a) The lightest chargino is light enough to be produced at
LEP2, and (b) the right handed selectron is light enough to be produced at
LEP2. We show how the validity of supergravity models can be tested even if
experimental errors are large. Interesting differences between the spectrum in
the two scenarios are pointed out.


title: Photon splitting cascades and a new statistics

abstract:
  Photon splitting cascades in a magnetic field are considered. It is shown, in
the stochastic limit approximation, that photons in cascades might form
entangled states (``triphons'') and that they obey not Bose but a new type of
statistics, the so called infinite or quantum Boltzmann statistics. These
states belong to an interacting Fock space which is a generalization of the
ordinary Fock space. The new photon statistics in principle can be detected in
future astrophysical experiments such as the planned Integral mission and also
in nonlinear quantum optics.


title:
Absorptive corrections to the one pion exchange and measurablity of the
  small-x pion structure function at HERA

abstract:
  We compaWe compare the absorptive corrections to the one pion exchange in
$pp\to Xn$ and $ep\to e'Xn$ reactions. It is shown that the absorption is
stronger in the case of $pp$ collision. The difference in strength of the
absorption for the $pp\to Xn$ and $ep\to e'Xn$ reactions breaks the
factorization peculiar to the pure one pion exchange. We evaluate the emerging
model dependence of extraction of the small-$x$ pion structure function from an
analysis of the HERA data on the neutron production at physical values of $t$.


title: Strong Decays Of Heavy Hadrons In HQET

abstract:
  We discuss the application of the tensor formalism of HQET to the strong
decays of heavy hadrons. We treat both meson and baryon decays, and note that
all of our results are in agreement with the `spin-counting' arguments of Isgur
and Wise. We briefly discuss the possible extension of the formalism to include
$1/m$ corrections.


title:
The order $O(\bar{\alpha}~\bar{\alpha}_s)$ and $O(\bar{\alpha}^2)$
  corrections to the decay width of the neutral Higgs boson to the $\bar{b}b$
  pair

abstract:
  We present the analytical expressions for the contributions of the order
$O(\bar{\alpha}~\bar{\alpha}_s)$ and $O(\bar{\alpha}^2)$ corrections to the
decay width of the Standard Model Higgs boson into the $\bar{b}b$-pair. The
numerical value of the mixed QED and QCD correction of order
$O(\bar{\alpha}~\bar{\alpha}_s)$ is comparable with the previously calculated
terms in the perturbative series for $\Gamma(H^0\to\bar{b}b)$.


title: About an influence of external electromagneticfields on the axion decays

abstract:
  Some results of an external electromagnetic field influence on axion decays
are presented. It is shown that the field catalyzes substantially these
processes. The result describing the axion decay $a \to f \tilde f$ we have
obtained can be of use to re-examine the lower limit on the axion mass in case
of possible existence of strong magnetic fields at the early Universe stage.


title: J/\psi Suppression in Pb+Pb Collisions: A New Look at Hadrons vs. Plasma

abstract:
  A reexamination of hadronic comover scattering indicates that this mechanism
cannot explain the observed $\psi$ suppression in Pb+Pb interactions. The
possibility of quark-gluon plasma formation is therefore considered.


title: Factorial moment analyses in diffractive lepton-nucleon scattering

abstract:
  It is pointed out that "the colorless objects" in diffractive lepton-nucleon
scattering in the small-$x_B$ region can be probed by measuring the scaled
factorial moments of final-state-hadrons and the dependence of their scaling
behavior upon the diffractive kinematic variables. The Monte Carlo
implementation of RAPGAP and JETSET are discussed as illustrative examples. The
results of these model-calculations show in particular that inclusion of the
contributions from the gamma gluon fusion processes can considerably enlarge
the power of the scaled factorial moments. The possibility for probing the
anomalous scaling behaviors of probability moments of the transverse energies
in HERA calorimeter environment is also discussed.


title: On the odderon intercept in QCD

abstract:
  The odderon singularity is studied in perturbative QCD in the framework of
the Bartels-Kwieci\'nski-Praszalowicz (BKP) equation. Arguments for the odderon
intercept being exactly equal to unity are given. Besides, a variational method
based on a complete system of one-gluon functions is presented. For the
odderon, the highest intercept calculated by this method is
$1-(N_c\alpha_{s}/\pi) 0.45$. Comparison to other calculations is shown.


title: Non-Abelian Equilibration in Heavy Ion Collisions

abstract:
  The uncertainty in the equilibration in heavy ion collisions due to the
choice of the value of the coupling is examined. The results of the
equilibration are indeed affected by this choice. In particular, a variation of
$\a_s$ from 0.3 to 0.5 reduces the parton phase of the plasma by as much as 4.0
fm/c and increasing coupling causes a reduction in the generated entropy. As
far as equilibration is concerned, larger coupling results in faster
equilibration both chemically and kinetically but improvements only happen to
the fermions. These are accompanied by more rapid cooling and therefore
shortened lifetime. In the light of these results, to choose $\a_s$ is almost
equivalent to choosing the results. Also because of consistency, any fixed
$\a_s$ is incompatible with an evolving plasma. The best choice is therefore
not to choose at all but let the system makes its own decision. We show a
simple recipe how this can be done. With an evolving coupling, equilibration is
accelerated with better results at the expense of the duration of the
deconfined phase.


title:
Neutrino Oscillation and Magnetic Moment from $\nu - e^{-}$ Elastic
  Scattering

abstract:
  We discuss how the measurement of the $\bar{\nu}_{e}-e^{-}$ elastic cross
section at reactor energies can be used to extract new information on the
neutrino oscillation parameters. We also consider the magnetic moment
contribution and show how both effects tend to cancel each other when the total
cross section is measured; to achieve the separation of each of the effects,
experiments capable of measuring angular and energy distributions with respect
to the outgoing electron become necessary. We study how their different energy
and angle dependence enables such a separation; then, the sensitivity to
magnetic moments, masses and mixings is discussed. We also show how these
experiments can be sensitive to the magnetic moment of $\tau$ neutrinos via
$\bar{\nu}_{e}\leftrightarrow \bar{\nu}_{\mu}$ oscillation.


title: B->Xq l+ l- (q=d,s) and Determination of |Vtd/Vts|

abstract:
  We propose a new method to extract |Vtd/Vts| from the ratio of the decay
distributions dR/ds = dB(B->Xdl+l-)/ds/dB(B->Xsl+l-)/ds. This ratio depends
only on the KM ratio |Vtd/Vts| with 15% theoretical uncertainties, if dilepton
invariant mass-squared s is away from the peaks of the possible resonance
states, J/psi, psiprime, and etc. We also give a detailed analytical and
numerical analysis on dB(B-Xql+l-)/ds (q=d,s) and dR/ds.


title: Pure QCD bounds and estimates for light quark masses

abstract:
  We consider bounds on light quark masses that follow from positivity of the
pseudoscalar correlator spectral function plus the assumption that perturbative
QCD is valid for the correlator and its derivatives up to order $N$ for momenta
$t\geq\hat{t}$. We find that the bounds vary a lot depending on the assumed
value of $\hat{t}$ and even, if it is too small ($\hat{t}\simeq 1.5, 1.6, 2.1
Gev^2$ for respectively $N=0, 1, 2$), that there is incompatibility between the
asumption of validity of perturbative QCD and positivity. This allows us to
establish a criterion for the values of $\hat{t}$ admissible, and to get upper
and lower bounds for $m_s$ and upper bounds for $m_d+m_u, m_d-m_u$. The upper
bounds are not particularly interesting, but the lower ones are very tight;
specifically we find $$240 Mev\leq m_s; 16 Mev\leq m_d+m_u$$ if we assume
perturbative QCD to give a valid description of the correlator for $t\geq 2.2
Gev^2$; or, if it only holds for $t\geq 4.5 Gev^2$ then $$150 Mev\leq m_s; 10
Mev\leq m_d+m_u.$$ Here the masses are running masses defined at $1 Gev$. We
also show reasonable models where the bounds are saturated. The results suggest
that some of the current estimates of the light quark masses are less precise
than ordinarily claimed.


title: Is the solar neutrino deficit energy-dependent?

abstract:
  All existing measurements of the solar neutrino flux are compared with the
predictions of the most recent solar model by Bahcall and Pinsonneault,
modified by introducing the hypothesis of neutrino oscillations with mass
differences large enough to render energy-independent any quantity observable
on earth. It is concluded that the data are consistent with this hypothesis and
that, at least for the time being, any energy-dependence of the solar neutrino
deficit must be regarded as just an attractive theoretical possibility, but not
as a compelling reality.


