title:
Measurement of the E(T,jet)^2/Q^2 dependence of forward-jet production
  at HERA

abstract:
  The forward-jet cross section in deep inelastic ep scattering has been
measured using the ZEUS detector at HERA with an integrated luminosity of 6.36
pb^-1. The jet cross section is presented as a function of jet transverse
energy squared, E(T,jet)^2, and Q^2 in the kinematic ranges
10^-2<E(T,jet)^2/Q^2<10^2 and 2.5 10^-4<x<8.0 10^-2. Since the perturbative QCD
predictions for this cross section are sensitive to the treatment of the
log(E_T/Q)^2 terms, this measurement provides an important test. The measured
cross section is compared to the predictions of a next-to-leading order pQCD
calculation as well as to various leading-order Monte Carlo models. Whereas the
predictions of all models agree with the measured cross section in the region
of small E(T,Jet)^2/Q^2, only one model, which includes a resolved photon
component, describes the data over the whole kinematic range.


title: An investigation on the b quark mass

abstract:
  In this article I will review the measurements of the b quark mass performed
by ALEPH and DELPHI and presented at the HEP99 Conference in Tampere. Very
clean effects of the mass running are observed, even if a wide spread in the
results and large systematic errors due to hadronization corrections prevent to
extract an average value of the running b quark mass.


title: Measurement of inclusive prompt photon photoproduction at HERA

abstract:
  First inclusive measurements of isolated prompt photons in photoproduction at
the HERA ep collider have been made with the ZEUS detector, using an integrated
luminosity of 38.4 pb$^{-1}$. Cross sections are given as a function of the
pseudorapidity and the transverse energy ($\eta^\gamma$, \eTg) of the photon,
for $\eTg > $ 5 GeV in the $\gamma p$ centre-of-mass energy range 134-285 GeV.
Comparisons are made with predictions from Monte Carlo models having
leading-logarithm parton showers, and with next-to-leading-order QCD
calculations, using currently available parameterisations of the photon
structure. For forward $\eta^\gamma$ (proton direction) good agreement is
found, but in the rear direction all predictions fall below the data.


title: Hadronic Structure in the Decay $\tau^{-}\to \pi^{-}\pi^{0}\nu_{\tau}$

abstract:
  We report on a study of the invariant mass spectrum of the hadronic system in
the decay tau- -> pi- pi0 nu_tau. This study was performed with data obtained
with the CLEO II detector operating at the CESR e+ e- collider. We present fits
to phenomenological models in which resonance parameters associated with the
rho(770) and rho(1450) mesons are determined. The pi- pi0 spectral function
inferred from the invariant mass spectrum is compared with data on e+ e- -> pi+
pi- as a test of the Conserved Vector Current theorem. We also discuss the
implications of our data with regard to estimates of the hadronic contribution
to the muon anomalous magnetic moment.


title: A New Measurement of the Rare Decay $K^+\to \pi^+ \mu^+ \mu^-$

abstract:
  More than 400 $K^{+}\to\pi^{+}\mu^+\mu^-$ events were observed in a rare
$K^+$ decay experiment at the AGS. Normalized to the
$K^{+}\to\pi^{+}\pi^+\pi^-$ decay, the branching ratio is determined to be
$(9.22 \pm 0.60 (stat) \pm 0.49 (syst))\times 10^{-8}$. This branching ratio
and the $\mu\mu$ mass spectrum is in very good agreement with the measurement
of the $K^{+}\to\pi^{+}e^+e^-$ decay, but deviates significantly from the
previous measurement.


title: The Search for Pentaquark Baryon with Hidden Strangeness

abstract:
  Evidences for new baryon states with mass >1.8 GeV were obtained in the
experiments of the SPHINX Collaboration in studying hyperon-kaon mass spectra
in several proton diffractive reactions. The main result of these experiments
is the observation of X(2000)->SIGMA K state with unusual dynamical features
(narrow width, anomalously large branching ratios for the decay channels with
strange particle emission). The possibility of the interpretation of this state
as cryptoexotic pentaquark baryon with hidden strangeness is discussed. The
additional data which are supported the real existence of X(2000) baryon are
also presented.


title:
Search for Scalar Top and Scalar Bottom Quarks in $p\bar{p}$ collisions
  at $\sqrt{s}=1.8$ TeV

abstract:
  We have searched for direct pair production of scalar top and scalar bottom
quarks in 88 pb$^{-1}$ of $p\bar{p}$ collisions at $\sqrt{s}=1.8$ TeV with the
CDF detector. We looked for events with a pair of heavy flavor jets and missing
energy, consistent with scalar top quark decays to a charm quark and a
neutralino, or scalar bottom quark decays to a bottom quark and a neutralino.
The numbers of events that pass our selection for each process show no
deviation from Standard Model expectations. We compare our results to
next-to-leading order calculations for the scalar quark production cross
sections to exclude regions in scalar quark-neutralino parameter space.


title: Search for Charmless Hadronic Decays of B Mesons with the SLD Detector

abstract:
  Based on a sample of approximately 500,000 hadronic Z0 decays accumulated
between 1993 and 1998, the SLD experiment has set limits on 24 fully charged
two-body and quasi two-body exclusive charmless hadronic decays of B+, B0, and
B0_s mesons. The precise tracking capabilities of the SLD detector provided for
the efficient reduction of combinatoric backgrounds, yielding the most precise
available limits for ten of these modes.


title: Hadron production in two-photon collisions at LEP-L3

abstract:
  The reaction e+ e- -> e+ e- gamma* gamma* -> e+ e- hadrons is analysed for
quasi-real virtual photons using data collected by the L3 detector during the
LEP high energy runs at sqrt(s) = 183 and 189 GeV. Preliminary results on the
cross sections sigma(e+e- -> e+e- hadrons) and sigma(gamma gamma -> hadrons)
are given in the interval 5 GeV < W_{gamma gamma} < 145 GeV. The centre-of-mass
energy dependence of the two-photon cross section is well described by the
universal Regge parametrisation, but with a steeper rise with energy as
compared to hadron-hadron cross sections. The data are also compared to the
expectations of different theoretical models. To investigate diffractive
processes, the elastic gamma gamma -> rho0 rho0 process and the inclusive rho0
production gamma gamma -> rho0 X are studied in the W_{gamma gamma} > 3 GeV
region. In all channels a comparison is made with the Pythia and Phojet Monte
Carlo generators.


title:
Total Cross Section Measurements with pi-, Sigma- and Protons on Nuclei
  and Nucleons around 600 GeV/c

abstract:
  Total cross sections for Sigma- and pi- on beryllium, carbon, polyethylene
and copper as well as total cross sections for protons on beryllium and carbon
have been measured in a broad momentum range around 600GeV/c. These
measurements were performed with a transmission technique adapted to the SELEX
hyperon-beam experiment at Fermilab. We report on results obtained for
hadron-nucleus cross sections and on results for sigma_tot(Sigma- N) and
sigma_tot(pi- N), which were deduced from nuclear cross sections.


title:
Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard
  Model in e+e- Interactions at \sqrt{s} = 189 GeV

abstract:
  A search for the lightest neutral scalar and neutral pseudoscalar Higgs
bosons in the Minimal Supersymmetric Standard Model is performed using 176.4
pb^-1 of integrated luminosity collected by L3 at a center-of-mass energy of
189 GeV. No signal is observed, and the data are consistent with the expected
Standard Model background. Lower limits on the masses of the lightest neutral
scalar and pseudoscalar Higgs bosons are given as a function of tan(beta).
Lower mass limits for tan(beta)>1 are set at the 95% confidence level to be m_h
> 77.1 GeV and m_A > 77.1 GeV.


title:
Performance of the CLEO III LiF-TEA Ring Imaging Cherenkov Detector in a
  High Energy Muon Beam

abstract:
  The CLEO III Ring Imaging Cherenkov detector uses LiF radiators to generate
Cherenkov photons which are then detected by proportional wire chambers using a
mixture of CH$_4$ and TEA gases. The first two photon detector modules which
were constructed, were taken to Fermilab and tested in a beam dump that
provided high momentum muons. We report on results using both plane and
"sawtooth" shaped radiators. Specifically, we discuss the number of
photoelectrons observed per ring and the angular resolution. The particle
separation ability is shown to be sufficient for the physics of CLEO III.


title: Recent Results on Rare b Decays

abstract: Recent experimental results on charmless rare b decays are reviewed.


title:
Search for Extra Dimensions in Boson and Fermion Pair Production in e+e-
  Interactions at LEP

abstract:
  Extra spatial dimensions are proposed by recent theories that postulate the
scale of gravity to be of the same order as the electroweak scale. A sizeable
interaction between gravitons and Standard Model particles is then predicted.
Effects of these new interactions in boson and fermion pair production are
searched for in the data sample collected at centre-of-mass energies above the
Z pole by the L3 detector at LEP. In addition, the direct production of a
graviton associated with a Z boson is investigated. No statistically
significant hints for the existence of these effects are found and lower limits
in excess of 1 TeV are derived on the scale of this new theory of gravity.


title: New Data from SND Detector in Novosibirsk

abstract:
  The current status of experiments with SND detector at VEPP-2M e^+e^-
collider in the energy range 2E_0=400-1400 MeV and recent results of data
analysis for $\phi$, $\omega$ and $\rho$ decays and e^+e^- annihilation into
hadrons are presented.


title: Rare Phi Decays and Exotic Hadrons

abstract:
  The results of the experimental study of the reactions e+e-->\pi\pi\gamma,
\eta\pi\gamma, \eta'\gamma, \omega\pi,... at VEPP-2M collider with CMD-2 and
SND detectors are presented. The branching ratios of \phi, \rho, \omega rare
decays were measured. The problem of the possible exotic nature of f0(980),
a(980) scalar mesons is discussed.


title:
New results on multiplicity, identified particles and spin measurements
  in e+e- collisions

abstract:
  The analyses of recent LEP data provide us with a rich ground for pQCD and
LPHD tests. A number of non-trivial effects predicted in the framework of MLLA
are experimentally verified. Recent measurements also enrich our knowledge
about the hadronization process.


title: Update of the Search for the Neutrinoless Decay $\tau \to \mu\gamma$

abstract:
  We present an update of the search for the lepton family number violating
decay tau -> mu gamma using 12.6 million tau+tau- pairs collected with the CLEO
detector. No evidence of a signal has been found and the corresponding upper
limit is BR(tau -> mu gamma) < 1.1x10^{-6} at 90% CL, significantly smaller
than previous experimental limits.


title: A novel concept for the detection of tau neutrino appearance

abstract:
  A novel concept for the detection of tau neutrinos is presented, potentially
suitable for use in a long-baseline neutrino oscillation experiment. It relies
on the direct identification of the tau leptons produced in charged-current
interactions, by imaging the Cherenkov light that the tau generates in C6F14
liquid. In a simple simulation about half of the tau leptons can be
successfully identified in this way.


title:
Observation of a Single-Spin Azimuthal Asymmetry in Semi-Inclusive Pion
  Electro-Production

abstract:
  Single-spin asymmetries for semi-inclusive pion production in deep-inelastic
scattering have been measured for the first time. A significant target-spin
asymmetry of the distribution in the azimuthal angle phi of the pion relative
to the lepton scattering plane was observed for pi+ electro-production on a
longitudinally polarized hydrogen target. The corresponding analyzing power in
the sin(phi) moment of the cross section is 0.022 +/- 0.005 +/- 0.003. This
result can be interpreted as the effect of terms in the cross section involving
chiral-odd spin distribution functions in combination with a time-reversal-odd
fragmentation function that is sensitive to the transverse polarization of the
fragmenting quark.


