title: The PHENIX Experiment at RHIC

abstract:
  The physics emphases of the PHENIX collaboration and the design and current
status of the PHENIX detector are discussed. The plan of the collaboration for
making the most effective use of the available luminosity in the first years of
RHIC operation is also presented.


title: The Forward Proton Detector at D0

abstract:
  We present the first results of detector R & D done for the proposed Forward
Proton Detector at D0. From a menu of options we have chosen a scintillating
fiber based detector with multi-anode photomultiplier readout.


title: The Charge Collection Properties of CVD Diamond

abstract:
  The charge collection properties of CVD diamond have been investigated with
ionising radiation. In this study two CVD diamond samples, prepared with
electrical contacts have been used as solid state ionisation chambers. The
diamonds have been studied with beta particles and 10 keV photons, providing a
homogeneous ionisation density and with protons and alpha particles which are
absorbed in a thin surface layer. For the latter case a strong decrease of the
signal as function of time is observed, which is attributed to polarisation
effects inside the diamond. Spatially resolved measurements with protons show a
large variation of the charge collection efficiency, whereas for photons and
minimum ionising particles the response is much more uniform and in the order
of 18%. These results indicate that the applicability of CVD diamond as a
position sensitive particle detector depends on the ionisation type and appears
to be promising for homogeneous ionisation densities as provided by
relativistic charged particles.


title: The AMANDA Neutrino Telescope and the Indirect Search for Dark Matter

abstract:
  With an effective telescope area of order 10^4 m^2, a threshold of ~50 GeV
and a pointing accuracy of 2.5 degrees, the AMANDA detector represents the
first of a new generation of high energy neutrino telescopes, reaching a scale
envisaged over 25 years ago. We describe its performance, focussing on the
capability to detect halo dark matter particles via their annihilation into
neutrinos.


title: Search for Millicharged Particles at SLAC

abstract:
  Particles with electric charge q < 10^(-3)e and masses in the range 1--100
MeV/c^2 are not excluded by present experiments. An experiment uniquely suited
to the production and detection of such "millicharged" particles has been
carried out at SLAC. This experiment is sensitive to the infrequent excitation
and ionization of matter expected from the passage of such a particle. Analysis
of the data rules out a region of mass and charge, establishing, for example, a
95%-confidence upper limit on electric charge of 4.1X10^(-5)e for millicharged
particles of mass 1 MeV/c^2 and 5.8X10^(-4)e for mass 100 MeV/c^2.


title: Detectors for Neutrino Physics at the First Muon Collider

abstract:
  We consider possible detector designs for short-baseline neutrino experiments
using neutrino beams produced at the First Muon Collider complex. The high
fluxes available at the muon collider make possible high statistics
deep-inelastic scattering neutrino experiments with a low-mass target. A design
of a low-energy neutrino oscillation experiment on the ``tabletop'' scale is
also discussed.


title:
A Small Target Neutrino Deep-Inelastic Scattering Experiment at the
  First Muon Collider

abstract:
  Several different scenarios for neutrino scattering experiments using a
neutrino beam from the muon collider complex are discussed. The physics reach
of a neutrino experiment at the front end of a muon collider is shown to extend
far beyond that of current neutrino experiments, since the high intensity
neutrino beams one would see at the muon collider allow for a large flexibility
in choosing neutrino targets. Measurements of quark spin, A-dependence of the
structure function $xF_3$ and neutral current chiral couplings to quarks are
outlined.


title: The D0 Detector at TeV33

abstract:
  The physics that can be done with 30 fb$^{-1}$ of data at the Tevatron
(TeV33) will significantly advance our understanding of particle physics. In
this document we consider the potential of the DO detector for running with the
TeV33 Collider. In that era, the instantaneous luminosity is expected to rise
by a factor of two to five. We show that the DO detector will perform well with
some relatively modest modifications.