title: What Have We Learned About and From F_L(x,Q^2) at HERA?

abstract:
  Recently the H1 collaboration has published a ``determination'' of the
structure function F_L(x,Q^2) at low x. I address the question of how reliable
this determination really is. I argue that it is in fact a consistency check of
a given theoretical approach rather than a real determination of the value of
F_L(x,Q^2), but potentially a very useful one. I compare the consistency of
different approaches, and indeed find that a LO--in--\alpha_s calculation of
structure functions is completely ruled out. I also find that the
``determined'' values of F_L(x,Q^2) are surprisingly stable under changes in
theoretical approach but, when working consistently within a well-defined
theoretical framework, the values of F_L(x,Q^2) implied are somewhat lower than
previously quoted.


title:
Primordial magnetic fields, anomalous isocurvature fluctuations and Big
  Bang nucleosynthesis

abstract:
  We show that the presence of primordial stochastic (hypercharge) magnetic
fields before the electroweak (EW) phase transition induces isocurvature
fluctuations (baryon number inhomogeneities). Depending on the details of the
magnetic field spectrum and on the particle physics parameters (such as the
strength of the EW phase transition and electron Yukawa couplings) these
fluctuations may survive until the Big Bang nucleosynthesis (BBN). Their
lenghtscale may exceed the neutron diffusion length at that time, while their
magnitude can be so large that sizable antimatter domains are present. This
provides the possibility of a new type of initial conditions for
non-homogeneous BBN or, from a more conservative point of view, stringent
bounds on primordial magnetic fields.


title: Cosmological Implications of Low Energy Supersymmetry Breaking Models

abstract:
  We show that stable local cosmic strings are a generic prediction of
supersymmetric models where supersymmetry is broken at scales within a few
orders of magnitude of the weak scale and is fed down to the observable sector
by gauge interactions. The typical energy scale of these strings is about
$10^2$ TeV. Since in the most general and natural scenario there are two
different sources of contributions to ordinary superpartner masses, gauge
mediation from the messanger sector and anomalous U(1) D-terms, novel features
are that the cosmic strings may be superconducting with the role of bosonic
charge carriers played by squarks and sleptons and that some baryonic or
leptonic charge may be stored in the core of the string. Possible cosmological
and astrophysical implications of these superconducting strings are discussed.


title: CP Asymmetry in B_d --> phi K_S: Standard Model Pollution

abstract:
  The difference in the time dependent CP asymmetries between the modes $B -->
psi K_S$ and $B --> phi K_S$ is a clean signal for physics beyond the Standard
Model. This interpretation could fail if there is a large enhancement of the
matrix element of the $b --> u ubar s$ operator between the $B_d$ initial state
and the $phi K_S$ final state. We argue against this possibility and propose
some experimental tests that could shed light on the situation.


title: Renormalization Group Scaling of the 1/m^2 HQET Lagrangian

abstract:
  The operator mixing matrix for the dimension six operators in the heavy quark
effective theory Lagrangian is computed at one loop. The results are shown to
be consistent with constraints from the equations of motion, and from
reparametrization invariance.


title:
Global Symmetries in Duals of Supersymmetric SU(N) x SU(M) and
  Application to Composite Axion

abstract:
  In this paper, we construct a supersymmetric composite axion (c-axion) model
based on the gauge group $SU(N)\times SU(M)$, which is one possible physical
application of the N=1 duality. The dual of SU(M) is interpreted as the color
gauge group. We illustrate the existence of c-axion for the case of one dual
quark in the dual gauge group $SU(\tilde M)$.


title: Mixed MSW and Vacuum Solutions of Solar Neutrino Problem

abstract:
  Assuming three flavour neutrino mixing takes place in vacuum, we investigate
the possibility that the solar $\nu_e$ take part in MSW transitions in the Sun
due to $\Delta m^2_{31} \sim (10^{-7} - 10^{-4})~eV^2$, followed by long wave
length vacuum oscillations on the way to the Earth, triggered by $\Delta
m^2_{21}$ (or $\Delta m^2_{32}$) $\sim (10^{-12} - 10^{-10})~eV^2$. The solar
$\nu_e$ survival probability is shown to be described in this case by a simple
analytic expression. New ranges of neutrino parameters which allow to fit the
solar neutrino data have been found. The best fit characterized by the minimum
$\chi^2$ is extremely good. This hybrid (MSW+vacuum oscillations) solution of
the solar neutrino problem leads to peculiar distortions of energy spectrum of
the boron neutrinos which can be observed by the SuperKamiokande and SNO
experiments. Other flavour scheme (e.g. 2 active $\nu$s + 1 sterile $\nu$) can
provide MSW+vacuum solution also.


title: Connecting Higgs and Confinement Phase of the 3d SU(2) Higgs Model

abstract:
  The mass spectrum of the 3d SU(2) Higgs model for states with quantum numbers
$0^{++}$, $2^{++}$ and $1^{--}$ as obtained from lattice simulations is
presented in the Higgs and confinement regions, both for a small and a large
scalar coupling. In the latter case it is possible to continuously connect the
spectra and observe the transition from confining to Higgs physics via decay of
flux loops.


title: Strongly Interacting Vector Bosons at TeV e+-e- Linear Colliders

abstract:
  In the absence of light Higgs bosons, the W and Z bosons become strongly
interacting particles at energies of about 1 TeV. If the longitudinal W,Z
components are generated by Goldstone modes associated with spontaneous
symmetry breaking in a new strong interaction theory, the quasi-elastic W,Z
scattering amplitudes can be predicted as a systematic chiral expansion in the
energy. We study the potential of TeV e+e- and e-e- linear colliders in
investigating these scattering processes. We estimate the accuracy with which
the coefficients of the chiral expansion can be measured in a multi-parameter
analysis. The measurements will provide us with a quantitative test of the
dynamics underlying the W,Z interactions.


title: The Role of M(W) in Precision Studies of the Standard Model

abstract:
  Recent calculations have significantly decreased the scheme and residual
scale dependence of basic radiative corrections of the Standard Electroweak
Model. This leads to a theoretically accurate prediction of the W-boson mass
M(W), as well as a reduced upper bound for the Higgs boson mass M(H). The
implications of a precise M(W) measurement on the M(H) estimate are emphasized.


title:
Calculations of One-Loop Supersymmetric Corrections to Large-E_T Jet
  Cross Sections

abstract:
  We have calculated the one-loop supersymmetric corrections to the 2 to 2
parton scattering subprocesses antiq q to antiq q, antiq q to g g, g q to g q
and g g to g g, including form-factor corrections and box diagrams with
internal squarks and gluinos of arbitrary mass. In general, these exhibit cusps
at the corresponding direct-channel sparticle thresholds. We use these
calculations to make numerical estimates of the possible threshold effects at
the Fermilab Tevatron collider and at the LHC, which depend on the rapidity
range selected, but can be as large as a few percent. These effects are diluted
in the integrated large-E_T cross section, where they are negative.


title: Non-linear dynamics of reheating

abstract:
  Resonant decay of the inflaton produces highly non-equilibrium states
dominated by interacting classical waves. We discuss several topics in the
theory of formation and evolution of such states.


title: Massiveness of Glueballs as Origin of the OZI Rule

abstract:
  The heaviness of the glueball mass scale is suggested as the source of the
OZI rule at low energy. The $J/\psi \to \rho\pi$ decay "anomaly" implies the
vector glueball $O$ has mass $m_O \approx m_{J/\psi}$. Such a heavy mass is
supported by other glueball studies. Glueball-meson matrix elements turn out to
be not suppressed at all at the 1 GeV scale, and a simple and intuitive picture
emerges which is consistent with the Gell-Mann-Okubo mass formula as well as
the measured sign of $\phi$-$\omega$ mixing. The suppression of glueball
mediated $\bar q_iq_i \longleftrightarrow \bar q_jq_j$ transitions and the
cancellation mechanism in two-step meson rescatterings are viewed as related by
duality. Extensions to the $2^{++}$, $3^{--}$ meson sectors, and failure for
$0^{\pm +}$ mesons are also discussed.