title: Radiative decays of light vector mesons

abstract:
  The new data on $\rho,\omega,\phi$ radiative decays into
$\pi^0\gamma,\eta\gamma,\eta'\gamma$ from SND experiment at VEPP-2M $e^+e^-$
collider are presented.


title: Search for Free Fractional Electric Charge Elementary Particles

abstract:
  We have carried out a direct search in bulk matter for free fractional
electric charge elementary particles using the largest mass single sample ever
studied - about 17.4 mg of silicone oil. The search used an improved and highly
automated Millikan oil drop technique. No evidence for fractional charge
particles was found. The concentration of particles with fractional charge more
than 0.16e (e being the magnitude of the electron charge) from the nearest
integer charge is less than $4.71\times10^{-22}$ particles per nucleon with 95%
confidence.


title: Study of top-quark reconstruction with LCD Fast Simulation

abstract:
  We report the study of top-quark reconstruction in $e^+e^- \to t\bar{t}$
events at a 500 GeV linear collider using the LCD Fast Simulator. The final
states of 6 jets as well as 4 jets and lepton are used. In order to reconstruct
the jets, the performance of charged and neutral cluster separation are
studied. We compare top-quark reconstruction for the LCD Small and LCD Large
detectors, including the effect of varying the calorimeter granularity.


title:
Precision Luminosity for Z0 Lineshape Measurements with a
  Silicon-Tungsten Calorimeter

abstract:
  The measurement of small-angle Bhabha scattering is used to determine the
luminosity at the OPAL interaction point for the LEP I data recorded between
1993 and 1995. The measurement is based on the OPAL Silicon-Tungsten
Luminometer which is composed of two calorimeters encircling the LEP beam pipe,
on opposite sides of the interaction point. The luminometer detects electrons
from small-angle Bhabha scattering at angles between 25 and 58mrad. At LEP
center-of-mass energies around the Z0, about half of all Bhabha electrons
entering the detector fall within a 79nb fiducial acceptance region. The
electromagnetic showers generated in the stack of 1 radiation length tungsten
absorber plates are sampled by 608 silicon detectors with 38,912 radial pads of
2.5mm width.The fine segmentation of the detector, combined with the precise
knowledge of its physical dimensions, allows the trajectories of incoming 45GeV
electrons or photons to be determined with a total systematic error of less
than 7microns. We have quantified all significant sources of systematic
experimental error in the luminosity determination by direct physical
measurement. All measured properites of the luminosity event sample are found
to be in agreement with current theoretical expectations. The total systematic
measurement uncertainty is 3.4x10^-4, significantly below the theoretical error
of 5.4x10^-4 currently assigned to the QED calculation of the Bhabha
acceptance, and contributes negligibly to the total uncertainty in the OPAL
measurement of Gamma{invisible}/Gamma{l+l-}, a quantity of basic physical
interest which depends crucially on the luminosity measurement.


title: BEAUTY'99 Conference Summary

abstract:
  Investigations of B hadrons are expected to break new ground in measuring
CP-violation effects. This series of BEAUTY conferences, originating from the
1993 conference in Liblice, has contributed significantly in developing ideas
of CP-violation measurements using B hadrons and formulating and comparing
critically the B-physics experiments. In the '99 conference in Bled we saw the
ripening of the field and the first fruit emerging - Tevatron have produced
beautiful B-physics results and more are expected to come with the next run,
while the B-physics experiments at DESY, SLAC and KEK are starting their
operation. The longer-term projects at LHC and Tevatron have taken their shape
and detailed prototyping work is going on. Meanwhile, on the phenomenological
side, there has been impressive theoretical progress in understanding deeper
the `standard' measurements and proposing new signatures. In this summary, I
will highlight the status of the field as presented in the conference,
concentrating on signatures, experiments, and R&D programmes.


title:
Topical Results on Vector-Meson Production from the HERA Collider
  Experiments

abstract:
  The HERA collider experiments H1 and ZEUS have established extensive
measurement programs for diffractive vector-meson production processes during
the first six years of their operation. The results provide stringent
phenomenological tests of quantum chromodynamical descriptions of hard
diffraction. We discuss recent topical results on Upsilon photoproduction, on
decay-angle analyses of rho^0, phi and J/psi electroproduction and on rho^0 and
phi photoproduction at high momentum transfer.


title:
Measurement of the W+W-gamma Cross-section and First direct Limits on
  Anomalous Electroweak Quartic Gauge Couplings

abstract:
  A study of W+W- events accompanied by hard photon radiation produced in e+e-
collisions at LEP is presented. Events consistent with two on-shell W-bosons
and an isolated photon are selected from 183pb^-1 of data recorded at
root{s}=189GeV. From these data, 17 W+W-gamma candidates are selected with
photon energy greater than 10GeV, consistent with the Standard Model
expectation. These events are used to measure the e+e- to W+W-gamma
cross-section within a set of geometric and kinematic cuts; sigma{W+W-gamma} =
136+-37+-8 fb, where the first error is statistical and the second systematic.
The photon energy spectrum is used to set the first direct, albeit weak, limits
on possible anomalous contributions to the {W+ W- gamma gamma} and {W+ W- gamma
Z0} vertices:
  -0.070GeV^{-2} < a_0/Lambda^2 < 0.070GeV^{-2},
  -0.13GeV^{-2} < a_c/Lambda^2 < 0.19GeV^{-2},
  -0.61GeV^{-2} < a_n/Lambda^2 < 0.57GeV^{-2}, where Lambda represents the
energy scale for new physics.


title:
New experimental data for the decays $\phi\to\mu^+\mu^-$ and
  $\phi\to\pi^+\pi^-$ from SND detector

abstract:
  The processes $e^+e^-\to\mu^+\mu^-$ and $e^+e^-\to\pi^+\pi^-$ have been
studied with SND detector at VEPP-2M $e^+e^-$ collider in the vicinity of
$\phi(1020)$ resonance. The branching ratios $B(\phi\to\mu^+\mu^-)=(3.30\pm
0.45\pm 0.32)\times 10^{-4}$ and $B(\phi\to\pi^+\pi^-)=(0.71\pm 0.11\pm
0.09)\times 10^{-4}$ were obtained.


title: Nuclear Effects on R = sigma_L / sigma_T in Deep-Inelastic Scattering

abstract:
  Cross section ratios for deep-inelastic scattering from 14N and 3He with
respect to 2H have been measured by the HERMES experiment at DESY using a 27.5
GeV positron beam. The data cover a range in the Bjorken scaling variable x
between 0.013 and 0.65, while the negative squared four-momentum transfer Q^2
varies from 0.5 to 15 GeV^2. The data are compared to measurements performed by
NMC, E665, and SLAC on 4He and 12C, and are found to be different for x < 0.06
and Q^2 < 1.5 GeV^2. The observed difference is attributed to an A-dependence
of the ratio R = sigma_L / sigma_T of longitudinal to transverse deep-inelastic
scattering cross sections at low x and low Q^2.


title:
Digital Pulseshape Analysis by Neural Networks for the
  Heidelberg-Moscow-Double-Beta-Decay-Experiment

abstract:
  The Heidelberg-Moscow Experiment is presently the most sensitive experiment
looking for neutrinoless double-beta decay. Recently the already very low
background has been lowered by means of a Digital Pulseshape Analysis using a
one parameter cut to distinguish between pointlike events and multiple
scattered events. To use all the information contained in a recorded digital
pulse, we developed a new technique for event recognition based on neural
networks.


title: Tau Electroweak Couplings

abstract:
  We review world-average measurements of the tau lepton electroweak couplings,
in both decay (including Michel parameters) and in production ($Z^0\to
\tau^+\tau^-$ and $W^-\to\tau^-\nubar_\tau$). We review the searches for
anomalous weak and EM dipole couplings. Finally, we present the status of
several other tau lepton studies: searches for lepton flavor violating decays,
neutrino oscillations, and tau neutrino mass limits.


title:
Measurement of the e+e- -> ZZ production cross-section at centre-of-mass
  energies of 183 and 189GeV

abstract:
  The ee -> ZZ cross section at sqrt(s)=182.7 and 188.6 GeV has been measured
using the ALEPH detector. The analysis covers all of the visible ZZ final
states and yields cross section measurements of sigma_ZZ(182.7 GeV) = 0.11 +-
(0.16,0.11) (stat.) +- 0.04 (syst.) pb and sigma_ZZ(188.6 GeV) = 0.67 +- 0.13
(stat.) +- 0.04 (syst.) pb consistent with the Standard Model expectations.


title: Lambda and Antilambda polarization from deep inelastic muon scattering

abstract:
  We report results of the first measurements of Lambda and Antilambda
polarization produced in deep inelastic polarized muon scattering on the
nucleon. The results are consistent with an expected trend towards positive
polarization with increasing x_F. The polarizations of Lambda and Antilambda
appear to have opposite signs. A large negative polarization for Lambda at low
positive x_F is observed and is not explained by existing models.A possible
interpretation is presented.


title:
Status of Measurements and Interpretation of Total Real and Virtual
  Photon-Proton Cross Sections

abstract:
  The status of measurements and interpretation of the proton structure
function F2 is summarized. The measurements are subjected to DGLAP fits, from
which the gluon density is extracted and a comparison to measurements of F2c is
performed. The longitudinal structure function, FL, is extracted via an
extrapolation of F2. At low Q2, the transition from virtual to real photon
exchange is studied.


title:
Measurement of the trailing edge of cosmic-ray track signals from a
  round-tube drift chamber

abstract:
  The trailing edge of tube drift-chamber signals for charged particles is
expected to provide information concerning the particle passage time. This
information may be useful for separating meaningful signals from overlapping
garbage at high-rate experiments, such as the future LHC experiments. We
carried out a cosmic-ray test using a small tube chamber in order to
investigate the feasibility of this idea. We achieved a trailing-edge time
resolution of 12 ns in rms by applying simple pulse shaping to eliminate a
signal tail. A comparison with a Monte Carlo simulation indicates the
importance of well-optimized signal shaping to achieve good resolution. The
resolution may be further improved with better shaping.


title: Non-compensation of the Barrel Combined Calorimeter Prototype

abstract:
  The e/$\pi$ ratio for the Barrel Combined Calorimeter Prototype, composed
from electromagnetic LAr calorimeter and hadronic Tile calorimter was
investigated. Response of Combined Calorimeter on pions and electrons in the
energy region 20 - 300 GeV was studied. Found $e/h = 1.37\pm0.01\pm0.02$ is in
good agreement with results from previous Combined Calorimeter test but has
more precisions.


title: High Rate Physics at Neutrino Factories

abstract:
  Both muon colliders and non-colliding muon storage rings using muon collider
technology have the potential to become the first true ``neutrino factories'',
with uniquely intense and precisely characterized neutrino beams that could
usher in a new era of high rate and long baseline neutrino physics studies at
accelerators. This paper gives an overview of the predicted capabilities of
neutrino factories for high rate neutrino physics analyses that will use huge
event samples collected with novel, high performance neutrino detectors.


title:
F1 - An Eight Channel Time-to-Digital Converter Chip for High Rate
  Experiments

abstract:
  A new TDC chip has been developed for the COMPASS experiment at CERN. The
resulting ASIC offers an unprecedented degree of flexibility and functionality.
Its capability to handle highest hit and trigger input rates as well as its low
power consumption makes it an ideal tool for future collider and fixed target
experiments. First front-end boards equipped with the F1 chip have been used
recently at testbeam experiments at CERN. A functional description and
specification for this new TDC chip is presented.