title:
Multiplicity Structure of the Hadronic Final State in Diffractive
  Deep-Inelastic Scattering at HERA

abstract:
  The multiplicity structure of the hadronic system X produced in
deep-inelastic processes at HERA of the type ep -> eXY, where Y is a hadronic
system with mass M_Y< 1.6 GeV and where the squared momentum transfer at the pY
vertex, t, is limited to |t|<1 GeV^2, is studied as a function of the invariant
mass M_X of the system X. Results are presented on multiplicity distributions
and multiplicity moments, rapidity spectra and forward-backward correlations in
the centre-of-mass system of X. The data are compared to results in e+e-
annihilation, fixed-target lepton-nucleon collisions, hadro-produced
diffractive final states and to non-diffractive hadron-hadron collisions. The
comparison suggests a production mechanism of virtual photon dissociation which
involves a mixture of partonic states and a significant gluon content. The data
are well described by a model, based on a QCD-Regge analysis of the diffractive
structure function, which assumes a large hard gluonic component of the
colourless exchange at low Q^2. A model with soft colour interactions is also
successful.


title: Diffractive Dijet Cross Sections in Photoproduction at HERA

abstract:
  Differential dijet cross sections have been measured with the ZEUS detector
for photoproduction events in which the hadronic final state containing the
jets is separated with respect to the outgoing proton direction by a large
rapidity gap. The cross section has been measured as a function of the fraction
of the photon (x_gamma^OBS) and pomeron (beta^OBS) momentum participating in
the production of the dijet system. The observed x_gamma^OBS dependence shows
evidence for the presence of a resolved- as well as a direct-photon component.
The measured cross section d(sigma)/d(beta^OBS) increases as beta^OBS increases
indicating that there is a sizeable contribution to dijet production from those
events in which a large fraction of the pomeron momentum participates in the
hard scattering. These cross sections and the ZEUS measurements of the
diffractive structure function can be described by calculations based on parton
densities in the pomeron which evolve according to the QCD evolution equations
and include a substantial hard momentum component of gluons in the pomeron.


title: Observation of B_c Mesons in p-bar p Collisions at sqrt{s} = 1.8 TeV

abstract:
  We report the observation of bottom-charmed mesons B_c in 1.8 TeV p-bar p
collisions using the CDF detector at the Fermilab Tevatron. The B_c mesons were
found through their semileptonic decays, B_c -> J/psi lepton X. A fit to the
J/psi lepton mass distribution yielded 20.4 +6.2 -5.5 events from B_c mesons. A
test of the null hypothesis, i.e. an attempt to fit the data with background
alone, was rejected at the level of 4.8 standard deviations. By studying the
quality of the fit as a function of the assumed B_c mass, we determined M(B_c)
= 6.40 +- 0.39 +- 0.13 GeV/c^2. From the distribution of trilepton intersection
points in the plane transverse to the beam direction we measured the B_c
lifetime to be tau(B_c) = 0.46 +0.18 -0.16 +- 0.03 ps. We also measured the
ratio of production cross section times branching fraction for B_c -> J/psi
lepton neutrino relative to that for B+ -> J/psi K to be: 0.132 +0.041 -0.037
(stat) +- 0.031 (syst) +0.032 -0.020 (lifetime)


title: Penguin decays of B mesons

abstract:
  Penguin, or loop, decays of B mesons induce effective flavor-changing neutral
currents, which are forbidden at tree level in the Standard Model. These decays
give special insight into the CKM matrix and are sensitive to non-standard
model effects. In this review, we give a historical and theoretical
introduction to penguins and a description of the various types of penguin
processes: electromagnetic, electroweak, and gluonic. We review the
experimental searches for penguin decays, including the measurements of the
electromagnetic penguins b -> s gamma and B -> K* gamma and gluonic penguins B
-> K pi, B+ -> omega K+ and B -> eta' K, and their implications for the
Standard Model and New Physics. We conclude by exploring the future prospects
for penguin physics.


title:
Charge Determination of High Energy Electrons and Nuclei by Synchrotron
  Radiation with AMS

abstract:
  We investigate the possibilities to identify the charge of TeV electrons and
PeV nuclei using their synchrotron radiation in the earth's magnetic field.
Characteristics of synchrotron radiation photons are evaluated and methods of
detection are discussed.


