title: Measurement of the B Hadron Energy Distribution in Z0 Decays

abstract:
  We have measured the B hadron energy distribution in Z0 decays using a sample
of semi-leptonic B decays recorded in the SLD experiment at SLAC. The energy of
each tagged B hadron was reconstructed using information from the lepton and a
partially reconstructed charm-decay vertex. We compared the scaled energy
distribution with several models of heavy quark fragmentation. The average
scaled energy of primary B hadrons was found to be <x_E_B> = 0.716 +- 0.011
(stat.) +0.022 -0.021 (syst.).


title: Angular Intermittency and Analytical QCD Predictions

abstract:
  We present a comparison of local multiplicity fluctuations in angular
phase-space intervals with first-order QCD predictions. The data are based on
810k hadronic events at 91.2 GeV collected with the L3 detector at LEP during
1994.


title: Confronting QCD Instantons with HERA Data

abstract:
  The sensitivity of existing HERA data on the hadronic final state in
deep-inelastic scattering (DIS) to processes induced by QCD instantons is
systematically investigated. The maximally allowed fraction of such processes
in DIS is found to be on the percent level in the kinematic domain 0.0001 <
x-Bjorken < 0.01 and 5 < Q squared < 100 GeV squared. The best limits are
obtained from the multiplicity distribution.


title:
Dijet Cross Sections and Rapidity Gaps between Jets in photoproduction
  at HERA

abstract:
  Dijet cross sections from the original 1994 ZEUS data analysis are shown
compared to NLO calculations. New 1995 cross sections are shown compared to
Monte Carlo predictions. The fraction of dijet events with a rapidity gap
inbetween the jets is also presented for the new 1995 data.


title: Precision Measurements with High Energy Neutrino Beams

abstract:
  Neutrino scattering measurements offer a unique tool to probe the electroweak
and strong interactions as described by the Standard Model (SM). Electroweak
measurements are accessible through the comparison of neutrino neutral- and
charged-current scattering. These measurements are complimentary to other
electroweak measurements due to differences in the radiative corrections both
within and outside the SM. Neutrino scattering measurements also provide a
precise method for measuring the F_2(x,Q^2) and xF_3(x,Q^2 structure functions.
The predicted Q^2 evolution can be used to test perturbative Quantum
Chromodynamics as well as to measure the strong coupling constant, alpha _s,
and the valence, sea, and gluon parton distributions. In addition, neutrino
charm production, which can be determined from the observed dimuon events,
allows the strange-quark sea to be investigated along with measurements of the
CKM matrix element |V_{cd}| and the charm quark mass.


title:
Measurement of Dijet Angular Distributions and Search for Quark
  Compositeness

abstract:
  We have measured the dijet angular distribution in $\sqrt{s}$=1.8 TeV
$p\bar{p}$ collisions using the D0 detector. Order $\alpha^{3}_{s}$ QCD
predictions are in good agreement with the data. At 95% confidence the data
exclude models of quark compositeness in which the contact interaction scale is
below 2 TeV.


title:
An Interaction Region for Gamma-Gamma and Gamma-Electron Collisions at
  TESLA/SBLC

abstract:
  Linear colliders offer unique opportunities to study gamma-gamma (gg),
gamma-electron (ge) interactions. Using the laser backscattering method one can
obtain gg, ge colliding beams with an energy and luminosity comparable to that
in e+e- collisions. This work is a part of the Conceptual Design of TESLA/SBLC
linear colliders describing a second interaction region for gg, ge collisions.
We consider here possible physics in high energy gg, ge collisions, e -> g
conversion, requirements to lasers, collision schemes, attainable luminosities,
backgrounds, possible lasers, optics at the interaction region and other
associated problems.


title:
A Measurement of the Total Cross Section for $e^{+}e^{-}\to hadrons$ at
  $\sqrt{s}$=10.52 GeV

abstract:
  Using the CLEO detector at the Cornell Electron Storage Ring, we have made a
measurement of R=sigma(e+e- ->hadrons)/sigma(e+e- ->mu+mu-) =3.56+/-0.01+/-0.07
at ECM=10.52 GeV. This implies a value for the strong coupling constant of
alpha_s(10.52 GeV)=0.20+/-0.01+/-0.06, or alpha_s(M_Z)=0.13+/-0.005+/-0.03.


title:
Measurement of the Branching Fractions and Forward-Backward Asymmetries
  of the Z^0 into Light Quarks

abstract:
  Using approximately 4.3 million hadronic Z^0 decays collected with the OPAL
detector at LEP between 1990 and 1995, we measure the branching fractions of
the Z^0 into up-type and down-type light quarks, R_q, and the forward-backward
asymmetries, A_FB(q), using high-momentum stable particles as a tag. Adopting a
method that employs double tagged events to determine the flavour tagging
efficiencies, and assuming the flavour independence of strong interactions and
SU(2) isospin symmetry, we measure: R_{d,s}/(R_d + R_u + R_s) = 0.371 +/-
0.016(stat.) +/- 0.016(syst.) and A_FB(d,s) = 0.068 +/- 0.035(stat.) +/-
0.011(syst.), assuming the branching fractions and forward-backward asymmetries
of down and strange quarks to be equal. The results are essentially free of
assumptions based on hadronisation models. These results are in agreement with
the Standard Model expectations and are used to infer the left and right handed
couplings of strange/down quarks to the Z^0, yielding g_L^{d,s} =
-0.44^{+0.13}_{-0.09} and g_R^{d,s} = +0.13^{+0.15}_{-0.17}. The results for
the up quark, R_u/(R_d + R_u + R_s) = 0.258 +/- 0.031(stat.) +/- 0.032(syst.)
and A_FB(u)= 0.040 +/- 0.067(stat.) +/- 0.028(syst.), are fully negatively
correlated and almost completely positively correlated, respectively, with the
corresponding down-type results.


title: Colour-Singlet Exchange in ep Interactions

abstract:
  Results presented at the DIS97 workshop by the H1, ZEUS and E665
collaborations on processes yielding large rapidity gaps and energetic leading
baryons are reviewed. A consistent picture begins to emerge in which
diffractive processes dominate when the fractional longitudinal momentum loss
at the baryon vertex $\xpom$ is small, with substantial contributions from
other processes as $\xpom$ increases. The diffractive mechanism in the
deep-inelastic regime is found, both from inclusive measurements and final
state studies, to involve the exchange of a gluon carrying a large fraction of
the exchange momentum. Vector meson results show the transition from soft to
hard production mechanisms with increasing precision.


title:
A study of the centrally produced 4pi channel in pp interactions at 450
  GeV/c

abstract:
  The reaction pp -> pf (pi+pi-pi+pi-) ps has been studied at 450 GeV/c in an
experiment designed to search for gluonic states. A spin analysis has been
performed and the dPT filter applied. In addition to the well known f1(1285)
there is evidence for two JPC=2-+ states called the eta2(1620) and eta2(1875)
and a broad scalar called the f0(2000). The production of these states as a
function of the dPT kinematical filter shows the behaviour expected for qqbar
states. In contrast, there is evidence for two states at 1.45 GeV and at 1.9
GeV which do not show the behaviour observed for qqbar states.


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

abstract:
  Results are presented of an analysis of the reactions pp -> pf(k0k+pi-)ps and
pp -> pf(K0K0pi0)ps at 450 GeV/c. Clear f1(1285) and f1(1420) signals are seen
and a spin parity analysis shows that both have IG JPC=0+ 1++. The f1(1285)
decays to a0(980)pi and the f1(1420) decays to K* Kbar. Both states have a
similar dependence as a function of dPT consistent with what has been observed
for other qqbar states. Evidence is also presented for a K*Kbar decay mode of
the eta2(1620).


title:
An upper limit on the branching ratio for tau decays into seven charged
  particles

abstract:
  We have searched for decays of the tau lepton into seven or more charged
particles, using data collected with the OPAL detector from 1990 to 1995 in
e^+e^- collisions at sqrt(s) ~ M_Z. No candidate events were found and an upper
limit on the branching ratio for tau decays into seven charged particles of 1.8
x 10^-5 at the 95% confidence level was determined.


title: Some Properties of the Very High Q^2 Events of HERA

abstract:
  The kinematic reconstruction of neutral current high Q^2 events at HERA is
discussed in detail using as an example the recently published events of the H1
and ZEUS collaborations at Q^2 > 15000 GeV^2 and M > 180 GeV, which are more
numerous than expected from Standard Model predictions. Taking into account the
complete information of these events, the mass reconstruction is improved and
the difference between the average mass of the samples of the two experiments
is reduced from 26+/-10 GeV to 17+/-7 GeV, but remains different enough to
render unlikely an interpretation of the excess observed by the two
collaborations as originating from the decay of a single narrow resonance.


title:
Measurement of the Proton Structure Function F_2 and
  \sigma_{tot}^{\gamma^* p} at Low Q^2 and Very Low x at HERA

abstract:
  A small electromagnetic sampling calorimeter, installed in the ZEUS
experiment in 1995, significantly enhanced the acceptance for very low x and
low Q^2 inelastic neutral current scattering, e^{+}p \to e^{+}X, at HERA. A
measurement of the proton structure function F_2 and the total virtual
photon-proton (\gamma^*p) cross-section is presented for 0.11 \le Q^{2} \le
0.65 GeV^2 and 2 \times 10^{-6} \le x \le 6 \times 10^{-5}, corresponding to a
range in the \gamma^{*}p c.m. energy of 100 \le W \le 230 GeV. Comparisons with
various models are also presented.


title: Measuring the CKM Matrix Element Vtb at DZero and CDF

abstract:
  I present measurements by the CDF collaboration of the Standard Model three
generation CKM matrix element Vtb and of a special case extension with
additional assumptions, using current Tevatron ttbar data. I then show how we
can significantly improve the precision on Vtb and at the same time extend the
measurement so it is not constrained by Standard Model assumptions, using
single top production at the upgraded Tevatron.


title: Study of the Decay tau^- \to 2pi^- pi^+ 3pi^0 nu_{tau}$

abstract:
  The decay tau- -> 2pi- pi+ 3pi0 nu_tau has been studied with the CLEO II
detector at the Cornell Electron Storage Ring (CESR). The branching fraction is
measured to be (2.85 +/- 0.56 +/- 0.51) x 10^(-4). The result is in good
agreement with the isospin expectation but somewhat below the
Conserved-Vector-Current (CVC) prediction. We have searched for resonance
substructure in the decay. Within the statistical precision, the decay is
saturated by the channels tau- -> pi- 2pi0 omega nu_tau, 2pi- pi+ eta nu_tau,
and pi- 2pi0 eta nu_tau. This is the first observation of this omega decay mode
and the branching fraction is measured to be (1.89 +0.74/-0.67 +/- 0.40) x
10^(-4).


title:
Measurements of the Meson-Photon Transition Form Factors of Light
  Pseudoscalar Mesons at Large Momentum Transfer

abstract:
  Using the CLEO-II detector, we have measured the form factors associated with
the electromagnetic transitions $\gamma^*\gamma \to $ meson. We have measured
these form factors in the momentum transfer ranges from 1.5 to 9, 20, and 30
GeV^2 for $\pi^0, \eta$, and $\eta'$, respectively. We present a brief review
of the final results of our analysis.


title: Search for the Decay $\tau^{-}\to 4pi^{-}3\pi^{+}(\pi^{0})\nu_{\tau}$

abstract:
  We have searched for the decay of the tau lepton into seven charged particles
and zero or one pi0. The data used in the search were collected with the CLEO
II detector at the Cornell Electron Storage Ring (CESR) and correspond to an
integrated luminosity of 4.61 fb^(-1). No evidence for a signal is found.
Assuming all the charged particles are pions, we set an upper limit on the
branching fraction, B(tau- -> 4pi- 3pi+ (pi0) nu_tau) < 2.4 x 10^(-6) at the
90% confidence level. This limit represents a significant improvement over the
previous limit.


