title: Search for Neutral Heavy Leptons in the NuTeV Experiment at Fermilab

abstract:
  Preliminary results from a search for neutral heavy leptons in the NuTeV
experiment at Fermilab. The upgraded NuTeV neutrino detector for the 1996-1997
run included an instrumented decay region for the NHL search which, combined
with the NuTeV calorimeter, allows detection in several decay modes (mu-mu-nu,
mu-e-nu, mu-pi, e-pi, and e-e-nu). We see no evidence for neutral heavy leptons
in our current search in the mass range from 0.3 GeV to 2.0 GeV decaying into
final states containing a muon.


title: Review of tau lifetime measurements

abstract:
  The measurements of the mean lifetime of the tau lepton are reviewed. The
conditions for measuring the lifetime at various e+e- colliders are compared
and the analysis methods are briefly described. The new developments since the
previous Workshop on Tau Lepton Physics are listed. The world average is
tau_tau = 290.5 +- 1.0 fs. The LEP experiments dominate this average and have
analyzed nearly all of their data. In anticipation of the next era of precision
measurements at CLEO and the b factories, the important sources of systematic
errors and the treatment of systematic biases are discussed.


title:
New Limit on Muon and Electron Lepton Number Violation from $K^0_L \to
  \mu^\pm e^\mp$ Decay

abstract:
  The most sensitive experiment to date to search for the muon and electron
lepton number violating decay $K^0_L \to \mu^\pm e^\mp$ has detected no events
consistent with this process. Based on this result, the 90% confidence level
upper limit on the branching fraction is $B(K^0_L \to \mu^\pm e^\mp) <
4.7\times10^{-12}$.


title: Single W Production at LEP2

abstract:
  Single W and single gamma productions which are sensitive to the trilinear
gauge coupling WWgamma have been studied at LEP. It isshown that single W
production has particular sensitivity to the "anomalous" magnetic moment Kgamma
of the W boson, complementary to WW production at LEP and Wgamma production at
hadron colliders. The invisible decay of W boson has been searched and the
limit on the invisible decay width of 27 MeV at 95% C.L. has been obtained.


title: Background and Technical Studies for GENIUS as a Dark Matter Experiment

abstract:
  The GENIUS project is a proposal for a new dark matter detector, with an
increased sensitivity of three orders of magnitude relative to existing direct
dark matter detection experiments. We performed a technical study and
calculated the main background sources for the relevant energy region in a
detailed detector geometry. The achieved overall background level and detector
performance confirm the outstanding potential of GENIUS as a powerful tool for
the direct search of WIMPs in our Galaxy.


title: W physics at LEP

abstract:
  A summary of the W-boson properties measured by the four LEP collaborations
is presented here. These properties are updated to take into account the most
recent results presented at the ICHEP98 conference.


title: Measurement of the $B\to D\ell\nu$ Branching Fractions and Form Factor

abstract:
  Using a sample of 3.3 million B-meson decays collected with the CLEO detector
at the Cornell Electron Storage Ring, we have studied $B^- \to D^0 \ell\nu$ and
$\bar{B}^0 \to D^+ \ell\nu$ decays, where $\ell$ can be either an electron or
muon. We distinguish $B \to D \ell\nu$ from other B semileptonic decays by
examining the net momentum and energy of the particles recoiling against the
D-lepton pairs. We find the decay rate $\Gamma(B \to D\ell\nu)$ = (14.1 +- 1.0
+- 1.2) ns-1 and derive branching fractions for $B^- \to D^0 \ell\nu$ and
$\bar{B^0} \to D^+ \ell\nu$ of (2.32 +- 0.17 +- 0.20)% and 2.20 +- 0.16 +-
0.19)% respectively, where the uncertainties are statistical and systematic. We
also investigate the $B \to D \ell\nu$ form factor and the implication of the
result for $|V_{cb}|$.


title: CLEO Results on Tau Michel Parameters

abstract:
  We present measurements of the tau Michel Parameters made by the CLEO
experiment. Three different analyses are performed: a spin-independent lepton
spectrum analysis and a second spin-dependent analysis using $\ell^\pm$ \vs\
$\pi^\mp\pi^0$ events, and a third spin-dependent analysis using $\pi^+$ \vs\
$\pi^-$ events. the results are used to derive limits on the general
four-fermion couplings, the mass of the charged Higgs in the MSSM, and a
right-handed $W$ in left-right models. Many of these measurements are more
precise than the PDG world averages.


title: TAU 98 Conference Summary

abstract:
  I very briefly review the highlights of the fifth workshop on the physics of
the tau lepton and its neutrino. There has been much progress in many
sub-fields, which I touch upon in this review: the couplings of the tau to the
$Z^0$ and $W^\pm$; the leptonic branching fractions, lifetime, and tests of
universality; the Lorentz structure of tau decays; searches for neutrinoless
decays; limits on weak and electromagnetic dipole moments and CP violation;
inclusive semi-hadronic decays, spectral functions, sum rules, QCD, and
applications; substructure in tau decays to three pseudoscalars; tau decays to
kaons; limits on the mass of the tau neutrino; tau neutrinos from solar,
atmospheric, and AGN sources; accelerator searches for neutrino oscillations;
and prospects for the future.


title: New limits on dark--matter WIMPs from the Heidelberg--Moscow experiment

abstract:
  New results after 0.69 kg yr of measurement with an enriched 76Ge detector of
the Heidelberg--Moscow experiment with an active mass of 2.758 kg are
presented. An energy threshold of 9 keV and a background level of 0.042
counts/(kg d keV) in the energy region between 15 keV and 40 keV was
reached.The derived limits on the WIMP--nucleon cross section are the most
stringent limits on spin--independent interactions obtained to date by using
essentially raw data without background subtraction.


title: Search for SUSY with R-parity violation at LEP

abstract:
  Searches for supersymmetry at LEP allowing for R-parity violation are
reviewed. The results are compared with the R-parity conserving scenarios.


title: b Physics

abstract:
  A summary of the most recent and important measurements in b physics is
presented. The production of beauty particles in Z decays, b quark couplings,
lifetimes, B0-B0bar oscillations, semileptonic b decays and studies of the
number of charm quarks produced in b decays are reviewed. Extraction of the
Cabibbo-Kobayashi-Maskawa (CKM) matrix elements |V_{td}|, |V_{cb}|, |V_{ub}|
and implication for |V_{ts}| are discussed.


title: Summary on tau Leptonic Branching Ratios and Universality

abstract:
  The large samples of tau decays available from CLEO and the four LEP
experiment have resulted in new, precise measurements of the leptonic branching
ratios of the $\tau$. The experimental techniques to obtain these results are
reviewed with special emphasis on the DELPHI measurement. World averages are
found to be Be = (17.81 +/- 0.06) % and Bmu = (17.36 +/- 0.06) %. These results
are consistent with universality in the charged current couplings to a
precision of about 0.25 %. The branching ratio measurements can also be used to
constrain the "low energy parameter" eta. It is shown that the sensitivity to
eta depends on details of the momentum acceptance for muon identification in
the different experiments. Assuming universality in the couplings, the estimate
eta = 0.012 +/- 0.024 is obtained.


title:
Negatively Charged Strangelet Search using the E864 Spectrometer at the
  AGS

abstract:
  We provide a status report on the progress of searching for negatively
charged strangelets using the E864 spectrometer at the AGS. About 200 million
recorded events representing approximately 14 billion 10% central interactions
of Au + Pt at 11.5 GeV/c taken during the 1996-1997 run of the experiment are
used in the analysis. No strangelet candidates are seen for charges Z=-1 and
Z=-2, corresponding to a 90% confidence level for upper limits of strangelet
production of ~1 x 10^{-8} and ~4 x 10^{-9} per central collision respectively.
The limits are nearly uniform over a wide range of masses and are valid only
for strangelets which are stable or have lifetimes greater than ~50 ns.


title:
Multidimensional Binning Techniques for a Two Parameter Trilinear Gauge
  Coupling Estimation at LEP II

abstract:
  This paper describes two generalization schemes of the Optimal Variables
technique in estimating simultaneously two Trilinear Gauge Couplings. The first
is an iterative procedure to perform a 2-dimensional fit using the linear terms
of the expansion of the probability density function with respect to the
corresponding couplings, whilst the second is a clustering method of
probability distribution representation in five dimensions. The pair production
of W's at 183 GeV center of mass energy, where one W decays leptonically and
the other hadronically, was used to demonstrate the optimal properties of the
proposed estimation techniques.


title:
Extended Modified Observable Technique for a Multi-Parametric Trilinear
  Gauge Coupling Estimation at LEP II

abstract:
  This paper describes the extension of the Modified Observables technique in
estimating simultaneously more than one Trilinear Gauge Couplings. The optimal
properties, unbiasedness and consistent error estimation of this method are
demonstrated by Monte Carlo experimentation using $\ell \nu jj $ four-fermion
final state topologies. Emphasis is given in the determination of the expected
sensitivities in estimating the $\lambda_{\gamma} - \Delta g_{1}^{z}$ and
$\Delta k_{\gamma} - \Delta g_{1}^{z}$ pair of couplings with data from the 183
GeV LEPII run.


title: B/Bbar flavour tagging and doubly charmed B decays in ALEPH

abstract:
  This contribution concerns three contributed papers that share the common
feature of analysing fully- (or almost fully-) reconstructed B decays coming
from a sample of four million hadronic Z decays collected with the ALEPH
detector at LEP...


title: Measurements of alpha_s from hadronic event shapes in e+e- annihilation

abstract:
  New studies of hadronic event shape observables in e+ e- collisions between
13 and 183 GeV CM energy have enabled the running of alpha_s to be confirmed
and the validity of non-perturbative power-law corrections to be investigated.
A more precise value of alpha_s(M_Z) with reduced theoretical errors has been
reported from fitting 18 oriented event shape distributions measured in one
experiment at the Z.


title: The $\Lambda K$ system production in the hadron interactions

abstract:
  The A-dependence is observed in $x_F$-distributions for the $\Lambda K^0$
system produced with the small transverse momentum in the neutron-nucleus
interactions. For the $\Lambda$ hyperons similar dependence isn't seen. The
result is interpreted as an effect from intermediate excitative nucleon state,
which decays into strange particles. Such interpretation is confirmed
experimental data on $\Lambda K$ pair production in the pion-nucleon
interactions.


title: The ICARUS 50 l LAr TPC in the CERN Nu Beam

abstract:
  The 50 liter liquid Argon TPC is a detector built and successfully operated
at CERN for R&D purposes within the ICARUS programme. In the year 1997 it has
been exposed at the CERN neutrino beam for the entire SPS neutrino run period
as proposed and approved at the SPSLC of January 1997. The detector,
complemented with scintillators acting as veto, trigger counters and pre-shower
counters, was installed in front of the NOMAD detector. The year 1997 was
scheduled to be the last for the operation of the West Area Neutrino Facility.
It was important to take this last opportunity for a parasitic exposure, which
did not interfere with running experiments, of an already existing and
operating liquid Argon TPC. As we had expected, the collected data brought
important information for a better understanding of the performance of liquid
Argon TPC's which should be useful for the entire ICARUS program.


title:
Search for Glueballs from Three-body Annihilation of Antiproton-Proton
  in-Flight

abstract:
  Lattice QCD and other theoretical models predict that the 0(-+), 2(++) and
2(-+) glueballs have masses in the range of 2.0 to 2.4 GeV. For resonances in
such an energy range, three-body decay modes are expected to be large. The
strategy for looking for these glueballs and the newest results from studying
Crystal Barrel data on the three-body annihilation of proton-antiproton in
flight are presented.


title: Measurements of A_LR and A_lepton from SLD

abstract:
  This paper presents measurements of the leptonic asymmetries in Z0 decays
measured with the SLD detector. Using a data sample of approximately 500,000 Z0
bosons, we report preliminary values for A_e, A_mu and A_tau using both
hadronic and leptonic decays.