title: Supersymmetry-Breaking Models of Inflation

abstract:
  We consider dynamical models of supersymmetry breaking which naturally
incorporate cosmological inflation. The inflaton plays an inevitable role in
dynamical SUSY breaking and the hierarchical scales of inflation and SUSY
breaking are simultaneously realized through a single dynamics.


title: A Few Notes on Non-perturbative Parameters in Heavy Quark Expansion

abstract:
  Non-perturbative parameters to the order ${\cal O}({1 \over m_Q})$ in HQET
expansion, $\bar{ \Lambda}$, $\lambda_1$ and $\lambda_2$, as well as the
masses, $m_b$ and $m_c$, are estimated phenomenologically from $B$ and $D$
meson system spectroscopy. We found relatively large value of $m_b$ and quite
small value of $\bar{ \Lambda}$ compared to previous estimates.


title:
Nonperturbative correlation masses in the 3-dimensional
  SU(2)-Higgs-model

abstract:
  The corelation masses of the 3-dimensional SU(2)-Higgs-model are calculated
from the bound state Green's function. For a heavy-light and a light-light
system the results are reported. We compare with lattice data and find good
agreement.


title: A Strong Electroweak Sector with Decoupling at Low Energy

abstract:
  The phenomenology at future hadron colliders of a model with strong
interacting vector and axial vector bosons possessing a discrete symmetry
demanding mass degeneracy is presented.


title: Straight-line string in the einbein field formalism

abstract:
  The canonical description of the straight-line string is given in the einbein
field formalism. The system is quantized and Regge spectrum is reproduced. The
covariant analogue of the Newton-Wigner coordinate is found, and peculiarities
of the gauge fixing in \tau-reparametrization group are discussed.


title: Primordial Magnetic Fields and Their Development

abstract:
  In this talk I discuss the non-linear development of magnetic fields in the
early universe. I very briefly mention a number of particle physics mechanisms
for generating magnetic fields in the early universe, but the emphasis is on a
review of the field theoretic aspects of the developments of these fields,
mainly on the occurence of inverse cascades, i.e. generation of order from
disorder in the sense of transfer of energy from smaller to larger scales. In
this connection it is also briefly reviewed how the Silk effect (photon
diffusion) is counteracted by the inverse cascade.


title: Precise Predictions for the W-Boson Mass

abstract:
  Recent results for higher-order corrections to the relation between the
vector-boson masses in the Standard Model and Supersymmetry are summarized. In
the Standard Model, the Higgs-mass dependence of the two-loop contributions to
Delta r is studied. Exact results are given for the Higgs-dependent two-loop
corrections associated with the fermions, i.e. no expansion in the top-quark
and the Higgs-boson mass is made. The results for the top quark are compared
with results of an expansion up to next-to-leading order in the top-quark mass.
Agreement is found within 30 % of the two-loop result. In Supersymmetry, the
two-loop QCD corrections to the stop- and sbottom-loop contributions to the rho
parameter are presented. The two-loop corrections modify the one-loop
contribution by up to 30 %; the gluino decouples for large masses. Contrary to
the SM case where the QCD corrections are negative and screen the one-loop
value, the corresponding corrections in the supersymmetric case are in general
positive, increasing the sensitivity in the search for scalar quarks through
their virtual effects in high-precision electroweak observables.


title: The Electroweak Phase Transition - Standard and ``Beyond''

abstract:
  We first review why a strongly first-order phase transition needed for
baryogenesis is excluded in the electroweak standard model. We also comment on
some intriguing effects in the strongly interacting hot phase. In the MSSM with
a light stop a strongly first-order phase transition can be achieved. It
possibly proceeds in two stages.


title: Determination of Decuplet Baryon Magnetic Moments from QCD Sum Rules

abstract:
  A complete set of QCD sum rules for the magnetic moments of decuplet baryons
are derived using the external field method. They are analyzed thoroughly using
a Monte-Carlo based procedure. Valid sum rules are identified under the
criteria of OPE convergence and ground state dominance and their predictions
are obtained. The performances of these sum rules are further compared and a
favorable sum rule is designated for each member. Correlations between the
input and the output parameters are examined and large sensitivities to the
quark condensate magnetic susceptibility $\chi$ are found. Using realistic
estimates of the QCD input parameters, the uncertainties on the magnetic
moments are found relatively large and they can be attributed mostly to the
poorly-known $\chi$. It is shown that the accuracy can be improved to the 30%
level, provided the uncertainties in the QCD input parameters can be determined
to the 10% level. The computed magnetic moments are consistent with existing
data. Comparisons with other calculations are made.


title:
Direct hadron production and radial flow reduction as quark-gluon plasma
  signature

abstract:
  It is shown that due to contribution of the hadrons, emitted directly from
the inner hot region of central heavy ion collision, radial flow of the final
state hadrons is rather sensitive to the creation of quark-gluon plasma with
mixed phase.


title: Origins and renormalization of the superparticle spectrum

abstract:
  The importance of Yukawa contributions to the renormalization of the spectrum
in non-minimal supersymmetric models is illustrated in the cases of explicit
lepton number violation (leading to the possibility of singly produced
sneutrinos at LEP energies), an intermediate scale singlet neutrino and
negative mass squared parameters (possibly modifying fine-tuning
considerations), and a grand-unified sector. The relevance of model-dependent
renormalization to the supersymmetric flavor problem is emphasized. Sources of
the flavor problem, some of which are newly identified, as well as possible
solutions, are discussed and classified. It is then shown that gravitational
interactions could lead (via a quadratically divergent singlet) to simple
realizations of some of the low-energy frameworks that attempt to resolve the
flavor problem.


title: Can we extract short-distance information from B(K_L -> mu^+ mu^-)?

abstract:
  A new analysis of the long-distance two-photon dispersive amplitude of K_L ->
mu^+ mu^- is presented. We introduce a phenomenological parameterization of the
K_L -> gamma^* gamma^* form factor, constrained at low energies by K_L -> gamma
l^+ l^- (l = e,mu) data and at high energies by perturbative QCD. Using this
form factor we provide a reliable estimate of magnitude and relative
uncertainty of the two-photon dispersive contribution to K_L -> mu^+ mu^-. We
finally discuss the implications of this analysis for the extraction of
short-distance information from B(K_L -> mu^+ mu^-).


title:
Hadronic Spectral Moments in Semileptonic B Decays With a Lepton Energy
  Cut

abstract:
  We compute the first two moments of the final hadronic invariant mass in
inclusive semileptonic B decay, in the presence of a cut on the charged lepton
energy. These moments may be measured directly by experiments at the
Upsilon(4S) using the neutrino reconstruction technique, which requires such a
cut. Measurement of these moments will place constraints on the nonperturbative
parameters \bar\Lambda and \lambda_1, which are relevant for extracting the
quark masses m_b and m_c, as well as the CKM angle V_cb. We include terms of
order \alpha_s^2\beta_0 and 1/m_b^3 in the operator product expansion, and use
the latter to estimate the theoretical uncertainty in the extraction of
\bar\Lambda and \lambda_1.


title: Higgs-photon production at \mu\bar{\mu} colliders

abstract:
  We present cross sections for the reaction $\mu\bar{\mu}\to H\gamma$ over a
range of $\mu\bar{\mu}$ collider energies. The amplitudes for this process
receive tree level contributions and one-loop contributions, which are of
comparable magnitude. The tree level amplitudes are dominated by helicity
non-flip terms and the one-loop amplitudes are dominated by helicity flip
terms. As a consequence, the interference terms between the tree level and
one-loop contributions are negligible. For a 500 GeV $\mu\bar{\mu}$ collider,
the cross section for $H\gamma$ associated production approaches 0.1 fb.


title:
Towards an Effective Particle-String Resolution of the Cosmological
  Constant Problem

abstract:
  The Cosmological Constant Problem is re-examined from an effective field
theory perspective. While the connection between gravity and particle physics
has not been experimentally probed in the quantum regime, it is severely
constrained by the successes of Standard Model quantum field theory at short
distances, and classical General Relativity at large distances. At first sight,
it appears that combining particle physics and gravity inevitably leads to an
effective field theory below the weak scale which suffers from large radiative
corrections to the cosmological constant. Consequently, this parameter must be
very finely tuned to lie within the experimental bounds. An analog of just this
type of predicament, and its resolution, are described in some detail using
only familiar quantum field theory. The loop-hole abstracted from the analogy
is the possibility of graviton ``compositeness'' at a scale less than $10^{-2}$
eV, which cuts off the large contributions to the cosmological constant from
standard model physics. Experimentally, this would show up as a dramatic
breakdown of Newton's Law in upcoming sub-centimeter tests of gravity.
Currently, strings are the only known example of such compositeness. It is
proposed that the gravitational sector comprises strings of very low tension,
which couple to a stringy ``halo'' surrounding each point-like standard model
particle.