title: Diffractive Phenomena at Tevatron

abstract:
  Preliminary results from the D0 experiment on jet production with rapidity
gaps in $p\bar{p}$ collisions are presented. A class of dijet events with a
forward rapidity gap is observed at center-of-mass energies $\sqrt{s}$ = 1800
GeV and 630 GeV. The number of events with rapidity gaps at both center-of-mass
energies is significantly greater than the expectation from multiplicity
fluctuations and is consistent with a hard single diffractive process. A class
of events with two forward gaps and central dijets are also observed at 1800
GeV. This topology is consistent with hard double pomeron exchange. We also
present proposed plans for extending these analysis into Run II through the use
of a forward proton detector.


abstract:
  Using the CLEO~II detector, we have measured the differential cross sections
for exclusive two-photon production of light pseudoscalar mesons $\pi^0$,
$\eta$, and $\eta^{\prime}$. From our measurements we have obtained the form
factors associated with the electromagnetic transitions $\gamma^*\gamma$ $\to$
meson. We have measured these form factors in the momentum transfer ranges from
1.5 to 9, 20, and 30 GeV$^2$ for $\pi^0$, $\eta$, and $\eta^{\prime}$,
respectively, and have made comparisons to various theoretical predictions.


title:
The Design and Performance of the ZEUS Central Tracking Detector
  z-by-Timing System

abstract:
  The ZEUS Central Tracking Detector utilizes a time difference measurement to
provide a fast determination of the z-coordinate of each hit. The z-by-timing
measurement is achieved by using a Time-to-Amplitude Converter which has an
intrinsic timing resolution of 36 ps, has pipelined readout, and has a multihit
capability of 48 ns. In order to maintain the required sub-nanosecond timing
accuracy, the technique incorporates an automated self-calibration system. The
readout of the z-by-timing data utilizes a fully customized timing control
system which runs synchronously with the HERA beam-crossing clock, and a data
acquisition system implemented on a network of Transputers. Three dimensional
space-points provided by the z-by-timing system are used as input to all three
levels of the ZEUS trigger and for offline track reconstruction. The average
z-resolution is determined to be 4.4 cm for multi-track events from
positron-proton collisions in the ZEUS detector.


title:
Search for Scalar Leptoquark Pairs Decaying to Electrons and Jets in
  pbarp Collisions

abstract:
  We have searched for the pair production of first generation scalar
leptoquarks in the eejj channel using the full data set (123 pb-1) collected
with the D0 detector at the Fermilab Tevatron during 1992--1996. We observe no
candidates with an expected background of approximately 0.4 events. Comparing
the experimental 95% confidence level upper limit to theoretical calculations
of the cross section with the assumption of a 100% branching fraction to eq, we
set a lower limit on the mass of a first generation scalar leptoquark of 225
GeV/c^2. The results of this analysis rule out the interpretation of the excess
of high Q^2 events at HERA as leptoquarks which decay exclusively to eq.


title: Present Searches for Higgs Signatures at the Tevatron

abstract:
  We present results for various searches for signatures of standard and
non-standard model Higgs boson decays conducted at the collider detectors CDF
and DO using ~ 100 pb^-1 of integrated luminosity each from the Tevatron
Collider Run 1 (1992-96) at \sqrt{s} = 1.8 TeV. No evidence for a Higgs boson
decay is found and various limits are set.


title:
DIRC, the Internally Reflecting Ring Imaging Cherenkov Detektor for
  BaBar: Properties of the Quartz Radiators

abstract:
  The DIRC is a Cherenkov imaging detector based on total internal reflection
for the BaBar detector at PEP-II. The principles of the DIRC ring imaging
Cherenkov technique are explained and its choice for the BaBar detector
particle identification system is motivated. The detector design and the status
of the R&D are discussed. Results of the measurement of the optical properties
and radiation damage of the the radiators, long rectangular bars made of
synthetic fused silica, are presented.


title: A Water Tank Cerenkov Detector for Very High Energy Astroparticles

abstract:
  Extensive airshower detection is an important issue in current astrophysics
endeavours. Surface arrays detectors are a common practice since they are easy
to handle and have a 100% duty cycle. In this work we present an experimental
study of the parameters relevant to the design of a water Cerenkov detector for
high energy airshowers. This detector is conceived as part of the surface array
of the Pierre Auger Project, which is expected to be sensitive to ultra high
energy cosmic rays. In this paper we focus our attention in the geometry of the
tank and its inner liner material, discussing pulse shapes and charge
collections.


title: Search for new physics at HERA

abstract:
  Recent results on the searches for new physics in ep collisions at HERA using
the ZEUS and H1 detectors are presented. No evidence for excited fermions or
supersymmetric particles within the context of the Minimal Supersymmetric
Standard Model nor R-parity violation has been found using an integrated
luminosity of up to 20 inv pb. New limits have therefore been established.


title: QCD Effects in Hadronic Final States

abstract:
  Progress in the study of hadronic final states in deep inelastic scattering
as well as $p\bar{p}$, photoproduction and $e^+e^-$ annihilation, as presented
at the DIS97 workshop, is reviewed.


title: H1 Results in Deep Inelastic Scattering

abstract:
  Recent deep inelastic results from the H1 collaboration are presented. The
topics covered include inclusive diffractive physics, the determination of
alpha_S using the event shapes, the study of the hadronic final state at low x
with single particles and with jets, the structure function measurements in
particular F_2 at low Q^2 and the high Q^2 physics both in neutral and charged
current.


title: Production of Jets at the Tevatron

abstract:
  Measurements of the inclusive jet cross section and the dijet angular
distribution using data from the Tevatron are presented. Comparisons to NLO QCD
show good agreement below 250 GeV, but CDF data show an excess at higher ET;
qualitative agreement is seen between the CDF and DO cross sections. Analysis
of the dijet angular distributions exclude quark compositeness below 2.1 TeV.


title: Measurement of the pbar p -> Ks Ks Reaction from 0.6 to 1.9 GeV/c

abstract:
  The pbar p -> Ks Ks -> 4pi+/- cross section was measured at incident
antiproton momenta between 0.6 and 1.9 GeV/c using the CERN Low Energy
Antiproton Ring (LEAR). This investigation was part of a systematic study of
in-flight antiproton-proton annihilations into two-neutral-meson final states
in a search for hadronic resonances. A coarse scan of the pbar p -> Ks Ks cross
section as a function of center-of-mass energy between 1.964 and 2.395 GeV/c^2
and a fine scan of the region surrounding the Xi(2220) are presented. Upper
limits on the product branching ratio BR(Xi -> pbar p)BR(Xi -> Ks Ks) are
determined for a wide range of mass and width assumptions based on the
non-observation of the Xi(2220). A rise in the pbar p -> Ks Ks cross section is
observed near 2.15 GeV/c^2, which is consistent with the f2(2150) resonance.


title: Monte-Carlo Simulation for an Aerogel Cherenkov Counter

abstract:
  We have developed a Monte-Carlo simulation code for an aerogel \v Cerenkov
Counter which is operated under a strong magnetic field such as 1.5T. This code
consists of two parts: photon transportation inside aerogel tiles, and
one-dimensional amplification in a fine-mesh photomultiplier tube. It simulates
the output photoelectron yields as accurately as 5% with only a single free
parameter. This code is applied to simulations for a B-Factory
particle-identification system.


title: Charm Production at HERA

abstract:
  Measurements of open charm production at HERA are reviewed. The paper covers
both photoproduction and Deep Inelastic Scattering measurements from the ZEUS
and H1 collaborations.


title: An Experimenter's Highlights

abstract:
  This selection concentrates more on $\gamma \gamma$ results, with some
reference to the related HERA photoproduction data. Progress has been made on a
wide range of topics, from $F_{2}^{\gamma}$ to the ``stickiness'' of glueball
candidates, but many channels still need better statistics and/or a real photon
target before they can match the comparable $ep$ studies.


title: Status report of the NA48 experiment at the CERN SPS

abstract:
  The aim of the NA48 experiment at the CERN SPS is to measure direct CP
violation in neutral kaon decays thus determining the parameter
$\epsilon'/\epsilon$ with an accuracy of $2\times 10^{-4}$. The advantages of
NA48 with respect to previous experiments are high statistics and reduced
systematic effects. The principle of the experiment and the performance of the
detector components are presented.


title: Results on Diffraction

abstract:
  Results on hard diffraction from HERA and proton-antiproton Colliders are
reviewed with emphasis on the factorization properties of the diffractive
structure function of the proton and on the structure of the pomeron.


title:
Experimental Search for Chargino and Neutralino Production in
  Supersymmetry Models with a Light Gravitino

abstract:
  We search for inclusive high $E_T$ diphoton events with large missing
transverse energy in $p\bar{p}$ collisions at $\sqrt{s}$=1.8 TeV. Such events
are expected from pair production of charginos and neutralinos within the
framework of the minimal supersymmetric standard model with a light gravitino.
No excess of events is observed. In that model, and assuming gaugino mass
unification at the GUT scale, we obtain a 95% CL exclusion region in the
supersymmetry parameter space and lower mass bounds of 150 GeV/c$^2$ for the
lightest chargino and 75 GeV/c$^2$ for the lightest neutralino.


title: Two Photon Physics at LEP2; including data Monte-Carlo comparison

abstract:
  A partisan review of some of the most important $\gamma\gamma$ channels
accessible at LEP 2, with special stress on the measurement of the photon
structure function $F_{2}^{\gamma}$ and on associated problems with Monte Carlo
modelling.


title: A Search for Excited Fermions in e+ p Collisions at HERA

abstract:
  Using the ZEUS detector at HERA, we have searched for heavy excited states of
electrons, neutrinos, and quarks in $e^+p$ collisions at a center-of-mass
energy of 300~GeV. With an integrated luminosity of 9.4~pb$^{-1}$, no evidence
was found for electroweak production and decay of such states. Limits on the
production cross section times branching ratio and on the characteristic
couplings, $f/\Lambda$, are derived for masses up to 250~GeV. For the
particular choice $f/\Lambda = 1/M_{f^*}$, we exclude at the 95% confidence
level excited electrons with mass between 30 and 200~GeV, excited electron
neutrinos with mass between 40 and 96~GeV, and quarks excited electroweakly
with mass between 40 and 169~GeV.


title: Bounds on QCD Instantons from HERA

abstract:
  Signals for processes induced by QCD instantons are searched for in HERA data
on the hadronic final state in deep-inelastic scattering. The maximally allowed
fraction of instanton induced events is found at 95% confidence level to be on
the percent level in the kinematic domain 0.0001<x<0.01 and 5 < Q-squared < 100
GeV-squared. The most stringent limits are obtained from the multiplicity
distributions.


title: Open Heavy Flavor Production in Deeply Inelastic ep Scattering at HERA

abstract:
  Recent results on inclusive D^0 and D^{*+-} production in deeply inelastic ep
scattering at sqrt(s)=301 GeV are summarized. The data have been collected by
the H1 and ZEUS experiments at HERA. The total and the differential cross
sections are discussed in the framework of LO and NLO QCD predictions. The data
exhibit clear evidence for boson gluon fusion dominating open heavy flavor
production in the kinematic range currently explored at HERA. The measurements
of F_2^{cc}(x,Q^2) at small Bjorken x are presented. The prospects for future
analyses of open charm and beauty production including detector upgrades and
anticipated high luminosities are investigated.


title: Measurement of Inelastic J/Psi Photoproduction at HERA

abstract:
  We present a measurement of the inelastic, non diffractive J/$\psi$
photoproduction cross section in the reaction $e^{+} p \to e^{+} {J}/\psi X$
with the ZEUS detector at HERA. The J/$\psi$ was identified using both the
$\mu^{+}\mu^{-}$ and $e^{+}e^{-}$ decay channels and events were selected
within the range $0.4<z<0.9$ ($0.5<z<0.9$) for the muon (electron) decay mode,
where $z$ is the fraction of the photon energy carried by the J/$\psi$ in the
proton rest frame. The cross section, the $p^2_T$ and the $z$ distributions,
after having subtracted the contributions from resolved photon and diffractive
proton dissociative processes, are given for the photon-proton centre of mass
energy range $50<W<180$ GeV; $p^2_T$ is the square of the J/$\psi$ transverse
momentum with respect to the incoming proton beam direction. In the kinematic
range $0.4 < z < 0.9$ and $p^2_T > 1$ GeV$^2$, NLO calculations of the
photon-gluon fusion process based on the colour-singlet model are in good
agreement with the data. The predictions of a specific leading order
colour-octet model, as formulated to describe the CDF data on J/$\psi$
hadroproduction, are not consistent with the data.