title: D0 Findings on the Top Quark

abstract:
  Recent results on top quark physics with the D0 experiment in pbar-p
collisions at sqrt(s) = 1.8 TeV for an integrated luminosity of 125 pb**-1 are
reported. The direct measurement of the top quark mass uses single lepton and
dilepton events, giving the result m(top) = 172.1 +/- 7.1 GeV/c**2. The
measurement of the t-tbar production cross section includes analyses from 9 top
decay channels: dilepton (t-tbar --> e+mu, e+e, and mu+mu), electron and
neutrino (t-tbar --> e+nu), single leptons (t-tbar --> e + jets, t-tbar --> mu
+ jets) with and without b tagging, and all-jets (t-tbar --> 6 jets). We
measure the t-tbar production cross section to be 5.9 +/- 1.7 pb at m(top) =
172.1 GeV/c**2. Combining the D0 and the CDF measurements of the top quark mass
and combining their t-tbar cross sections, in both cases taking into account
error correlations, yields unofficially sigma(t-tbar) = 6.7 +/- 1.3 pb at an
averaged top quark mass of m(top) = 173.8 +/- 5.2 GeV/c**2. Preliminary results
on a search for charged Higgs production in top events, t --> Higgs + b, are
presented.


title: Observation of High Momentum $\eta'$ Production in B Decay

abstract:
  We report the first observation of $B\to \eta' X$ transitions with high
momentum $\eta'$ mesons. We observe $39.0\pm 11.6$ B decay events with $2.0<
p_{\eta'} < 2.7$ GeV/c, the high momentum region where background from $b\to c$
processes is suppressed. We discuss the physical interpretation of the signal,
including the possibility that it is due to $b\to s g^*$ transitions. Given
that interpretation, we find ${\cal B}(B\to \eta' X_s) = (6.2 \pm 1.6(stat) \pm
1.3(sys)^{+0.0}_{-1.5}(bkg))\times 10^{-4} $ for $2.0<p_{\eta'}<2.7$ GeV/c.


title: Development of a Large-Area Aerogel Cherenkov Counter Onboard BESS

abstract:
  This paper describes the development of a threshold type aerogel Cherenkov
counter with a large sensitive area of 0.6 m$^2$ to be carried onboard the BESS
rigidity spectrometer to detect cosmic-ray antiprotons. The design incorporates
a large diffusion box containing 46 finemesh photomultipliers, with special
attention being paid to achieving good performance under a magnetic field and
providing sufficient endurance while minimizing material usage. The refractive
index of the aerogel was chosen to be 1.03. By utilizing the muons and protons
accumulated during the cosmic-ray measurements at sea level, a rejection factor
of 10$^4$ was obtained against muons with $\beta \approx 1$, while keeping 97%
efficiency for protons below the threshold.


title: Electron-photon interactions in high energy beam production and cooling

abstract:
  In this review we consider three important applications of lasers in high
energy physics: gamma gamma, gamma electron colliders, laser cooling, positron
production. These topics are actual now due to plans of construction linear
e+e-, e-e-, gamma-gamma, gamma-e colliders with energies 0.3--1 TeV. High
energy photons for gamma-gamma, gamma-e collisions can be obtained using laser
backscattering. These types of collisions considerably increase physics
potential of linear colliders. Very low emittance of electron beams required
for achieving ultimate gamma-gamma luminosity can be obtained using a laser
cooling of electron beams. Combining a laser-electron Compton scattering with
subsequent conversion of these photons to e+e- pairs on the target (it can be a
laser target) one can get a nice source of polarized positron. In this paper,
we briefly consider these subjects with emphasis on underlying physics of
photon-electron interactions.

categories: hep-ex hep-ph physics.acc-ph physics.optics


title: Spin Physics with the PHENIX Detector System

abstract:
  The PHENIX experiment at RHIC has extended its scope to cover spin physics
using polarized proton beams. The major goals of the spin physics at RHIC are
elucidation of the spin structure of the nucleon and precision tests of the
symmetries. Sensitivities of the spin physics measurements with the PHENIX
detector system are reviewed.