title: Jet and hadron production in e+e- annihilations

abstract:
  The DELPHI detector at LEP is particularly suited for hadron identification
and for the identification of b-initiated jets. This note presents recent
results based on such characteristics.


title:
Determination of the QCD color factor ratio CA/CF from the scale
  dependence of multiplicity in three jet events

abstract:
  I examine the determination of the QCD color factor ratio CA/CF from the
scale evolution of particle multiplicity in e+e- three jet events. I fit an
analytic expression for the multiplicity in three jet events to event samples
generated with QCD multihadronic event generators. I demonstrate that a one
parameter fit of CA/CF yields the expected result CA/CF=2.25 in the limit of
asymptotically large energies if energy conservation is included in the
calculation. In contrast, a two parameter fit of CA/CF and a constant offset to
the gluon jet multiplicity, proposed in a recent study, does not yield
CA/CF=2.25 in this limit. I apply the one parameter fit method to recently
published data of the DELPHI experiment at LEP and determine the effective
value of CA/CF from this technique, at the finite energy of the Z0 boson, to be
1.74+-0.03+-0.10, where the first uncertainty is statistical and the second is
systematic.


title: Inclusive Jets at the Tevatron

abstract:
  Results are presented for the inclusive jet cross section versus jet
transverse energy in proton-antiproton collisions at center of mass energy 1.8
TeV as measured by the CDF and D0 detectors at Fermilab's Tevatron collider.
The data are compared to next-to-leading order QCD predictions using different
input parton distribution functions. The ratio of inclusive jet cross sections
at center of mass energy 0.63 TeV and center of mass energy 1.8 TeV, versus jet
x_T, is also presented and compared to QCD predictions.


title:
High Resolution Hybrid Pixel Sensors for the e+e- TESLA Linear Collider
  Vertex Tracker

abstract:
  In order to fully exploit the physics potential of a future high energy e+e-
linear collider, a Vertex Tracker, providing high resolution track
reconstruction, is required. Hybrid Silicon pixel sensors are an attractive
option, for the sensor technology, due to their read-out speed and radiation
hardness, favoured in the high rate environment of the TESLA e+e- linear
collider design but have been so far limited by the achievable single point
space resolution. In this paper, a conceptual design of the TESLA Vertex
Tracker, based on a novel layout of hybrid pixel sensors with interleaved cells
to improve their spatial resolution, is presented.


title: New results on interference effects and correlations

abstract:
  New results on interface effects and correlations are reviewed, including
Fermi-Dirac and Bose-Einstein correlations in hadronic Z0 decays at LEP1.


title: Object oriented data analysis in ALEPH

abstract:
  This article describes the status of the ALPHA^{++} project of the ALEPH
collaboration. The ALEPH data have been converted from Fortran data structures
(BOS banks) into C^{++} objects and stored in a object oriented database
(Objectivity/DB), using tools provided by the RD45 collaboration and the
LHC^{++} software project at CERN. A description of the database setup and of a
preliminary version of an object oriented analysis program is given.


title:
Measurement of the Probability of Gluon Splitting into Charmed Quarks in
  Hadronic Z Decays

abstract:
  We have measured the probability, n(g->cc~), of a gluon splitting into a
charm-quark pair using 1.7 million hadronic Z decays collected by the L3
detector. Two independent methods have been applied to events with a three-jet
topology. One method relies on tagging charmed hadrons by identifying a lepton
in the lowest energy jet. The other method uses a neural network based on
global event shape parameters. Combining both methods, we measure n(g->cc~)=
[2.45 +/- 0.29 +/- 0.53]%.


title:
Measurement of Longitudinal Spin Transfer to Lambda Hyperons in
  Deep-Inelastic Lepton Scattering

abstract:
  Spin transfer in deep-inelastic Lambda electroproduction has been studied
with the HERMES detector using the 27.6 GeV polarized positron beam in the HERA
storage ring. For an average fractional energy transfer <z> = 0.45, the
longitudinal spin transfer from the virtual photon to the Lambda has been
extracted. The spin transfer along the Lambda momentum direction is found to be
0.11 +/- 0.17 (stat) +/- 0.03 (sys); similar values are found for other
possible choices for the longitudinal spin direction of the Lambda. This result
is the most precise value obtained to date from deep-inelastic scattering with
charged lepton beams, and is sensitive to polarized up quark fragmentation to
hyperon states. The experimental result is found to be in general agreement
with various models of the Lambda spin content, and is consistent with the
assumption of helicity conservation in the fragmentation process.


title: Quark and gluon jet properties at LEP

abstract:
  The study of the differences of the fragmentation of quarks and gluons to
jets of hadrons gives insight into the fundamental structure of QCD. Results
from different approaches to properties of quarks and gluons are shown. The
colour factor ratio $C_A/C_F$ is measured in agreement with the QCD prediction.
Identified particles in quark and gluon jets are investigated, revealing no
overproduction of isoscalar $\eta^0$ and $\phi(1020)$ in gluon jets, but an
excess of protons.


title:
A detector for precision study of high energy e+e- annihilations: the
  ECFA/DESY design for TESLA

abstract: The status of the design of a detector for the TESLA collider is presented.


title: Searches for anomalous effects in the b bbar g coupling

abstract:
  The unique SLD CCD vertex detector combined with the highly-polarised
electron beam allow us to search for an anomalous chromomagnetic coupling of
the b-quark, as well as P-odd, T_N-odd and CP-odd processes at the b bbar g
vertex.


title:
Improved Crystal Method for Photon Beam Linear Polarization Measurement
  at High Energies

abstract:
  A method for photon linear polarization determination based on the
measurement of the asymmetry of pairs produced by polarized photons in single
crystals within the optimal intervals of pair particles energies is proposed.
In difference to the well known methods the asymmetry in this case is
essentially larger. The optimal orientation of crystal is found which provides
the maximal values for analyzing power and figure of merit as well as minimal
measurement time.


title:
Search for the glueball candidates f0(1500) and fJ(1710) in gamma gamma
  collisions

abstract:
  Data taken with the ALEPH detector at LEP1 have been used to search for gamma
gamma production of the glueball candidates f0(1500) and fJ(1710) via their
decay to pi+pi-. No signal is observed and upper limits to the product of gamma
gamma width and pi+pi- branching ratio of the f0(1500) and the fJ(1710) have
been measured to be Gamma_(gamma gamma -> f0(1500)). BR(f0(1500)->pi+pi-) <
0.31 keV and Gamma_(gamma gamma -> fJ(1710)). BR(fJ(1710)->pi+pi-) < 0.55 keV
at 95% confidence level.


title: Fragmentation of CDF jets: perturbative or non-perturbative?

abstract:
  Presented are the most recent jet fragmentation results from CDF: inclusive
distributions of charged particle momenta and their kT in jets; average track
multiplicities, as well as angular distributions of multiplicity flow, for a
wide range of jet energies with ET from 40 to 300 GeV. The results are compared
with Monte-Carlo and, when possible, analytical calculations performed in
resummed perturbative QCD approximations (MLLA).


title: Computation of confidence intervals for Poisson processes

abstract:
  We present an algorithm which allows a fast numerical computation of
Feldman-Cousins confidence intervals for Poisson processes, even when the
number of background events is relatively large. This algorithm incorporates an
appropriate treatment of the singularities that arise as a consequence of the
discreteness of the variable.


title: Search for Stimulated Neutrino Conversion with an RF Cavity

abstract:
  Little is known on radiative decays of numu and nutau. Lifetimes can be
constrained, or the process discovered, by a search for flavour conversion in a
superconducting RF cavity installed in a neutrino beam. The lifetimes tested
with such a method can be of interest for astrophysics and cosmology. In
particular the conjecture which explains both the LSND and the SuperKamiokande
signals by radiative decays of numu can be straightforwardly put to the test.


title: CP Violation in K0 Decays

abstract:
  In this lecture, I will review results on the study of direct CP violation-
where the violation occurs in a particle decay rather than in particle-anti
particle mixing. Brief comments on rare decays, particularly those with a CP
reach, will be made. Finally, I will indicate how the community would like to
see the field evolve.


title: Review of B B-bar Mixing Results

abstract:
  A review of B B-bar mixing results at the end of July 1999 is presented.
Emphasis is put on recent measurements of Delta-Md and Delta-Ms. For Delta-Md,
the new world average is Delta-Md = 0.473 +- 0.016 ps-1. For Delta-Ms, the new
world average 95% CL limit is 12.4 ps-1, with a sensitivity of 14.2 ps-1. Other
related results are covered very briefly.


title: Cryogenic calorimeters in astro and particle physics

abstract:
  The development of cryogenic calorimeters was originally motivated by the
fact that very low energy thresholds and excellent energy resolutions can be
achieved by these devices. Cryogenic devices are widely used in double beta
decay experiments, in cosmological dark matter searches, in x-ray detection of
galactic and extragalactic objects as well as in cosmic background radiation
experiments. An overview of the latest developments is given.


title: Tau decays with neutral kaons

abstract:
  The branching ratio of the tau lepton to a neutral K meson is measured from a
sample of approximately 200,000 tau decays recorded by the OPAL detector at
centre-of-mass energies near the Z0 resonance. The measurement is based on two
samples which identify one-prong tau decays with KL and KS mesons. The combined
branching ratios are measured to be B(tau- -->pi- K0bar nutau) =
(9.33+-0.68+-0.49)x10^-3 B(tau- -->pi- K0bar [>=1pi0] nutau) =
(3.24+-0.74+-0.66)x10^-3 B(tau- -->K- K0bar [>=0pi0] nutau) =
(3.30+-0.55+-0.39)x10^-3 where the first error is statistical and the second
systematic.


title:
Inclusive production of D*+- mesons in photon-photon collisions at
  sqrt(s) = 183 and 189 GeV and a first measurement of the the charm structure
  function of the photon

abstract:
  The inclusive production of D*+- mesons in photon-photon collisions has been
measured using the OPAL detector at LEP at e+e- centre-of-mass energies of 183
and 189GeV. The D* mesons are reconstructed in their decay to D0pi+ with the D0
observed in the two decay modes Kpi+ and Kpi+pi-pi+. After background
subtraction, 100.4+-12.6(stat) D*+- mesons have been selected in events without
observed scattered beam electron ("anti-tagged") and 29.8+-5.9 (stat) D*+-
mesons in events where one beam electron is scattered into the detector
("single-tagged"). Direct and single-resolved events are studied separately.
Differential cross-sections as functions of the D* transverse momentum p_t and
pseudorapidity \eta are presented in the kinematic region 2<p_t<12GeV and
\eta<1.5. They are compared to next-to-leading order (NLO) perturbative QCD
calculations. The total cross-section for the process (e+e- to e+e-ccbar),
where the charm quarks are produced in the collision of two quasi-real photons,
is measured to be 842+-97(stat)+-75(syst)+-196(extrapolation)pb. A first
measurement of the charm structure function F2 of the photon is performed in
the kinematic range 0.0014<x<0.87 and 5<Q^2<100 GeV^2, and the result is
compared to a NLO perturbative QCD calculation.


title: CP and T Violation in KL -> pi^+pi^-e^+e^-

abstract:
  I will here make some brief comments on the T- and CP- odd asymmetry observed
by KTeV in the KL -> pi^+pi^-e^+e^- decay.


title: Interpretation of HIGGS and SUSY searches in MSUGRA and GMSB models

abstract:
  HIGGS and SUSY searches performed by the ALEPH Experiment at LEP are
interpreted in the framework of two constrained R-parity conserving models:
Minimal Supergravity and minimal Gauge Mediated Supersymmetry Breaking.