title: Observation of the Decay K^+ --> pi^+ gamma gamma

abstract:
  The first observation of the decay K^+ --> pi^+ gamma gamma is reported. A
total of 31 events was observed with an estimated background of 5.1 +- 3.3
events in the pi+ momentum range from 100 MeV/c to 180 MeV/c. The corresponding
partial branching ratio, B(K+ -> pi+ gamma gamma, 100 MeV/c < P_pi^+ < 180
MeV/c), is (6.0 +- 1.5 (stat) +- 0.7 (sys)) x 10^{-7}. No K^+ --> pi^+ gamma
gamma decay was observed in the pi^+ momentum region greater than 215 MeV/c.
The observed pi^+ momentum spectrum is compared with the predictions of chiral
perturbation theory.


title: Observation of the Decay K+ --> pi+ mu+ mu-

abstract:
  We have observed the rare decay K+ --> pi+ mu+ mu- and measured the branching
ratio Gamma(K+ --> pi+ mu+ mu-)/Gamma(K+ --> all) = (5.0 +/- 0.4 (stat.) +/-
0.7 (sys.) +/- 0.6 (theor.)) x 10^{-8}. We compare this result with predictions
from chiral perturbation theory and estimates based on the decay K+ --> pi+ e+
e-.


title: Searches for Scalar Top and Scalar Bottom Quarks at LEP2

abstract:
  Searches for scalar top and bottom quarks have been performed with data
collected by the ALEPH detector at LEP. The data sample consists of 21.7 pb^-1
taken at sqrt{s} = 161, 170, and 172~GeV and 5.7 pb^-1 taken at sqrt{s} = 130
and 136~GeV. No evidence for scalar top quarks or scalar bottom quarks was
found in the channels stop --> c chi, stop --> b l snu, and sbottom --> b chi.
For the channel stop --> c chi a limit of 67 GeV/c^2 has been set on the scalar
top quark mass, independent of the mixing angle between the supersymmetric
partners of the left and right-handed states of the top quark. This limit
assumes a mass difference between the stop and the chi of at least 10 GeV/c^2.
For the channel stop --> b l snu the mixing-angle independent scalar top limit
is 70 GeV/c^2, assuming a mass difference between the stop and the snu of at
least 10 GeV/c^2. For the channel sbottom --> b chi, a limit of 73 GeV/c^2 has
been set on the mass of the supersymmetric partner of the left-handed state of
the bottom quark. This limit is valid if the mass difference between the
sbottom and the chi is at least 10 GeV/c^2.


title: Determining the CKM Parameter Vcd from nuN Charm Production

abstract:
  The formalism for extracting the CKM parameter $V_{cd}$ from $\nu N$
production of charm is discussed in some detail. The various model assumptions
needed are clearly pointed out. A direct determination from neutrino induced
dimuon production requires $\nu N$ charm production data, $% \nu N$ charm
hadronization data, and the semi-muonic branching ratios for charmed hadrons.
Hadronization data from FNAL E531 is re-analyzed to take advantage of
better-determined properties of the charmed hadrons. A small bias in the
original published result is removed. Neutrino induced charm fragmentation is
compared to $e^{+}e^{-}$ charm fragmentation functions; the data are consistent
with a common hadronization scheme. An updated value of the mean semi-muonic
branching ratio for charmed hadrons produced in $\nu N$ scattering for $E_\nu
>30$ GeV is obtained. This value is used to determine $% V_{cd}$ and its
associated uncertainties. Prospects for improving the $% V_{cd} $ measurement
to test the unitarity limit of the CKM matrix are described.


title: A Measurement of Rb using a Vertex Mass Tag

abstract:
  We report a new measurement of Rb = Gamma(Z0->b-bbar) / Gamma(Z0->hadrons)
using a double tag technique, where the b hemisphere selection is based on the
reconstructed mass of the B hadron decay vertex. The measurement was performed
using a sample of 130k hadronic Z0 events, collected with the SLD at the SLC.
The method utilizes the 3-D vertexing abilities of the CCD pixel vertex
detector and the small stable SLC beams to obtain a high b-tagging efficiency
and purity. We obtain Rb=0.2142+/-0.0034(stat.)+/-0.0015(syst.)+/-0.0002(R_c).


title: Inclusive Measurement of Diffractive Deep-inelastic ep Scattering

abstract:
  A measurement is made of the cross section for the process ep --> eXY in
deep-inelastic scattering with the H1 detector at HERA. The cross section is
presented in terms of a differential structure function F_2^D(3)(x_P,beta,Q^2)
of the proton over the kinematic range 4.5 < Q^2 < 75 GeV^2. The dependence of
F_2^D(3) on x_P is found to vary with beta, demonstrating that a factorisation
of F_2^D(3) with a single diffractive flux independent of beta and Q^2 is not
tenable. An interpretation in which a leading diffractive exchange and a
subleading reggeon contribute to F_2^D(3) reproduces well the x_P dependence of
F_2^D(3) with values for the pomeron and subleading reggeon intercepts of
alpha_P(0)=1.203 \pm 0.020(stat.)\pm 0.013(sys.) ^{+0.030}_{-0.035}(model} and
alpha_reg(0)=0.50\pm 0.11(stat.)\pm 0.11 (sys.}^{+0.09}_{-0.10} (model),
respectively. A fit is performed of the data using a QCD motivated model, in
which parton distributions are assigned to the leading and subleading
exchanges. In this model, the majority of the momentum of the pomeron must be
carried by gluons in order for the data to be well described.


title:
Search for First Generation Leptoquark Pair Production in ppbar
  Collisions at s^1/2 = 1.8 TeV

abstract:
  We present a search for first generation leptoquark with 110pb^1 of data
collected with the CDF detector. We set 95% C.L. cross section limits as a
function of the leptoquark mass.


title:
Search for Chargino and Neutralino Production at sqrt{s} = 170 and 172
  GeV at LEP

abstract:
  A search for charginos and neutralinos, predicted by supersymmetric theories,
has been performed using a data sample of 10.3 pb^-1 at centre-of-mass energies
of sqrt(s) = 170 and 172 GeV with the OPAL detector at LEP. No evidence for
these particles has been found. The results are combined with those from
previous OPAL chargino and neutralino searches at lower energies to obtain
limits. Exclusion regions at 95% C.L. of parameters of the Minimal
Supersymmetric Standard Model are determined. Within this framework, for
tan(beta) >= 1.0, lower mass limits are placed on the lightest chargino and the
three lightest neutralinos. The 95% C.L. lower mass limit on the lightest
chargino, assuming that it is heavier than the lightest neutralino by more than
10 GeV, is 84.5 GeV for the case of a large universal scalar mass (m_0 > ~1
TeV) and 65.7 GeV for the smallest m_0 compatible with current limits on the
sneutrino and slepton masses. The lower limit on the lightest neutralino mass
at 95% C.L. for tan(beta) >= 1.0 is 24.7 GeV for m_0 = 1 TeV and 13.3 GeV for
the minimum m_0 scenario. These mass limits are higher for increasing values of
tan(beta). The interpretation of the limits in terms of gluino and scalar quark
mass limits is also given.


title:
Measurement of the Q^2 evolution of the photon structure function
  F_2^gamma

abstract:
  New measurements are presented of the photon structure function F_2^gamma(Q)
at four values of Q^2 between 9 and 59 GeV/c^2 based on data collected with the
OPAL detector at centre-of-mass energies of 161-172 GeV, with a total
integrated luminosity of 18.1 pb^-1. The evolution of F_2^gamma with Q^2 in
bins of x is determined in the Q^2 range from 1.86 to 135 GeV/c^2 using data
taken at centre-of-mass energies of 91 GeV and 161-172 GeV. F_2^gamma is
observed to increase with Q^2 with a slope of 1/alpha_em dF_2^gamma/dln(Q^2) =
0.10 +0.05 -0.03 measured in the range 0.1 < x < 0.6.


title:
Measurement of the quark to photon fragmentation function through the
  inclusive production of prompt photons in hadronic Z^0 decays

abstract:
  The inclusive production of prompt photons with energy above 10 GeV is
measured using the OPAL detector in hadronic Z^0 decays at LEP. In contrast to
previous measurements, the prompt photons were not required to be isolated. The
production rate and energy spectrum are found to be in agreement with QCD
predictions for the quark-to-photon fragmentation function.


title:
Measurement of f(c -> D^*+ X), f(b -> D^*+ X) and
  Gamma_cc(bar)/Gamma_had using D^*+/- Mesons

abstract:
  The production rates of D^*+/- mesons in charm and bottom events at
centre-of-mass energies of about 91 GeV and the partial width of primary
cc(bar) pairs in hadronic Z^0 decays have been measured at LEP using almost 4.4
million hadronic Z^0 decays collected with the OPAL detector between 1990 and
1995. Using a combination of several charm quark tagging methods based on fully
and partially reconstructed D^*+/- mesons, and a bottom tag based on identified
muons and electrons, the hadronisation fractions of charm and bottom quarks
into D^*+/- mesons have been found to be:
  f(b -> D^*+ X) = 0.173 +/- 0.016 +/- 0.012 and
  f(c -> D^*+ X) = 0.222 +/- 0.014 +/- 0.014
  The fraction of cc(bar) events in hadronic Z^0 decays,
Gamma_cc(bar)/Gamma_had = Gamma(Z^0 -> cc(bar))/Gamma(Z^0 -> hadrons), is
determined to be
  Gamma_cc(bar)/Gamma_had = 0.180 +/- 0.011 +/- 0.012 +/- 0.006
  In all cases the first error is statistical, and the second one systematic.
The last error quoted for Gamma_cc(bar)/Gamma_had is due to external branching
ratios.


title: Spin alignment of leading K*(892)^0 mesons in hadronic Z^0 decays

abstract:
  Helicity density matrix elements for inclusive K*(892)^0 mesons from hadronic
Z^0 decays have been measured over the full range of K^*0 momentum using data
taken with the OPAL experiment at LEP. A preference for occupation of the
helicity zero state is observed at all scaled momentum x_p values above 0.3,
with the matrix element rho_00 rising to 0.66 +/- 0.11 for x_p > 0.7. The
values of the real part of the off-diagonal element rho_1-1 are negative at
large x_p, with a weighted average value of -0.09 +/- 0.03 for x_p > 0.3, in
agreement with new theoretical predictions based on Standard Model parameters
and coherent fragmentation of the qq(bar) system from the Z^0 decay. All other
helicity density matrix elements measured are consistent with zero over the
entire x_p range. The K^*0 fragmentation function has also been measured and
the total rate determined to be 0.74 +/- 0.02 +/- 0.02 K*(892)^0 mesons per
hadronic Z^0 decay.


title: A Measurement of the B_s^0 Lifetime using Reconstructed D_s^- Mesons

abstract:
  We report a measurement of the B^0_s meson lifetime from B_s^0 -> D^-_s X
decays, where D_s^- mesons are reconstructed in the D_s^- -> phi pi^- and D_s^-
-> K^{*0} K^- decay channels. From approximately 3.7 million hadronic Z^0
decays recorded by the OPAL detector at LEP a sample is selected containing 911
+/- 83 candidates, of which 519 +/- 136 are estimated to be from B_s^0 meson
decays. Fitting the distribution of the distance from the beam spot to the
decay vertex of the D_s^- candidates with an unbinned likelihood function we
measure
  tau(B_s^0) = 1.72 + 0.20 - 0.19 + 0.18 - 0.17 ps,
  where the errors are statistical and systematic, respectively.