title:
Impact on SUSY-Breaking Models of the $R$-Parity Violating Squark
  Interpretation of the HERA Anomaly

abstract:
  The explanation of a 200 GeV R-parity violating squark to the HERA high-$Q^2$
anomaly would have an important impact on supersymmetry-breaking models. Here
we show that a squark of mass around 200 GeV is disallowed in the minimal
gauge-mediated SUSY-breaking models in the parameter space constrained by the
radiative electroweak-symmetry breaking and the experimental lower limits on
supersymmetric particles, even after including the large R-parity violating
couplings. Supergravity motivated models can, on the other hand, give rise to
these scalar quarks in a wide range of parameter space.


title: Precision Measurements Of Heavy Objects Working Group Summary

abstract:
  We report on the activities of the Precision Measurements Of Heavy Objects
working group of the Very Large Hadron Collider Physics and Detector Workshop.


title:
CP-violating dipole form factors of the top quark and tau lepton in
  scalar leptoquark models

abstract:
  We calculate the CP-violating electric and weak dipole form factors of the
top quark and the tau lepton in models with scalar leptoquarks coupling only to
the third generation of quarks and leptons. We obtain numerical values of the
real and imaginary parts of these form factors at various energies for
different values of leptoquark masses and couplings. The existing limits on the
tau electric and weak dipole form factors allows us to put a limit on the
masses and couplings of such leptoquarks and therefore on the top electric and
weak dipole form factors. We also discuss constraints on the form factors
coming from indirect limits on leptoquark masses and couplings deduced from LEP
results on Z properties.


title: CP Violation at Electron-Positron Colliders

abstract:
  A detailed, model-independent study of CP violation at present and future
electron-positron colliders is reported. Firstly, we investigate CP violation
effects in $W$ boson and $t$ quark pair production in $e^+e^-$ annihilation and
in two-photon fusion at a next $e^+e^-$ linear collider, where
Compton-backscattered laser light off the electrons or positrons are employed
as a powerful polarized photon source. Secondly, noting that there do not exist
any direct measurements for the tau-lepton electric dipole moment (EDM), we
address the importance of performing its direct measurements at $e^+e^-$
collisions off the Z-boson pole at TRISTAN, LEPII and CLEOII. We present a
rough comparison of the potential of these experiments in the $\tau$ EDM
measurements. Finally, we report on our recent works for probing CP violation
in the semileptonic decays of the tau lepton, which involve two different
intermediate resonances with large ratios of widths to masses, and which can be
most efficiently identified at the planned $B$ and proposed $\tau$-charm
factories. All the CP-violation phenomena in the processes under consideration,
if discovered, imply new CP-violation mechanisms completely different from the
Standard Model CP violation mechanism through the complex phase of the
Cabibbo-Kobayashi-Maskawa matrix.


title:
Two-loop anomalous dimension in light-cone gauge with
  Mandelstam-Leibbrandt prescription

abstract:
  All the next-to-leading order results on Altarelli-Parisi splitting functions
have been obtained in the literature either by using the operator product
expansion method or by making use of the Curci Furmanski Petronzio (CFP)
formalism in conjunction with light-like axial gauge, principal value (PV)
prescription and dimensional regularization. In this paper we present the
calculation of some non-singlet two-loop anomalous dimensions within the CFP
formalism using light-cone axial gauge with Mandelstam-Leibbrandt (ML)
prescription. We make a detailed comparison between the intermediate results
given by the (PV) versus the (ML) method. We point out that the (ML) method is
completely consistent and avoids the ``phenomenological rules'' used in the
case of (PV) regularization.


title: NLO QCD Analysis of Polarized Deep Inelastic Scattering

abstract:
  We have carried out a NLO analysis of the world data on polarized DIS in the
MS/bare scheme. We have studied two models of the parametrizations of the input
parton densities, the first due to Brodsky, Burkhardt and Schmidt (BBS) which
gives a simultaneous parametrization for both the polarized and unpolarized
densities and in which the counting rules are strictly imposed, the second in
which the input polarized densities are written in terms of the unpolarized
ones in the generic form Deltaq(x)=f(x)q(x) with f(x) some simple smooth
function. In both cases a good fit to the polarized data is achieved. As
expected the polarized data do not allow a precise determination of the
polarized gluon density. Concerning the polarized sea-quark densities, these
are fairly well determined in the BBS model because of the interplay of
polarized and unpolarized data, whereas in the second model, where only the
polarized data are relevant, the polarized sea-quark densities are largely
undetermined.


title: On the Parity Degeneracy of Baryons

abstract:
  The gross features of the observed baryon excitation spectrum below 2 GeV are
well explained if the spectrum generating algebra of its intrinsic orbital
angular momentum states is o(4)*su(2)_I. The spins of the resonances are
obtained through the coupling of a Lorentz bi-spinor (1/2,0)+ (0,1/ 2) to a
multiplet of the type (j,j) in its O(4)/O(3) reduction. The parities of the
resonances follow from those of the O(3) members of the (j,j) multiplets. In
this way relativistic SL(2,C) representations are constructed. For example, the
first S11, P11, and D13 states with masses around 1500 MeV fit into the (1/2,
1/2)* [(1/2,0)+(0,1/2)] representation. The observed parities of the resonances
correspond to natural parities of the (1/2,1/2) states. The second P11, S11,
D13- together with the first P13, F15, D15, and (a predicted) F17 -resonances,
centered around 1700 MeV, are organized into the (3/2,3/2)*[(1/2,0)+(0,1/2)]
representation. I argue that the members of the (3/2,3/2) multiplet carry
unnatural parities and that in this region chiral symmetry is restored. In the
N(939)- N(1650) transition the chiral symmetry mode is changed, and therefore,
a chiral phase transition is predicted to take place.


title:
Scaling of Z' exclusion limits and Z' measurements with energy,
  luminosity and systematic errors

abstract:
  The influence of the c.m. energy, integrated luminosity and systematic errors
on Z' exclusion limits and on errors of Z' model measurements is discussed.
Simple scaling laws are given for e+e-, pp (p (bar)p) and e+-p colliders and
compared with results of exact analyses.


title: Nuclear moments for the neutrinoless double beta decay

abstract:
  A derivation of the neutrinoless double beta decay rate, specially adapted
for the nuclear structure calculations, is presented. It is shown that the
Fourier-Bessel expansion of the hadronic currents, jointly with the angular
momentum recoupling, leads to very simple final expressions for the nuclear
form factors. This greatly facilitates the theoretical estimate of the half
life. Our approach does not require the closure approximation, which however
can be implemented if desired. The method is exemplified for the $\beta\beta$
decay $^{48}Ca \to ^{48}Ti$, both within the QRPA and a shell-model like model.


title: Electroweak interactions: a theoretical overview

abstract:
  This talk summarizes topical theoretical work for tests of the electroweak
standard model and of the minimal supersymmetric standard model (MSSM). The
status of the standard model and the MSSM is discussed in view of recent
precision data. A brief theoretical summary of the Working Group on Electroweak
Interactions is included.


title:
Universal Critical Equation of State and the Chiral Phase Transition in
  QCD

abstract:
  We employ non-perturbative flow equations to compute the equation of state
for two flavor QCD within an effective quark meson model. This yields the
temperature and quark mass dependence of quantities like the chiral condensate
or the pion mass. Our treatment covers both the chiral perturbation theory
domain of validity and the domain of validity of universality associated with
critical phenomena: We explicitly connect the physics at zero temperature and
realistic quark mass with the universal behavior near the critical temperature
$T_c$ and the chiral limit. For realistic quark masses the pion correlation
length near $T_c$ turns out to be smaller than its zero temperature value. In
the vicinity of $T_c$ and zero quark mass we obtain a precision estimate of the
universal critical equation of state. It belongs to the universality class of
the three dimensional O(4) symmetric Heisenberg model. We also investigate
scalar field theories directly in three dimensions near second order and first
order phase transitions. In particular, we obtain the universal equation of
state for weak first order phase transitions in scalar matrix models. We also
study the coarse grained free energy. Its dependence on the coarse graining
scale gives a quantitative criterion for the validity of Langer's theory of
spontaneous bubble nucleation.