title:
Non-compensation of an Electromagnetic Compartment of a Combined
  Calorimeter

abstract:
  The method of extraction of the $e/h$ ratio, the degree of non-compensation,
of the electromagnetic compartment of the combined calorimeter is suggested.
The $e/h$ ratio of $1.74\pm0.04$ has been determined on the basis of the 1996
combined calorimeter test beam data. This value agrees with the prediction that
$e/h > 1.7$ for this electromagnetic calorimeter.


title: Charm Overview

abstract:
  This paper is aimed at giving a complete review of the latest (post-1998
Physics in Collision conference) experimental results on charm physics.


title: Should ${\bar p}p\to{\bar\Lambda}\Lambda$ be revived?

abstract:
  The continued interest of CP violation in hyperon decay (as well as many
other physics topics that could be addressed by such a facility) suggests that
a dedicated $\bar p$ storage ring at Fermilab ought to be reconsidered. With
recent and anticipated technical progress, sensitivity many orders of magnitude
beyond that achieved in LEAR may be possible, including 10^{-5} sensitivity for
the $\Lambda/{\bar\Lambda}$ CP-asymmetry parameter $A_\Lambda$.


title: New measurement of the rare decay $\phi \to \eta' \gamma$ with CMD-2

abstract:
  A new measurement of the rare decay \phi \to \eta' \gamma performed with the
CMD-2 detector at Novosibirsk is described. Of the data sample corresponding to
the integrated luminosity of 14.5 pb^{-1}, twenty one events have been selected
in the mode \eta'\to\pi^+\pi^-\eta, \eta\to\gamma\gamma. The following
branching ratio was obtained: B(\phi \to \eta' \gamma) = (8.2^{+2.1}_{-1.9} \pm
1.1) 10^{-5}.


title: Searches for Exotics at HERA

abstract:
  Searches for contact interactions, leptoquark bosons and excited fermions
carried out at the HERA ep collider are presented here. The searches are based
on ~ 40 pb^-1 of e+ p data per experiment collected at a centre of mass energy
~ 300 GeV. First results on e- p data collected in 1998-1999 are also
presented.


title:
A study of the etapipi channel produced in central pp interactions at
  450 GeV/c

abstract:
  The reaction pp -> pf (eta pi pi) ps has been studied at 450 GeV/c. There is
clear evidence for an a2(1320)pi decay mode of the eta2(1645) and eta2(1870).
In addition, there is evidence for an a0(980)pi$ decay mode of both resonances
and an f2(1270)eta decay mode of the eta2(1870). No evidence is found for a JPC
= 2++ a2(1320)pi wave.


title:
The Vertex Tracker at the e+e- Linear Collider Conceptual Design,
  Detector R&D and Physics Performances for the Next Generation of Silicon
  Vertex Detectors

abstract:
  The e+e- linear collider physics programme sets highly demanding requirements
on the accurate determination of charged particle trajectories close to their
production point. A new generation of Vertex Trackers, based on different
technologies of high resolution silicon sensors, is being developed to provide
the needed performances. These developments are based on the experience with
the LEP/SLC vertex detectors and on the results of the R&D programs for the LHC
trackers and also define a further program of R&D specific to the linear
collider applications. In this paper the present status of the conceptual
tracker design, silicon detector R&D and physics studies is discussed.


title: Electroweak Precision Measurements with Leptons

abstract:
  The precision measurements of lepton electroweak parameters at SLD and LEP
are reviewed and discussed. The updated SLD weak mixing angle measurement from
$A_{LR}$ and the lepton left-right forward-backward asymmetries is
$\sin^2\theta_W^{eff} = 0.23099 \pm 0.00026$, and the combined SLD/LEP
lepton-based value is $0.23119 \pm 0.00020$. This value differs by over
$3\sigma$ from the comparable quark-based value.


title:
A study of the eta etaprime and etaprime etaprime channels produced in
  central pp interactions at 450 GeV/c

abstract:
  The reactions pp -> pf (X0) ps, where X0 is observed decaying to eta etaprime
and etaprime etaprime, have been studied at 450 GeV/c. This is the first time
that these channels have been observed in central production and only the
second time that the etaprime etaprime channel has been observed in any
production mechanism. In the eta etaprime channel there is evidence for the
f0(1500) and a peak at 1.95 GeV. The etaprime etaprime channel shows a peak at
threshold which is compatible with having JPC = 2++ and spin projection JZ = 0.


title: A proposal for a different chi-square function for Poisson distributions

abstract:
  We obtain an approximate Gaussian distribution from a Poisson distribution
after doing a change of variable. A new chi-square function is obtained which
can be used for parameter estimations and goodness-of-fit testing when
adjusting curves to histograms. Since the new distribution is approximately
Gaussian we can use it even when the bin contents are small. The corresponding
chi-square function can be used for curve fitting. This chi-square function is
simple to implement and presents a fast convergence of the parameters to the
correct value, especially for the parameters associated with the width of the
fitted curve. We present a Monte Carlo comparative study of the fitting method
introduced here and two other methods for three types of curves: Gaussian,
Breit-Wigner and Moyal, when each bin content obeys a Poisson distribution. It
is also shown that the new method and the other two converge to the same result
when the number of events increases


title:
About testing nu_mu oscillation with Dm2 smaller than 0.001 eV2 with the
  CERN Proton Synchrotron

abstract:
  We study the feasibility of a long baseline neutrino experiment from CERN to
Gran Sasso LNGS Laboratories using the CERN PS accelerator. Baseline and
neutrino energy spectrum are suitable to explore a region of the (Dm2,
Sin2(theta)) parameters space which is not reached by K2K, the first experiment
that will test at accelerator the atmospheric neutrino anomaly put in evidence
by SuperKamiokande.


title: Spectroscopy of excited b and c states

abstract:
  Recent results on the spectroscopy of excited b and c states are presented.
In particular, these include the first observation of the D_1 (light quark spin
j=1/2) resonance, searches for radially excited D*' and observations of
orbitally excited B*_J states. The current experimental status on excited
charmed baryons is also briefly reviewed.


title: Electroweak Physics, Experimental Aspects

abstract:
  Collider measurements on electroweak physics are summarised. Although the
precision on some observables is very high, no deviation from the Standard
Model of electroweak interactions is observed. The data allow to set stringent
limits on some models for new physics.


title: MLLA Parton Spectra Compared to ARIADNE

abstract:
  The parton spectra as predicted by the ARIADNE Monte Carlo generator, for
both e+e- annihilation and deep inelastic scattering, are compared to the QCD
MLLA calculations.


title: Event Shapes and Forward Jet Production at HERA

abstract:
  Analyses of event shapes and forward jet production in deep inelastic
scattering at the HERA collider are described. The results are compared to QCD
predictions.


title: Analysis of trap spectra in LEC and epitaxial GaAs

abstract:
  Different methods of trap parameter measurement are analysed. Transient
photoconductivity and thermally stimulated effects were used to investigate the
influence of traps in LEC SI-GaAs and high resistivity epitaxial GaAs. The
peculiarities of the TSC were analysed and shown to be related to the influence
of crystal micro-inhomogeneities.


title: Structure of Real and Virtual Photons from ZEUS

abstract:
  Measurements sensitive to the structure of both real and virtual photons are
presented and compared to theoretical models with various photon parton
distribution functions (PDFs). Measurements for real photons show a tendency
for the available photon PDFs to be too small to describe the data. For virtual
photons, the photon PDF is seen to decrease with increasing photon virtuality.
In order to describe the data, resolved photon processes are required up to a
photon virtuality of at least 4.5 GeV^2.


title:
Comparison of Dijet Cross Sections vs Q^2 with Various Monte Carlo
  Models

abstract:
  The dijet cross section as a function of both the fraction of the photon
momentum participating in the hard process, x_\gamma^{OBS}, and the photon's
virtuality, Q^2, is compared with the predictions of Herwig 5.9 for various
photon parton distribution functions. The ratio of dijet cross sections with
x_\gamma^{OBS} < 0.75 and x_\gamma^{OBS} > 0.75 is measured as a function of
Q^2. This ratio is found to decrease as Q^2 increases consistent with the
hypothesis that the photon parton distribution functions decrease with
increasing photon virtuality.


title: Prompt photon processes in photoproduction at HERA

abstract:
  We present results for the photoproduction of inclusive prompt photons and
for prompt photons accompanied by jets, measured with the ZEUS detector at
HERA. Cross sections as a function of pseudorapidity and transverse energy are
presented for 5 < E_T^\gamma < 10 GeV, E_T^{jet} > 5 GeV in the centre of mass
energy range 120-270 GeV. Comparisons are made with predictions from leading
logarithm parton shower Monte Carlos and next-to-leading order QCD calculations
using currently available models of the photon structure. NLO QCD calculations
describe the shape and magnitude of the measurements reasonably well.


title:
The analysis of pi^{-} mesons produced in nucleus-nucleus collisions at
  a momentum of 4.5 GeV/c/nucleon in light front variables

abstract:
  The light front analysis of pi^{-} mesons in He(Li,C), C-Ne, C-Cu and O-Pb
collisions is carried out. The phase space of secondary pions is divided into
two parts in one of which the thermal equilibrium assumption seems to be in a
good agreement with the data. Corresponding temperatures T are extracted and
their dependence on (A_{P}*A_{T})^{1/2} is studied. The results are compared
with the predictions of the Quark-Gluon String Model (QGSM). The QGSM
satisfactorily reproduces the experimental data for light and intermediate-mass
nuclei.


title:
Comment on ``Parton distributions, d/u, and higher twist effects at high
  x''

abstract:
  In a recent paper Yang and Bodek extracted the free neutron structure
function at large x by extrapolating the density dependence of the nuclear EMC
ratios to the deuteron. We clarify why this approach is ill-defined for light
nuclei, and introduces a large theoretical bias into the extraction of F_2n at
large x.


title: The measurement of sin(2beta)

abstract:
  Since the first observation in 1964, CP violation remains one of the most
elusive aspects of the standard model. The CDF collaboration has reported the
first evidence of CP violation in the B system using the world's largest sample
of $B \to J/\psi K^0_S $ decays. The direct measurement of
sin$(2\beta)$=0.79$^{+0.41}_{-0.44}$ (combined statistical and systematic
error) agrees with the standard model predictions. New data collected from the
B-factories and from the upgraded experiments at the Tevatron should allow a
more precise measurement of $\sin 2\beta$ in the near future.


title: Multidimensional Resonance Analysis of $\Lambda_c^+ \to pK^-\pi^+$

abstract:
  We present the results of a five-dimensional resonant amplitude analysis of
the $\Lambda_c^+{\to}pK^{-}\pi^{+}$ system based on $946\pm 38$ reconstructed
decays. These data were produced in 500 GeV/$c$ $\pi^-$-N interactions by
Fermilab experiment E791. We report measurements of the amplitudes for
$\Lambda_c^+$ decay into nonresonant $pK^-\pi^+$ and to $p\bar{K}^{*0}(890)$,
$\Delta^{++}(1232)K^-$, and $\Lambda(1520)\pi^+$ and we comment on other
possible resonant enhancements. This is the first complete amplitude analysis
of the $\Lambda_c^{+}{\to}pK^{-}\pi^{+}$ system. We find that
$(54.8\pm5.5\pm3.5)$% of the decays are nonresonant, $(19.5\pm2.6\pm1.8)$% of
the decays are via the $\bar{K}^{*0}$ resonance, $(18.0\pm2.9\pm2.9)$% of the
decays are via the $\Delta^{++}$ resonance, and $(7.7\pm1.8\pm1.1)$% of the
decays are via the $\Lambda(1520)$ resonance. We find evidence for an
increasingly negative polarization of the $\Lambda_c^+$ baryons as a function
of $p_T^2$, in agreement with a recent model\cite{dha} and with a related
measurement\cite{jez}.