title:
Tests of the Standard Model and Constraints on New Physics from
  Measurements of Fermion-pair Production at 130-172 GeV at LEP

abstract:
  Production of events with hadronic and leptonic final states has been
measured in e^+e^- collisions at centre-of-mass energies of 130-172 GeV, using
the OPAL detector at LEP. Cross-sections and leptonic forward-backward
asymmetries are presented, both including and excluding the dominant production
of radiative Z \gamma events, and compared to Standard Model expectations. The
ratio R_b of the cross-section for bb(bar) production to the hadronic
cross-section has been measured. In a model-independent fit to the Z lineshape,
the data have been used to obtain an improved precision on the measurement of
\gamma-Z interference. The energy dependence of \alpha_em has been
investigated. The measurements have also been used to obtain limits on
extensions of the Standard Model described by effective four-fermion contact
interactions, to search for t-channel contributions from new massive particles
and to place limits on chargino pair production with subsequent decay of the
chargino into a light gluino and a quark pair.


title:
Proton-Antiproton Annihilation and Meson Spectroscopy with the Crystal
  Barrel

abstract:
  This report reviews the achievements of the Crystal Barrel experiment at the
Low Energy Antiproton Ring (LEAR) at CERN. During seven years of operation
Crystal Barrel has collected very large statistical samples in pbarp
annihilation, especially at rest and with emphasis on final states with high
neutral multiplicity. The measured rates for annihilation into various two-body
channels and for electromagnetic processes have been used to test simple models
for the annihilation mechanism based on the quark internal structure of
hadrons. From three-body annihilations three scalar mesons, a0(1450), f0(1370)
and f0(1500) have been established in various decay modes. One of them,
f0(1500), may be identified with the expected ground state scalar glueball.


title: Search For New Particles in Multijet Final States at the Tevatron

abstract:
  We present the latest results of the searches for new particles in hadronic
final states performed in proton-antiproton collisions at a center of mass
energy of 1.8 TeV. The large data samples collected with the CDF and D0
detectors at the Tevatron collider between 1992 and 1995 allow searches for low
cross section phenomena in dijet and multijet events, despite the hindrance of
the high background from normal QCD processes. However, no signal for new
physics is found, and the data show good agreement with QCD. Limits on the mass
and on the cross section of the searched states can thus be set.


title: Asymmetry of Lambda Baryons in Hadronic Z^0 Decays

abstract:
  The longitudinal polarization, the transverse polarization, and the
forward-backward asymmetry of Lambda baryons have been measured using a sample
of 4.34 million hadronic Z^0 decays collected with the OPAL detector at LEP
between 1990 and 1995. These results are important as an aid to the
understanding of hadronization mechanisms. Significant longitudinal
polarization has been observed at intermediate and high momentum. For x_E = 2
E_{Lambda}/\sqrt{s}) > 0.3, the longitudinal polarization has been measured to
be -32.9 +/- 5.5(stat) +/- 5.2(syst)%. We have observed no transverse
polarization. A significant forward-backward asymmetry has been measured and
can be described by a JETSET model.


title: Measurement of the Photon Structure Function F_2^gamma at Low x

abstract:
  Deep inelastic electron-photon scattering is studied using e+e- data
collected by the OPAL detector at centre-of-mass energies sqrt{s_ee} ~ M_{Z^0}.
The photon structure function F_2^gamma(x,Q^2) is explored in a Q^2 range of
1.1 to 6.6 GeV/c^2 at lower x values than ever before. To probe this kinematic
region events are selected with a beam electron scattered into one of the OPAL
luminosity calorimeters at scattering angles between 27 and 55 mrad. A
measurement is presented of the photon structure function F_2^gamma(x,Q^2) at
<Q^2> = 1.86 GeV^2 and 3.76 GeV^2 in five logarithmic x bins from 0.0025 to
0.2.


title:
Multiplicity distributions of gluon and quark jets and tests of QCD
  analytic predictions

abstract:
  Gluon jets are identified in e+e- hadronic annihilation events by tagging two
quark jets in the same hemisphere of an event. The gluon jet is defined
inclusively as all the particles in the opposite hemisphere. Gluon jets defined
in this manner have a close correspondence to gluon jets as they are defined
for analytic calculations, and are almost independent of a jet finding
algorithm. The charged particle multiplicity distribution of the gluon jets is
presented, and is analyzed for its mean, dispersion, skew, and curtosis values,
and for its factorial and cumulant moments. The results are compared to the
analogous results found for a sample of light quark (uds) jets, also defined
inclusively. We observe differences between the mean, skew and curtosis values
of gluon and quark jets, but not between their dispersions. The cumulant moment
results are compared to the predictions of QCD analytic calculations. A
calculation which includes next-to-next-to-leading order corrections and energy
conservation is observed to provide a much improved description of the data
compared to a next-to-leading order calculation without energy conservation.
There is agreement between the data and calculations for the ratios of the
cumulant moments between gluon and quark jets.


title: Experimental determination of the b quark mass in DELPHI

abstract:
  The running mass of the b quark as defined in the MS-bar renormalization
scheme, m_b, was measured at the M_Z scale using 2.8 million hadronic Z^0
decays collected by the DELPHI experiment at LEP. The result is m_b(M_Z) = 2.67
+- 0.25 (stat.) +- 0.34 (frag.) +- 0.27(theo.) GeV/c^2 which differs from that
obtained at the Upsilon scale, by m_b(M_\Upsilon/2)-m_b(M_Z) = 1.49 +- 0.52
GeV/c^2. This measurement, performed far from the $b\bar{b}$ production
threshold, provides the first experimental observation of the running of the
quark masses.


title: Evidence for the Decay K+ --> pi+ nu anti-nu

abstract:
  An event consistent with the signature expected for the rare kaon decay K+
--> pi+ nu anti-nu has been observed. In the pion momentum region examined,
211<P<230 MeV/c, the backgrounds are estimated to contribute 0.08 +/- 0.03
events. If the event is due to K+ --> pi+ nu anti-nu, the branching ratio is
(4.2 +9.7/-3.5) x E-10.


title: The Photoproduction of the $b_1(1235)\pi$ System

abstract:
  We report on a study of the reaction, $\gamma p \to p
\pi^+\pi^+\pi^-\pi^-\pi^0$, at an incident photon energy of 19.3 GeV. The most
significant feature of this reaction is $\Delta^{++}$ production which occurs
with a cross section of $0.6\pm 0.1 \mu$b. An upper limit is set for the cross
section for the reaction, $\gamma p \to \Delta^{++}b_1^-(1235)$, and a search
is made for resonances decaying to $b_1^\pm\pi^\mp$.


title: Search for Color-Suppressed $B$ Hadronic Decay Processes with CLEO

abstract:
  Using 3.1 fb$^{-1}$ of data accumulated at the $\Upsilon$(4S) by the CLEO-II
detector, corresponding to 3.3 million $B\bar{B}$ pairs, we have searched for
the color-suppressed $B$ hadronic decay processes: $\bar{B}^0 \to D^0 (D^{*0})
X^0$, where $X^0$ is a light neutral meson $\pi^0$, $\rho^0$, $\eta$, $\eta'$
or $\omega$. No obvious signal is observed. We set 90 % C.L. upper limits on
these modes, varying from $1.2 \times 10^{-4}$ for $\bar{B}^0 \to D^0 \pi^0$ to
$1.9 \times 10^{-3}$ for $\bar{B}^0 \to D^{*0} \eta'$.


title:
A Study of Event Shapes and Determinations of alpha_s using data of
  e^+e^- Annihilations at sqrt{s} = 22 to 44 GeV

abstract:
  Data recorded by the JADE experiment at the PETRA e^+e^- collider were used
to measure the event shape observables thrust, heavy jet mass, wide and total
jet broadening and the differential 2-jet rate in the Durham scheme. For the
latter three observables, no experimental results have previously been
presented at these energies. The distributions were compared with resummed QCD
calulations (O(alpha_s^2)+NLLA), and the strong coupling constant alpha_s(Q)
was determined at different energy scales Q=sqrt{s}. The results,
  \alpha_s(22 GeV) = 0.161 ^{+0.016}_{-0.011},
  \alpha_s(35 GeV) = 0.143 ^{+0.011}_{-0.007},
  \alpha_s(44 GeV) = 0.137 ^{+0.010}_{-0.007}, are in agreement with previous
combined results of PETRA albeit with smaller uncertainties. Together with
corresponding data from LEP, the energy dependence of alpha_s is significantly
tested and is found to be in good agreement with the QCD expectation.
Similarly, mean values of the observables were compared to analytic QCD
predictions where hadronisation effects are absorbed in calculable power
corrections.


title: Investigation of Semileptonic $B$ Meson Decay to P-Wave Charm Mesons

abstract:
  We have studied semileptonic $B$ meson decays with a P-wave charm meson in
the final state using 3.29 x 10^6 B\bar{B} events collected by the CLEO~II
detector at the Cornell Electron-positron Storage Ring. We find a value for the
exclusive semileptonic product branching fraction: Br(B^- -> D_1^0 l^-
\bar{\nu}) x Br(D_1^0 -> D^{*+}\pi^-) = (0.373 \pm 0.085 \pm 0.052 \pm 0.024)%
and an upper limit for Br(B^- -> D_2^{*0} l^- \bar{\nu}) x Br(D_2^{*0} ->
D^{*+}\pi^-) < 0.16%$ (90% C.L.). These results indicate that at least 20% of
the total B^- semileptonic rate is unaccounted for by the observed exclusive
decays, B^- -> D^0 l^- \bar{\nu}, B^- -> D^{*0} l^- \bar{\nu}, B^- -> D_1^0 l^-
\bar{\nu}, and B^- -> D_2^{*0} l^- \bar{\nu}.


title: Combined QCD analysis of e^+ e^- data at sqrt(s) = 14 to 172 GeV

abstract:
  A study of the energy dependence of event shape observables is presented. The
strong coupling constant \alpha_s has been determined from the mean values of
six event shape observables. Power corrections, employed for the measurement of
\alpha_s, have been found to approximately account for hadronisation effects.


title:
Determinations of alpha_s using JADE data of e^+e^- Annihilations at
  sqrt{s} = 22 to 44 GeV

abstract:
  Data recorded by the JADE experiment at the PETRA e^+e^- collider were used
to measure distributions of new event shape observables. The distributions were
compared with resummed QCD calulations (O(alpha_s^2)+NLLA), and the strong
coupling constant alpha_s was determined at \sqrt{s}= 22, 35 and 44 GeV. The
results are in agreement with previous combined results of PETRA but have
smaller uncertainties. Together with corresponding data from LEP, the energy
dependence of alpha_s is significantly tested and is found to be in good
agreement with the QCD expectation.


title: Observation of Isolated High-ET Photons in Photoproduction at HERA

abstract:
  Events containing an isolated prompt photon with high transverse energy,
together with a balancing jet, have been observed for the first time in
photoproduction at HERA.The data were taken with the ZEUS detector, in a
$\gamma p$ centre of mass energy range 120--250 GeV. The fraction of the
incoming photon energy participating in the production of the prompt photon and
the jet, $x_\gamma$, shows a strong peak near unity, consistent with LO QCD
Monte Carlo predictions. In the transverse energy and pseudorapidity range
$5\le \eTg < 10$ GeV, $-0.7 \le \eta^\gamma < 0.8$, $\eTj\ge 5$ GeV, and
$-1.5\le \eta^{jet}\le 1.8$, with $\xgO > 0.8,$ the measured cross section is
$15.3 \pm 3.8 \pm 1.8 pb$, in good agreement with a recent NLO calculation.


title:
The Alpha Magnetic Spectrometer (AMS): search for antimatter and dark
  matter on the International Space Station

abstract:
  The AMS is a state of the art detector for extraterrestrial study of
antimatter, matter and missing matter. After a precursor flight on STS91 in May
1998, AMS will be installed on the International Space Station where it will
operate for three years. In this paper the AMS experiment is described and is
physics potential reviewed.