title: Chiral Phase Transition from Non-Perturbative Flow Equations

abstract:
  We employ non-perturbative flow equations to compute the equation of state
for two flavor QCD within an effective quark meson model. Our treatment covers
both the chiral perturbation theory domain of validity and the domain of
validity of universality associated with critical phenomena. In the vicinity of
$T_c$ and zero quark mass we obtain a precision estimate of the universal
critical equation of state of the three dimensional O(4) symmetric Heisenberg
model. For realistic quark masses the pion correlation length near $T_c$ turns
out to be smaller than its zero temperature value.


title:
Group independent color decomposition of next-to-leading order matrix
  elements for e^+ e^- \to four partons

abstract:
  We present the next-to-leading order partonic cross sections involving an
electroweak vector boson and four massless partons (quarks, gluons or long
living gluinos) in a general gauge theory with a simple Lie Group. The vector
boson couples to a massless lepton pair and a quark-antiquark pair. The cross
sections are given in terms of group independent kinematical functions
multiplying the eigenvalues of the Casimir operators of the Lie group. This
kind of color decomposition is required for the calculation of O($\alpha_s^3$)
corrections to the group independent kinematical functions in the four-jet
production cross sections in electron-positron annihilation. The knowledge of
these corrections facilitates the simultaneous precision meaurement of the
strong coupling and the color charge factors using the four-jet LEP or SLC data
as well as the test whether these data favour or exclude the existence of a
light gluino.


title:
Excluding light gluinos using four-jet LEP events: a next-to-leading
  order result

abstract:
  Based upon a next-to-leading order perturbative calculation of the four-jet
production rate in electron-positron annihilation and assuming 8 % for the
theoretical error emerging from hadronization effects in the $0.002\le \ycut
\le 0.004$ range for the Durham clustering algorithm, we exclude the existence
of the light gluinos at the 95 % confidence level.


title: Four-jet production in $e^+e^-$ annihilation at next-to-leading order

abstract:
  We present a partonic Monte Carlo event generator that can be used for
calculating the group independent kinematical functions of any infrared safe
four-jet observable at NLO accuracy. As an example, we calculate the
differential distribution of the $\Pi_1$ and $\Pi_4$ Fox-Wolfram moments. We
find large K factors (K $>$ 2). The effect of the radiative correction is to
increase the overall normalization, but not to reduce the renormalization scale
dependence significantly.


title: Exclusive Photon-Photon Processes

abstract:
  Exclusive $\gamma\gamma \to$ hadron pairs are among the most fundamental
processes in QCD, providing a detailed examination of Compton scattering in the
crossed channel. In the high momentum transfer domain $(s,t,
{large},\theta_{cm}$ for $t/s$ fixed), these processes can be computed from
first principles in QCD, yielding important information on the nature of the
QCD coupling $\alpha_s$ and the form of hadron distribution amplitudes.
Similarly, the transition form factors $\gamma^*\gamma$, $\gamma^*\gamma \to
\pi^0, \eta^0,\eta^\prime,\eta_c ...$ provide rigorous tests of QCD and
definitive determinations of the meson distribution amplitudes $\phi_H(x,Q)$.
We show that the assumption of a frozen coupling at low momentum transfers can
explain the observed scaling of two-photon exclusive processes.


title: Power Corrections and Nonlocal Operators

abstract:
  We discuss power corrections to infrared safe cross sections and event
shapes, and identify a nonperturbative function that governs 1/Q corrections to
these quantities.


title:
Intermediate psuedoscalar resonance contributions to B->X_s photon
  photon

abstract:
  We calculate the decay rate B-> X_s photon photon via intermediate
psuedoscalar charmonium eta_c. This process is thought to be the main
long-distance contribution which dominates the corresponding inclusive rare B
decay. We point out that once the momentum dependence of eta_c-> photon photon
conversion strength, due to off-shellness of the intermediate eta_c, is taken
into account, the rate of this decay mode is reduced. The change in
differential decay rate in region of spectrum immediately below m_{eta_c} is
more significant. On the other hand, we point out that the unexpectedly large
branching ratio for B-> X_s eta' which is recently observed by CLEO could
indicate a potentially larger long-distance contribution via eta' resonance.


title: The Gluonic Decay of the $b$--Quark and tne $\eta '$--Meson

abstract:
  The observed inclusive decay of B-mesons into eta' + X is interpreted as the
consequence of the gluonic decay of the b-quark into an s-quark. As a result of
the QCD anomaly this decay proceeds partly as the decay b ---> s + eta',
similar to b ---> s + J/psi. The hadronic recoiling system is found to have a
relatively large mass. Analogously one expects a decay of the type b ---> s +
sigma. The branching ratios for these decays are large (of the order of 10%).
The results indicate that there is no room for an anomalously large
chromomagnetic decay mode of the b-quark. Gluon jets are expected to exhibit an
anomalously large tendency to fragment into eta'- and sigma-mesons.


title: Quarkonium Photoproduction at Next-to-leading Order

abstract:
  We present the calculation of O(as^2 aem) corrections to heavy-quarkonium
total photoproduction cross-sections. Results are given for the colour-octet
component of S and P waves. The calculation is performed using covariant
projectors in dimensional regularization. A phenomenological study of the
results, including a discussion of the high-energy behaviour of the cross
sections, is presented. For gamma-p energies up to few hundred GeV the NLO
corrections significantly reduce the scale dependence of the production rates
relative to the Born-level results. Large small-x corrections arise at higher
energies, making the predictions strongly dependent on the shape of the gluon
density and on the choice of factorization scale.


title:
Next-to-Leading Order QCD Corrections and Massive Quarks in $e^+e^-\to
  3$ Jets

abstract:
  We present in detail a calculation of the next-to-leading order QCD
corrections to the process $e^+e^-\to 3$ jets with massive quarks. To isolate
the soft and collinear divergencies of the four parton matrix elements, we
modify the phase space slicing method to account for masses. Our computation
allows for the prediction of oriented three jet events involving heavy quarks,
both on and off the Z resonance, and of any event shape variable which is
dominated by three jet configurations. We show next-to-leading order results
for the three jet fraction, the differential two jet rate, and for the thrust
distribution at various c.m. energies.


title:
General constraints on light resonances in a strongly coupled symmetry
  breaking sector

abstract:
  In this paper we consider the information that can be obtained about a
strongly-interacting symmetry breaking sector from precision measurements of
four-fermion processes at LEP2 or a (500 GeV) NLC . Using a ``Z-peak''
subtracted approach to describe four-fermion processes, we show that
measurements of the cross section for muon production, the related
forward-backward asymmetry, and the total cross section for the production of
hadrons (except $t$'s) can place constraints on (or measure the effectsof) the
lightest vector or axial resonances present in a strong symmetry breaking
sector. We estimate that such effects will be visible at LEP2 for resonances of
masses up to approximately 350 GeV, and at a 500 GeV NLC for resonances of
masses up to approximately 800 GeV. Multiscale models, for example, predict the
presence of light vector and axial mesons in this mass range and their effects
could be probed by these measurements.


title:
Triple Gauge Boson Production and Dynamical Symmetry Breaking at the
  Next Linear Collider

abstract:
  We study in a model independent way the role of a techniomega resonance in
the process e^+ e^- --> W^+ W^- Z at the Next Linear Collider.


title: Threshold Resummation for QCD Hard Scattering

abstract:
  We describe the resummation of singular distributions at partonic threshold
in heavy quark production, generalizing results for Drell-Yan and other
electroweak hard-scattering processes.


title: Elementarity in Open Systems - Unstable Particle Decay in Medium -

abstract:
  The problem of unstable particle decay is discussed to show how elementarity
of a subsystem immersed in an infinitely larger environment is lost. The decay
law, when the same kind of particles as decay product make up a thermal medium,
is worked out in detail. The relic abundance of unstable particles does not
suffer from the Boltzmann suppression crucial at very low temperatures, because
the off shell contribution not considered in the Boltzmann approach, becomes
dominant at low temperatures. The short-time behavior of the non-decay
probability is also clarified, which is important to discuss physical relevance
of the non-observation of nucleon decay. Two powerful methods in this respect
are the operator and the path integral approach, both of which are reviewed.