title:
Constraints on neutrino oscillation parameters from the measurement of
  day-night solar neutrino fluxes at Super-Kamiokande

abstract:
  A search for day-night variations in the solar neutrino flux resulting from
neutrino oscillations has been carried out using the 504 day sample of solar
neutrino data obtained at Super-Kamiokande. The absence of a significant
day-night variation has set an absolute flux independent exclusion region in
the two neutrino oscillation parameter space.


title:
Measurement of the High-Mass Drell-Yan Cross Section and Limits on
  Quark-Electron Compositeness Scales

abstract:
  We present a measurement of the Drell-Yan cross section at high dielectron
invariant mass using 120/pb of data collected in pbar-p collisions at sqrt(s) =
1.8 TeV by the D0 collaboration during 1992-96. No deviation from standard
model expectations is observed. We use the data to set limits on the energy
scale of quark-electron compositeness with common constituents. The 95%
confidence level lower limits on the compositeness scale vary between
  3.3 TeV and 6.1 TeV depending on the assumed form of the effective contact
interaction.


title:
Measurement of the solar neutrino energy spectrum using
  neutrino-electron scattering

abstract:
  A measurement of the energy spectrum of recoil electrons from solar neutrino
scattering in the Super--Kamiokande detector is presented. The results shown
here are obtained from 504 days of data taken between the 31st of May, 1996 and
the 25th of March, 1998. The shape of the measured spectrum is compared with
the expectation for solar B8 neutrinos. The comparison takes into account both
kinematic and detector related effects in the measurement process. The spectral
shape comparison between the observation and the expectation gives a chi-square
of 25.3 with 15 degrees of freedom, corresponding to a 4.6% confidence level.


title: Photon Structure

abstract:
  Large pT processes at HERA, initiated by almost real and by virtual photons,
provide information on the structure of the photon. We report on the latest
measurements of dijets and large pT particle production with the H1 detector.
This includes a leading order determination of an effective virtual photon
parton density, of the gluon density of the photon, and comparisons with
models.


title: Measurement of the form-factor ratios for D_s^+ -> phi ell^+ nu_ell

abstract:
  We have measured the form factor ratios r_V = V(0)/A_1(0) and r_2 =
A_2(0)/A_1(0) for the decay D_s^+ -> phi ell^+ nu_ell, phi -> K^+ K^-, using
data from charm hadroproduction experiment E791 at Fermilab. Results are based
on 144 signal and 22 background events in the electron channel and 127 signal
and 34 background events in the muon channel. We combine the measurements from
both lepton channels to obtain r_V = 2.27 +- 0.35 +- 0.22 and r_2 = 1.57 +-
0.25 +- 0.19.


title:
Measurement of the flux and zenith-angle distribution of upward
  through-going muons by Super-Kamiokande

abstract:
  A total of 614 upward through-going muons of minimum energy 1.6 GeV are
observed by Super-Kamiokande during 537 detector live days. The measured muon
flux is 1.74+/-0.07(stat.)+/-0.02(sys.)x10^{-13}cm^{-2}s^{-1}sr^{-1} compared
to an expected flux of 1.97+/-0.44(theo.)x10^{-13}cm^{-2}s^{-1}sr^{-1}. The
absolute measured flux is in agreement with the prediction within the errors.
However, the zenith angle dependence of the observed upward through-going muon
flux does not agree with no-oscillation predictions. The observed distortion in
shape is consistent with the \nu_\mu <-> \nu_\tau oscillation hypothesis with
\sin^22\theta > 0.4 and 1x10^{-3} < \Delta m^2 < 1x10^{-1} eV^{2} at 90%
confidence level.


title: The OPERA Experiment

abstract:
  OPERA(Oscillation Project with Emulsion-tRacking Apparatus) is a new detector
concept, iron(lead)-emulsion for a long-baseline neutrino oscillation
experiment. This experiment would perform an appearance search for nu_mu-nu_tau
oscillation in the parameter region indicated by the atmospheric neutrino
anomaly. OPERA can run at the Gran Sasso Laboratory in the proposed NGS
(Neutrino to Gran Sasso) Beam from CERN.


title: Study of the Hadronic Decays of \chi_c States

abstract:
  Hadronic decays of the P-wave spin-triplet charmonium states \chi_cJ
(J=0,1,2) are studied using a sample of \psi(2S) decays collected by the BES
detector operating at the BEPC storage ring. Branching fractions for the decays
\chi_c1 going to K_s^0 K^+ \pi^- + c.c., \chi_c0 going to K_s^0 K_s^0, \chi_c2
going to K_s^0 K_s^0, \chi_c0 going to \phi \phi, \chi_c2 going to \phi \phi
and \chi_cJ going to K^+ K^- K^+ K^- are measured for the first time, and those
for \chi_cJ going to \pi^+ \pi^- \pi^+ \pi^-, $ \chi_cJ going to \pi^+ \pi^-
K^+ K^-, \chi_cJ going to \pi^+ \pi^- p \bar{p} and \chi_cJ going to 3(\pi^+
\pi^-) are measured with improved precision. In addition, we determine the
masses of the \chi_c0 and \eta_c to be M_{\chi_{c0}}=3414.1 \pm 0.6(stat) \pm
0.8 (sys) MeV and M_{\eta_c}=2975.8 \pm 3.9(stat) \pm 1.2 (sys) MeV.


title: A Measurement of the tau->electron Branching Ratio

abstract:
  The branching ratio for the decay tau->e nue nutau has been measured using Z0
decay data collected by the OPAL experiment at LEP. In total 33073 tau->e nue
nutau candidates were identified from a sample of 186197 selected tau decays,
giving a branching ratio of 17.81 +- 0.09(stat) +_ 0.06(sys)%. This result is
combined with other measurements to test e-mu and mu-tau universality in
charged-current weak interactions. Additionally, the strong coupling constant
alpha_s has been extracted and evolved to the Z0 mass scale, giving alpha_s =
0.1204 +- 0.0011(exp) +- 0.0019(theory).


title:
A Measurement of the Product Branching Ratio
  f(b->Lambda_b).BR(Lambda_b->Lambda X) in Z0 Decays

abstract:
  The product branching ratio, f(b->Lambda_b).BR(Lambda_b->Lambda X), where
Lambda_b denotes any weakly-decaying b-baryon, has been measured using the OPAL
detector at LEP. Lambda_b are selected by the presence of energetic Lambda
particles in bottom events tagged by the presence of displaced secondary
vertices. A fit to the momenta of the Lambda particles separates signal from B
meson and fragmentation backgrounds. The measured product branching ratio is
f(b->Lambda_b).BR(Lambda_b->Lambda X) = (2.67+-0.38(stat)+0.67-0.60(sys))%
Combined with a previous OPAL measurement, one obtains
f(b->Lambda_b).BR(Lambda_b->Lambda X) = (3.50+-0.32(stat)+-0.35(sys))%.


title: Hyperon Physics Results from SELEX

abstract:
  In parallel to charm hadroproduction the experiment SELEX (E781) at Fermilab
is pursuing a rich hyperon physics program. SELEX employs a 600 GeV/c beam
consisting of 50% \Sigma^- and \pi^- each. The three-stage magnetic
spectrometer covering 0.1 <= x_F <= 1.0 features a high-precision silicon
vertex system, broad-coverage particle identification using TRD and RICH, and a
three-stage lead glass photon calorimeter. First results for the \Sigma^-
charge radius, total (\Sigma^-)-nucleon cross sections, and a new upper limit
for the radiative width of the \Sigma^-*(1385) are presented.


title:
Limits on dark matter WIMPs using upward-going muons in the MACRO
  detector

abstract:
  We perform an indirect search for Weakly Interacting Massive Particles
(WIMPs) using the MACRO detector to look for neutrino-induced upward-going
muons resulting from the annihilation of WIMPs trapped in the Sun and Earth.
The search is conducted in various angular cones centered on the Sun and Earth
to accommodate a range of WIMP masses. No significant excess over the
background from atmospheric neutrinos is seen and limits are placed on the
upward-going muon fluxes from Sun and Earth. These limits are used to constrain
neutralino particle parameters from supersymmetric theory, including those
suggested by recent results from DAMA/NaI.


title: The Strong Coupling: Measurements and Running

abstract:
  Measurements of \alpha_s from event shapes in e^{+} e^{-} annihilation are
discussed including recent determinations using experimentally optimized
scales, studies of theoretically motivated scale setting prescriptions, and
recently observed problems with predictions in Next to Leading Logarithmic
Approximation. Other recent precision measurements of \alpha_s are briefly
discussed. The relevance of power terms for the energy evolution of event shape
means and distributions is demonstrated. Finally a summary on the current
results on \alpha_s(M_Z) and its running is given.


title:
A study of the centrally produced baryon-antibaryon systems in pp
  interactions at 450 GeV/c

abstract:
  A study of the centrally produced ppbar, ppbarpi, ppbarpipi and lambda lambda
channels has been performed in pp collisions using an incident beam momentum of
450 GeV/c. No significant new structures are observed in the mass spectra,
however, important new information on the production dynamics is obtained. A
systematic study of the production properties of these systems has been
performed and it is found that these systems are not produced dominantly by
double Pomeron exchange.


title:
Measurement of D* Meson Cross Sections at HERA and Determination of the
  Gluon Density in the Proton using NLO QCD

abstract:
  With the H1 detector at the ep collider HERA, D* meson production cross
sections have been measured in deep inelastic scattering with four-momentum
transfers Q^2>2 GeV2 and in photoproduction at energies around W(gamma p)~ 88
GeV and 194 GeV. Next-to-Leading Order QCD calculations are found to describe
the differential cross sections within theoretical and experimental
uncertainties. Using these calculations, the NLO gluon momentum distribution in
the proton, x_g g(x_g), has been extracted in the momentum fraction range
7.5x10^{-4}< x_g <4x10^{-2} at average scales mu^2 =25 to 50 GeV2. The gluon
momentum fraction x_g has been obtained from the measured kinematics of the
scattered electron and the D* meson in the final state. The results compare
well with the gluon distribution obtained from the analysis of scaling
violations of the proton structure function F_2.


title:
Measurement of Dijet Cross-Sections at Low Q^2 and the Extraction of an
  Effective Parton Density for the Virtual Photon

abstract:
  The triple-differential dijet cross-section, d^3 sigma_{ep}/dQ2 dE_t2
dxgjets, is measured with the H1 detector at HERA as a function of the photon
virtuality Q^2, the fraction of the photon's momentum carried by the parton
entering the hard scattering, xgjets, and the square of the mean transverse
energy, E_t2, of the two highest E_t jets. Jets are found using a longitudinal
boost-invariant k_T clustering algorithm in the gamma* p center of mass frame.
The measurements cover the ranges 1.6 < Q^2 < 80 GeV$^2 in virtuality and 0.1 <
y < 0.7 in inelasticity y. The results are well described by leading order QCD
models which include the effects of a resolved component to the virtual photon.
Models which treat the photon as point-like fail to describe the data. An
effective leading order parton density for the virtual photon is extracted as a
function of the photon virtuality, the probing scale and the parton momentum
fraction. The x_gamma and probing scale dependences of the parton density show
characteristic features of photon structure, and a suppression of this
structure with increasing Q^2 is seen.


title: New Experimental Results on Strangeness Production

abstract:
  New experimental results on the production of $\phi$ and $f_2'(1525)$ mesons
in the annihilation of stopped antiprotons are discussed. The explanation of
these facts in the framework of the polarized strangeness model is considered.