title:
Asymmetries Between the Production of Ds- and Ds+ Mesons from 500 GeV/c
  pi- Nucleon Interactions as Functions of x_F and square of p_t

abstract:
  This paper presents measurements of the production of Ds- mesons relative to
Ds+ mesons as functions of x_F and square of p_t for a sample of 2445 Ds decays
to phi pi. The Ds mesons were produced in Fermilab experiment E791 with 500
GeV/c pi- mesons incident on one platinum and four carbon foil targets. The
acceptance-corrected integrated asymmetry in the x_F range -0.1 to 0.5 for Ds+-
mesons is 0.032 +- 0.022 +- 0.022, consistent with no net asymmetry. The
results, as functions of x_F and square of p_t, are compared to predictions and
to the large production asymmetry observed for D+- mesons in the same
experiment. These comparisons support the hypothesis that production
asymmetries come from the fragmentation process and not from the charm quark
production itself.


title: Spin Analysis of the Process e+e- --> tau+tau- at LEP

abstract:
  Using the data collected by the four experiments at LEP during 1990-1994, a
precise measurement of the tau longitudinal polarisation (P_tau) has been
performed, as well as the measurement of the transverse-transverse and
transverse-normal tau spin correlations. From the P_tau measurement, assuming
lepton universality of the neutral currents, the effective weak mixing angle
has been determined to be sin(theta_W) = 0.2325 +- 0.0006. The Standard Model
predictions are consistent with the measured results.


title: Multi-photon final states in e^+e^- collisions at sqrt{s} = 130-172 GeV

abstract:
  The process e^+e^- -> gamma gamma (gamma) is studied using data recorded with
the OPAL detector at LEP. The data sample corresponds to a total integrated
luminosity of 25.38 pb^{-1} taken at centre-of-mass energies of 130-172 GeV.
The measured cross-sections agree well with the expectation from QED. In a
combined fit using data from all centre-of-mass energies, the angular
distribution is used to obtain improved limits on the cut-off parameters:
Lambda_+ > 195 GeV and Lambda_- > 210 GeV (95% CL). In addition, limits on
non-standard e^+e^-gamma couplings and contact interactions, as well as a 95%
CL mass limit for an excited electron, M_{e^*} > 194 GeV for an e^+e^-gamma
coupling kappa = 1, are determined.


title:
Search for the Standard Model Higgs Boson in e^+e^- Collisions at
  sqrt{s} = 161-172 GeV

abstract:
  This paper describes a search for the Standard Model Higgs boson using data
from e^+e^- collisions collected at center-of-mass energies of 161, 170 and 172
GeV by the OPAL detector at LEP. The data collected at these energies
correspond to integrated luminosities of 10.0, 1.0 and 9.4 pb^-1, respectively.
The search is sensitive to the main final states from the process in which the
Higgs boson is produced in association with a fermion anti-fermion pair, namely
four jets, two jets with missing energy, and two jets produced together with a
pair of electron, muon or tau leptons. One candidate event is observed, in
agreement with the Standard Model background expectation. In combination with
previous OPAL searches at center-of-mass energies close to the Z^0 resonance
and the revised previous OPAL searches at 161 GeV, we derive a lower limit of
69.4 GeV for the mass of the Standard Model Higgs boson at the 95% confidence
level.


title:
Measurement of the Inclusive Di-Jet Cross Section in Photoproduction and
  Determination of an Effective Parton Distribution in the Photon

abstract:
  The double-differential inclusive di-jet cross section in photoproduction
processes is measured with the H1 detector at HERA. The cross section is
determined as a function of the average transverse jet energy E_T^jets for
ranges of the fractional energy x_gamma^jets of the parton from the photon
side. An effective leading order parton distribution in the photon is
determined at large parton fractional energies for scales between 80<p_T^2<1250
GeV^2. The measurement is compatible with the logarithmic scale dependence that
is predicted by perturbative QCD.


title: CP-violating Parameter \epsilon_B in B_d^0-\bar{B}^0_d Mixing

abstract:
  We make an analysis of the phase-convention dependence of the CP-violating
parameter \epsilon_B and give some comments on the reported CLEO and OPAL
constraints on Re\epsilon_B. It is emphasized that \epsilon_B has little
advantage for the study of CP violation in the B^0_d-\bar{B}^0_d system.


title:
Measurement of the W Boson Mass and Production and Decay Properties in
  e^+e^- Collisions at sqrt{s} = 172 GeV

abstract:
  This paper describes the measurement of the W boson mass, M_W, and decay
width, Gamma_W, from the direct reconstruction of the invariant mass of its
decay products in W pair events collected at a mean centre-of-mass energy of
sqrt{s} = 172.12 GeV with the OPAL detector at LEP. Measurements of the W pair
production cross-section, the W decay branching fractions and properties of the
W decay final states are also described. A total of 120 candidate W^+W^- events
has been selected for an integrated luminosity of 10.36 pb^-1. The W^+W^-
production cross-section is measured to be sigma_WW = 12.3 +/- 1.3(stat.) +/-
0.3(syst.) pb, consistent with the Standard Model expectation. The W^+W^- ->
qq(bar) l nu and W^+W^- -> qq(bar)qq(bar) final states are used to obtain a
direct measurement of Gamma_W = 1.30^{+0.62}_{-0.55}(stat.) +/- 0.18(syst.)
GeV. Assuming the Standard Model relation between M_W and Gamma_W, the W boson
mass is measured to be M_W = 80.32 +/- 0.30(stat.) +/- 0.09(syst.) GeV. The
event properties of the fully-hadronic decays of W^+W^- events are compared to
those of the semi-leptonic decays. At the current level of precision there is
no evidence for effects of colour reconnection in the observables studied.
Combining data recorded by OPAL at sqrt{s} ~ 161-172 GeV, the W boson branching
fraction to hadrons is determined to be 69.8^{+3.0}_{-3.2}(stat.) +/-
0.7(syst.)%, consistent with the prediction of the Standard Model. The combined
mass measurement from direct reconstruction and from the W^+W^- production
cross-sections measured at sqrt{s} ~ 161 and sqrt{s} ~ 172 GeV is M_W = 80.35
+/- 0.24(stat.) +/- 0.07(syst.) GeV.


title: CP Violation in the K-System

abstract:
  CP violation in the K system is pedagogically reviewed. We discuss its
manifestations in the neutral K meson systems, in rare K meson decays and in
decays of charged K mesons. Results from classical experiments, and
perspectives for upcoming experiments are included. We also briefly discuss the
possibility of CPT tests.


title:
Hyperon polarization and vector meson production at 2.85 GeV
  (Preliminary Results)

abstract:
  Surprisingly large polarization in hyperon production by unpolarized proton
beam has been known since long time.
  Huge inclusive hyperon polarization data are available in literature, few
data are disponible on spin observables and none on exclusive hyperon
measurements. Evidence of relevant violation of the OZI rule in several
reactions are also shown in recent measurements.
  These two items, connected together by the hypothesis of existence of a
sizeable $q \bar{q}$ sea in the nucleon, can be studied using the DISTO is a
spectrometer installed in the polarized proton beam of the Saturne accelerator
in Saclay.
  The compact experimental set-up is designed to detect four or more charged
particles signaling $\Lambda$, $\Sigma^{0}$, $Y^{*}$ or $\phi$ production in
$\vec{p} p$ interaction.
  An outline of the physical motivations and a brief description of the
experimental apparatus is given as well as some preliminary results from the
first production running


title: Electroweak Measurements from Hadron Colliders

abstract:
  A review of recent electroweak results from hadron colliders is given.
Properties of the W and Z gauge bosons using final states containing electrons
and muons based on large integrated luminosities are presented. The emphasis is
placed on the measurement of the mass of the W boson and the measurement of
trilinear gauge boson couplings.


title: Results on alpha_s and QCD from (and Above) the Z0

abstract:
  Measurements of alpha_s from e+e- annihilation experiments are reviewed and
compared with measurements from other processes. Highlights are presented of
recent QCD studies in e+e- annihilation at the Z0 resonance.


title:
Untersuchungen zur Jet-Parton-Korrelation in der tief-inelastischen
  Streuung

abstract:
  The jet parton correlation has been studied for different cut scenarios and
various jet algorithms. These migrations are getting important for measuring
the strong coupling constant alpha_s and the NLO gluon density g(xi,Q^2) from
jet rates in DIS at HERA.


title:
Measurement of the Branching Fractions of $\Lambda_{c}^{+}\to
  p\bar{K}n(\pi)$

abstract:
  Using data recorded by the CLEO-II detector at CESR, we report new
measurements of the branching fractions for the decays of the charmed baryon
$\Lambda_c^+$ into $pK^-\pi^+\pi^0$, $p\bar{K}^0$, $p\bar{K}^0\pi^+\pi^-$, and
$p\bar{K}^0\pi^0$, all measured relative to $pK^-\pi^+$. The relative branching
fractions are $0.67\pm0.04\pm0.11, 0.46\pm0.02\pm0.04,0.52\pm0.04\pm0.05$, and
$0.66\pm0.05\pm0.07$ respectively.


title: Search for the pentaquark via the P^0_{{c bar}s} --> phi,pi,p decay

abstract:
  We report results of the first search for the pentaquark P_{{c bar}s} which
is predicted to be a doublet of states: P^0_{{c bar}s}=({c bar} s u u d) and
P^-_{{c bar}s}=({c bar} s d d u). A search was made for the decay P^0_{{c
bar}s} --> phi,pi,p in data from Fermilab experiment E791, in which 500 GeV/c
pi^- beam interacted with nuclear targets. We present upper limits at 90%
confidence level for the ratio of cross section times branching fraction of
this decay to that for the decay D_s --> phi,pi. The upper limits are 0.031 and
0.063 for M(P^0_{{c bar}s}) = 2.75 and 2.86 GeV/c^2, respectively, assuming a
P^0_{{c bar}s} lifetime of 0.4 ps.


title: Photoproduction of hadrons at HERA

abstract:
  New experimental results from photoproduction of hadrons at HERA are
reviewed.


title: Cross Section Measurements of Hard Diffraction at the SPS-Collider

abstract:
  The UA8 experiment previously reported the observation of jets in diffractive
events containing leading protons (``hard diffraction''), which was interpreted
as evidence for the partonic structure of an exchanged Reggeon, believed to be
the Pomeron . In the present Letter, we report the final UA8 hard-diffractive
(jet) cross section results and their interpretation. After corrections, the
fraction of single diffractive events with mass from 118 to 189 GeV that have
two scattered partons, each with Et_jet > 8 GeV, is in the range 0.002 to 0.003
(depending on x_p). We determine the product, fK, of the fraction by which the
Pomeron's momentum sum rule is violated and the normalization constant of the
Pomeron-Flux-Factor of the proton. For a pure gluonic- or a pure qqbar-Pomeron
, respectively: fK = 0.30 +- 0.05 +- 0.09) and (0.56 +- 0.09 +- 0.17) GeV^-2.


title: Properties of Jets in W Boson Events from 1.8 TeV pbar p Collisions

abstract:
  We present a study of events with W bosons and hadronic jets produced in pbar
p collisions at a center of mass energy of 1.8 TeV. The data consist of 51400
W^+/- -> e^+/- nu decay candidates from 108 pb^-1 of integrated luminosity
collected with the CDF detector at the Tevatron Collider. The cross sections
and jet production properties have been measured for W + \geq 1 to \geq 4 jet
events. The data are compared to predictions of leading order QCD matrix
element calculations with added gluon radiation and simulated fragmentation.


title: Low Q^2 Jet Production at HERA and Virtual Photon Structure

abstract:
  The transition between photoproduction and deep-inelastic scattering is
investigated in jet production at the HERA ep collider, using data collected by
the H1 experiment. Measurements of the differential inclusive jet
cross-sections dsigep/dEt* and dsigmep/deta*, where Et* and eta* are the
transverse energy and the pseudorapidity of the jets in the virtual
photon-proton centre of mass frame, are presented for 0 < Q2 < 49 GeV2 and 0.3
< y < 0.6. The interpretation of the results in terms of the structure of the
virtual photon is discussed. The data are best described by QCD calculations
which include a partonic structure of the virtual photon that evolves with Q2.


title: Scintillation Counters for the D0 Muon Upgrade

abstract:
  We present the results of an upgrade to the D0 muon system. Scintillating
counters have been added to the existing central D0 muon system to provide
rejection for cosmic ray muons and out-of-time background, and to provide
additional fast timing information for muons in an upgraded Tevatron.
Performance and results from the 1994-1996 Tevatron run are presented.