title: Chiral Perturbation Theory for Tensor Mesons

abstract:
  Interactions of $a_2, K^*_2, f_2$ and $f_2'$ tensor-mesons with low-energy
$\pi, K, \eta, \eta'$ pseudo-scalar mesons are constrained by chiral symmetry.
We derive a chiral Lagrangian of tensor mesons in which the tensor mesons are
treated as heavy non-relativistic matter fields. Using $1/N_c$ counting, we
derive relations among unknown couplings of the chiral Lagrangian. Chiral
perturbation theory is applied to the tensor-meson mass matrix. At one-loop
there are large corrections to the individual tensor meson masses, but the
singlet-octet mixing angle remains almost unchanged. We argue that all heavy
mesons of spin $\ge 1$ share common feature of chiral dynamics.


title: Using B_s^0 Decays to Determine the CP Angles \alpha and \gamma

abstract:
  Dighe, Gronau and Rosner have shown that, by assuming SU(3) flavor symmetry
and first-order SU(3) breaking, it is possible to extract the CP angles \alpha
and \gamma from measurements of the decay rates of B_d^0(t) --> \pi^+\pi^-,
B_d^0 --> \pi^- K^+ and B^+ --> \pi^+ K^0, along with their charge-conjugate
processes. We extend their analysis to include the SU(3)-related decays B_s^0
--> \pi^+ K^-, B_s^0(t) --> K^+ K^- and B_s^0 --> K^0 {\bar K^0}. There are
several advantages to this extension: discrete ambiguities are removed, fewer
assumptions are necessary, and the method works even if all strong phases
vanish. In addition, we show that \gamma can be obtained cleanly, with no
penguin contamination, by using the two decays B_s^0(t) --> K^+ K^- and B_s^0
--> K^0 {\bar K^0}.


title:
CP Violation In Single Top Production And Decay Via p p-bar -> t b-bar
  +X -> W^+ b b-bar +X Within The MSSM: A Possible Application For Measuring
  \arg(A_t) At Hadron Colliders

abstract:
  CP-nonconserving effects in the reaction p p-bar -> t b-bar +X -> W^+ b b-bar
+X, driven by the supersymmetric CP-odd phase of the stop trilinear soft
breaking term, \arg(A_t), are studied. We discuss the CP-nonconserving effects
in both production and the associated decay amplitudes of the top. We find
that, within a plausible low energy scenario of the MSSM and keeping the
neutron electric dipole moment below its current limit, a CP-violating
cross-section asymmetry as large as 2-3% can arise if some of the parameters
lie in a favorable range. A partial rate asymmetry originating only in the top
decay t -> W^+ b is found to be, in general, below the 0.1% level which is
somewhat smaller than previous claims. For a low \tan\beta of order one the
decay asymmetry can reach at the most ~0.3%. This (few) percent level overall
CP-violating signal in p p-bar -> t b-bar +X -> W^+ b b-bar +X might be within
the reach of the future 2(4) TeV pp-bar Tevatron collider that may be able to
produce ~10000(~30000) such tb-bar events with an integrated luminosity of 30
fb^{-1}. In particular, it may be used to place an upper bound on \arg(A_t) if
indeed \arg(\mu) -> 0, as implied from the present experimental limit on the
neutron electric dipole moment. The partial rate asymmetry in the top decay
(~few \times 10^{-3}) may also be within the reach of the LHC with ~10^7 pairs
of tt-bar produced, provided detector systematics are sufficiently small. We
also show that if the GUT-scale universality of the soft breaking trilinear $A$
terms is relaxed, then the phases associated with \arg A_u and \arg A_d can
take values up to ~few \times 10^{-1} even with squarks and gluino masses of
several hundred GeV's without contradicting the experimental limit on the
neutron electric dipole moment.


title:
Implications of a W^+W^- (ZZ) - Higgs - t c-bar$ Interaction for e^+e^-
  -> t c-bar \nu_e \nu_e-bar, t c-bar e^+ e^-, t c-bar Z and for t -> cW^+W^-,
  cZZ in a Two Higgs Doublet Model

abstract:
  The Standard Model with one extra Higgs doublet may give rise to enhanced
TREE-LEVEL flavor-changing-scalar coupling of a neutral Higgs to a pair of
top-charm quarks. This coupling may drive a large TREE-LEVEL effective
W^+W^-(ZZ) - Higgs - t c-bar interaction. As a result we find that the
reactions e^+e^- -> t c-bar \nu_e \nu_e-bar, t c-bar e^+ e^-, t c-bar Z and the
two rare top decays t -> cW^+W^-, t -> cZZ become very sensitive probes of such
an effective interaction. The most promising ones, e^+e^- -> t c-bar \nu_e
\nu_e-bar, t c-bar e^+ e^-, may yield several hundreds and up to thousands of
such events at the Next Linear Collider with a center of mass energy of
\sqrt{s}=0.5 - 2 TeV if the mass of the lightest neutral Higgs is a few hundred
GeV. The rare decays t -> cW^+W^- and t -> cZZ may be accessible at the LHC if
the mass of the lightest neutral Higgs lies in the narrow window 150 GeV < m_h
< 200 GeV.


title:
On the possibility of distinguishing between Majorana and Dirac
  neutrinos

abstract:
  We clarify that one cannot distinguish between Majorana and Dirac neutrinos
in the limit of vanishing neutrino mass. In particular we show, that the
forward-backward asymmetry in the reaction e^+ e^- -> \nu \nu is the same for
\nu_M and \nu_D, in contrast to recent claims made in the literature.


title:
Real Time Correlation Functions at Finite Temperature and their
  Classical Limit

abstract:
  In order to investigate the reliability of the classical approximation for
non-perturbative real time correlation functions at finite temperature we study
the two-point correlator for the anharmonic oscillator. For moderately large
times the classical limit gives a good approximation of the quantum result but
after some time $t_*$ the classical approximation breaks down even at high
temperature.


title: New Probes of Supersymmetry Beyond the Minimal Framework

abstract:
  If supersymmetry is discovered at future colliders, what can we learn? While
our appreciation of the variety of possible supersymmetric models has grown
tremendously in recent years, most attempts to answer this question have been
in the context of some simple and highly restrictive framework, such as minimal
supergravity. In this talk I describe new probes of phenomena that are generic
in models beyond the minimal framework. These include tests of supersymmetric
flavor and CP violation and probes of kinematically inaccessible superparticle
sectors through ``super-oblique corrections.'' Such probes have wide
applicability to distinguishing models, from gravity- and gauge-mediated
theories to hybrid models and models with flavor symmetries. Examples of
measurements at LEP II, the LHC, and the NLC are given.


title: Deeply Inelastic Hadronic Final States: QCD Corrections

abstract:
  The status of the calculation of next-to-leading-order QCD corrections to
hadronic final states in deeply inelastic scattering is reviewed, and an
overview of the phenomenology (including the measurement of the strong coupling
constant and the gluon density via jet rates) is given. We also describe a new
universal program (DISASTER++) for the calculation of (2+1)-jet observables.


title:
Equilibrium and Non-Equilibrium Hard Thermal Loop Resummation in the
  Real Time Formalism

abstract:
  We investigate the use of the hard thermal loop (HTL) resummation technique
in non-equilibrium field theory. We use the Keldysh representation of the real
time formalism (RTF). We derive the HTL photon self energy and the resummed
photon propagator. We show that no pinch singularities appear in the
non-equilibrium HTL effective propagator. We discuss a possible regularization
mechanism for these singularities at higher orders. As an example of the
application of the HTL resummation method within the RTF we discuss the damping
rate of a hard electron.


title:
Anomalous U(1), Gauge-Mediated Supersymmetry Breaking and Higgs as
  Pseudo-Goldstone Bosons

abstract:
  We study the breaking of supersymmetry in models with anomalous U(1). These
models are simple to construct and contain natural candidates for being the
messengers of gauge-mediated supersymmetry breaking. When some of the ordinary
matter fields transform under the anomalous U(1), we find a hybrid scenario in
which the U(1) and the gauge interactions mediate the breaking of
supersymmetry. This leads to a hierarchy of soft masses between the charged and
neutral fields and provides a solution to the $\mu$-problem. Among these
models, we present a scenario in which the Higgs arises as a pseudo-Goldstone
boson. This scenario naturally allows for values of the $\mu$-term and the
scalar soft masses larger than the weak scale.