title: Jet Physics at LEP and World Summary of $\alpha_s$

abstract:
  Recent results on jet physics and tests of QCD from hadronic final states in
$e^+e^-$ annihilation at PETRA and at LEP are reviewed, with special emphasis
on hadronic event shapes, charged particle production rates, properties of
quark and gluon jets and determinations of $\alpha_s$. The data in the entire
energy range from PETRA to LEP-2 are in broad agreement with the QCD
predictions. The world summary of measurements of $\alpha_s$ is updated and a
detailed discussion of various methods to determine the overall error of
$\alpha_s (M_Z)$ is presented. The new world average is $\alpha_s (M_Z) = 0.119
\pm 0.004$. The size of the error depends on the treatment of correlated
uncertainties.


title:
On recent data of branching ratios for psi(2S)-->J/psi pi pi and
  psi(2S)-->J/psi eta

abstract:
  Recent data on branching ratios for \psi(2S) decays to J/\psi\pi^+\pi^-,
J/\psi\pi^0\pi^0 and J/\psi\eta are reviewed. An alternative treatment of data
is proposed to get rid of the logical inconsistency which occurs in original
computational procedure.


title: Transition radiation as a source of quasi-monochromatic X-rays

abstract:
  Transition radiation (TR) from ultrarelativistic particles is considered. It
is shown that performing collimation of the TR from the periodic N-foil stack
(parameters of which are selected in a appropriate manner) one obtains the
spectrum of the TR which has a form of a peak position of which $\omega_1$
depends on the plasma frequency and the thickness of the radiator foils. The
height and width of the peak depend on the collimation angle $\vartheta_c$. The
height of the peak for given $\vartheta_c$ is proportional to N. Selecting
parameters one can have the source of X-rays of desired frequency with rather
good monochromaticity.


title: Structure Functions

abstract:
  The latest structure function results, as presented at the ICHEP98
conference, are reviewed. A brief introduction to the formalism and the status
of global analyses of parton distributions is given. The review focuses on
three experimental areas: fixed-target results and their constraints on the
parton densities at high $x$; spin structure and spin parton densities as well
as the status of the associated sum rules; HERA results on the dynamics of
$F_2$ at low $(x,Q^2)$, charm and $F_L$ as well as the measurement and
interpretation of the high-$Q^2$ neutral and charged current cross-sections.


title: Diffraction and Low-Q^2 Physics Including Two-Photon Physics

abstract:
  Recent experimental results on the partonic structure of the photon and on
the color singlet exchange in strong interaction processes are reviewed. At the
LEP electron-positron and HERA lepton-proton colliders, complementary and
consistent measurements have been achieved on the quark-gluon structure of
quasi-real and virtual photons. At the HERA lepton-proton and Tevatron
proton-antiproton colliders, the quark-gluon configuration of the diffractive
exchange is consistently found to have a large gluon component. The rate of
diffractive interactions observed by the HERA and Tevatron experiments,
however, is largely different and challenges explanation (invited plenary talk
at the XXIX International Conference on High Energy Physics, Vancouver, B.C.
Canada (1998)).


title: First Charm Hadroproduction Results from SELEX

abstract:
  The SELEX experiment (E781) at Fermilab is a 3-stage magnetic spectrometer
for the high statistics study of charm hadroproduction out to large x_F using
600 GeV Sigma^-, p and pi beams. The main features of the spectrometer are:
high precision silicon vertex system, broad-coverage particle identification
with TRD and RICH, 3-stage lead glass photon detector. Preliminary results on
differences in hadroproduction characteristics of charm mesons and Lambda_c^+
for x_F>0.3 are reported. For baryon beams there is a striking asymmetry in the
production of baryons compared to antibaryons. Leading particle effects for all
incident hadrons are discussed.


title:
Stable Algorithm for Extraction of Asymmetries from the Data on
  Polarized Lepton-Nucleon Scattering

abstract:
  A new algorithm for extraction of asymmetries from polarized lepton-nucleon
scattering data is proposed. The algorithm is stable to set-up acceptance
and/or luminosity monitor acceptance variations. A statistical test for
checking the data quality is proposed.


title: Physics Results from RICH Detectors

abstract:
  RICH detectors have become extraordinarily useful. Results include
measurement of solar neutrino rates, evidence for neutrino oscillations,
measurement of TeV gamma-rays from gravitational sources, properties of QCD,
charm production and decay, and measurement of the CKM matrix elements Vcs, Vcb
and Vub. A new value |Vub/Vcb|=0.087+/-0.012 is determined.


title:
Evaluation of the LEP Centre-of-Mass Energy Above the W-Pair Production
  Threshold

abstract:
  Knowledge of the centre-of-mass energy at LEP2 is of primary importance to
set the absolute energy scale for the measurement of the W-boson mass. The beam
energy above 80 GeV is derived from continuous measurements of the magnetic
bending field by 16 NMR probes situated in a number of the LEP dipoles. The
relationship between the fields measured by the probes and the beam energy is
calibrated against precise measurements of the average beam energy between 41
and 55 GeV made using the resonant depolarisation technique. The linearity of
the relationship is tested by comparing the fields measured by the probes with
the total bending field measured by a flux loop. This test results in the
largest contribution to the systematic uncertainty. Several further corrections
are applied to derive the the centre-of-mass energies at each interaction
point. In addition the centre-of-mass energy spread is evaluated. The beam
energy has been determined with a precision of 25 MeV for the data taken in
1997, corresponding to a relative precision of 2.7x10^{-4}. This is small in
comparison to the present uncertainty on the W mass measurement at LEP.
However, the ultimate statistical precision on the W mass with the full LEP2
data sample should be around 25 MeV, and a smaller uncertainty on the beam
energy is desirable. Prospects for improvements are outlined.


title: Results on the nucleon spin structure

abstract:
  SMC performed an investigation of the spin structure of the nucleon by
measuring deep inelastic scattering of polarised muons off polarised protons
and deuterons. A summary of the results for spin structure functions and sum
rules is given.


title: SUSY discovery strategies at the LHC

abstract:
  Current ideas for SUPERSYMMETRY searches at the LHC are reviewed. We analyse
the discovery prospects for various supersymmetric particles and describe
recent ideas on the possibilities of detailed SUSY studies at the LHC. We also
combine today's experimental knowledge with some speculations about what might
be known by the year 2005 to provide a realistic picture for the LHC start.


title: Measurements of $B \to X_s \gamma$ and Study of $B \to X_s l^+ l^-$

abstract:
  The updated CLEO measurement of the electromagnetic penguin process $B \to
X_s \gamma$ is presented and compared to the ALEPH result. Implications on new
physics are discussed and the status of recent searches for $B \to X_s l^+ l^-$
modes is given.


title:
Measurement of the Proton and Deuteron Spin Structure Functions g2 and
  Asymmetry A2

abstract:
  We have measured the spin structure functions g2p and g2d and the virtual
photon asymmetries A2p and A2d over the kinematic range 0.02 < x < 0.8 and 1.0
< Q^2 < 30(GeV/c)^2 by scattering 38.8 GeV longitudinally polarized electrons
from transversely polarized NH3 and 6LiD targets.The absolute value of A2 is
significantly smaller than the sqrt{R} positivity limit over the measured
range, while g2 is consistent with the twist-2 Wandzura-Wilczek calculation. We
obtain results for the twist-3 reduced matrix elements d2p, d2d and d2n. The
Burkhardt-Cottingham sum rule integral - int(g2(x)dx) is reported for the range
0.02 < x < 0.8.


title: Review of b-flavored Hadron Spectroscopy

abstract: The current status of b-flavored hadron spectroscopy is reviewed.


title: Hadronic Decays of Beauty and Charm from CLEO

abstract:
  A selection of recent results on hadronic charm and beauty decays from the
CLEO experiment are presented. We report preliminary evidence for the existence
of final state interactions in B decays and the first observation of the decay
B0 -> D*+D*- with a branching fraction of (6.2^{+4.0}_{-2.9}+/- 1.0)x10^{-4}.
We also present preliminary results on the first observation of the broad,
J^P=1^+, charmed meson resonance with a mass of
2.461^{+0.041}_{-0.034}+/-0.010+/-0.032 GeV and a width of
290^{+101}_{-79}+/-26+/-36 MeV and branching fraction measurements of the B- ->
D_J^0pi- decays. Finally, we report on search for the radial excitation of a
spin 1 charmed meson, the D*'+, and on an improved measurement of the ratio of
(D0 -> K+pi-)/(D0 -> K-pi^+) decay rates.


title:
Searching for the Higgs and other Exotic Objects; A ``How to'' Guide
  from LEP to the LHC

abstract:
  Methods and ideas to search for new phenomena at existing and future collider
facilities like LEPII and the LHC are analysed. Emphasis is put on the
experimental aspects of discovery strategies for the Higgs Boson of the
Standard Model. This is followed by a critical analysis of search methods for
the extended Higgs sector and the direct detection of Supersymmetric Particles
within the Minimal Supersymmetric Standard Model. We also discuss methods and
the potential mass reach of the LHC experiments to discover new Bosons and
Fermions.


title:
Measurement of Internal Jet Structure in Dijet Production in
  Deep-Inelastic Scattering at HERA

abstract:
  Internal jet structure in dijet production in deep-inelastic scattering is
measured with the H1 detector at HERA. Jets with transverse energies ET,Breit >
5 GeV are selected in the Breit frame employing k_perp and cone jet algorithms.
In the kinematic region of squared momentum transfers 10 < Q2 <~ 120 GeV2 and
x-Bjorken values 2.10^-4 <~ xBj <~ 8.10^-3, jet shapes and subjet
multiplicities are measured as a function of a resolution parameter.
Distributions of both observables are corrected for detector effects and
presented as functions of the transverse jet energy and jet pseudo-rapidity.
Dependences of the jet shape and the average number of subjets on the
transverse energy and the pseudo-rapidity of the jet are observed. With
increasing transverse jet energies and decreasing pseudo-rapidities,
i.e.towards the photon hemisphere, the jets are more collimated. QCD models
give a fair description of the data.


title: Search for Baryon and Lepton Number Violating Z0 Decays

abstract:
  Using data collected with the OPAL detector at LEP, we have searched for the
processes e+e- -> Z0 -> p e-, p mu- and the charge conjugate final-states.
These would violate the conservation of the baryon-number B, lepton-number L
and the fermion-number n = (B+L). No evidence for such decays has been found,
and the 95% confidence level upper limits on the partial widths Z0 -> p e and
Z0 -> p mu are found to be 4.6 and 4.4 keV respectively.


title:
Test of non-standard neutrino properties with the BOREXINO source
  experiments

abstract:
  We calculate the event rates induced by high-intensity radioactive sources of
nu_e (51Cr) and of anti-nu_e (90Sr), to be located near the BOREXINO detector.
Calculations are performed both in the standard case and assuming non-standard
properties of neutrinos, including flavor oscillations, neutrino
electromagnetic interactions, and deviations from the standard vector and axial
couplings in the nu_e-e interaction. It is shown that, in some cases, the
current limits on non-standard neutrino properties can be significantly
improved.


title: The NA48 Liquid Krypton Calorimeter Description and Performances

abstract:
  The NA48 experiment at CERN aims at making a precision study of direct CP
violation in the neutral kaons, by measuring $Re(\epsilon'/\epsilon)$ with an
accuracy better than 0.02%. To achieve this goal, the experiment requires a
neutral detector with fast response, high efficiency in a high-rate environment
(\sim MHz), long-term stability, sub-nanosecond time resolution, millimetric
space precision, and an excellent energy resolution (1%) in the $5 \to 100$ GeV
range. To achieve these performances, a quasi-homogeneous Liquid Krypton
calorimeter has been chosen, designed with a projective tower geometry, high
transversal segmentation, and fast digital readout. The calorimeter was
operative during the '97 data taking period, its performances were thoroughly
studied, and found to be in agreement with design requirements. A detector
description and performances analysis are here presented.