title: Development of a Scintillatring Fibre Detector for HERA-B

abstract:
  A fibre detector with multianode PM readout for high rate applications was
developed for the HERA-B spectometer to cover the area near the beampipe. Such
a detector has to operate at particle rates up to 2*10**4 mm**(-2) s**(-1) and
has to tolerate a radiation dosis up to 1 Mrad/y. The light output of test
detectors with different scintillating fibres was measured as well as the light
transport through clear fibres to the PM as a function of radiation dosis and
different conditions of irradiation. The geometry of the detector is described
and results for a full size prototype are presented.


title:
Interconnection Effects in Multiparticle Production from WW Events at
  LEP

abstract:
  Interactions between the products of the hadronic decays of different Ws in
WW pair events can occur at several stages: from the colour rearrangement
between the quarks coming from the primary branching, to the gluon exchange
during the parton cascade, to the mixing of identical pions due to
Bose-Einstein correlations. Besides the intrinsic interest of their study
related to the understanding of the multiparticle production mechanisms, these
phenomena can affect the ultimate accuracy in the W mass measurement by LEP 2.
The status of the experimental analysis on interconnection effects between W
pairs hadronically decaying is reviewed in this paper.


title: Study of the atmospheric neutrino flux in the multi-GeV energy range

abstract:
  The flavor ratio of the atmospheric neutrino flux and its zenith angle
dependence have been studied in the multi-GeV energy range using an exposure of
25.5 kiloton-years of the Super-Kamiokande detector. By comparing the data to a
detailed Monte Carlo simulation, the ratio $(\mu/e)_{DATA}/(\mu/e)_{MC}$ was
measured to be $0.66\pm0.06(stat.)\pm0.08(sys.)$. In addition, a strong
distortion in the shape of the $\mu$-like event zenith angle distribution was
observed. The ratio of the number of upward to downward $\mu$-like events was
found to be 0.52$^{+0.07}_{-0.06}(stat.)\pm0.01(sys.)$, with an expected value
of $0.98\pm0.03(stat.)\pm0.02(sys.)$, while the same ratio for the $e$-like
events was consistent with unity.


title: Beauty97 Conference Summary

abstract:
  CP-violation is one of the least understood phenomena in our field. There are
major experimental programs in all high energy laboratories around the world
which will hopefully remedy this within the next decade. The study of
CP-violating effects in B meson decays will allow stringent tests of the
Standard Model to be made and may point the way to New Physics.
  The Beauty97 conference provided a forum for these experiments to discuss
their physics potential and experimental challenges relating to these studies.
This paper reviews the ongoing and future experimental B-physics projects. I
will summarize the status and future plans of these projects, as well as the
highlights of the physics and key R&D results presented at the conference. At
the end, a critical comparison of the CP-violation B experiments will be given.


title: Testing QCD in Photon-Photon Interactions

abstract:
  At high energies photon-photon interactions are dominated by quantum
fluctuations of the photons into fermion-antifermion pairs and into vector
mesons. This is called photon structure. Electron-positron collisions at LEP
are an ideal laboratory for studying photon structure and for testing QCD.


title: Determination of the Absolute Jet Energy Scale in the DZERO Calorimeters

abstract:
  The DZERO detector is used to study proton-antiproton collisions at the 1800
GeV and 630 GeV center-of-mass energies available at the Fermilab Tevatron. To
measure jets, the detector uses a sampling calorimeter composed of uranium and
liquid argon as the passive and active media respectively. Understanding the
jet energy calibration is not only crucial for precision tests of QCD, but also
for the measurement of particle masses and the determination of physics
backgrounds associated with new phenomena. This paper describes the energy
calibration of jets observed with the DZERO detector at the two
proton-antiproton center-of-mass energies in the transverse energy and
pseudorapidity range ET>8 GeV and pseudorapidity<3.