title: Chiral symmetry and mixing of axial and vector correlators in matter

abstract:
  The effect of mixing of the vector and axial vector correlation functions in
the nuclear medium arising from the interaction of nuclear pions with
corresponding interpolating currents is considered. It is shown that the mass
difference between $\rho$ and $a_1$ meson gets smaller with the increase of the
nuclear density reflecting the phenomena of partial restoration of chiral
symmetry whereas the absolute values of meson masses may both decrease and
increase in nuclear medium depending on the model used for the phenomenological
spectral density.


title: On the Parametrization of Flavor Mixing in the Standard Model

abstract:
  It is shown that there exist nine different ways to describe the flavor
mixing, in terms of three rotation angles and one CP-violating phase, within
the standard electroweak theory of six quarks. For the assignment of the
complex phase there essentially exists a continuum of possibilities, if one
allows the phase to appear in more than four elements of the mixing matrix. If
the phase is restricted to four elements, the phase assignment is uniquely
defined. If one imposes the constraint that the phase disappears in a natural
way in the chiral limit in which the masses of the u and d quarks are turned
off, only three of the nine parametrizations are acceptable. In particular the
``standard'' parametrization advocated by the Particle Data Group is not
permitted. One parametrization, in which the CP-violating phase is restricted
to the light quark sector, stands up as the most favorable description of the
flavor mixing.


title:
O(\alpha_s) Corrections to Longitudinal Spin-Spin Correlations in e+e-
  -> q qbar

abstract:
  We calculate the $O(\alpha_s)$ corrections to longitudinal spin-spin
correlations in $e^+e^-\to q\bar q$. For top quark pair production the
$O(\alpha_s)$ corrections to the longitudinal spin-spin asymmetry amount to
less than 1% in the $q^2$-range from above $t\bar t$-treshold up to
$\sqrt{q^2}= 1000 GeV$. In the $e^+e^-\to b\bar b$ case the $O(\alpha_s)$
corrections reduce the asymmetry value from its $m=0$ value of -1 to
approximately -0.96 for $q^2$-values around the Z-peak. This reduction can be
traced to finite anomalous contributions from residual mass effects which
survive the $m\to 0$ limit. We discuss the role of the anomalous contributions
and the pattern of how they contribute to spin-flip and no-flip terms.


title:
One-Loop Minimization Conditions in the Minimal Supersymmetric Standard
  Model

abstract:
  We study, in the Minimal Supersymmetric Standard Model, the electroweak
symmetry breaking conditions obtained from the one-loop effective potential.
Novel model-independent lower and upper bounds on $\tan \beta$, involving the
other free parameters of the model, are inferred and determined analytically.
We discuss briefly some of the related issues and give an outlook for further
applications.


title: Supernova Constraints on a Superlight Gravitino

abstract:
  In supergravity models with low supersymmetry breaking scale the gravitinos
can be superlight with mass in the micro-eV to keV range. In such a case,
gravitino emission provides a new cooling mechanism for protoneutron stars and
therefore can provide constraints on the mass of the superlight gravitino. This
happens because the coupling to matter of superlight gravitinos is dominated by
its goldstino component, whose coupling to matter is inversely proportional to
the scale of supersymmetry breaking and increases as the gravitino mass
decreases. Present observations therefore provide lower limits on the gravitino
mass. Using recently revised goldstino couplings, we find that the two dominant
processes in supernova cooling are $e^+e^-\to \tilde{G}\tilde{G}$ and
$\gamma+e^-\to e^-\tilde{G}\tilde{G}$. They lead to lower limits on the
supersymmetry breaking scale $\Lambda_{S}$ from 160 to 500 GeV for core
temperatures 30 to 60 MeV and electron chemical potentials 200 to 300 MeV. The
corresponding lower limits on the gravitino mass are $.6 - 6\times 10^{-6}$ eV.


title: Hadronic Form Factors and Perturbative QCD

abstract:
  The electromagnetic form factors of hadrons at large momentum transfer have
been the subject of intense theoretical and experimental scrutiny over the past
two decades, yet there is still not a universally-accepted framework for their
description. This review is a synopsis of their current status at large
momentum transfer. The basic theoretical approaches to form factors at large
momentum transfer are developed, emphasizing the valence quark and Feynman
(soft) pictures. The discussion includes the relation of these descriptions to
the parton model, as well as the roles of factorization, evolution, Sudakov
resummation and QCD sum rules. This is followed by a discussion of the
experimental status of pion and nucleon elastic form factors and resonance
production amplitudes in the light of recent data, highlighting the successes
and shortcomings of various theoretical proposals.


title: The $q \bar{q}$ relativistic interaction in the Wilson loop approach

abstract:
  We study the $q \bar{q}$ relativistic interaction starting from the
Feynman-Schwinger representation of the gauge-invariant quark-antiquark Green
function. We focus on the one-body limit and discuss the obtained
non-perturbative interaction kernel of the Dirac equation.


title: Non-Abelian Dipole Radiation and the Heavy Quark Expansion

abstract:
  Dipole radiation in QCD is derived to the second order in $\alpha_s$. A
power-like evolution of the spin-singlet heavy quark operators is obtained to
the same accuracy. In particular, ${\cal O}(\alpha_s^2)$ relation between a
short-distance low-scale running heavy quark mass and the $\barMS$ mass is
given. We discuss the properties of the effective QCD coupling $\aw(E)$ which
governs the dipole radiation. This coupling is advantageous for heavy quark
physics.


title:
Pair production of W bosons at the photon linear collider: a window to
  the electroweak symmetry breaking?

abstract:
  Recent progress in calculating O(alpha) electroweak corrections to W+W- pair
production in photon-photon collisions is reviewed. The potential of the Photon
Linear Collider to study anomalous W couplings is discussed.


title: chi^2 Analysis of Supersymmetric Models

abstract:
  We discuss the results of a global fit to precision data in supersymmetric
models. We consider both gravity- and gauge-mediated models. As the
superpartner spectrum becomes light, the global fit to the data typically
results in larger values of chi^2. We indicate the regions of parameter space
which are excluded by the data. We discuss the additional effect of the B(B -->
X_s\gamma) measurement. Our analysis excludes chargino masses below MZ in the
simplest gauge-mediated model with mu>0, with stronger constraints for larger
values of tan beta.


title: Flux-Bubble Models and Mesonic Molecules

abstract:
  It has been shown that the string-flip potential model reproduces most of the
bulk properties of nuclear matter, with the exception of nuclear binding.
Furthermore, it was postulated that this model, with the inclusion of the
colour-hyperfine interaction, should produce binding. In some recent work a
modified version of the string-flip potential model was developed, called the
flux-bubble model, which would allow for the addition of perturbative QCD
interactions. In attempts to construct a simple $q\bar q$ nucleon system using
the flux-bubble model (which only included colour-Coulomb interactions)
difficulties arose with trying to construct a many-body variational wave
function that would take into account the locality of the flux-bubble
interactions. In this talk we consider a toy system, a mesonic molecule in
order to understand these difficulties. En route, a new variational wave
function is proposed that may have a significant enough impact on the old
string-flip potential model results that the inclusion of perturbative effects
may not be needed.


title: Baryogenesis at the Electroweak Scale and Above

abstract:
  We consider origins of the baryon asymmetry which we observe today. We review
the progress of electroweak-scale baryogenesis, and show a new mechanism,
string-scale baryogenesis.


title:
Phenomenological Aspects of a Direct-transmission Model of Dynamical
  Supersymmetry Breaking with the Gravitino Mass $m_{3/2} < 1~\KEV$

abstract:
  We analyze a direct-transmission model of dynamical SUSY breaking previously
proposed. In the model the gravitino mass is naturally smaller than $1~\KEV$,
which is required from the standard cosmology. We find that there are many
distinguishable features from in other models: for example the so-called GUT
relation among the gaugino masses does not hold even if we consider the GUT
models. Furthermore, the gauginos are always lighter than the sfermions since
the gaugino masses have extra suppression factors. We also discuss a collider
signature ``$\gamma \gamma +$ missing energy'' in the present model.