title: Radiative Width of the a2 Meson

abstract:
  We present data on coherent production of the pi-pi-pi+ system by 600 GeV
pion beam for the C, Cu and Pb targets. The Primakoff formalism was used for
extracting the radiatve width of the a2 meson. We obtain a preliminary value
\Gamma(a2->pi+gamma)=225+/-25(stat)+/-45(syst) keV.


title:
Treatment of the background error in the statistical analysis of Poisson
  processes

abstract:
  The formalism that allows to take into account the error sigma_b of the
expected mean background b in the statistical analysis of a Poisson process
with the frequentistic method is presented. It is shown that the error sigma_b
cannot be neglected if it is not much smaller than sqrt(b). The resulting
confidence belt is larger that the one for sigma_b=0, leading to larger
confidence intervals for the mean mu of signal events.


title: Centrality of collisions and total disintegration of nuclei

abstract:
  The interrelation of the processes of total disintegration of nuclei with the
processes, characterized by the "centrality" of collisions and a minimum flow
of energy of secondary particles emitted at a zero angle in pC, dC, 4HeC and
12CC interactions, is investigated at 4.2 A GeV/c . The events with total
disintegration of nuclei are characterized by a high degree "centrality" of
collisions and similar to the events having a minimum flow of energy of
particles emitted at a zero angle.


title:
Measurement of the B+ and B0 Lifetimes and Search for CP(T) Violation
  using Reconstructed Secondary Vertices

abstract:
  The lifetimes of the B+ and B0 mesons, and their ratio, have been measured in
the OPAL experiment using 2.4 million hadronic Z0 decays recorded at LEP. Z0 ->
b bbar decays were tagged using displaced secondary vertices and high momentum
electrons and muons. The lifetimes were then measured using well-reconstructed
charged and neutral secondary vertices selected in this tagged data sample. The
results are tau(B+) = 1.643 +- 0.037 +- 0.025 ps tau(B0) = 1.523 +- 0.057 +-
0.053 ps ratio tau(B+)/tau(B0) = 1.079 +- 0.064 +- 0.041 where in each case the
first error is statistical and the second systematic.
  A larger data sample of 3.1 million hadronic Z0 decays has been used to
search for CP and CPT violating effects by comparison of inclusive b and bbar
hadron decays. No evidence for such effects is seen. The CP violation parameter
Re(epsilon_B) is measured to be Re(epsilon_B) = 0.001 +- 0.014 +- 0.003 and the
fractional difference between b and bbar hadron lifetimes is measured to be
-0.001 +- 0.012 +- 0.008


title: Experimental Challenges at the LHC

abstract:
  The Large Hadron Collider (LHC) at CERN will provide proton-proton collisions
at a centre-of-mass energy of 14 TeV with a design luminosity of
10**34/cm**2/s. The exploitation of the rich physics potential offered by the
LHC will be illustrated using the expected performance of the two
general--purpose detectors ATLAS and CMS. The detector design requirements
necessary to extract the physics under the challenging experimental conditions
at the LHC are discussed. This is followed by an analysis of search methods for
the Higgs sector and the detection of supersymmetric particles.


title: Colour reconnection studies in e+e- -> W+W- at sqrt(s)=183 GeV

abstract:
  The predicted effects of final state interactions such as colour reconnection
are investigated by measuring properties of hadronic decays of W bosons,
recorded at a centre-of-mass energy of sqrt(s)=182.7 GeV in the OPAL detector
at LEP. Dependence on the modelling of hadronic W decays is avoided by
comparing W+W- -> qqqq events with the non-leptonic component of W+W- -> qqlnu
events.
  The scaled momentum distribution, its mean value, x_p, and that of the
charged particle multiplicity, n_ch, are measured and found to be consistent in
the two channels. The measured differences are:
  Diff(x_p) = +0.7 +- 0.8 +- 0.6 and
  Diff(n_ch) = (-0.09 +- 0.09 +-0.05)*10**-2.
  In addition, measurements of rapidity and thrust are performed for W+W- ->
qqqq events. The data are described well by standard QCD models and disfavour
one model of colour reconnection within the ARIADNE program. The current
implementation of the ELLIS-GEIGER model of colour reconnection is excluded. At
the current level of statistical precision no evidence for colour reconnection
effects was found in the observables studied. The predicted effect of colour
reconnection on OPAL measurements of M_W is also quantified in the context of
models studied.


title: Observation of the decay PHI(1020)--->OMEGA+PI0

abstract:
  The reaction e^+e^- ---> OMEGA+PI0 ---> PI+PI- 2PI0 has been studied with SND
detector at VEPP-2M e^+e^- collider in the vicinity of the PHI(1020) meson
resonance. The observed interference pattern in the energy dependence of the
cross section is consistent with existence of the decay PHI ---> OMEGA+PI0 with
a branching ratio of B(PHI ---> OMEGA+PI0)=(4.8+1.9-1.7+-0.8)x10^{-5}. The real
and imaginary parts of the decay amplitude were measured. The PHI --->
OMEGA+PI0 decay was observed for the first time.


title:
Double Beta and Dark Matter Search - Window to New Physics beyond the
  Standard Model of Particle Physics

abstract:
  Nuclear double beta decay provides an extraordinarily broad potential to
search for beyond Standard Model physics, probing already now the TeV scale, on
which new physics should manifest itself. These possibilities are reviewed
here. First, the results of present generation experiments are presented. The
most sensitive one of them - the Heidelberg-Moscow experiment in the Gran Sasso
- probes the electron mass now in the sub eV region and will reach a limit of
$\sim$ 0.1 eV in a few years. Basing to a large extent on the theoretical work
of the Heidelberg Double Beta Group in the last two years, results are obtained
also for SUSY models (R-parity breaking, sneutrino mass), leptoquarks
(leptoquark-Higgs coupling), compositeness, right-handed W boson mass, test of
special relativity and equivalence principle in the neutrino sector and others.
One of the enriched $^{76}$Ge detectors also yields the most stringent limits
for cold dark matter (WIMPs) to date by using raw data. A new Heidelberg
experimental proposal (GENIUS) is described which would allow to increase the
sensitivity for Majorana neutrino masses from the present level of at best 0.1
eV down to 0.01 or even 0.001 eV. It would further, already in a first step
using only 100 kg of natural Ge detectors, cover almost the full MSSM parameter
space for prediction of neutralinos as cold dark matter.


title: Charmonium Decays to Axialvector plus Pseudoscalar Mesons

abstract:
  A sample of 3.79 million psi(2S) decays observed in the BES detector is used
to study the decays of charmonium to axialvector plus pseudoscalar mesons. The
branching fraction for psi(2S) to b1pi agrees with expectations. A contrasting
behavior between the psi(2S) and the J/psi decays to K1K cannot be accommodated
by an adjustment of the singlet-triplet axialvector mixing angle.


title:
Measurement of the Top Quark Pair Production Cross Section in the
  All-jets Decay Channel

abstract:
  We present a measurement of tbar-t production using multijet final states in
pbar-p collisions at a center-of-mass energy of 1.8 TeV, with an integrated
luminosity of 110.3 pb(-1). The analysis has been optimized using neural
networks to achieve the smallest expected fractional uncertainty on the tbar-t
production cross section, and yields a cross section of 7.1 +/- 2.8(stat.) +/-
1.5(syst.) pb, assuming a top quark mass of 172.1 GeV/c^(2). Combining this
result with previous D0 measurements, where one or both of the W bosons decay
leptonically, gives a tbar-t production cross section of 5.9 +/- 1.2(stat) +/-
1.1(syst) pb.


title:
The Atmospheric Neutrino Flavor Ratio from a 3.9 Fiducial Kiloton-Year
  Exposure of Soudan 2

abstract:
  We report a measurement of the atmospheric neutrino flavor ratio, R, using a
sample of quasi-elastic neutrino interactions occurring in an iron medium. The
flavor ratio (tracks/showers) of atmospheric neutrinos in a 3.9 fiducial
kiloton-year exposure of Soudan 2 is 0.64 +- 0.11 (stat.) +- 0.06 (syst.) of
that expected. Important aspects of our main analysis have been checked by
carrying out two independent, alternative analyses; one is based upon automated
scanning, the other uses a multivariate approach for background subtraction.
Similar results are found by all three approaches.


title: Measurement of the W Mass and Width in e+e- Collisions at 183 GeV

abstract:
  Using a data sample of 57 pb-1 recorded at a centre-of-mass energy of 183 GeV
with the Opal detector at LEP, 282 W+W- -> qqqq and 300 W+W- -> qqlnu candidate
events are used to obtain a measurement of the mass of the W boson, W_W = 80.39
+- 0.13(stat.) +- 0.05(syst.) GeV assuming the Standard Model relation between
M_W and Gam_W. A second fit provides a direct measure of the width of the W
boson and gives Gam_W = 1.96 +- 0.34(stat.) +- 0.20(syst.) GeV. These results
are combined with previous OPAL results to obtain M_W = 80.38 +- 0.12(stat.) +-
0.05(syst.) GeV and Gam_W = 1.84 +- 0.32(stat.) +- 0.20(syst.) GeV.


title: Diffractive Phenomena at HERA

abstract:
  Highlights selected from recent measurements of colour-singlet exchange
processes at HERA are summarised. Particular emphasis is placed on energy and
momentum transfer dependences and the decomposition of the data into an
expansion in Regge trajectories. The latest results in vector meson helicity
analysis, partonic descriptions of hard diffraction and diffractive dijet
production are also covered.


title:
High statistics measurement of the underground muon pair separation at
  Gran Sasso

abstract:
  We present a measurement of the underground decoherence function using
multi-muon events observed in the MACRO detector at Gran Sasso at an average
depth of 3800 hg/cm**2. Muon pair separations up to 70 m have been measured,
corresponding to parent mesons with P_t < 1-2GeV/c. The accuracy of the
measurement is such that the possible contribution of rare processes, such as
mu + N ----> mu + N + mu- + mu+, can be experimentally studied. The measured
decoherence function is compared with the predictions of the hadronic
interaction model of the HEMAS Monte Carlo code. Good agreement is obtained. We
interpret this agreement to indicate that no anomalous P_t components in soft
hadron-Nucleus and Nucleus-Nucleus collisions are required by the MACRO
experimental data.


title:
High-purity germanium detector ionization pulse shapes of nuclear
  recoils, gamma interactions and microphonism

abstract:
  Nuclear recoil measurements with high-purity Germanium detectors are very
promising to directly detect dark matter candidates. The main background
sources in such experiments are natural radioactivity and microphonic noise.
Digital pulse shape analysis is an encouraging approach to reduce the
background originating from the latter. To study the pulse shapes of nuclear
recoil events we performed a neutron scattering experiment, which covered the
ionization energy range from 20 to 80 keV. We have measured ionization
efficiencies as well and found an excellent agreement with the theory of
Lindhard. In a further experiment we measured pulse shapes of a radioactive
gamma-source and found no difference to nuclear recoil pulse shapes. Pulse
shapes originating from microphonics of a HPGe-detector are presented for the
first time. A microphonic noise suppression method, crucial for dark matter
direct detection experiments, can therefore be calibrated with pulse shapes
from gamma-sources.


title: Z lineshape and forward-backward asymmetries

abstract:
  Preliminary but close to final results on the Z lineshape and
Forward-Backward asymmetries from the four LEP experiments are presented.
Combined values extracted from ALEPH. DELPHI, L3 and OPAL data recorded at
energies around the Z pole are discussed.