title:
First Results of Tokyo Dark Matter Search with a Lithium Fluoride
  Bolometer

abstract:
  The First results of the Tokyo dark matter search programme using a 21-g
lithium fluoride bolometer are presented. The background spectrum was measured
in the surface laboratory. We derive an exclusion plot for the spin-dependently
coupled Weakly Interacting Massive Particles (WIMPs) cross section.


title: Photon Structure at LEP

abstract:
  The structure of the photon is studied in photon interactions at high
energies using photons radiated by the electron and positron beams at LEP. The
current status of these measurements is reviewed.


title: Measurement of the Diffractive Structure Function F_2^D(4) at HERA

abstract:
  This paper presents the first analysis of diffractive photon dissociation
events in deep inelastic positron-proton scattering at HERA in which the proton
in the final state is detected and its momentum measured. The events are
selected by requiring a scattered proton in the ZEUS leading proton
spectrometer (LPS) with $\xl>0.97$, where $\xl$ is the fraction of the incoming
proton beam momentum carried by the scattered proton. The use of the LPS
significantly reduces the contamination from events with diffractive
dissociation of the proton into low mass states and allows a direct measurement
of $t$, the square of the four-momentum exchanged at the proton vertex. The
dependence of the cross section on $t$ is measured in the interval
$0.073<|t|<0.4$~$\gevtwo$ and is found to be described by an exponential shape
with the slope parameter $b=\tslopeerr$. The diffractive structure function
$\ftwodfour$ is presented as a function of $\xpom \simeq 1-\xl$ and $\beta$,
the momentum fraction of the struck quark with respect to $\xpom$, and averaged
over the $t$ interval $0.073<|t|<\ftwodfourtmax$~$\gevtwo$ and the photon
virtuality range $5<Q^2<20~\gevtwo$. In the kinematic range $4 \times 10^{-4} <
\xpom < 0.03$ and $0.015<\beta<0.5$, the $\xpom$ dependence of $\ftwodfour$ is
fitted with a form $\xpoma$, yielding $a= \ftwodfouraerr$. Upon integration
over $t$, the structure function $\ftwod$ is determined in a kinematic range
extending to higher $\xpom$ and lower $\beta$ compared to our previous
analysis; the results are discussed within the framework of Regge theory.


title: Search for a Massive Di-photon Resonance at sqrt{s} = 91-172 GeV

abstract:
  A search for the resonant production of high mass photon pairs associated
with a leptonic or hadronic system has been performed using a total data sample
of 25.7 pb^-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with
the OPAL detector at LEP. The observed number of events is consistent with the
expected number from Standard Model processes. The observed candidates are
combined with search results from sqrt{s} ~ M_Z to place limits on Br(H^0 ->
gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and
on the production cross section of any scalar resonance decaying into
di-photons. Upper limits on Br(H^0 -> gamma gamma) x sigma(e^+e^- -> H^0 Z^0)
of 290 - 830 fb are obtained over 40 < M_H < 160 GeV. Type-I two-Higgs-doublet
scalars which couple only to gauge bosons are ruled out up to a mass of 76.5
GeV at the 95% confidence level.


title:
Measurement of triple gauge boson couplings from W^+W^- production at
  sqrt{s} = 172 GeV

abstract:
  We present measurements of triple gauge boson coupling parameters using data
recorded by the OPAL detector at LEP2 at a centre-of-mass energy of 172 GeV. A
total of 120 W-pair candidates has been selected in the q q(bar) q q(bar), q
q(bar) l nu(bar)_l, and l nu(bar)_l l(bar)' nu_l' decay channels, for an
integrated luminosity of 10.4 pb^-1. We use these data to determine several
different anomalous coupling parameters using the measured cross-section and
the distributions of kinematic variables. We measure alpha_B-phi = 0.35 + 1.29
- 1.07 +/- 0.38, alpha_W-phi = 0.00 + 0.30 - 0.28 +/- 0.11, alpha_W = 0.18 +
0.49 - 0.47 +/- 0.23, Delta(g_1^z) = -0.03 + 0.40 -0.37 +/- 0.14,
Delta(kappa_gamma^(HISZ)) = 0.03 + 0.55 - 0.51 +/- 0.20, and Delta(kappa) =
0.03 + 0.49 - 0.46 +/- 0.21. Combining the alpha_W-phi result with our previous
result obtained from the 161 GeV data sample we measure alpha_W-phi = -0.08 +
0.28 - 0.25 +/- 0.10. All of these measurements are consistent with the
Standard Model.


title:
A search for non-qqbar mesons in the WA102 experiment at the CERN Omega
  Spectrometer

abstract:
  A study of central meson production as a function of the difference in
transverse momentum dPT of the exchanged particles shows that undisputed qqbar
mesons are suppressed at small dPT whereas the glueball candidates are
enhanced.


title: Hidden and Open Beauty in CUSB

abstract:
  We present a brief history and a summary of the physics results of CUSB at
CESR.


title:
An Expression of Interest to Detect and Measure the Dierct CP Violating
  Decay K_L --> pi0 nu nu_bar and Other Rare Decays at Fermilab Using the Main
  Injector

abstract:
  We, the KAMI (Kaons at the Main Injector) collaboration, express our interest
to continue the experimental program of rare kaon decay physics at Fermilab
using the Main Injector. KAMI's primary physics goals shall be:
  1. The first detection of the rare, direct CP violating decay K_L --> pi0 nu
nu_bar and measurement of its branching ratio with an accuracy of 10%,
corresponding to a measurement of the CP violating parameter eta with 5%
accuracy; and 2. Studies of various other rare decay processes such as K_L -->
pi0ee, pi0mumu, pi0mue, pi+pi-e+e-,mu+mu-,e+e-, etc. with sensitivities of
approximately 10E-13.


title:
Search for Unstable Heavy and Excited Leptons in e^+e^- Collisions at
  sqrt{s} = 170-172 GeV

abstract:
  We have searched for unstable neutral and charged heavy leptons, N and L^+/-,
and for excited states of neutral and charged leptons, nu*, e*, mu* and tau*,
in e^+e^- collisions at centre-of-mass energies of 170 and 172 GeV using the
OPAL detector at LEP. No evidence for their existence was found. From the
analysis of charged-current decays of pair-produced unstable heavy leptons, and
of charged-current and photonic decays of pair-produced excited leptons, lower
limits on their masses are derived. From the analysis of charged-current and
photonic decays of singly-produced excited leptons, upper limits on the ratio
of the coupling to the compositeness scale, f/Lambda, are determined for masses
up to the kinematic limit.


title:
Search for Light Gluinos via the Spontaneous Appearance of pi+pi- Pairs
  with an 800 GeV/c Proton Beam at Fermilab

abstract:
  We searched for the appearance of pi+pi- pairs with invariant mass greater
than 648 MeV in a neutral beam. Such an observation could signify the decay of
a long-lived light neutral particle. We find no evidence for this decay. Our
null result severely constrains the existence of an R0 hadron, which is the
lightest bound state of a gluon and a light gluino, and thereby also the
possibility of a light gluino. Depending on the photino mass, we exclude the R0
in the mass and lifetime ranges of 1.2 -- 4.6 GeV and 2E-10 -- 7E-4 seconds,
respectively. (To Appear in Phys. Rev. Lett.)


title: Jet Cross Sections and Jet Shapes in Photoproduction at HERA

abstract:
  Studies on the structure of the photon are presented by means of the
extraction of a leading order effective parton distribution in the photon and
measurements of inclusive jet differential cross sections in photoproduction.
Measurements of the internal structure of jets have been performed and are also
presented as a function of the transverse energy and pseudorapidity of the
jets.


title: Low-x hadronic final states at HERA

abstract:
  Measurements of the hadronic final state at HERA are reviewed, which aim at
the investigation of the parton dynamics of the proton at small Bjorken x.


title:
Recent Results from Investigations of Diffractive Vector Meson
  Production with the ZEUS Detector at HERA

abstract:
  We present results from recent investigations of diffractive vector meson
production using the ZEUS detector at HERA. These consist of measurements of
rho production in the region of photon virtuality 0.25 < Q^2 < 0.85 GeV^2, of
rho, phi, and J/psi production for values of the momentum transfer to the
proton 0.3 < |t| < 4.0 GeV^2, and of elastic J/psi production both in
photoproduction and for Q^2 > 2 GeV^2.


title: Searches for SUSY at LHC

abstract:
  One of the main motivations of experiments at the LHC is to search for SUSY
particles. The talk is based on recent analyses, performed by CMS
Collaboration, within the framework of the Supergravity motivated minimal SUSY
extension of the Standard Model. The emphasis is put on leptonic channels. The
strategies for obtaining experimental signatures for strongly and weakly
interacting sparticles productions, as well as examples of determination of
SUSY masses and model parameters are discussed. The domain of parameter space
where SUSY can be discovered is investigated. Results show, that if SUSY is of
relevance at Electro-Weak scale it could hardly escape detection at LHC.


title: Tabletop Experiment to Verify Magnetic Monopoles

abstract:
  Recently, we suggested a model of magnetic monopoles (hep-ph/9708394). Here
we will propose a tabletop experiment to test this model. The verification of
the predicted effect would have far-reaching consequences.


title:
Development of scintillating fiber detector technology for high rate
  particle tracking

abstract:
  The performance of a scintillating fiber detector prototype for tracking
under high rate conditions is investigated. A spatial resolution of about100
micron is aimed for the detector. Further demands are low occupancy and
radiation hardness up to 1 Mrad/year. Fibers with different radii and different
wavelengths of the scintillation light from different producers have been
extensively tested concerning light output, attenuation length and radiation
hardness, with and without coupling them to light guides of different length
and diameter.
  In a testrun at a 3 GeV electron beam the space dependent efficiency and
spatial resolution of fiber bundels were measured by means of two external
reference detectors with a precision of 50 micron. The light output profile
across fiber roads has been determined with the same accuracy.
  Different technologies were adopted for the construction of tracker modules
consisting of 14 layers of 0.5 mm fibers and 0.7 mm pitch. A winding technology
provides reliable results to produce later fiber modules of about 25 cm x 25 cm
area.
  We conclude that on the basis of these results a fiber tracker for high rate
conditions can be built.


title: Measurement of Jet Shapes in Photoproduction at HERA

abstract:
  The shape of jets produced in quasi-real photon-proton collisions at
centre-of-mass energies in the range $134-277$ GeV has been measured using the
hadronic energy flow. The measurement was done with the ZEUS detector at HERA.
Jets are identified using a cone algorithm in the $\eta - \phi$ plane with a
cone radius of one unit. Measured jet shapes both in inclusive jet and dijet
production with transverse energies $E^{jet}_T>14$ GeV are presented. The jet
shape broadens as the jet pseudorapidity ($\eta^{jet}$) increases and narrows
as $E^{jet}_T$ increases. In dijet photoproduction, the jet shapes have been
measured separately for samples dominated by resolved and by direct processes.
Leading-logarithm parton-shower Monte Carlo calculations of resolved and direct
processes describe well the measured jet shapes except for the inclusive
production of jets with high $\eta^{jet}$ and low $E^{jet}_T$. The observed
broadening of the jet shape as $\eta^{jet}$ increases is consistent with the
predicted increase in the fraction of final state gluon jets.


title: Search for Inclusive $b\to sl^{+]l^{-}$

abstract:
  We have searched for the effective FCNC decays b->s l+l- using an inclusive
method. We set upper limits on the branching ratios B(b->s e+e-) < 5.7 10^{-5},
B(b->s mu+mu-) < 5.8 10^{-5}, and B(b->s e+-mu-+) < 2.2 10^{-5} (at 90 %\
C.L.). Combining the di-electron and di-muon decay modes we find: B(b->s l+l-)
< 4.2 10^{-5} (at 90 % C.L.).