title: Status of KEKB accelerator and detector, BELLE

abstract:
  Status of the KEKB accelerator and the detector, BELLE, is reported. The
construction of the 3.5 Gev x 8 GeV electron-positron collider, and the
solenoid detector, BELLE, was completed in December, 1998. The commissioning of
them has been made since then. The BELLE detector has observed the first
hadronic event from the beam collision on Jun 1, 1999. The achieved maximum
luminosity by August 4th, 1999, was 3 x 10^32 cm^-2 sec^-1. The KEKB operation
will be continued after two months of summer break.


title:
A spin analysis of the 4pi channels produced in central pp interactions
  at 450 GeV/c

abstract:
  The reactions pp -> pf (X0) ps, where X0 is observed decaying to
pi0pi0pi0pi0, pi+pi-pi0pi0 and pi+pi-pi+pi-, have been studied at 450 GeV/c.
There is evidence for an a2(1320)pi decay mode of the eta2(1645) and eta2(1870)
in the pi+pi-pi0pi0 and pi+pi-pi+pi- final states. The f2(1950) is consistent
with being a single resonance with a dominant f2(1270)pipi decay mode. The
f0(1370) is found to decay dominantly to rho-rho while the f0(1500) is found to
decay to rho-rho and sigma-sigma.


title: Recent Psi(2S) Results at BES

abstract:
  Based on $(3.79\pm0.31)\times10^6 ~\psi'$ data sets collected with the BES
detector at BEPC, the recent $\psi'$, $\chi_{cJ}$ and $\eta_c$ results from BES
are presented. Some results are compared with NRQCD.


title: Atmospheric Neutrinos and the Oscillations Bonanza

abstract:
  New observations with atmospheric neutrinos from the underground experiments
SuperKamiokande, Soudan 2, and MACRO, together with earlier results from
Kamiokande and IMB, are reviewed. The most recent observations reconfirm
aspects of atmospheric flavor content and of zenith angle distributions which
appear anomalous in the context of null oscillations. The anomalous trends,
exhibited with high statistics in both sub-GeV and multi-GeV data of the
SuperKamiokande water Cherenkov experiment, occur also in event samples
recorded by the tracking calorimeters. The data are well-described by
disappearence of nu_mu flavor neutrinos arising in oscillations with dominant
two-state mixing, for which there exists a parameter region allowed by all
experiments. In a new analysis by SuperKamiokande, nu_mu -> nu_tau is favored
over nu_mu -> nu_s as the dominant oscillation based upon absence of
oscillation suppression from matter effects at high energies. The possibility
for sub-dominant nu_mu -> nu_e oscillations in atmospheric neutrinos which
arises with three-flavor mixing, is reviewed, and intriguing possibilities for
amplification of this oscillation by terrestrial matter-induced resonances are
discussed. Developments and future measurements which will enhance our
knowledge of the atmospheric neutrino fluxes are briefly noted.


title: Charged particle production in the Pb+Pb system at 158 GeV/c per nucleon

abstract:
  Charged particle multiplicities from high multiplicity central interactions
of 158 GeV/nucleon Pb ions with Pb target nuclei have been measured in the
central and far forward projectile spectator regions using emulsion chambers.
Multiplicities are significantly lower than predicted by Monte Carlo
simulations. We examine the shape of the pseudorapidity distribution and its
dependence on centrality in detail.


title: Tests of Perturbative QCD and Jet Physics

abstract:
  I describe the current status of tests of perturbative QCD, using
measurements of jet, photon, weak boson and heavy flavor production from the
Tevatron, LEP and HERA. Measurements of the strong coupling constant are
described, and I conclude with a "wish list" for the future.


title: Accelerator and Reactor Neutrino Experiments

abstract:
  Present results from neutrino experiments at accelerators and nuclear
reactors are reviewed with emphasis on neutrino oscillation searches. Future
prospects in this field are also discussed.


title: Recent Results from CDF

abstract:
  We present the latest results from the CDF experiment at the Tevatron
Collider in \ppbar collisions at $\sqrt{s} = 1.8$ TeV. The large data sample
collected during Run 1, from 1992 until 1995, allows measurements in many
domains of high-energy physics. Here, we report on the first measurement of
$\sin(2\beta)$, a CP violation parameter, and on an improved measurement of the
top quark cross section. We also report on searches for the so-far elusive
Higgs boson, and for SUSY, through searches for direct production of top and
bottom scalar quarks. Finally, we outline the prospects for the physics during
the upcoming Run 2, ready to start in the upcoming year 2000.


title: HERA-B: Physics Potential and Prospects

abstract:
  HERA-B is a hadroproduction experiment located at DESY in Hamburg, Germany.
The experiment produces B mesons and baryons by inserting thin wire targets
into the halo of the proton beam circulating in the HERA storage ring. The B
decays are studied to search for evidence of CP violation and constrain the
angle $\beta$ and possibly $\gamma$ and $\alpha$ of the CKM unitarity triangle.
The experiment also produces B_s mesons; these decays are studied to measure or
constrain the mass difference $\Delta m_s$ and width difference
$\Delta\Gamma_s$ between the two $B^0_s/\bar{B}_s^0$ mass eigenstates. Finally,
the large number of B's produced allows HERA-B to search for rare and forbidden
decays such as $B\to K^{(*)}\ell^+_1\ell^-_2$. The experiment is scheduled to
begin running in early 2000.


title:
Search for the Charged Higgs Boson in the Decays of Top Quark Pairs in
  the $e\tau$ and $\mu\tau$ Channels at $\sqrt{s}$=1.8 TeV

abstract:
  Top quark production offers the unique opportunity to search for a charged
Higgs boson ($H^\pm$), as the contribution from $t\to H^+b\to \tau^+\nu b$ can
be large in extensions of the Standard Model. We use results from a search for
top quark pair production by the Collider Detector at Fermilab (CDF) in the
e$\tau + \ebar_T$+jets and $\mu\tau +\ebar_T$+jets signatures to set an upper
limit on the branching ratio of ${\cal B} (t \to H^{+} b)$ in 106 pb$^{-1}$ of
data. The upper limit is in the range 0.5 to 0.6 at 95% C.L. for $H^{+}$ masses
in the range 60 to 160 GeV, assuming the branching ratio for {$H^+\to \tau
\nu$} is 100% . The $\tau$ lepton is detected through its 1-prong and 3-prong
hadronic decays.


title: The e/h Method of Energy Reconstruction for Combined Calorimeter

abstract:
  The new simple method of the energy reconstruction for a combined
calorimeter, which we called the e/h method, is suggested. It uses only the
known e/h ratios and the electron calibration constants and does not require
the determination of any parameters by a minimization technique. The method has
been tested on the basis of the 1996 test beam data of the combined calorimeter
and demonstrated the correctness of the reconstruction of the mean values of
energies. The obtained fractional energy resolution is
$[(58\pm3)%/\sqrt{E}+(2.5\pm0.3)%]\oplus (1.7\pm0.2)/E$. This algorithm can be
used for the fast energy reconstruction in the first level trigger.


title:
The lower mass limit on the lightest supersymmetric particle, using
  ALEPH data up to 188.6GeV

abstract:
  The lightest srpersymmetric particle (LSP) is expected to be stable, massive
and neutral. Direct searches for supersymmetric particles in the context of the
minimal supersymmetric extension to the standard model have been performed with
the ALEPH detector. Using about 175pb-1 of data with centre-of-mass energies
near 189GeV a limit on the mass of the LSP of M_LSP>32.3GeV/c2 at 95%
confidence can be derived, assuming R-parity is conserved.


title: Charm Mixing and Rare Decays

abstract:
  There has been significant recent experimental activity on the related topics
of charm mixing and rare (flavor changing neutral current) decay. For mixing,
several new results from direct (wrong sign) searches and first results from
lifetime difference (Delta Gamma) searches have been reported. Limits for r_mix
of approximately 5 x 10^{-4} (or better) are possible from work in progress.
For rare decays, sensitivities to branching ratios are now at the level of a
few x 10^{-6}.


title:
The Isolated Photon Cross Section in p pbar Collisions at sqrt(s) = 1.8
  TeV

abstract:
  We report a new measurement of the cross section for the production of
isolated photons, with transverse energies (ET) above 10 GeV and
pseudorapidities |eta| < 2.5, in p pbar collisions at sqrt{s} = 1.8 TeV. The
results are based on a data sample of 107.6 pb-1 recorded during 1992--1995
with the D0 detector at the Fermilab Tevatron collider. The background,
predominantly from jets which fragment to neutral mesons, was estimated using
the longitudinal shower shape of photon candidates in the calorimeter. The
measured cross section is in good agreement with the next-to-leading order
(NLO) QCD calculation for ET > 36 GeV.


title: Search for Scalar Top Quark Production in p-pbar Collisions at 1.8 TeV

abstract:
  We have searched for direct production of scalar top quarks at the Collider
Detector at Fermilab in 88 pb-1 of p anti-p collisions at s**(1/2) = 1.8 TeV.
We assume the scalar top quark decays into either a bottom quark and a chargino
or a bottom quark, a lepton, and a scalar neutrino. The event signature for
both decay scenarios is a lepton, missing transverse energy, and at least two
b-quark jets. For a chargino mass of 90 GeV/c2 and scalar neutrino masses of at
least 40 GeV/c2, we find no evidence for scalar top production and present
upper limits on the production cross section in both decay scenarios.


title: Precise Electroweak Results from LEP2

abstract: Precise electroweak results from LEP2 are reviewed.


title:
Cross section of the reaction $e^+ e^- \to \pi^+\pi^-\pi^+\pi^- $ below
  1 GeV at CMD-2

abstract:
  Using 3.07 ${pb}^{-1}$ of data collected in the energy range 0.60-0.97 GeV by
CMD-2, about 150 events of the process $\epm \to \pch$ have been selected. The
energy dependence of the cross section agrees with the assumption of the
$a_1(1260) \pi$ intermediate state which is dominant above 1 GeV. For the first
time \fourpi events are observed at the $\rho$ meson energy. Under the
assumption that all these events come from the $\rho$ meson decay, the value of
the cross section at the $\rho$ meson peak corresponds to the following decay
width:
  \Gamma(\rho^0 \to \fourpi) = (2.8 \pm 1.4 \pm 0.5) {keV} or to the branching
ratio
  B(\rho^0 \to \fourpi) = (1.8 \pm 0.9 \pm 0.3) \cdot 10 ^{-5}.


title: Review of Charm Lifetimes

abstract:
  A review of the latest experimental results on charm particle lifetimes is
presented. The most significant update is that the D_s^+ lifetime is
conclusively larger than the D^0 lifetime and signifies that
W-exchange/W-annihilation contributions are large. Using new high statistics
data on $D^+\to K^+\pi^+\pi^-$ together with the D_s^+ lifetime and some
assumptions, one can phenomenologically extract the strength of the W-exchange
contribution in D^0 decays and of W-annihilation in D_s^+ decays. These are
larger than or at the limit of theoretical expectations using QCD-based
operator production expansion techniques.


title:
A Measurement of the Differential Dijet Mass Cross Section in p-pbar
  Collisions at sqrt{s}=1.8 TeV

abstract:
  We present a measurement of the cross section for production of two or more
jets as a function of dijet mass, based on an integrated luminosity of 86 pb^-1
collected with the Collider Detector at Fermilab. Our dijet mass spectrum is
described within errors by next-to-leading order QCD predictions using CTEQ4HJ
parton distributions, and is in good agreement with a similar measurement from
the D0 experiment.