title:
Measurement of triple gauge WWgamma couplings at LEP2 using photonic
  events

abstract:
  A study of events with photons and missing energy has been performed with the
data sample obtained with the ALEPH detector at centre-of-mass energies from
161 to 184 GeV,corresponding to a total integrated luminosity of about 80
pb**-1. The measured distributions are in agreement with Standard Model
predictions, leading to constraints on W W gamma gauge coupling parameters
Delta(kappa_gamma) and lambda_gamma. The results from the fit to the cross
sections and to the energy and angular distributions of the photons are:
  Delta(kappa_gamma) = 0.05 +1.15/-1.10 (stat) +/- 0.25 (syst)
  lambda_gamma = 0.05 +1.55/-1.45 (stat) +/- 0.30 (syst)


title: SySal: System of Salerno

abstract:
  SySal (SYstem of SALerno) is the automatic scanning system developed in the
emulsion laboratory of Salerno to take part in the emulsion scanning phase of
the CHORUS experiment at CERN. In the following chapters we will present
features, results and further developments of this automatic multi-tracking
system.


title: Physics Results from SLD Using the CRID

abstract:
  We review recent Z^0 physics results from SLD that use the Cherenkov Ring
Imaging Detector for charged particle identification. The performance of the
detector and likelihood method are described briefly. Several hadronization
measurements are presented, including identified hadron production in events of
different primary flavors, leading hadron production, and new correlation
studies sensitive to details of both leading and nonleading hadron production.
Identified K^+- have been used in conjunction with precision vertexing to study
charmless and doubly charmed B-hadron decays. This combination has also been
used to tag b, b-bar, c and c-bar jets, yielding precise measurements of
B^0-B^0bar mixing and of the asymmetric couplings A_b and A_c. Identified K^+-
and Lambda^0 have been used to tag s and s-bar jets, yielding a measurement of
A_s. The clean identified particle samples provided efficiently by the CRID
allow the purities of these tags to be measured from the data, an essential
ingredient for precision physics.


title: Heavy Flavour Physics at HERA

abstract:
  New results with increased statistics are presented for heavy flavour
production at Q2<150 Gev2 and in the photoproduction limit Q2-->0. Cross
sections for Dstar production, F2charm, the gluon density in the proton, and
inelastic J/psi production are discussed and compared to theoretical
calculations. A first measurement of the b anti-b cross section is reported.


title: Status of Salerno Laboratory (Measurements in Nuclear Emulsion)

abstract:
  A report on the analysis work in the Salerno Emulsion Laboratory is
presented. It is related to the search for nu_mu->nu_tau oscillations in CHORUS
experiment, the calibrations in the WANF (West Area Neutrino Facility) at Cern
and tests and preparation for new experiments.


title: Oscillations of neutral B mesons systems

abstract:
  The oscillation phenomenon in the neutral B mesons systems is now well
established.
  The motivations and principles of the measurements are given; then the most
recent results from the LEP experiments, the CDF collaboration at Fermilab and
the SLD collaboration at SLAC are reviewed.
  The present world average of the $\bd$ meson oscillation frequency is $\dmd =
0.471 \pm 0.016 \ps$ and the lower limit on the $\bs$ oscillation frequency is
$\dms > 12.4 \ps at 95% CL$.


title:
Measurement of the jet width in gamma-gamma collisions and in e^+e^-
  annihilation process at TRISTAN

abstract:
  The shape of jets produced in (quasi-) real photon-photon collisions as well
as in e^+e^- annihilation process has been studied with a cone jet finding
algorithm, using the data taken with the TOPAZ detector at the TRISTAN e^+e^-
collider at an average center-of-mass energy of 58 GeV. The results are
presented in terms of the jet width as a function of the jet transverse
energy(E^{jet}_T) as well as a scaled transverse jet energy,
x_T(=2E^{jet}_T/root(s)).
  The jet width narrows as E^{jet}_T increases; however, at the same value of
E^{jet}_T the jet width in gamma-gamma collisions at TRISTAN is significantly
narrower than that in gamma p collisions at HERA. By comparing our results with
the data in other reactions, it has been shown that the jet width in
gamma-gamma, gamma p, p\bar{p} collisions as well as the e^+e^- annihilation
process has an approximate scaling behavior as a function of x_T.


title: Searches for R-Parity Violating Decays of Gauginos at 183 GeV at LEP

abstract:
  Searches for pair-produced charginos and neutralinos with R-parity violating
decays have been performed using a data sample corresponding to an integrated
luminosity of 56 pb-1 collected with the OPAL detector at LEP at a
centre-of-mass energy of 183 GeV. An important consequence of R-parity
violation is that the lightest supersymmetric particle becomes unstable. The
searches have been performed under the assumptions that the lightest
supersymmetric particle promptly decays and that only one R-parity violating
coupling is dominant for each of the decay modes considered. Such processes
would yield multiple leptons, leptons plus jets, or multiple jets with or
without significant missing energy in the final state. No excess of such events
above Standard Model backgrounds has been observed. Limits are presented on the
production cross-sections of gauginos in R-parity violating scenarios. Limits
are also presented in the framework of the Minimal Supersymmetric Standard
Model.


title:
CASTOR: The ALICE forward detector for identification of Centauros and
  Strangelets in Nucleus-Nucleus Collisions at the LHC

abstract:
  The physics motivation for a very forward detector for the ALICE heavy ion
experiment at the CERN LHC is discussed. A phenomenological model describing
the formation and decay of a Centauro fireball in nucleus-nucleus collisions is
presented. The CASTOR detector which is aimed to measure the hadronic and
photonic content of an interaction and to identify deeply penetrating objects
in the very forward, baryon-rich phase space 5.6 < eta < 7.2 in an
event-by-event mode is described. Results of simulations of the expected
response of the calorimeter, and in particular to the passage of strangelets,
are presented.


title: Precision Studies at a Future Linear Collider

abstract:
  A future linear collider will complement the programme of the Large Hadron
Collider, especially for precision physics. The RADCOR community has an
important part to play in refining the predictions for rates and processes in
Electroweak, Higgs, SUSY, top and QCD physics, for e^+ e^-, e^- e^-, $\gamma
\gamma$ and $\gamma e$ collisions.


title: Measurement of W and Z boson production cross sections

abstract:
  DO has measured the inclusive production cross section of W and Z bosons in a
sample of 13 pb$^{-1}$ of data collected at the Fermilab Tevatron. The cross
sections, multiplied by their leptonic branching fractions, for production in
pbar-p collisions at sqrt{s}=1.8 TeV are sigma_W*B(W->e nu) =
2.36+-0.02+-0.08+-0.13 nb, sigma_W*B(W->mu nu) = 2.09+-0.06+-0.22+-0.11 nb,
sigma_Z*B(Z->e+ e-) = 0.218+-0.008+-0.008+-0.012 nb, and sigma_Z*B(Z->mu+ mu-)
= 0.178+-0.022+-0.021+-0.009 nb, where the first uncertainty is statistical and
the second systematic; the third reflects the uncertainty in the integrated
luminosity. For the combined electron and muon analyses, we find sigma_W*B(W->l
mu)/sigma_Z*B(Z->l+ l-) = 10.90+-0.52. Assuming standard model couplings, we
use this result to determine the width of the W boson, and obtain Gamma(W) =
2.044+-0.097 GeV.


title:
Momentum Spectra in the Current Region of the Breit Frame in Deep
  Inelastic Scattering at HERA

abstract:
  The production of charged particles has been measured in deep inelastic
scattering (DIS) with the ZEUS detector. The evolution of the moments of the
scaled momenta distributions in $Q^2$ and $x$ has been investigated in the
current fragmentation region of the Breit frame. The results in the current
region are compared to $e^+e^-$ data and QCD analytical calculations. The
results are consistent with the universality of single-particle spectra in DIS
and $e^+e^-$ annihilation at high $Q^2.$ The results at low $Q^2$ disagree with
analytical calculations based on the modified leading log approximation (MLLA)
and local parton hadron duality (LPHD).


title:
Measurement of the Associated $\gamma + \mu^\pm$ Production Cross
  Section in $p \bar p$ Collisions at $\sqrt{s} = 1.8$ TeV

abstract:
  We present the first measurement of associated direct photon + muon
production in hadronic collisions, from a sample of 1.8 TeV $p \bar p$
collisions recorded with the Collider Detector at Fermilab. Quantum
chromodynamics (QCD) predicts that these events are primarily from the Compton
scattering process $cg \to c\gamma$, with the final state charm quark producing
a muon. Hence this measurement is sensitive to the charm quark content of the
proton. The measured cross section of $29\pm 9 pb^{-1}$ is compared to a
leading-order QCD parton shower model as well as a next-to-leading-order QCD
calculation.


title: Parametric X-radiation for Bragg geomery

abstract:
  The PXR spectral-angular and angular distributions in Si and LiH crystals for
Bragg geometry are presented. PXR for both the forward and backward diffraction
is studied. It is shown that for Bragg geometry the contributions of both the
slow and the fast waves in radiation intensity are comparable and only their
joint account allows to describe the experimental results. The comparison of
theory and experiment is carried out.


title:
Evidence for Exotic J^{PC}=1^{-+} Meson Production in the Reaction pi- p
  --> eta pi- p at 18 GeV/c

abstract:
  Details of the analysis of the eta pi- system studied in the reaction pi^{-}
p --> eta pi^{-} p at 18 GeV/c are given. Separate analyses for the 2 gamma and
pi+ pi- pi0 decay modes of the eta are presented. An amplitude analysis of the
data indicates the presence of interference between the a(2)(1320)- and a
J^{PC}=1^{-+} wave between 1.2 and 1.6 GeV/c^2. The phase difference between
these waves shows phase motion not attributable solely to the a(2)(1320)-. The
data can be fitted by interference between the a(2)(1320)- and an exotic 1^{-+}
resonance with M = 1370 +-16 +50 -30} MeV/c^2 and Gamma = 385 +- 40 +65 -105
MeV/c^2. Our results are compared with those of other experiments.


title:
$B^0 - \bar{B}^0$ oscillations and measurements of $|V_{ub}|/|V_{cb}|$
  at LEP

abstract:
  In this paper a review of the LEP analyses on $B^0 - \bar{B}^0$ oscillations
and on the measurement of $|V_{ub}|/|V_{cb}|$ is presented . These measurements
are of fundamental importance in constraining the $\rho$ and $\eta$ parameters
of the CKM matrix. A review of the current status of the $V_{CKM}$ matrix
determination is also given.


title:
Search for Baryon and Lepton Number Violating Decays of the $\tau$
  Lepton

abstract:
  We have searched for five decay modes of the tau lepton that simultaneously
violate lepton and baryon number: tau -> anti-proton gamma, tau -> anti-proton
pi0, tau -> anti-proton eta, tau -> anti-proton 2pi0, and tau -> anti-proton
pi0eta. The data used in the search were collected with the CLEO II detector at
the Cornell Electron Storage Ring (CESR). The integrated luminosity of the data
sample is 4.7 fb^{-1}, corresponding to the production of 4.3 x 10^6 tau+tau-
events. No evidence is found for any of the decays, resulting in much improved
upper limits on the branching fractions for the two-body decays and first upper
limits for the three-body decays.


title:
Confidence Level Computation for Combining Searches with Small
  Statistics

abstract:
  This article describes an efficient procedure for computing approximate
confidence levels for searches for new particles where the expected signal and
background levels are small enough to require the use of Poisson statistics.
The results of many independent searches for the same particle may be combined
easily, regardless of the discriminating variables which may be measured for
the candidate events. The effects of systematic uncertainty in the signal and
background models are incorporated in the confidence levels. The procedure
described allows efficient computation of expected confidence levels.