title: Gluon Polarization in Nucleons

abstract:
  In QCD the gauge-invariant gluon polarization Delta G in a nucleon can be
defined either in a non-local way as the integral over the Ioffe-time
distribution of polarized gluons, or in light-cone gauge as the forward matrix
element of the local topological current. We have investigated both
possibilities within the framework of QCD sum rules. Although the topological
current is built from local fields, we have found that its matrix element
retains sensitivity to large longitudinal distances. Because QCD sum rules
produce artificial oscillations of the Ioffe-time distribution of polarized
glue at moderate and large light-like distances, the calculation of the matrix
element of the topological current results in a small value of Delta G(mu^2 = 1
GeV^2) = 0.6 \pm 0.2. In a more consistent approach QCD sum rules are used to
describe the polarized gluon distribution only at small light-like distances.
Assuming that significant contributions to Delta G arise only from longitudinal
length scales not larger than the nucleon size leads to Delta G(mu^2 = 1 GeV^2)
= 2 \pm 1.


title: From Sets to Quarks

abstract:
  From sets and simple operations on sets, a Feynman Checkerboard physics model
is constructed that allows computation of force strength constants and
constituent mass ratios of elementary particles, with a Lagrangian structure
that gives a Higgs scalar particle mass of about 146 GeV and a Higgs scalar
field vacuum expectation value of about 252 GeV, giving a tree level
constituent Truth Quark (top quark) mass of roughly 130 GeV, which is (in my
opinion) supported by dileptonic events and some semileptonic events. See
http://galaxy.cau.edu/tsmith/HDFCmodel.html and
http://www.innerx.net/personal/tsmith/HDFCmodel.html
  Chapter 1 - Introduction.
  Chapter 2 - From Sets to Clifford Algebras.
  Chapter 3 - Octonions and E8 lattices.
  Chapter 4 - E8 spacetime and particles.
  Chapter 5 - HyperDiamond Lattices.
  Chapter 6 - Internal Symmetry Space.
  Chapter 7 - Feynman Checkerboards.
  Chapter 8 - Charge = Amplitude to Emit Gauge Boson.
  Chapter 9 - Mass = Amplitude to Change Direction.
  Chapter 10 - Protons, Pions, and Physical Gravitons.


title: Effective equation of state for a spherically expanding pion plasma

abstract:
  Following a relativistic heavy ion collision, the quark-gluon plasma produced
eventually undergoes a chiral phase transition. We assume that during this
phase transition one can describe the dynamics of the system by the linear
$\sigma$ model and that the expansion can be thought of as mostly radial.
Because the $\sigma$ model is an effective field theory there is an actual
momentum cutoff (Landau pole) in the theory at around 1 GeV. Thus it is
necessary to find ways of obtaining a covariantly conserved, renormalized
energy-momentum tensor when there is a cutoff present (which breaks
covariance), in order to identify the effective equation of state of this time
evolving system. We show how to solve this technical problem and then determine
the energy density and pressure of the system as a function of the proper time.
We consider different initial conditions and search for instabilities which can
lead to the formation of disoriented chiral condensates (DCCs). We find that
the energy density and pressure both decrease quickly, as is appropriate for a
rapidly cooling system, and that the energy is numerically conserved.


title: Crossover and mass gap of the SU(2)-Higgs model at high temperature

abstract:
  Analytic estimates of screening masses in the symmetric, high-temperature
phase of the SU(2)-Higgs model are reviewed. The size of the mass gap in the
symmetric phase is closely related to the critical Higgs mass where the
first-order electroweak phase transition changes to a smooth crossover. We also
discuss some conjectures concerning the connection between the screening masses
of propagators in a fixed gauge and screening masses of gauge-invariant
operators.


title:
Leading logarithmic QCD corrections to the B_s --> \gamma \gamma decays
  in the two Higgs doublet model

abstract:
  We calculate the leading logarithmic QCD corrections to the decay B_s -->
\gamma \gamma in the two Higgs doublet model (2HDM) including O_7 type long
distance effects and estimate the restrictions of the 2HDM parameters, tan\beta
and m_H, using the experimental data of B --> X_s \gamma decay provided by the
CLEO collaboration. A lower bound for the charged Higgs mass m_H as a function
of the renormalization scale \mu is given for 2HDM model II. We further present
the dependencies of the branching ratio Br(B_s --> \gamma \gamma) and the ratio
|A^{+}|^2/|A^{-}|^2 on m_H and tan\beta including leading logarithmic QCD
corrections. The dependence on the renormalization scale is found to be strong
for both ratios. An additional uncertainty arises from the variation of the
parameters of the bound state model, (m_b, \bar{\Lambda}_s). We see, that to
look for charged Higgs effects the measurement of the branching ratio Br(B_s
--> \gamma \gamma) is promising.


title: Early stages of growth of QCD and electroweak bubbles

abstract:
  The dynamical growth rate of bubbles nucleating in relativistic plasma in
thermal first-order phase transitions is analyzed. The framework is a
hydrodynamical model which consists of relativistic fluid and an order
parameter field. The results of analytical approximations and numerical
simulations coincide well.


title:
Time-violating rotation of the electromagnetic wave polarization plane
  by a diffractional grating

abstract:
  The equations describing the T-violating photon scattering by a diffraction
grating have been obtained. It is shown, that the T-violating rotation of the
photon polarization plane appear under diffraction in a noncenter symmetrical
diffraction grating. The rotation angle gives rise sharply, when the conditions
of the photon resonance transmission are satisfied.


title: Decay of Z-string due to the fermion emission

abstract:
  The question of classical topological stability of the gauge vortex defects
is reanalyzed upon taking into account the quantum perturbative effects. The
purely Abelian Higgs string remains stable while the coupling of the
effectively Abelian Z-string (with the fixed zero upper component of the scalar
doublet) to the fermions of the minimal standard model is shown to result in
its decay, via the fermionic pair emission. The decay rate is scaled as
$10^{-1}$ of the decay rate of $Z^0$ boson. The influence of the surrounding
charge-asymmetric fermionic matter is considered, demonstrating the dependence
of the decay rate on the contour shape and its suppression at sufficiently
large charge asymmetry.


title: Ultraviolet dominance of power corrections in QCD?

abstract:
  I explain current theoretical ideas on higher-twist (hadronization)
corrections to physical observables in QCD.


title: Current Issues in CP Violation

abstract:
  A brief review of CP violation in $K$ and $B$ decays is given. While the
observables $\varepsilon$ and Re$(\varepsilon'/\varepsilon)$ describing CP
violation in neutral $K$ decays do not allow a powerful test of the CKM
mechanism of CP violation, rare $K\to\pi\nu\overline{\nu}$ decays and in
particular the $B$-meson system are much more promising in this respect. After
a brief look at the $K$ system, selected aspects of CP-violating effects in $B$
decays are discussed. It is pointed out that combined branching ratios for
$B\to\pi K$ modes, which have been observed recently by the CLEO collaboration,
may allow to derive stringent constraints on the CKM angle $\gamma$ that could
open a window to new physics.


title: On the Mellin Transform of the Coefficient Functions of $F_L(x,Q^2)$

abstract:
  The Mellin-transforms of the next-to-leading order Wilson coefficients of the
longitudinal structure function are evaluated.


title: The $q \bar{q}$ semirelativistic interaction in the Wilson loop approach

abstract:
  The complete $ q\bar{q}$ semirelativistic interaction is obtained as a
gauge-invariant function of the Wilson loop and its functional derivatives. The
approach is suitable for analytic evaluations as well as for lattice
calculations. Here we consider three different models for the Wilson loop
non-perturbative behaviour and discuss the related semirelativistic dynamics.


title: A matching of matrix elements and parton showers

abstract:
  We propose a simple scheme to start a parton-shower evolution description
from a given jet configuration in $e^+ e^-$ annihilation events. This allows a
convenient combination of the full angular information content of matrix
elements with the detailed sub-jet structure of parton showers, and should give
a realistic overall description of event properties. Explicit studies with this
hybrid approach are presented for the four-jet case, as a simple testing ground
of the ideas.


title: Nucleon contribution to the neutrino electromagnetic vertex in matter

abstract:
  We calculate the nucleon contribution to the electromagnetic vertex of a
neutrino in a background of particles, including the effect of the anomalous
magnetic moment of the nucleons. Explicit formulas for the form factors are
given in various physical limits of practical interest. Several applications of
the results are mentioned, including the effect of an external magnetic field
on the dispersion relation of a neutrino in matter.


title: Extracting Parton Densities from Collider Data

abstract:
  Collider data can play an important role in determining the parton
distribution functions of the nucleon. I present a formalism which makes it
possible to use next-to-leading order calculations in such a determination,
while minimizing the amount of numerical computation required.