title:
Limits on Quark Compositeness from High Energy Jets in PbarP Collisions
  at 1.8 TeV

abstract:
  Events in PbarP collisions at sqrt(s)=1.8 TeV with total transverse energy
exceeding 500 GeV are used to set limits on quark substructure. The data are
consistent with next-to-leading order QCD calculations. We set a lower limit of
2.0 TeV at 95% confidence on the energy scale Lambda_LL for compositeness in
quarks, assuming a model with a left-left isoscalar contact interaction term.
The limits on Lambda_LL are found to be insensitive to the sign of the
interference term in the Lagrangian.


title: dEdx Particle Identification for Collider Detectors

abstract:
  We review some basic features of dE/dx particle identification that are
relevant to high energy physics tracking devices. Gas-based drift chambers as
well as silicon trackers are discussed.


title: Precision Measurements of Particle Masses using Jets at LEP2

abstract:
  How massive elementary particles get their mass is one of the greatest open
questions in physics. Two of the major goals of the current LEP2 physics
program that help to address this question are (a) to measure as precisely as
possible the W Boson mass mW and (b) to exclude or discover the Higgs Boson
within the available kinematic region. The reconstruction of invariant masses
with jets from 4-jet channels (e.g. WW -> q qbar q qbar and HZ -> b bbar q
qbar) and missing energy channels (e.g WW -> e nu q qbar and e+e- -> H nu
nubar) is discussed. The emphasis is on the determination of mW, from which the
role of calorimetry in such a precision measurement is emphasised.


title: Precision Electroweak Physics at the Z

abstract:
  A review of the decade of Z-pole electroweak physics is presented. Although
all experimental work has been completed, it represents a ``Golden Age'' in our
understanding of the Minimal Electroweak Standard Model (MSM). The latest (and
nearly final) results from the LEP and SLC experiments are presented. The
remaining inconsistencies are discussed and and their effects upon the MSM
interpretation are explored.


title: Hard Photoproduction and the Structure of the Photon

abstract:
  A pedagogical introduction to the experimental results on hard
photoproduction at HERA is provided. Then the latest results in this field from
ZEUS and H1 are reviewed.


title: Longitudinal Hadronic Shower Development in a Combined Calorimeter

abstract:
  This work is devoted to the experimental study of the longitudinal hadronic
shower development in the ATLAS barrel combined prototype calorimeter
consisting of the lead-liquid argon electromagnetic part and the
iron-scintillator hadronic part. The results have been obtained on the basis of
the 1996 combined test beam data which have been taken on the H8 beam of the
CERN SPS, with the pion beams of 10, 20, 40, 50, 80, 100, 150 and 300 GeV/c.
The degree of description of generally accepted Bock parameterization of the
longitudinal shower development has been investigated. It is shown that this
parameterization does not give satisfactory description for this combined
calorimeter. Some modification of this parameterization, in which the e/h
ratios of the compartments of the combined calorimeter are used, is suggested
and compared with the experimental data. The agreement between such
parameterization and the experimental data is demonstrated.


title: Detection of Pionium with DIRAC

abstract:
  The aim of the DIRAC experiment at CERN is to provide an accurate
determination of S-wave pion-pion scattering lengths from the measurement of
the lifetime of the pi+ pi- atom. The measurement will be done with precision
comparable to the level of accuracy of theoretical predictions, formulated in
the context of Chiral Perturbation Theory. Therefore, the understanding of
chiral symmetry breaking of QCD will be submitted to a stringent test.


title: Structure of the Photon

abstract:
  An overview of the current data and phenomenology on the structure of the
photon and an outline of some opportunities available in the medium term
future.


title: Electroweak Measurements from Hadron Machines

abstract:
  A review of recent electroweak results from hadron machines including the
measurements of the top quark and W boson mass.


title:
Probing BFKL Dynamics in the Dijet Cross Section at Large Rapidity
  Intervals in ppbar Collisions at sqrt{s}=1800 and 630 GeV

abstract:
  Inclusive dijet production at large pseudorapidity intervals (delta_eta)
between the two jets has been suggested as a regime for observing BFKL
dynamics. We have measured the dijet cross section for large delta_eta in ppbar
collisions at sqrt{s}=1800 and 630 GeV using the DO detector. The partonic
cross section increases strongly with the size of delta_eta. The observed
growth is even stronger than expected on the basis of BFKL resummation in the
leading logarithmic approximation. The growth of the partonic cross section can
be accommodated with an effective BFKL intercept of
a_{BFKL}(20GeV)=1.65+/-0.07.


title:
Limits on Anomalous WWgamma and WWZ Couplings from WW/WZ->enujj
  Production

abstract:
  Limits on anomalous WWgamma and WWZ couplings are presented from a study of
WW/WZ->enujj events in ppbar collisions at sqrt{s}=1.8 TeV. Results from the
analysis of data collected using the D0 detector during the 1993-1995 Tevatron
collider run at Fermilab are combined with those of an earlier study from the
1992-1993 run. A fit to the transverse momentum spectrum of the W boson yields
direct limits on anomalous WWgamma and WWZ couplings. With the assumption that
the WWgamma and WWZ couplings are equal, we obtain -0.34< lambda < 0.36 (with
Delta kappa=0) and -0.43< Delta kappa < 0.59 (with lambda=0) at the 95
confidence level for a form-factor scale Lambda=2.0 TeV.


title: Semileptonic B Decays from CLEO

abstract:
  I report results in semileptonic decays of B mesons from the CLEO
collaboration, with a focus on recent results. Results for exclusive
reconstruction of B -> D* l nu, B -> D l nu and B -> rho l nu are given
including the q^2 dependence of the form factors. These results are used to
measure |V_cb| and |V_ub|. Two preliminary analyses using inclusive techniques
measure the lepton momentum spectrum and hadronic recoil mass spectrum in B ->
X_c l nu decays, showing promise for future precision measurements of |V_cb|.


title:
Study of collective matter flow in central C-Ne and C-Cu collisions at
  energy of 3.7 GeV per nucleon

abstract:
  The transverse momentum technique is used to analyse charged-particle
exclusive data in the central C-Ne and C-Cu interactions at energy of 3.7 Gev
per nucleon. The clear evidence of in-plane and out-of-plane (squeeze-out) flow
effects for protons and $\pi^{-}$ mesons have been obtained. In C-Ne
interactions the $\pi^{-}$ mesons in-plane flow is in the same direction to the
protons, while in C-Cu collisions pions show antiflow behaviour. From the
transverse momentum and azimuthal distributions of protons and pi^{-} mesons
with respect to the reaction plane the flow F (the measure of the amount of
collective transverse momentum transfer in the reaction plane) and the
parameter a_{2} (the measure of the strength of the anisotropic emission) have
been extracted. The flow effects increase with the mass of the particle and
atomic number of target A_{T}. The comparison of our in-plane flow results with
flow data of various projectile/target configurations had been done by a scaled
flow F_{S}=F/(A_{P}^{1/3}+A_{T}^{1/3}). F_{S} demonstrates a common scaling
behaviour among flow values from different systems.


title: Experimental Techniques

abstract:
  In this course we will give examples for experimental techniques used in
particle physics experiments. After a short introduction, we will discuss
applications in silicon microstrip detectors, wire chambers, and single photon
detection in Ring Imaging Cherenkov (RICH) counters. A short discussion of the
relevant physics processes, mainly different forms of energy loss in matter, is
enclosed.


title: HERA-B Status

abstract:
  The HERA-B experiment is designed for studying aspects of B-physics at DESY's
HERA proton-electron storage ring, with emphasis on CP violation, particularly
in the B->J/psi Kzero decay channel. The apparatus is nearing completion and
the triggering system is being commissioned. A brief description of HERA-B is
given and its present status is summarized.


title: Heavy Quark Lifetimes, Mixing and CP Violation

abstract:
  This paper emphasizes four topics that represent some of the year's
highlights in heavy quark physics. First of all, a review is given of charm
lifetime measurements and how they lead to better understanding of the
mechanisms of charm decay. Secondly, the CLEO collaboration's new search for
charm mixing is reported, which significantly extends the search for new
physics in that sector. Thirdly, important updates in Bs mixing are summarized,
which result in a new limit on the mass difference, and which further constrain
the unitarity triangle. Finally, the first efforts to measure CP violation in
the B system are discussed. Results are shown for the CDF and ALEPH
measurements of sin(2beta), as well as the CLEO branching fraction measurements
of B-->Kpi,pipi, which have implications for future measurements of alpha.


title:
Particle - antiparticle asymmetries in the production of baryons in 500
  GeV/c pi^- Nucleon interactions

abstract:
  We present the Fermilab E791 measurement of baryon - antibaryon asymmetries
in the production of Lambda^0, Cascade, Omega and Lambda_c in 500 GeV/c pi^-
Nucleon interactions. Asymmetries have been measured as a function of x_F and
p_T**2 over the range -0.12 < x_F < 0.12 and p_T**2 < 4$ (GeV/c)**2 for
hyperons and -0.1 < x_F < 0.3 and p_T**2 < 8 (GeV/c)**2 for the Lambda_c
baryons. We observe clear evidence of leading particle effects and a basic
asymmetry even at x_F=0. These are the first high statistics measurements of
the asymmetry in both the target and beam fragmentation regions in a fixed
target experiment.


title: The Spin Structure of the Nucleon

abstract:
  The present status of the nucleon's spin structure is reviewed with emphasis
on new experimental results.


title:
Higgs mass determination from direct reconstruction at a Linear e=e-
  Collider

abstract:
  We study the feasibility of a precise measurement of the mass of a 120 GeV
MSM Higgs boson through direct reconstruction of ZH->qqH events that would be
achieved in a future e+e- linear collider operating at a center-of-mass energy
of 500 GeV. Much effort has been put in a ``realistic simulation'' by including
irreducible and reducible backgrounds, realistic detector effects and
reconstruction procedures and sophisticated analysis tools involving Neural
Networks and kinematical fitting. As a result, the Higgs mass is determined
with a statistical accuracy of 50 MeV and the Z-Higgs Yukawa coupling measured
to 0.7%, assuming 500 fb^-1 of integrated luminosity.


title: Results on direct CP violation from NA48

abstract:
  A report on the recent measurement of epsilon-prime, which characterises
direct CP violation in the neutral kaon system, by the NA48 collaboration.


title: Recent Results and Perspectives at CDF and D0

abstract:
  Over the course of the past years the experimental measurements performed by
the two large collaborations, CDF and D{\O}, at the
  Fermilab Tevatron Collider have fueled advances in our understanding of
physics at the energy frontier. At the present time the accelerator complex and
the two detectors are undergoing substantial improvements. In this paper, we
provide a discussion of some recent results which in turn provides a framework
within which we can look to future prospects.


title: Hadronic \tau decays and QCD

abstract:
  Hadronic decays of the $\tau$ lepton provide a clean source to study hadron
dynamics in an energy regime dominated by resonances, with the interesting
information captured in the spectral functions. Recent results on exclusive
channels are reviewed. Inclusive spectral functions are the basis for QCD
analyses, delivering an accurate determination of the strong coupling constant
and quantitative information on nonperturbative contributions. Strange decays
yield a determination of the strange quark mass.


title:
The ZEUS Forward Plug Calorimeter with Lead-Scintillator Plates and WLS
  Fiber Readout

abstract:
  A Forward Plug Calorimeter (FPC) for the ZEUS detector at HERA has been built
as a shashlik lead-scintillator calorimeter with wave length shifter fiber
readout. Before installation it was tested and calibrated using the X5 test
beam facility of the SPS accelerator at CERN. Electron, muon and pion beams in
the momentum range of 10 to 100 GeV/c were used. Results of these measurements
are presented as well as a calibration monitoring system based on a $^{60}$Co
source.