title:
The program of research at hadronic beams of ITEP accelerator.
  (Collection of experimental proposals)

abstract:
  This is a collection of proposals of experiments at hadronic beams of 10 GeV
accelerator, situated at the Institute of Theoretical and Experimental Physics
(Moscow, Russia). The proposals were presented by the leaders of several ITEP
experimental groups and include selected problems of hadron-hadron (exotic
states, scalar mesons, electomagnetic form factors, polarization phenomena
etc.) and hadron-nucleon interactions (flucton and nuclear matter properties,
hadron properties inside nuclei, interactions at small distances). Most of
proposals are united by an idea of a common magnetic spectrometer with LiH(D)
and polarized targets, wich could be built on the base of an existing 3m
magnet. Some of them also refer to the intrinsic accelerator beam and to the
new ion ring.


title: An electromagnetic shashlik calorimeter with longitudinal segmentation

abstract:
  A novel technique for longitudinal segmentation of shashlik calorimeters has
been tested in the CERN West Area beam facility. A 25 tower very fine samplings
e.m. calorimeter has been built with vacuum photodiodes inserted in the first 8
radiation lengths to sample the initial development of the shower. Results
concerning energy resolution, impact point reconstruction and electron/pion
separation are reported.


title: Tests of the Electroweak Symmetry Breaking Sector at the Tevatron

abstract:
  The phenomenology of the electroweak symmetry breaking sector is expected to
involve resonances decaying preferentially into heavy fermions. Three recent
CDF analyses are reviewed and used to constrain Higgs and Technicolor models.


title:
Study of a Like-Sign Dilepton Search for Chargino-Neutralino Production
  at CDF

abstract:
  We propose a like-sign dilepton search for chargino-neutralino production in
p-pbar collisions at sqrt(s) = 1.8 TeV, which complements the previously
published trilepton search by the CDF detector using Fermilab Run I data. Monte
Carlo predictions for the signal and background efficiencies indicate a
significant increase in sensitivity to chargino-neutralino production compared
to the traditional trilepton analysis alone.


title: Measurement of Charm Meson Lifetimes

abstract:
  We report measurements of the $D^0, D^+$, and $D^+_s$ meson lifetimes using
$3.7 fb^{-1}$ of e^+e^- annihilation data collected near the $\Upsilon(4S)$
resonance with the CLEO detector. The lifetimes of the $D^0, D^+$, and $D^+_s$
mesons are measured to be $408.5 \pm 4.1 ^{+3.5}_{-3.4} fs, 1033.6 \pm 22.1
^{+9.9}_{-12.7} fs$, and $486.3 \pm 15.0 ^{+4.9}_{-5.1} fs$, respectively. The
precisions of the charm meson lifetimes reported here are comparable to those
of the best previous measurements, and the systematic errors are very
different. In a single experiment we find that the ratio of the $D^+_s$ and
$D^0$ lifetimes differs from one by more than 4.5 standard deviations.


title:
A Comparison of the LSND and KARMEN Anti-neutrino Oscillation
  Experiments

abstract:
  The LSND and KARMEN neutrino oscillation experiments are compared in order to
clarify the significance of the apparent disagreement between their results.


title:
Search for Squarks and Gluinos in Events Containing Jets and a Large
  Imbalance in Transverse Energy

abstract:
  Using data corresponding to an integrated luminosity of 79 pb-1, D0 has
searched for events containing multiple jets and large missing transverse
energy in pbar-p collisions at sqrt(s)=1.8 TeV at the Fermilab Tevatron
collider. Observing no significant excess beyond what is expected from the
standard model, we set limits on the masses of squarks and gluinos and on the
model parameters m_0 and m_1/2, in the framework of the minimal low-energy
supergravity models of supersymmetry. For tan(beta) = 2 and A_0 = 0, with mu <
0, we exclude all models with m_squark < 250 GeV/c^2. For models with equal
squark and gluino masses, we exclude m < 260 GeV/c^2.


title: Limits on the Majorana neutrino mass in the 0.1 eV range

abstract:
  The Heidelberg-Moscow experiment gives the most stringent limit on the
Majorana neutrino mass. After 24 kg yr of data with pulse shape measurements,
we set a lower limit on the half-life of the neutrinoless double beta decay in
76Ge of T_1/2 > 5.7 * 10^{25} yr at 90% C.L., thus excluding an effective
Majorana neutrino mass greater than 0.2 eV. This allows to set strong
constraints on degenerate neutrino mass models.


title:
A 16-channel Digital TDC Chip with internal buffering and selective
  readout for the DIRC Cherenkov counter of the BABAR experiment

abstract:
  A 16-channel digital TDC chip has been built for the DIRC Cherenkov counter
of the BaBar experiment at the SLAC B-factory (Stanford, USA). The binning is
0.5 ns, the conversion time 32 ns and the full-scale 32 mus. The data driven
architecture integrates channel buffering and selective readout of data falling
within a programmable time window. The time measuring scale is constantly
locked to the phase of the (external) clock. The linearity is better than 80 ps
rms. The dead time loss is less than 0.1% for incoherent random input at a rate
of 100 khz on each channel. At such a rate the power dissipation is less than
100 mw. The die size is 36 mm2.


title:
Study of the Photonuclear interaction of muons in rock with the MACRO
  experiment

abstract:
  We present first results about the measurement of the charged hadrons
production by atmopsheric muons in the rock above MACRO. A comparison between
the measure rate with the Monte Carlo expectation is presented


title: The Micro Wire Detector

abstract:
  We present the performance of a new proportional gas detector. Its geometry
consists of a cathode plane with 70x70 micron apertures, crossed by 25 micron
anode strips to which it is attached by 50 micron kapton spacers. In the region
where the avalanche takes place, the anode strips are suspended in the gas
mixture like in a standard wire chamber. This detector exhibits high rate
capability and large gains, introducing very little material.


abstract:
  We present first results about the measurement of the charged hadrons
production by atmopsheric muons in the rock above MACRO. A comparison between
the measurerate with the Monte Carlo expectation is presented.


title: Elastic Electroproduction of rho Mesons at HERA

abstract:
  The elastic electroproduction of rho mesons is studied at HERA with the H1
detector for a photon virtuality in the range 1 < Q^2 < 60 GeV^2 and for a
hadronic centre of mass energy in the range 30 < W < 140 GeV. The shape of the
pipi mass distribution in the rho resonance region is measured as a function of
Q^2. The full set of rho spin density matrix elements is determined, and
evidence is found for a helicity flip amplitude at the level of 8 +- 3 % of the
non-flip amplitudes. Measurements are presented of the dependence of the cross
section on Q^2, W and t (the four-momentum transfer squared to the proton).
They suggest that, especially at large Q^2, the gamma^*p cross section develops
a stronger W dependence than that expected from the behaviour of elastic and
total hadron-hadron cross sections.


title: Measurement of the W Mass from LEP2

abstract:
  In 1997 each LEP experiment collected approximately $55 {pb}^{-1}$ of data at
a center-of-mass energy of 183 GeV. These data yield a sample of candidate
$e^+e^- \to W^+W^-$ events from which the mass of the W boson, M_W, is
measured. The preliminary LEP combined result, including data taken at $\roots
= 161$ and 172 GeV and assuming the Standard Model relation between the W decay
width and mass, is $M_W = 80.38 \pm 0.07 (exp) \pm 0.03 (CR/BE) \pm 0.02
(E_{bm})$ GeV, where the uncertainties correspond to experimental,
colour-reconnection/Bose-Einstein, and LEP beam energy respectively.


title: Intermittency and Correlations in Hadronic Z Decays

abstract:
  A multidimensional study of local multiplicity fluctuations and multiparticle
correlations of hadrons produced in Z decays is performed. The study is based
on the data sample of more than 4 million events recorded with the OPAL
detector at LEP. The fluctuations and correlations are analysed in terms of the
normalized scaled factorial moments and cumulants up to the fifth order. The
moments are observed to have intermittency-like behaviour, which is found to be
more pronounced with increasing dimension. The large data sample allows for the
first time a study of the factorial cumulants in e+e- annihilation. The
analysis of the cumulants shows the existence of genuine multiparticle
correlations with a strong intermittency rise up to higher orders. These
correlations are found to be stronger in higher dimensions. The decomposition
of the factorial moments into lower-order correlations shows that the dynamical
fluctuations have important contributions from genuine many-particle
correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 are found to
reproduce the trend of the measured moments and cumulants but they
underestimate the magnitudes. The results are found to be consistent with QCD
jet formation dynamics, although additional contributions from other mechanisms
in the hadronization process cannot be excluded.


title:
Hadronic Structure in the Decay $\tau^{-}\to
  \nu_{\tau}\pi^{-}\pi^{0}\pi^{0}$ and the Sign of the Tau Neutrino Helicity

abstract:
  Based on a sample corresponding to 4.3 million produced tau-pair events, we
have studied hadronic dynamics in the decay tau- --> nu_tau pi- pi0 pi0 in data
recorded by the CLEO II detector operating at the CESR e+e- collider. The decay
is dominated by the process tau --> nu_tau a_1(1260), with the a_1 meson
decaying to three pions predominantly via the lowest dimensional (mainly
S-wave) a_1 --> rho pi Born amplitude. From fits to the Dalitz plot and angular
observables, we find significant additional contributions from amplitudes for
a_1 decay to sigma pi, f_0(1370) pi and f_2(1270) pi, as well as higher
dimensional a_1 --> rho pi and rho' pi amplitudes. The squared sigma pi
amplitude accounts for ~15% of the total tau- --> nu_tau pi- pi0 pi0 rate in
the models considered. We have searched for additional contributions from tau
--> nu_tau pi'(1300). We place 90% confidence level upper limits on the
branching fraction for this channel of between 1.0*10^{-4} and 1.9*10^{-4},
depending on the pi' decay mode. The pi- pi0 pi0 mass spectrum is parametrized
by a Breit-Wigner form with a mass-dependent width which is specified according
to the results of the Dalitz plot fits plus a coupling to an a_1 --> K* K
amplitude. From a chi^2 fit, we extract the pole mass and width of the a_1, as
well as the magnitude of the K* K coupling. We have also investigated the
impact of a possible contribution from the a_1'(1700) meson on this spectrum.
Finally, exploiting the parity-violating angular asymmetry in a_1 --> 3pi
decay, we determine the signed value of the tau neutrino helicity to be
h_{\nu_\tau} = -1.02 +- 0.13(stat.) +- 0.03(syst.+model), confirming the
left-handedness of the tau neutrino.


title: The CLEO-III Ring Imaging Cherenkov Detector

abstract:
  The CLEO-III Detector upgrade for charged particle identification is
discussed. The RICH design uses solid LiF crystal radiators coupled with
multi-wire chamber photon detectors, using TEA as the photosensor, and
low-noise Viking readout electronics. Results from our beam test at Fermilab
are presented.


title: Measurements of the QED Structure of the Photon

abstract:
  The structure of both quasi-real and highly virtual photons is investigated
using the reaction e+e- -> e+e-mu+mu-, proceeding via the exchange of two
photons.
  The results are based on the complete OPAL dataset taken at e+e-
centre-of-mass energies close to the mass of the Z boson.
  The QED structure function F_2^gamma and the differential cross-section
dsigdx for quasi-real photons are obtained as functions of the fractional
momentum x from the muon momentum which is carried by the struck muon in the
quasi-real photon for values of Q**2 ranging from 1.5 to 400 GeV**2.
  The differential cross-section dsigdx for highly virtual photons is measured
for 1.5< Q**2 < 30 GeV**2 and 1.5< P**2 < 20 GeV**2, where Q**2 and P**2 are
the negative values of the four-momentum squared of the two photons such that
Q**2 > P**2.
  Based on azimuthal correlations the QED structure functions F_A^gamma and
F_B^gamma for quasi-real photons are determined for an average Q**2 of 5.4
GeV**2.