title:
Measurements of Single Diffraction at sqrt(s) = 630 GeV; Evidence for a
  Non-Linear alpha(t) of the Pomeron

abstract:
  We report measurements of the inclusive differential cross section for the
single-diffractive reactions: p + pbar --> p + X and p + pbar --> X + pbar at
sqrt(s) = 630 GeV, in the momentum transfer range, 0.8 < -t < 2.0 GeV^2 and
final state Feynman-x > 0.90. Based on the assumption of factorization, several
new features of the Pomeron Flux Factor are determined from simultaneous fits
to our UA8 data and lower energy data from the CHLM collaboration at the
CERN-Intersecting Storage Rings.
  Prominent among these is that the effective Pomeron Regge trajectory requires
a term quadratic in t, with coefficient, a'' = 0.079 +- 0.012 GeV^{-4}. We also
show that the data require a Pomeron-proton cross section that first decreases
with increasing diffractive mass (corresponding to the PPR term in the
triple-Regge expansion) and then increases at larger mass (the PPP term),
similar to real particle total cross sections. We measure the product, (K x
sigma0) = 0.72 +- 0.10 mb/GeV^2, where K is the normalization constant of the
Pomeron Flux Factor in the proton and sigma0 is the scale constant in the
Pomeron-proton total cross section. Finally, we report the occurence of ``beam
jets'' in the Pomeron direction in the rest frame of the diffractive system.


title: Total Hadronic Cross-Section for Photon-Photon Interactions at LEP

abstract:
  The total hadronic cross-section for the interaction of real photons is
extracted from a measurement of the cross-section of the process e+e->e+e- +
hadrons using a luminosity function for the photon flux and form factors for
extrapolating to Q**2=0. The data was taken with the OPAL detector at LEP at
e+e- centre-of-mass energies of 161 GeV and 172 GeV. In the energy range 10 < W
< 110 GeV the total hadronic photon-photon cross-section is consistent with the
Regge behaviour of the total cross-section observed in \gamma p and
hadron-hadron interactions.


title:
Confirmation of a soft photon signal in excess of Q.E.D. expectations in
  pi p interactions at 280 GeV/c

abstract:
  Photons produced in pi p interactions at 280 GeV/c were detected by
reconstructing the e+e- pairs produced via the materialisation of the photons
in a 1 mm thick lead sheet placed in front of the MWPCs of the OMEGA
spectrometer at CERN. A soft photon signal 7.8 +/- 1.5 times the Q.E.D. inner
bremsstrahlung prediction was observed confirming the results of a previous
experiment.


title:
Determination of the Mass of the W Boson Using the D0 Detector at the
  Tevatron

abstract:
  A measurement of the mass of the W boson is presented which is based on a
sample of 5982 W -> e nu decays observed in pbar-p collisions at sqrt(s) = 1.8
TeV with the D0 detector during the 1992-1993 run. From a fit to the transverse
mass spectrum, combined with measurements of the Z boson mass, the W boson mass
is measured to be M_W = 80.350+-0.140(stat)+-0.165(sys)+-0.160(scale) GeV/c^2.
Detailed discussions of the determination of the absolute energy scale, the
measured efficiencies, and all systematic uncertainties are presented.


title:
Measurement of the t-tbar Production Cross Section in p-pbar Collisions
  at sqrt(s)=1.8 TeV

abstract:
  We present a measurement of the t-tbar cross section in p-pbar collisions at
sqrt(s)=1.8 TeV using an integrated luminosity of 109 pb-1 collected with the
Collider Detector at Fermilab. The measurement uses t-tbar decays into final
states which contain one or two high transverse momentum leptons and multiple
jets, and final states which contain only jets. Using acceptances appropriate
for a top quark mass of 175 GeV/c^2, we find sigma(t-tbar)=7.6 (+1.8 -1.5) pb .


title:
Searches for Supersymmetry in the photon(s) plus missing energy channels
  at $\sqrt{s}$ = 161 GeV and 172 GeV

abstract:
  Searches for supersymmetric particles in channels with one or more photons
and missing energy have been performed with data collected by the ALEPH
detector at LEP. The data consist of 11.1 pb-1 at $\sqrt{s} = 161 GeV$, 1.1
pb-1 at 170 GeV and 9.5 pb-1 at 172 GeV. The e+e- -> nunu+photon cross section
is measured. The data are in good agreement with predictions based on the
Standard Model, and are used to set upper limits on the cross sections for
anomalous photon production. These limits are compared to two different SUSY
models and used to set limits on the neutralino mass. A limit of 71 GeV/c^2 at
95% C.L. is set on the mass of the lightest neutralino ($\tau_{\chi_{1}^{0}}
\leq $ 3 ns) for the gauge-mediated supersymmetry breaking and LNZ models.


title:
Search for Anomalous Production of Di-lepton Events with Missing
  Transverse Momentum in e^+e^- Collisions at sqrt{s} = 161 and 172 GeV

abstract:
  Events containing a pair of charged leptons and significant missing
transverse momentum are selected from a data sample corresponding to a total
integrated luminosity of 20.6 pb^-1 at centre-of-mass energies of 161 GeV and
172 GeV. The observed number of events, four at 161 GeV and nine at 172 GeV, is
consistent with the number expected from Standard Model processes,
predominantly arising from W+W- production with each W decaying leptonically.
This topology is also an experimental signature for the pair production of new
particles that decay to a charged lepton accompanied by one or more invisible
particles. Further event selection criteria are described that optimise the
sensitivity to particular new physics channels. No evidence for new phenomena
is observed and limits on the production of scalar charged lepton pairs and
other new particles are presented.


title:
Observation of Scaling Violations in Scaled Momentum Distributions at
  HERA

abstract:
  Charged particle production has been measured in deep inelastic scattering
(DIS) events over a large range of $x$ and $Q^2$ using the ZEUS detector. The
evolution of the scaled momentum, $x_p$, with $Q^2,$ in the range 10 to 1280
$GeV^2$, has been investigated in the current fragmentation region of the Breit
frame. The results show clear evidence, in a single experiment, for scaling
violations in scaled momenta as a function of $Q^2$.


title:
Searches for Charginos and Neutralinos in e+e- Collisions at sqrt(s) =
  161 and 172 GeV

abstract:
  The data recorded by the ALEPH detector at centre-of-mass energies of 161,
170, and 172 GeV are analysed for signals of chargino and neutralino
production. No evidence of a signal is found, although candidate events
consistent with the expectations from Standard Model processes are observed.
Limits at 95% C.L. on the production cross sections are derived and bounds on
the parameters of the Minimal Supersymmetric Standard Model are set. The lower
limit on the mass of the lightest chargino is 85.5 GeV/c^2 for gaugino-like
charginos (mu = -500 GeV/c^2), and 85.0 GeV/c^2 for Higgsino-like charginos
(M_2 = 500 GeV/c^2), for heavy sneutrinos (M(snu) > 200 GeV/c^2) and tanb =
sqrt(2). The effect of light sleptons on chargino and neutralino limits is
investigated. The assumptions of a universal slepton mass and a universal
gaugino mass are relaxed, allowing less model-dependent limits to be obtained.


title: Diffraction

abstract:
  This report summarizes recent results on diffraction obtained at HERA, at the
Tevatron and by the fixed target experiment E665. The measurements include
vector meson production, inclusive diffraction at HERA and the pomeron
structure function as inferred from the HERA and the Tevatron data.


title: Heavy Quark and Jet Production by Real and Virtual Photons

abstract:
  Recent results from the H1 and ZEUS collaborations on hard QCD processes in
ep interactions are reviewed. The topics cover jet shapes, the structure of
real and virtual photons, and the production of J/Psi mesons and open charm.


title: Search for Disoriented Chiral Condensates in 158 AGeV Pb+Pb Collisions

abstract:
  The restoration of chiral symmetry and its subsequent breaking through a
phase transition has been predicted to create regions of Disoriented Chiral
Condensates (DCC). This phenomenon has been predicted to cause anomalous
fluctuations in the relative production of charged and neutral pions in
high-energy hadronic and nuclear collisions. The WA98 experiment has been used
to measure charged and photon multiplicities in the central region of 158 AGeV
Pb+Pb collisions at the CERN SPS. In a sample of 212646 events, no clear DCC
signal can be distinguished. Using a simple DCC model, we have set a 90% C.L.
upper limit on the maximum DCC production allowed by the data.


title: Recent Electroweak Results from SLC/SLD

abstract:
  Key electroweak measurements performed by the SLD collaboration at the SLC
are described and recent results given. The left-right cross-section asymmetry,
$A_{LR}$, has been updated to include the 1996 data. It remains the single most
precise measurement of $\sin^2\theta_W^{eff}$, and it is compared to the LEP
results. The polarized differential cross section for $b$-quarks is measured
and is used to perform a unique direct measurement of the parity violation
parameter for $b$ quarks, $A_b$. The excellent capability to perform secondary
vertexing at SLC with CCD-based vertex detectors is described, including first
physics results with the new detector VXD3. The vertexing is used to full
advantage to make a highly pure B tag to measure the fraction of hadronic $Z^0$
decays going to $b$ quarks, $R_b$. The vertexing, in combination with
electron-beam polarization, is used to measure $B_d^0$ mixing. The prospects
for making a $B_s^0$ mixing measurement are excellent given good SLC
performance in the upcoming SLC run(s).


title: First Physical Results from SND Detector at VEPP-2M

abstract:
  The paper describes experiments with the SND detector at VEPP-2M collider,
carried out during the period from October 1995 until June 1997. The total
integrated luminosity of 6.4 pb^{-1} was collected in the energy range
2E=0.4-1.4 GeV (MHAD97 experiment), corresponding to 4*10^5 mu^+ mu^- pairs
produced. Preliminary results of the 1996 phi-meson experiment (FI96) are
presented. The total number of phi-mesons produced is 4*10^6. New data on rare
decays of phi and eta (550) mesons, in particular
  B(phi -> eta gamma) = (1.30+-0.06+-0.07)%,
  B(phi -> pi^0 pi^0 gamma) = (1.1+-0.2)*10^{-4}, (M_{pi^0 pi^0} > 800 MeV),
  B(phi -> f^0 gamma) = (4.7+-1.0)*10^{-4},
  B(phi -> eta pi^0 gamma) = (1.3+-0.5)*10^{-4},
  B(phi -> eta' gamma) < 1.7*10^{-4},
  B(phi -> 2 pi^0 ) < 6*10^{-4} were obtained.


title: Dijet Cross Sections in Photoproduction at HERA

abstract:
  Dijet cross sections are presented using photoproduction data obtained with
the ZEUS detector during 1994. These measurements represent an extension of
previous results, as the higher statistics allow cross sections to be measured
at higher jet transverse energy (ETJ). Jets are identified in the hadronic
final state using three different algorithms, and the cross sections compared
to complete next-to-leading order QCD calculations. Agreement with these
calculations is seen for the pseudorapidity dependence of the direct photon
events with ETJ > 6 GeV and of the resolved photon events with ETJ > 11 GeV.
Calculated cross sections for resolved photon processes with 6 GeV < ETJ < 11
GeV lie below the data.


title:
Searches for First Generation Leptoquark Pair Production in pbar-p
  Collisions at D0

abstract:
  We have searched for the pair production of first generation scalar
leptoquarks using the full data set (123 pb**-1) collected with the D0 detector
at the Fermilab Tevatron during 1992-1996. We observe no candidates, consistent
with the expected background. We combine these new results from the ee + jets
and enu + jets channels with the published nunu + jets result to obtain a 95%
CL upper limits on the LQ pair production cross section as a function of mass
and beta, the branching ratio to a charged lepton and a quark. Comparing to the
NLO theory predictions, we set 95% CL lower limits on the LQ mass of 225, 204,
and 79 GeV/c**2 for beta=1, 1/2, and 0, respectively. The results of this
analysis rule out an interpretation of the excess of high Q**2 events at HERA
as leptoquarks with LQ mass below 200 GeV/c**2 for values of beta > 0.4.


title: Hadronic Final States in Deep Inelastic Scattering at HERA

abstract:
  This lecture contains a brief introduction to HERA and deep inelastic
scattering (DIS), before going on to highlight some of the measurements of the
hadronic final state in DIS performed by the H1 and ZEUS collaborations.