title: Today and Future Neutrino Experiments at Krasnoyarsk Nuclear Reactor

abstract:
  The results of undergoing experiments and new experiment propositions at
Krasnoyarsk underground nuclear reactor are presented


title: Antineutrino-Deuteron Experiment at Krasnoyrsk

abstract:
  This report is represented the results of some experiments, which carried out
at the neutrino underground laboratory of Kranoyarsk nuclear plant.


title: A stronger classical definition of Confidence Limits

abstract:
  A novel way of defining limits in classical statistics is proposed. This is a
natural extension of the original Neyman's method, and has the desirable
property that only information relevant to the problem is used in making
statistical inferences. The result is a strong restriction on the allowed
confidence bands, excluding in full generality pathologies as empty confidence
regions or unstable solutions. The method is completely general and directly
applicable to all problems of limits.


title: The Photon Structure from Deep Inelastic Electron-Photon Scattering

abstract:
  The present knowledge of the structure of the photon is presented with
emphasis on measurements of the photon structure obtained from deep inelastic
electron-photon scattering at e+e- colliders. This review covers the leptonic
and hadronic structure of quasi-real and also of highly virtual photons, based
on measurements of structure functions and differential cross-sections. Future
prospects of the investigation of the photon structure in view of the ongoing
LEP2 programme and of a possible linear collider are addressed. The most
relevant results in the context of measurements of the photon structure from
photon-photon scattering at LEP and from photon-proton and electron-proton
scattering at HERA are summarised.


title: Search for Neutrino Oscillations at the Palo Verde Nuclear Reactors

abstract:
  We report on the initial results from a measurement of the anti-neutrino flux
and spectrum at a distance of about 800 m from the three reactors of the Palo
Verde Nuclear Generating Station using a segmented gadolinium-loaded
scintillation detector. We find that the anti-neutrino flux agrees with that
predicted in the absence of oscillations to better than 5%, excluding at 90% CL
$\rm\bar\nu_e - \bar\nu_x$ oscillations with $\Delta m^2 > 1.12\times 10^{-3}$
eV^2 for maximal mixing and $\sin^2{2\theta} > 0.21$ for large $\Delta m^2$.


title: Determination of alpha_S at 500 GeV from Event Shapes and Jet Rates

abstract:
  The potential of the TESLA linear e+e- collider to determine the strong
coupling constant, alpha_S, at 500 GeV is investigated. Experimental
complications due to background from W- and Z-pairs, top-production, initial
state photon radiation and from beamstrahlung are considered. The hadronic
event selection procedures used by the experiments at LEP II are reviewed for
the applicability at TESLA. An estimate of the various error contributions to
the total uncertainty of an $\alpha_S$ determination is presented. It confirms
that hadronisation effects are diminished while the uncertainty from the choice
of the renormalisation scale will dominate. Fits of the ln(R)-matched second
order (O(alpha_S^2)) and resummed calculation (NLLA) to six observables are
used to estimate the error contributions. This yields the expectation of the
precision for alpha_S(500 GeV) of +-0.0025.


title:
Investigation of Power Corrections to Event Shape Variables measured in
  Deep-Inelastic Scattering

abstract:
  Deep-inelastic ep scattering data, taken with the H1 detector at HERA, are
used to study the event shape variables thrust, jet broadening, jet mass, C
parameter and two kinds of differential two-jet rate. The data cover a large
range of the four-momentum transfer Q, which is considered to be the relevant
energy scale, between 7 GeV and 100 GeV. The Q dependences of the mean values
are compared with second order calculations of perturbative QCD applying power
law corrections proportional to 1/Q^p to account for hadronization effects. The
concept of power corrections is investigated by fitting simultaneously a
non-perturbative parameter alpha_p and the strong coupling constant alpha_s.


title:
A Comparison of Deep Inelastic Scattering Monte Carlo Event Generators
  to HERA Data

abstract:
  The Monte Carlo models ARIADNE, HERWIG and LEPTO are compared to
deep-inelastic scattering data measured at the ep-collider HERA.


title: Hadronic Final States in Deep Inelastic Scattering at HERA

abstract:
  Results on the analysis of the hadronic final state in neutral current deep
inelastic scattering at HERA are presented; recent results on inclusive single
particle distributions, particle correlations and event shapes are highlighted.


title: Mass Measurement of the W-boson using the ALEPH Detector at LEP

abstract:
  The W-boson mass has been measured using the ALEPH detector at LEP.
Preliminary results from data taken in 1998 are added to previous measurements
to give mW = 80.411 +- 0.064(stat.) +- 0.037(syst.) +- 0.022(BE-CR) +-
0.018(LEP) GeV/c2.


title: Heavy Flavours in Collider Experiments

abstract:
  Current issues in the studies of Heavy Flavours in colliders are described
with particular emphasis on experiments in which the UK is involved. Results on
charm production at HERA are examined and compared to those at the Tevatron. B
production rates at the Tevatron as well as the status of B lifetimes and
mixing in the LEP collaborations and at the Tevatron are highlighted. The
measurement of sin2beta from CDF is described as well as the most recent
results on top physics at the Tevatron.


title: Study of Exclusive Radiative B Meson Decays

abstract:
  We have investigated exclusive, radiative B meson decays to charmless mesons
(\rho, \omega, \phi, K^*(892), K^*_2(1430)) in 9.7\times 10^6 BBbar decays
accumulated with the CLEO detector. The B -> K^*(892)\gamma branching fractions
are determined to be Br(B^0 -> K^{*0}(892)\gamma) = (4.55 +0.72-0.68
+-0.34)\times 10^-5 and Br(B^+ -> K^{*+}(892)\gamma) = (3.76 +0.89-0.83
+-0.28)\times 10^-5. We have searched for CP asymmetry in B -> K^*(892)\gamma
decays and measure Acp = +0.08 +-0.13 +-0.03. We also report the first
observation of the decay B -> K^*_2(1430)\gamma with a branching fraction of
(1.66 +0.59-0.53 +-0.13)\times 10^-5 and determine $Br(B ->
K^*_2(1430)\gamma)/Br(B -> K^*(892)\gamma) = 0.39 +0.15-0.13 consistent with
only one of two available theoretical models. No significant evidence for the
decays B -> \rho\gamma and B^0 -> \omega\gamma is found and we limit Br(B ->
(\rho/\omega)\gamma)/Br(B -> K^{*}(892)\gamma) < 0.32 at 90% CL. We also find
no evidence for the exotic decay B^0 -> \phi\gamma.


title:
Precise measurement of the b-quark fragmentation function in Z0 boson
  decays

abstract:
  We have developed a new technique for inclusive reconstruction of the energy
of B hadrons. The excellent efficiency and resolution of this technique allow
us to make the most precise determination of the b-quark fragmentation
function, using e+e- -> Z0 decays recorded in the SLD experiment at SLAC. We
compared our measurement with the predictions of a number of fragmentation
models. We excluded several of these models and measured the average scaled
energy of weakly-decaying B hadrons to be <x_B>=0.714+-0.005(stat)+-0.007(syst)
+-0.002(model dependence).


title: Two-body B Meson Decays to eta and eta': Observation of B->eta K*

abstract:
  In a sample of 19 million produced B mesons, we have observed the decays B ->
eta K* and improved our previous measurements of B -> eta'K. The branching
fractions we measure for these decay modes are BR(B+ -> eta K*+) = (26.4
+9.6-8.2 +- 3.3) x $10^{-6}$, BR(B0 -> eta K*0) = (13.8 +5.5-4.6 +- 1.6) x
$10^{-6}$, BR(B+ -> eta' K+) = (80 +10-9 +- 7) x $10^{-6}$ and BR(B0 -> eta'
K0) = (89 +18-16 +- 9) x $10^{-6}$. We have searched with comparable
sensitivity for related decays and report upper limits for these branching
fractions.


title: Recent atmospheric neutrino results from Soudan 2

abstract:
  An updated measurement of the atmospheric nu_mu/nu_e ratio-of-ratios,
0.68+-0.11+-0.06, has been obtained using a 4.6-kty exposure of the Soudan-2
iron tracking calorimeter. The L/E distributions have been analyzed for effects
of nu_mu -> nu_x oscillations, and an allowed region in the Delta m^2 vs. sin^2
2 theta plane has been determined.


title: Hard Single Diffraction in pbarp Collisions at root-s = 630 and 1800 GeV

abstract:
  Using the D0 detector, we have studied events produced in proton-antiproton
collisions that contain large forward regions with very little energy
deposition (``rapidity gaps'') and concurrent jet production at center-of-mass
energies of root-s = 630 and 1800 Gev. The fractions of forward and central jet
events associated with such rapidity gaps are measured and compared to
predictions from Monte Carlo models. For hard diffractive candidate events, we
use the calorimeter to extract the fractional momentum loss of the scattered
protons.


title: Search for a 33.9 MeV/c^2 Neutral Particle in Pion Decay

abstract:
  The E815 (NuTeV) neutrino experiment has performed a search for a 33.9
MeV/c^2 weakly-interacting neutral particle produced in pion decay. Such a
particle may be responsible for an anomaly in the timing distribution of
neutrino interactions in the KARMEN experiment. E815 has searched for this
particle's decays in an instrumented decay region; no evidence for this
particle was found. The search is sensitive to pion branching ratios as low as
10^-13.


title: Electron Beam M\O ller Polarimeter at Jlab Hall a

abstract:
  As part of the spin physics program at Jefferson Laboratory (JLab), a M\o
ller polarimeter was developed to measure the polarization of electron beam of
energies 0.8 to 5.0 GeV. A unique signature for M\o ller scattering is obtained
using a series of three quadrupole magnets which provide an angular selection,
and a dipole magnet for energy analysis. The design, commissioning, and the
first results of the polarization measurements of this polarimeter will be
presented as well as future plans to use its small scattering angle
capabilities to investigate physics in the very low $Q^2$ regime.


title: Charm Hadron Production Fractions

abstract:
  The world average values for the probabilities that a charm quark fragments
into D^*+ and Ds^+ have been calculated to be
f(c->D^*+)=0.235+/-0.007(+/-0.007) and f(c->Ds^+)=0.101+/-0.009(+/-0.025),
respectively. The average values for D^0, D^+ and Lambda_c^+ have been also
calculated.


title:
A Measurement of the W to tau+nu Production Cross Section in p-pbar
  Collisions at sqrt(s) = 1.8 TeV

abstract:
  We report on a measurement of sigma(p-pbar to W+X) times B(W to tau+nu) in
p-pbar collisions at sqrt(s) = 1.8 TeV at the Fermilab Tevatron. The
measurement is based on an integrated luminosity of 18 pb^-1 of data collected
with the D0 detector during 1994-1995. We find that sigma(p-pbar to W+X) times
B(W to tau+nu) = 2.22 +- 0.09 (stat) +- 0.10 (syst) +- 0.10 (lum) nb. Lepton
universality predicts that the ratio of the tau and electron electroweak
charged current couplings to the W boson, g_tau^W / g_e^W, be unity. We find
g_tau^W / g_e^W = 0.980 +- 0.031, in agreement with lepton universality.


title: The upgraded Outer em calorimeter of FOCUS at Fermilab

abstract:
  Operational performance, algorithms, stability and physics results of the
  Outer em calorimeter of FOCUS are overviewed.