title:
NOE: a neutrino experiment for the CERN-Gran Sasso Long Base line
  project

abstract:
  The project of a large underground experiment (NOE) devoted to long baseline
neutrino oscillation measurement is presented


title: B and D Spectroscopy at LEP

abstract:
  Results from the four LEP experiments ALEPH, DELPHI, L3, and OPAL on the
spectroscopy of B and charmed mesons are presented. The predictions of Heavy
Quark Effective Theory (HQET) for the masses and the widths of excited L=1 B
mesons are supported by a new measurement from L3. A few B_c candidate eve nts
have masses consistent with the recent CDF observation and the predictions. New
results on Ddstar production and B -> Ddstar l nu are also presented. The
evidence for a Dstarpr meson reported recently by DELPHI is not supported by
OPAL and CLEO.


title: News on Neutrino Oscillations and Neutrino Masses

abstract:
  Recent results on neutrino oscillations and neutrino masses are presented.
The most exciting news are the Super-Kamiokande measurements of atmospheric
neutrinos, which show evidence for the neutrinos being massive. Various
possible schemes for the neutrino masses are discussed.


title: Search for Charged Higgs Bosons in Decays of Top Quark Pairs

abstract:
  We present a search for charged Higgs bosons in decays of pair-produced top
quarks using 109.2 +- 5.8 pb^-1 of data recorded from ppbar collisions at
sqrt{s} = 1.8 TeV by the D0 detector during 1992-96 at the Fermilab Tevatron.
No evidence is found for charged Higgs production, and most parts of the
[m(H+),tan(beta)] parameter space where the decay t -> bH+ has a branching
fraction close to or larger than that for t -> bW+ are excluded at 95%
confidence level. Assuming m(t) = 175 GeV and sigma(ppbar -> ttbar) = 5.5 pb,
for m(H+) = 60 GeV, we exclude tan(beta) < 0.97 and tan(beta) > 40.9.


title: Measurement of the Decay KL -> Pi0 Gamma Gamma

abstract:
  We report on a new measurement of the decay KL -> pi0 gamma gamma by the KTeV
experiment at Fermilab. We determine the KL -> pi0 gamma gamma branching ratio
to be (1.68 +/- 0.07 +/- 0.08)x10**-6. Our data shows the first evidence for a
low-mass gamma gamma signal as predicted by recent O(p**6) chiral perturbation
calculations that include vector meson exchange contributions. From our data,
we extract a value for the effective vector coupling aV = -0.72 +/- 0.05 +/-
0.06.


title: Two-photon reactions with KLOE detector at DA$\Phi$NE

abstract:
  We reexamine the feasibility of two-photon reactions at DA$\Phi$NE with the
KLOE detector excluding the small angle tagging system. Event-rate predictions
of interesting channels : $\gamma \gamma \to \pi^0, \eta $ and $\gamma \gamma
\to \pi^+ \pi^-, \pi^0 \pi^0$ are discussed.


title:
Search for charged Higgs bosons in e+e- collisions at sqrt(s) = 181-184
  GeV

abstract:
  Data collected at centre-of-mass energies of 181-184 GeV by ALEPH at LEP
corresponding to an integrated luminosity of 56.9 pb-1, are analysed in a
search for pair-produced charged Higgs bosons H+-. Three analyses are employed
to select the tau^+ nu_tau tau^- nubar_tau, c sbar tau^- nubar_tau/ cbar s
tau^+ nu_tau and c sbar s cbar final states. No evidence for a signal is found.
Mass limits are set as a function of the branching fraction B(H+ -> tau^+
nu_tau). Under the assumption that the decay modes considered cover the
totality of the possible final states, charged Higgs bosons with masses below
59 GeV/c^2 are excluded at 95% C.L. independently of B(H+ -> tau^+ nu_tau).


title:
Characteristics of Alpha, Gamma and Nuclear Recoil Pulses from NaI(Tl)
  at 10-100 keV Relevant to Dark Matter Searches

abstract:
  Measurements of the shapes of scintillation pulses produced by nuclear
recoils, alpha particles and photons in NaI(Tl) crystals at visible energies of
10-100 keV have been performed in order to investigate possible sources of
background in NaI(Tl) dark matter experiments and, in particular, the possible
origin of the anomalous fast time constant events observed in the UK Dark
Matter Collaboration experiments at Boulby mine. Pulses initiated by X-rays
(via photoelectric effect close to the surface of the crystal) were found not
to differ from those produced by high-energy photons (via Compton electrons
inside the crystal) within experimental errors. However, pulses induced by
alpha particles (degraded from an external MeV source) were found to be ~10%
faster than those of nuclear recoils, but insufficiently fast to account for
the anomalous events.


title: Spin Physics at e^+e^- Colliders

abstract:
  A large number of measurements with polarized beams and/or spin analysis of
final state particles has been performed at the e^+e^- colliders LEP and SLC,
providing important information on the dynamics of high energy interactions. In
this paper three subjects, for which the role of spin studies was particularly
relevant, will be covered: the measurements of the electroweak couplings, the
study of fragmentation dynamics and the search for physics beyond the Standard
Model.


title: B Lifetimes, Mixing and CP Violation at CDF

abstract:
  We review the status of bottom quark physics at the CDF experiment. The
measurements reported are based on about 110 pb-1 of data collected at the
Fermilab Tevatron pp= Collider operating at sqrt{s} = 1.8 TeV. In particular,
we review results on B hadron lifetimes, measurements of the time dependence of
B0 B0= oscillations, and a search for CP violation in B0 --> J/Psi K0s decays.
Prospects for future B physics at CDF in the next run of the Tevatron Collider
starting in the year 2000 are also given.


title: Preliminary Direct Measurement of the s-Quark Asymmetry

abstract:
  We present a preliminary direct measurement of the parity violating coupling
of the Z boson to strange quarks, A_s, derived from a sample of approximately
300,000 hadronic decays of Z bosons produced with a polarized electron beam and
recorded by the SLD experiment at SLAC between 1993 and 1997. Events with
primary strange quarks are tagged by the presence in each event hemisphere of a
high-momentum charged K meson, neutral K meson or Lambda hyperon identified
using the Cherenkov Ring Imaging Detector and/or a mass tag. The CCD vertex
detector is used to suppress the background from heavy flavor events. The
strangeness of the tagged particle is used to sign the event thrust axis in the
direction of the initial strange quark. The coupling A_s is obtained directly
from a measurement of the left-right-forward-backward production asymmetry in
polar angle of the tagged strange quark. To reduce the model dependence of the
measurement, the background from primary up and down events is measured from
the data, as is the analyzing power of the method for primary strange events.
We measure A_s = 0.82+-0.10(stat.)+-0.08(syst.) (preliminary).


title:
First study of the structure of e+e- -> b bbar g events and limits on
  the anomalous chromomagnetic moment of the b-quark

abstract:
  The structure of e+e- -> b bbar g events was studied using Z0 decays recorded
in the SLD experiment at SLAC. Three-jet final states were selected and the
CCD-based vertex detector was used to identify two of the jets as b or bbar.
Distributions of the gluon energy and polar angle were measured over the full
kinematic range for the first time, and compared with perturbative QCD
predictions. The energy distribution is potentially sensitive to an anomalous b
chromomagnetic moment kappa. We measured kappa to be consistent with zero and
set the first limits on its value, -0.17 < kappa < 0.11 at 95% c.l.


title: Tests of the Equivalence Principle with Neutral Kaons

abstract:
  We test the Principle of Equivalence for particles and antiparticles, using
CPLEAR data on tagged K0 and K0bar decays into pi^+ pi^-. For the first time,
we search for possible annual, monthly and diurnal modulations of the
observables |eta_{+-}| and phi_{+-}, that could be correlated with variations
in astrophysical potentials. Within the accuracy of CPLEAR, the measured values
of |eta_{+-}| and phi_{+-} are found not to be correlated with changes of the
gravitational potential. We analyze data assuming effective scalar, vector and
tensor interactions, and we conclude that the Principle of Equivalence between
particles and antiparticles holds to a level of 6.5, 4.3 and 1.8 x 10^{-9},
respectively, for scalar, vector and tensor potentials originating from the Sun
with a range much greater than the distance Earth-Sun. We also study
energy-dependent effects that might arise from vector or tensor interactions.
Finally, we compile upper limits on the gravitational coupling difference
between K0 and K0bar as a function of the scalar, vector and tensor interaction
range.


title: Measurement of radon concentrations at Super-Kamiokande

abstract:
  Radioactivity from radon is a major background for observing solar neutrinos
at Super-Kamiokande. In this paper, we describe the measurement of radon
concentrations at Super-Kamiokande, the method of radon reduction, and the
radon monitoring system. The measurement shows that the current low-energy
event rate between 5.0 MeV and 6.5 MeV implies a radon concentration in the
Super-Kamiokande water of less than 1.4 mBq/m$^3$.


title:
Measurement of the branching ratio of pi^0 -> e^+e^- using K_L -> 3 pi^0
  decays in flight

abstract:
  The branching ratio of the rare decay pi^0 -> e^+e^- has been measured in
E799-II, a rare kaon decay experiment using the KTeV detector at Fermilab. The
pi^0's were produced in fully-reconstructed K_L -> 3 pi^0 decays in flight. We
observed 275 candidate pi^0 -> e^+e^- events, with an expected background of
21.4 +- 6.2 events which includes the contribution from Dalitz decays. We
measured BR(pi^0 -> e^+e^-, x>0.95) = (6.09 +- 0.40 +- 0.24) times 10^{-8},
where the first error is statistical and the second systematic. This result is
the first significant observation of the excess rate for this decay above the
unitarity lower bound.


title: Charmonium Production in Deep Inelastic Scattering at HERA

abstract:
  The electroproduction of J/psi and psi(2S) mesons is studied in elastic,
quasi-elastic and inclusive reactions for four momentum transfers 2 < Q^2 < 80
GeV^2 and photon-proton centre of mass energies 25 < W < 180 GeV. The data were
taken with the H1 detector at the electron proton collider HERA in the years
1995 to 1997. The total virtual photon-proton cross section for elastic J/psi
production is measured as a function of Q^2 and W. The dependence of the
production rates on the square of the momentum transfer from the proton (t) is
extracted. Decay angular distributions are analysed and the ratio of the
longitudinal and transverse cross sections is derived. The ratio of the cross
sections for quasi-elastic psi(2S) and J/psi meson production is measured as a
function of Q^2. The results are discussed in terms of theoretical models based
upon perturbative QCD. Differential cross sections for inclusive and inelastic
production of J/psi mesons are determined and predictions within two
theoretical frameworks are compared with the data, the non-relativistic QCD
factorization approach including colour octet and colour singlet contributions,
and the model of Soft Colour Interactions.


title: C-Parameter and Jet Broadening at PETRA Energies

abstract:
  e^+e^- annihilation data recorded by the JADE detector at PETRA were used to
measure the C-parameter for the first time at \sqrt{s}= 35 and 44 GeV. The
distributions were compared to a resummed QCD calculation.
  In addition, we applied extended resummed calculations to the total and wide
jet broadening variables, B_T and B_W. We combined the results on \alpha_s with
those of our previous study of differential 2-jet rate, thrust, and heavy jet
mass, obtaining
  \alpha_s(35 GeV) = 0.1448 +0.0117 -0.0070 and \alpha_s(44 GeV) = 0.1392
+0.0105 -0.0074.
  Moreover power corrections to the mean values of the observables mentioned
above were investigated considering the Milan factor and the improved
prediction for the jet broadening observables.
  Our study, which considered e^+e^- data of five event shape observables
between \sqrt{s}= 14 and 183 GeV, yielded \alpha_s(M_{Z^0})=0.1177 +0.0035
-0.0034.


title: A search for energy deposition by neutrinos in matter

abstract:
  An exploratory search for an anomalous energy deposition by neutrinos in a
germanium crystal was performed in the CERN high energy neutrino beam. No
signal was found and a limit is set at a level of about 10^-12 of the normal
dE/dx for a minimum ionizing particle.