title: CP Violation and Future `B-Factories'

abstract:
  This lecture contains a brief introduction to CP violation in the B system
before discussing future experimental programmes and their CP reach in the B
system.


title: Charged Higgs Boson Detector Aspects

abstract:
  The discovery potential for charged Higgs bosons has been studied including
background simulations for sqrts = 500 GeV and a luminosity of 10 fb-1
depending on the hadronic calorimeter resolution of a LC500 detector. The
hadronic decay channel H+H- --> cscs is in particular suited for this study due
to a large sensitivity dependence on the hadron calorimeter performance. For
this study a hadronic energy resolution as achieved at LEP experiments is
sufficient to reach a very good sensitivity. A calorimeter with weaker energy
resolution would reduce the sensitivity by a factor of two.


title: Search for the Decay $B\to D_{s1}^{+}(2536)X$

abstract:
  Using data recorded by the CLEO II detector at CESR, we have searched for the
decay B -> Ds1+(2536) X, where Ds1+ is the narrow P-wave D_s^+ meson with
J^P=1^+. The upper limit to the inclusive branching fraction is measured to be
Br(B -> Ds1+ X) < 0.95% at the 90% confidence level. This limit is small
compared with the total expected B -> Dbar(*)D(*)KX rate. Assuming
factorization, the Ds1+ decay constant is constrained to be f_Ds1 < 114 MeV at
the 90% confidence level, which is at least 2.5 times smaller than that of Ds+.


title: First observation of the Xi- pi+ decay mode of the Xi0(1690) hyperon

abstract:
  We report the first observation of the Xi- pi+ decay mode of the Xi0(1690),
confirming the existence of this resonance. The Xi0(1690) were produced by
Sigma- of 345 Gev/c mean momentum in copper and carbon targets. The mass and
width are close to those observed earlier for the Xi-(1690) in the Lambda K-
decay channel. The product of inclusive production cross section and branching
ratio is given relative to that of the Xi0(1530).


title: Results from Gamma-Gamma Collisions in OPAL

abstract:
  The production of charged hadrons and jets is measured in collisions of
quasi-real photons. The data were taken with the OPAL detector at LEP at e+e-
centre-of-mass energies of 161 and 172 GeV. The measured cross-sections are
compared to perturbative next-to-leading order QCD calculations. The separation
of the direct and the resolved component of the photon is demonstrated.


title: Updated measurement of the tau lepton lifetime

abstract:
  A new measurement of the mean lifetime of the tau lepton is presented. Three
different analysis methods are applied to a sample of 90000 tau pairs,
collected in 1993 and 1994 with the ALEPH detector at LEP. The average of this
measurement and those previously published by ALEPH is tau_tau = 290.1 +- 1.5
+- 1.1 fs.


title:
Event Shape Analysis of Deep Inelastic Scattering Events with a Large
  Rapidity Gap at HERA

abstract:
  A global event shape analysis of the multihadronic final states observed in
neutral current deep inelastic scattering events with a large rapidity gap with
respect to the proton direction is presented. The analysis is performed in the
range $5 \leq Q^2 \leq 185\gev^2$ and $160 \leq W \leq 250\gev$, where $Q^2$ is
the virtuality of the photon and $W$ is the virtual-photon proton centre of
mass energy. Particular emphasis is placed on the dependence of the shape
variables, measured in the $\gamma^*-$pomeron rest frame, on the mass of the
hadronic final state, $M_X$. With increasing $M_X$ the multihadronic final
state becomes more collimated and planar. The experimental results are compared
with several models which attempt to describe diffractive events. The
broadening effects exhibited by the data require in these models a significant
gluon component of the pomeron.


title: Flavor-Specific Inclusive B Decays to Charm

abstract:
  We have measured the branching fractions for B -> D_bar X, B -> D X, and B ->
D_bar X \ell^+ \nu, where ``B'' is an average over B^0 and B^+, ``D'' is a sum
over D^0 and D^+, and``D_bar'' is a sum over D^0_bar and D^-. From these
results and some previously measured branching fractions, we obtain Br(b -> c
c_bar s) = (21.9 $\pm$ 3.7)%, Br(b -> s g) < 6.8% @ 90% c.l, and Br(D^0 -> K^-
\pi^+) = (3.69 $\pm$ 0.20)%. Implications for the ``B semileptonic decay
problem'' (measured branching fraction being below theoretical expectations)
are discussed. The increase in the value of Br(b -> c c_bar s) due to $B -> D
X$ eliminates 40% of the discrepancy.


title:
A New Method for Selecting Exclusive Semileptonic Charmless B-Decays at
  $e^+ e^-$ Colliders at the $\Upsilon(4S)$

abstract:
  We introduce a new method for selecting exclusive semileptonic charmless
B-decays in the presence of a large background. The method can be applied to
charged and neutral B-mesons decaying into any exclusive neutral or charged
hadronic final state. The method is designed for high luminosity $\eplemi$
colliders operating at the $\Upsilon(4S)$. It employs an improved partial
reconstruction technique for $\Dstar$-mesons and a novel 0-C event fit to both
B-meson's decay products resulting in the kinematics of all particles
(including neutrinos) in the event. The charged lepton energies are accessible
from $1.0 \GeV$ to the kinematic limit.


title: QCD Tests at $e^+e^-$ Colliders

abstract:
  A short review of the history and a 'slide-show' of QCD tests in $e^+e^-$
annihilation is given. The world summary of measurements of $\alpha_s$ is
updated.


title:
Zgamma Production in pbarp Collisions at sqrt(s)=1.8 TeV and Limits on
  Anomalous ZZgamma and Zgammagamma Couplings

abstract:
  We present a study of Z +gamma + X production in p-bar p collisions at
sqrt{S}=1.8 TeV from 97 (87) pb^{-1} of data collected in the eegamma
(mumugamma) decay channel with the D0 detector at Fermilab. The event yield and
kinematic characteristics are consistent with the Standard Model predictions.
We obtain limits on anomalous ZZgamma and Zgammagamma couplings for form factor
scales Lambda = 500 GeV and Lambda = 750 GeV. Combining this analysis with our
previous results yields 95% CL limits |h{Z}_{30}| < 0.36, |h{Z}_{40}| < 0.05,
|h{gamma}_{30}| < 0.37, and |h{gamma}_{40}| < 0.05 for a form factor scale
Lambda=750 GeV.


title:
Search for First Generation Scalar Leptoquark Pairs in ppbar Collisions
  at sqrt(s)=1.8 TeV

abstract:
  We have searched for first generation scalar leptoquark (LQ) pairs in the
enu+jets channel using ppbar collider data (integrated luminosity= 115 pb^-1)
collected by the DZero experiment at the Fermilab Tevatron during 1992-96. The
analysis yields no candidate events. We combine the results with those from the
ee+jets and nunu+jets channels to obtain 95% confidence level (CL) upper limits
on the LQ pair production cross section as a function of mass and of beta, the
branching fraction to a charged lepton. Comparing with the next-to-leading
order theory, we set 95% CL lower limits on the LQ mass of 225, 204, and 79
GeV/c^2 for beta=1, 1/2, and 0, respectively.


title: Hyperon production asymmetries in 500 GeV/c pion nucleus interactions

abstract:
  We present a preliminary study from Fermilab experiment E791 of Lambda^0 /
Lambda^0 bar, Xi^- / Xi^+ and Omega^- /Omega^+ production asymmetries from pi^-
nucleus interactions at 500 Gev/c. The production asymmetries for these
particles are studied as a function of x_F and pt^2. We observed an asymmetry
in the target fragmentation region for Lambda^0's larger than that for Xi's,
suggesting diquark effects. The asymmetry for Omega's is significatively
smaller than for the other two hyperons consistent with the fact that Omega's
do not share valence quarks with either the pion or the target particle. In the
beam fragmentation region, the asymmetry tends to 0.1 for both Lambda^0's and
Xi's. The asymmetries vs pt^2 are approximately constant for the three strange
baryons under study.


title:
Charged Particle Production in Proton-, Deuteron-, Oxygen- and
  Sulphur-Nucleus Collisions at 200 GeV per Nucleon

abstract:
  The transverse momentum and rapidity distributions of net protons and
negatively charged hadrons have been measured for minimum bias proton-nucleus
and deuteron-gold interactions, as well as central oxygen-gold and
sulphur-nucleus collisions at 200 GeV per nucleon. The rapidity density of net
protons at midrapidity in central nucleus-nucleus collisions increases both
with target mass for sulphur projectiles and with the projectile mass for a
gold target. The shape of the rapidity distributions of net protons forward of
midrapidity for d+Au and central S+Au collisions is similar. The average
rapidity loss is larger than 2 units of rapidity for reactions with the gold
target. The transverse momentum spectra of net protons for all reactions can be
described by a thermal distribution with `temperatures' between 145 +- 11 MeV
(p+S interactions) and 244 +- 43 MeV (central S+Au collisions). The
multiplicity of negatively charged hadrons increases with the mass of the
colliding system. The shape of the transverse momentum spectra of negatively
charged hadrons changes from minimum bias p+p and p+S interactions to p+Au and
central nucleus-nucleus collisions. The mean transverse momentum is almost
constant in the vicinity of midrapidity and shows little variation with the
target and projectile masses. The average number of produced negatively charged
hadrons per participant baryon increases slightly from p+p, p+A to central
S+S,Ag collisions.


title:
Initial Results from the CHOOZ Long Baseline Reactor Neutrino
  Oscillation Experiment

abstract:
  Initial results are presented from CHOOZ, a long-baseline reactor-neutrino
vacuum-oscillation experiment. Electron antineutrinos were detected by a liquid
scintillation calorimeter located at a distance of about 1 km. The detector was
constructed in a tunnel protected from cosmic rays by a 300 MWE rock
overburden. This massive shielding strongly reduced potentially troublesome
backgrounds due to cosmic-ray muons, leading to a background rate of about one
event per day, more than an order of magnitude smaller than the observed
neutrino signal. From the statistical agreement between detected and expected
neutrino event rates, we find (at 90% confidence level) no evidence for
neutrino oscillations in the electron antineutrino disappearance mode for the
parameter region given approximately by deltam**2 > 0.9 10**(-3) eV**2 for
maximum mixing and (sin(2 theta)**2) > 0.18 for large deltam**2.


title:
Branching Fractions for D0 -> K+K- and D0 -> pi+pi-, and a Search for CP
  Violation in D0 Decays

abstract:
  Using the large hadroproduced charm sample collected in experiment E791 at
Fermilab, we have measured ratios of branching fractions for the two-body
singly-Cabibbo-suppressed charged decays of the D0:
  (D0 -> KK)/(D0 -> Kpi) = 0.109 +- 0.003 +- 0.003,
  (D0 -> pipi)/(D0 -> Kpi) = 0.040 +- 0.002 +- 0.003, and
  (D0 -> KK)/(D0 -> pipi) = 2.75 +- 0.15 +- 0.16. We have looked for
differences in the decay rates of D0 and D0bar to the CP eigenstates K+K- and
pi+pi-, and have measured the CP asymmetry parameters
  A_CP(K+K-) = -0.010 +- 0.049 +- 0.012 and
  A_CP(pi+pi-) = -0.049 +- 0.078 +- 0.030, both consistent with zero.


title:
Observation of Hadronic W Decays in t-tbar Events with the Collider
  Detector at Fermilab

abstract:
  We observe hadronic W decays in t-tbar -> W (-> l nu) + >= 4 jet events using
a 109 pb-1 data sample of p-pbar collisions at sqrt{s} = 1.8 TeV collected with
the Collider Detector at Fermilab (CDF). A peak in the dijet invariant mass
distribution is obtained that is consistent with W decay and inconsistent with
the background prediction by 3.3 standard deviations. From this peak we measure
the W mass to be 77.2 +- 4.6 (stat+syst) GeV/c^2. This result demonstrates the
presence of two W bosons in t-tbar candidates in the W (-> l nu) + >= 4 jet
channel.


title: The Structure of the Photon

abstract:
  The structure of the photon is studied in high energy photon-proton
interactions at HERA and photon-photon interactions at LEP. The status of these
measurements is reviewed.