title: Working with Arrays of Inexpensive EIDE Disk Drives

abstract:
  In today's marketplace, the cost per Terabyte of disks with EIDE interfaces
is about a third that of disks with SCSI. Hence, three times as many particle
physics events could be put online with EIDE. The modern EIDE interface
includes many of the performance features that appeared earlier in SCSI. EIDE
bus speeds approach 33 Megabytes/s and need only be shared between two disks
rather than seven disks. The internal I/O rate of very fast (and expensive)
SCSI disks is only 50 per cent greater than EIDE disks. Hence, two EIDE disks
whose combined cost is much less than one very fast SCSI disk can actually give
more data throughput due to the advantage of multiple spindles and head
actuators. We explore the use of 12 and 16 Gigabyte EIDE disks with motherboard
and PCI bus card interfaces on a number of operating systems and CPUs. These
include Red Hat Linux and Windows 95/98 on a Pentium, MacOS and Apple's
Rhapsody/NeXT/UNIX on a PowerPC, and Sun Solaris on a UltraSparc 10
workstation.


title: Optimizing Chirality and Scaling of Lattice Fermions

abstract:
  If we construct a lattice fermion formulation, there are a number of goals to
be considered: doubling should be avoided; even at finite lattice spacing, we
want to represent chiral symmetry in a sound way; and we are seeking a good
scaling behavior. Conceptually we have to require locality, and for practical
purposes we even desire a high level of locality. A further issue is a good
approximation to rotation invariance. Last but not least the formulation should
be simple enough to allow for efficient simulations. Here we report on a
construction, which is designed to do justice to all of these goals.


title: Partially Quenched Chiral Condensates from the Replica Method

abstract:
  A large-N_f expansion is used to compute the partially quenched chiral
condensate of QCD in the microscopic finite-volume scaling region.


title: A Chiral Phase Transition using a Fermion Cluster Algorithm

abstract:
  The recent solution to the fermion sign problem allows, for the first time,
the use of cluster algorithm techniques to compute certain fermionic path
integrals. To illustrate the underlying ideas behind the progress, a cluster
algorithm is constructed to study the chiral phase transition in a strongly
interacting staggered fermion model with an arbitrary mass term in 3+1
dimensions. Unlike conventional methods there is no difficulty in the cluster
method to approach the chiral (massless) limit. Results using the new algorithm
confirm that the chiral transition falls under the expected universality class.


title: Anisotropic Improved Actions

abstract:
  The studies of the quantum corrections for the anisotropy
parameter,$\eta(=\xi_R/\xi_B)$, for the improved actions, $\beta (C_0
L({Plaq.}) + C_1 L({Rect.}))$, are proceeded in the medium to strong coupling
region on anisotropic lattices. The global features for the $\eta$ parameters
as a function of $\beta$ and the coefficient $C_{1}$ have been clarified. It
has been found by the perturbative analysis that as $C_1$ decreases, the slope
of the $\eta(\beta)$ becomes less steep and for the actions whose $C_{1}$ is
less than -0.160, $\eta$ decreases as $\beta$ decreases, contrary to the case
of the standard action. In the medium to strong coupling region, the $\eta$
parameter begins to increase as $\beta$ decreases for all $C_{1}$. This means
that for the actions with $C_{1} < -0.160$, the one-loop perturbative results
for $\eta$ break down qualitatively and the $\eta$ parameters have a dip. As a
result of this dip structure the $\eta$ for Iwasaki's action remains close to
unity in the wide range of $\beta$.


title:
Perturbative Renormalization Factors of Baryon Number Violating
  Operators for Improved Quark and Gauge Actions in Lattice QCD

abstract:
  We calculate one-loop renormalization factors of three-quark operators, which
appear in the low energy effective Lagrangian of the nucleon decay, for
$O(a)$-improved quark action and gauge action including six-link loops. This
calculation is required to predict the hadronic nucleon decay matrix elements
in the continuum regularization scheme using lattice QCD. We present detailed
numerical results of the one-loop coefficients for general values of the clover
coefficients employing the several improved gauge actions in the Symanzik
approach and in the Wilson's renormalization group approach. The magnitudes of
the one-loop coefficients for the improved gauge actions show sizable reduction
compared to those for the plaquette action.


title: Domain wall fermions in vector theories

abstract:
  Applications of Domain Wall fermions to various vector-like lattice theories
are reviewed with an emphasis on QCD thermodynamics. Methods for improving
their chiral properties at strong coupling are discussed and results from
implementing them are presented.


title: Lattice QCD Calculations of the Sigma Commutator

abstract:
  As a direct source of information on chiral symmetry breaking within QCD, the
sigma commutator is of considerable importance. With recent advances in the
calculation of hadron masses within full QCD it is of interest to see whether
the sigma commutator can be calculated directly from the dependence of the
nucleon mass on the input quark mass. We show that provided the correct chiral
behaviour of QCD is respected in the extrapolation to realistic quark masses
one can indeed obtain a fairly reliable determination of the sigma commutator
using present lattice data. Within two-flavour, dynamical-fermion QCD the value
obtained lies in the range 45 to 55 MeV.


title: A numerical treatment of Neuberger's lattice Dirac operator

abstract:
  We describe in some detail our numerical treatment of Neuberger's lattice
Dirac operator as implemented in a practical application. We discuss the
improvements we have found to accelerate the numerical computations and give an
estimate of the expense when using this operator in practice.


title: The Stefan-Boltzmann law: SU(2) versus SO(3) lattice gauge theory

abstract:
  We investigate the high temperature limit of SU(2) and SO(3) lattice gauge
theory, respectively. In particular, we study the Stefan-Boltzmann constant in
both cases. As is well known, the Stefan-Boltzmann constant extracted from
SU(2) lattice gauge theory by incorporating finite size effects is smaller than
the continuum value which assumes three gluon degrees of freedom. On the other
hand, the extrapolation of our SO(3) lattice data comes much closer to the
continuum value. This rises the question whether SU(2) and SO(3) lattice gauge
theories represent different quantum theories in the continuum limit.


title:
Large-q expansion for the second moment correlation length in the
  two-dimensional q-state Potts model

abstract:
  We calculate the large-q expansion of the second moment correlation length at
the first order phase transition point of the q-state Potts model in two
dimensions both in the ordered and disordered phases to order 21 in
$1/\sqrt{q}$. They coincide with each other to the third term of the series but
differ a little in higher orders. Numerically the ratio of the second moment
correlation length in the two phases is not far from unity in all region of
q>4. The ratio of the second moment correlation length to the standard
correlation length in the disordered phase is far from unity, which suggests
that the second largest and smaller eigenvalues of the transfer matrix form a
continuum spectrum not only in the large-q region but also in all the region of
q>4.


title: Determinant of a new fermionic action on a lattice - (I)

abstract:
  We investigate, analytically and numerically, the fermion determinant of a
new action on a (1+1)-dimensional Euclidean lattice. In this formulation the
discrete chiral symmetry is preserved and the number of fermion components is a
half of that of Kogut-Susskind. In particular, we show that our fermion
determinant is real and positive for U(1) gauge group under specific
conditions, which correspond to gauge conditions on the infinite lattice. It is
also shown that the determinant is real and positive for SU(N) gauge group
without any condition.


title:
Chiral Symmetry Breaking in Strongly Coupled 1+1 Dimensional Lattice
  Gauge Theories

abstract:
  We analyse - within the hamiltonian formalism with staggered fermions - the
patterns of chiral symmetry breaking for the strongly coupled Schwinger and
$U({\cal N}_c)$-color `t Hooft models with one and two flavor of fermions.
Using the correspondence between these strongly coupled gauge models and
antiferromagnetic spin chains, we provide a rather intuitive picture of their
ground states, elucidate their patterns of chiral symmetry breaking, and
compute the pertinent chiral condensates. Our analysis evidences an intriguing
relationship between the values of the lattice chiral condensates of the `t
Hooft and Schwinger models with one flavor of fermions.


title: The Overlap-Dirac Operator: Topology and Chiral Symmetry Breaking

abstract:
  We review the spectral flow techniques for computing the index of the overlap
Dirac operator including results relevant for SUSY Yang-Mills theories. We
describe properties of the overlap Dirac operator, and methods to implement it
numerically. We use the results from the spectral flow to illuminate the
difficulties in numerical calculations involving domain wall and overlap
fermions.


title: Dirac operator index and topology of lattice gauge fields

abstract:
  The fermionic topological charge of lattice gauge fields, given in terms of a
spectral flow of the Hermitian Wilson--Dirac operator, or equivalently, as the
index of Neuberger's lattice Dirac operator, is shown to have analogous
properties to L\"uscher's geometrical lattice topological charge. The main new
result is that it reduces to the continuum topological charge in the classical
continuum limit. (This is sketched here; the full proof will be given in a
sequel to this paper.) A potential application of the ideas behind fermionic
lattice topological charge to deriving a combinatorial construction of the
signature invariant of a 4-manifold is also discussed.


title: String breaking in zero-temperature lattice QCD

abstract:
  The crossing from a static quark-antiquark system to a system of two
static-light mesons when the separation of the static quarks is increased is
calculated in zero-temperature lattice QCD. The mixing of these two states is
extracted from the lattice operators. We also discuss the breaking of an
excited string of a hybrid meson.


title:
Axial anomaly and Ginsparg-Wilson fermions in the Lattice Dirac Sea
  picture

abstract:
  The axial anomaly equation in 1+1 dimensional QED is obtained on the lattice
for fermions obeying the Ginsparg-Wilson relation. We make use of the
properties of the Lattice Dirac sea to investigate the connection between the
anomaly and the Ginsparg-Wilson operator in the Hamiltonian picture. The
correct anomaly is reproduced for gauge fields whose characteristic time is
much larger than the lattice spacing, which is the regime where the adiabatic
approximation applies. A non-zero Wilson $r$ parameter is necessary to get the
correct anomaly. The anomaly is shown to be independent of $r$ for $r>0.5$. The
generalization to 3+1 dimensions is also discussed.


title:
General Algorithm For Improved Lattice Actions on Parallel Computing
  Architectures

abstract:
  Quantum field theories underlie all of our understanding of the fundamental
forces of nature. The are relatively few first principles approaches to the
study of quantum field theories [such as quantum chromodynamics (QCD) relevant
to the strong interaction] away from the perturbative (i.e., weak-coupling)
regime. Currently the most common method is the use of Monte Carlo methods on a
hypercubic space-time lattice. These methods consume enormous computing power
for large lattices and it is essential that increasingly efficient algorithms
be developed to perform standard tasks in these lattice calculations. Here we
present a general algorithm for QCD that allows one to put any planar improved
gluonic lattice action onto a parallel computing architecture. High performance
masks for specific actions (including non-planar actions) are also presented.
These algorithms have been successfully employed by us in a variety of lattice
QCD calculations using improved lattice actions on a 128 node Thinking Machines
CM-5.
  {\underline{Keywords}}: quantum field theory; quantum chromodynamics;
improved actions; parallel computing algorithms.


title:
Calibration of Smearing and Cooling Algorithms in SU(3)-Color Gauge
  Theory

abstract:
  The action and topological charge are used to determine the relative rates of
standard cooling and smearing algorithms in pure SU(3)-color gauge theory. We
consider representative gauge field configurations on $16^3\times 32$ lattices
at $\beta=5.70$ and $24^3\times 36$ lattices at $\beta=6.00$. We find the
relative rate of variation in the action and topological charge under various
algorithms may be succinctly described in terms of simple formulae. The results
are in accord with recent suggestions from fat-link perturbation theory.


title: Fast methods for computing the Neuberger Operator

abstract:
  I describe a Lanczos method to compute the Neuberger Operator and a multigrid
algorithm for its inversion.