title:
Measurement of B0 - B0-bar flavor oscillations using jet-charge and
  lepton flavor tagging in p p-bar collisions at sqrt[s]=1.8 TeV

abstract:
  We present a measurement of the mass difference Delta m_d for the B0 meson
and the statistical power of the b flavor tagging methods used. The measurement
uses 90 (1/pb) of data from p p-bar collisions at sqrt[s] = 1.8 TeV collected
with the CDF detector. An inclusive lepton trigger is used to collect a large
sample of B hadron semileptonic decays. The mass difference Delta m_d is
determined from the proper time dependence of the fraction of B hadrons that
undergo flavor oscillations. The flavor at decay is inferred from the charge of
the lepton from semileptonic B decay. The initial flavor is inferred by
determining the flavor of the other B hadron produced in the collision, either
from its semileptonic decay (soft-lepton tag) or from its jet charge. The
measurement yields Delta m_d = 0.500 +/- 0.052 +/- 0.043 hbar/ps, where the
first uncertainty is statistical and the second uncertainty is systematic. The
statistical powers (epsilon D^2) of the soft-lepton and jet-charge flavor
taggers are (0.91 +/- 0.10 +/- 0.11) % and (0.78 +/- 0.12 +/- 0.08) %,
respectively.


title:
Measurements of Lifetimes and a Limit on the Lifetime Difference in the
  Neutral D-Meson System

abstract:
  Using the large hadroproduced charm sample collected in experiment E791 at
Fermilab, we report the first directly measured constraint on the decay-width
difference Delta Gamma for the mass eigenstates of the D0-D0bar system. We
obtain our result from lifetime measurements of the decays D0 --> K-pi+ and D0
--> K-K+, under the assumption of CP invariance, which implies that the CP
eigenstates and the mass eigenstates are the same. The lifetime of D0 --> K-K+
(the CP-even final state is \tau_KK = 0.410 +/- 0.011 +/- 0.006 ps, and the
lifetime of D0 --> K-pi+ (an equal mixture of CP-odd and CP-even final states
is tau_Kpi = 0.413 +/- 0.003 +/- 0.004 ps. The decay-width difference is Delta
Gamma = 2(Gamma_KK - Gamma_Kpi) = 0.04 +/- 0.14 +/- 0.05 ps^-1. We relate these
measurements to measurements of mixing in the neutral D-meson system.


title: Search for the Standard Model Higgs Boson at LEP

abstract:
  Preliminary results from the four LEP experiments using data collected at 189
GeV have shown no evidence for the Standard Model Higgs boson. The preliminary
95% confidence level lower limits on the SM Higgs boson mass from ALEPH,
DELPHI, OPAL, and L3 are 90.4 GeV, 94.1 GeV, 95.5 GeV, and 95.2 GeV,
respectively. When LEP finishes in the year 2000, each experiment expects to
collect 200 pb-1 of data at 200 GeV. These data will allow the discovery of the
SM Higgs boson with a mass lower than about 105 GeV. Assuming that no new
evidence for the SM Higgs boson is found, the mass exclusion limit would be
approximately 110 GeV.


title: One-prong tau decays with kaons

abstract:
  One-prong tau decays into final states involving kaons are studied with about
161k tau+tau- events collected by the ALEPH detector from 1991 to 1995. Charged
kaons are identified by dE/dx measurement, while K0L's are detected through
their interaction in calorimeters. Branching ratios are measured for the
inclusive mode, B(tau- -> K-Xnu_tau)=(1.52 +- 0.04 +- 0.04)%, where X can be
any system of neutral particles, and for the exclusive modes
  B(tau- to K- nu_tau) = (6.96 =- 0.25 +- 0.14)x 10-3, B(tau- to K- pi0 nu_tau)
= (4.44 +- 0.26 +- 0.24)x 10-3, B(tau-to K- pi0 pi0 nu_tau)= (0.56 +- 0.20 +-
0.15) x 10-3, B(tau- to K- pi0 pi0 pi0 nu_tau = (0.37 +- 0.21 +- 0.11) x 10-3,
B(tau- to K-K0 nu_tau) = (1.62 +- 0.21 +- 0.11) x 10-3, B(tau- to K-K0 pi0
nu_tau) = (1.43 +- 0.25 +- 0.21)x 10-3, B(tau- to \overline{K0} pi- nu_tau) =
(9.28 +- 0.45 +- 0.34)x 10-3, B(tau- to \overline{K0} pi-pi0 nu_tau) = (3.47 +-
0.53 +- 0.37) x 10-3.
  Upper limits for B(tau- to \overline{K0} pi- pi0 pi0 nu_tau) and B(tau- to K-
K0 pi0 pi0 nu_tau are also obtained. Mass spectra in the final states are
addressed in order to study the relevant dynamics.


title:
Study of tau decays involving kaons, spectral functions and
  determination of the strange quark mass

abstract:
  All ALEPH measurements of branching ratios of tau decays involving kaons are
summarized including a combination of results obtained with K^0_S and K^0_L
detection. The decay dynamics are studied, leading to the determination of
contributions from vector K^*(892) and K^{*}(1410), and axial-vector K_1(1270)
and K_1(1400) resonances. Agreement with isospin symmetry is observed among the
different final states. Under the hypothesis of the conserved vector current,
the spectral function for the K\bar{K}\pi mode is compared with the
corresponding cross section for low energy e^+e^- annihilation, yielding an
axial-vector fraction of (94^{+6}_{-8})% for this mode. The branching ratio for
tau decay into all strange final states is determined to be B(\tau^-\to
X^-(S=-1)\nu_\tau)=(28.7\pm1.2)\times 10^{-3}. The measured mass spectra of the
strange tau decay modes are exploited to derive the S=-1 spectral function. A
combination of strange and nonstrange spectral functions is used to determine
the strange quark mass and nonperturbative contributions to the strange
hadronic width. A method is developed to avoid the bad convergence of the spin
zero hadronic component, with the result m_s(M_\tau^2)=(176^{+46}_{-57})
MeV/c^2. The evolution down to 1 GeV gives m_s(1 {GeV}^2) = (234^{+61}_{-76})
MeV/c^2.


title: K_L -> pi^0 nu nubar at the AGS (E926)

abstract:
  A proposed experiment to measure K_L -> pi^0 nu nubar at the AGS (E926) is
described. It adopts a unique but general strategy of rare decay measurements
with two independent rejection criteria, which allows reliable measurements of
background levels. The method employs hermetic veto and full kinematic
reconstruction using kaon time of flight and kinematic reconstruction of pi^0.
Backgrounds are suppressed to a level well below an anticipated signal in the
range 3 x 10^{-11}.


title: Hadron-Photon Interactions in COMPASS

abstract:
  The COMPASS experiment at CERN SPS will use hadron beams (pion, kaon and
proton) and muons at 50-280 GeV/c and virtual photon targets to investigate,
via Primakoff effect, important hadron properties: polarizability, chiral
anomaly, radiative transitions and hybrid meson production. We present
simulation studies to optimize the beam, detector setup and trigger for
measuring with high statistics above topics.


title: A Search for CP(T) Violation in B Decays at OPAL

abstract:
  A search for CP(T) violation is performed and the fractional difference
between the $b$ and $\bar b$ hadron lifetimes is measured using reconstructed
secondary vertices in inclusive B hadron decays culled from 3.1 million $Z^0
\to q \bar q$ events. The data were collected by the OPAL experiment at the LEP
collider at CERN at $\sqrt{s} \approx 91$ GeV from 1991-1995.


title:
Analytical Representation of the Longitudinal Hadronic Shower
  Development

abstract:
  The analytical representation of the longitudinal hadronic shower development
from the face of a calorimeter is presented and compared with experimental
data. The suggested formula is particularly useful at designing, testing and
calibration of huge calorimeter complex like in ATLAS at LHC.


title: Recent QCD Results from LEP-1 and LEP-2

abstract:
  A summary is given of some recent QCD results from LEP. For LEP-2, the topics
include event shape measurements, determinations of the strong coupling
constant, and measurements of the charged particle multiplicity distribution at
the recently completed run at 189 GeV. For LEP-1, the topics presented are a
test of the flavor independence of the strong coupling constant and a study of
gluon jets using a hemisphere definition to correspond to analytic
calculations. For the combined LEP data samples, the topics include a test of
power law corrections for hadronization effects and the running of the strong
coupling strength.


title: Recent OPAL measurements in non-perturbative QCD

abstract:
  Using multihadronic Z0 decays recorded in 1991-1995 by the OPAL detector in
e+e- collisions at LEP1, experimental analyses were made of the following
subjects: (a) Bose-Einstein correlations; (b) Intermittency and correlations;
(c) rho and omega spin alignments; (d) A search for the tensor glueball
candidate fj(2200).


title:
Measurement of the 6S-7S transition polarizablility in atomic cesium and
  an improved test of the standard model

abstract:
  The ratio of the off-diagonal hyperfine amplitude to the tensor transition
polarizability (Mhf/beta) for the 6S-7S transition in cesium has been measured.
The value of beta=27.024(43)(expt)(67)(theory)a_0^3 is then obtained using an
accurate semi-empirical value of Mhf. This is combined with a previous
measurement of parity nonconservation in atomic cesium and previous atomic
structure calculations to determine the value of the weak charge. The
uncertainties in the atomic structure calculations are updated (and reduced) in
light of new experimental tests. The result Q_W=-72.06(28)(expt) (34)(theory)
differs from the prediction of the standard model of elementary particle
physics by 2.5 sigma.


title: Precision Crystal Calorimetry in High Energy Physics

abstract:
  Crystal Calorimetry is widely used in high energy physics because of its
precision. Recent development in crystal technology identified two key issues
to reach and maintain crystal precision: light response uniformity and
calibration in situ. Crystal radiation damage is understood. While the damage
in alkali halides is found to be caused by the oxygen/hydroxyl contamination,
it is the structure defects, such as oxygen vacancies, cause damage in oxides.


title: The Status of MSSM Higgs Boson Searches at LEP

abstract:
  The most recently available results from searches conducted by the four LEP
experiments at 189 GeV center-of-mass energy for Higgs bosons of the Minimal
Supersymmetric Standard Model (MSSM) are presented. No evidence for a signal
has been observed, and the null result is used by the experiments, both
individually and collectively, to exclude regions of the MSSM parameter space
and to set lower limits on Higgs boson masses at 95% confidence level in
constrained MSSM scenarios.


title: Study of the Decays KL -> pi+ pi- gamma and KL -> pi+ pi- e+ e- at KTeV

abstract:
  We present new results on the related rare KL decay modes KL -> pi+ pi- gamma
and KL -> pi+ pi- e+ e-. KTeV has performed the first direct measurement of the
form factor for the "direct emission" component of KL -> pi+ pi- gamma decays,
a quantity with ramifications for particular chiral models. In addition, the
form factor and direct emission/inner bremsstrahlung branching ratio - also
presented here - are important input parameters for the understanding of the
planar-angle distribution of KL -> pi+ pi- e+ e- decays. Preliminary results
indicating the presence of a T-violating asymmetry in the KL -> pi+ pi- e+ e-
angular distribution are presented.


title: Observation of the decay $K^+\to \pi^+ \nu \bar\nu$

abstract:
  We have observed 1 event consistent with the signature expected of the rare
decay of a positive kaon to a positive pion and a neutrino anti-neutrino pair.
In the examined momentum region of 211 to 230 MeV/c in the center of mass of
the kaon we estimated the backgrounds to be about $0.08 \pm 0.03$ events. From
this observation we estimate the branching ratio to be $4.2^{+9.7}_{-3.5}
\times 10^{-10}$. In this presentation I will explain the experiment, and the
analysis techniques. I will also discuss the expected improvements in the near
future from the analysis of new data sets.