title: Dynamics of Multijet Processes in Photoproduction

abstract:
  The cross section for producing three high transverse energy jets with a
three-jet invariant mass of M_3J > 50 GeV has been measured in photoproduction
at HERA. The angular distribution of the three jets is presented and found to
be inconsistent with a uniform population of the available phase space. In
contrast, parton shower models and O(alpha alpha_s^2) pQCD calculations are
able to describe the three jet dynamics.


title: Photon and Light Meson Production in Hadronic Z^0 Decays

abstract:
  The inclusive production rates and differential cross-sections of photons and
mesons with a final state containing photons have been measured with the OPAL
detector at LEP. The light mesons covered by the measurements are the \pi^0,
\eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle
multiplicities per hadronic Z^0 decay, extrapolated to the full energy range,
are:
  <n_\gamma> = 20.97 +/- 0.02 +/- 1.15,
  <n_\pi^0> = 9.55 +/- 0.06 +/- 0.75,
  <n_\eta> = 0.97 +/- 0.03 +/- 0.11,
  <n_\rho^+-> = 2.40 +/- 0.06 +/- 0.43,
  <n_\omega> = 1.04 +/- 0.04 +/- 0.14,
  <n_\eta> = 0.14 +/- 0.01 +/- 0.02,
  <n_a_0+-> = 0.27 +/- 0.04 +/- 0.10.
  where the first errors are statistical and the second systematic. In general,
the results are in agreement with the predictions of the JETSET and HERWIG
Monte Carlo models.


title: Increased Sensitivity to Possible Muonium to Antimuonium Conversion

abstract:
  A new experimental search for muonium-antimuonium conversion was conducted at
the Paul Scherrer Institute, Villigen, Switzerland. The preliminary analysis
yielded one event fulfilling all required criteria at an expected background of
1.7(2) events due to accidental coincidences. An upper limit for the conversion
probability in 0.1 T magnetic field is extracted as $8 \cdot 10^{-11}$ (90%
CL).


title: The Muonium Atom as a Probe of Physics beyond the Standard Model

abstract:
  The observed interactions between particles are not fully explained in the
successful theoretical description of the standard model to date. Due to the
close confinement of the bound state muonium ($M = \mu^+ e^-$) can be used as
an ideal probe of quantum electrodynamics and weak interaction and also for a
search for additional interactions between leptons. Of special interest is the
lepton number violating process of sponteanous conversion of muonium to
antimuonium.


title:
Results from recent searches for muonium-- antimuonium conversion and
  future perspectives

abstract:
  A positive muon ($\mu^+$) and an electron ($e^-$) form the the hydrogen-like
muonium atom ($M$=$\mu^+ e^-$). Since it consists of two leptonic particles
which are according to present knowledge point-like, accurate calculations of
its level energies can be performed in the framework of standard theory. In
particular, the theoretical description of this system is possible almost
exclusively by Quantum Electrodynamics (QED) which has been verified in various
very high precision experiments. Due to the close confinement of the bound
state the muonium atom renders in addition the possibility for sensitive
searches for electron--muon interactions not included in the standard model.
Such exotic processes could affect the energy of the quantum states at a level
of the same order of magnitude as the precision achievable in modern
spectroscopic experiments.Oscillations between muonium and antimuonium
($\bar{M}$=$\mu^- e^+$) would violate separate additive lepton number
conservation which is a purely empirical law.


title: Searching New Physics in Muonium Atom

abstract:
  Quantum Electrodynamics describes electromagnetic interactions of free muons
and of muon and electron in the muonium atom to very high accuracy.
Contributions of other and yet unknown interactions can be investigated in
precision experiments, e.g. by searching for muonium-antimuonium conversion and
by measuring the muon magnetic anomaly.


title: Forward Jet Production in Deep Inelastic Scattering at HERA

abstract:
  The inclusive forward jet cross section in deep inelastic $e^+p$ scattering
has been measured in the region of $x$--Bjorken, ~$4.5 \cdot 10^{-4}$~ to ~$4.5
\cdot 10^{-2}$. This measurement is motivated by the search for effects of
BFKL--like parton shower evolution. The cross section at hadron level as a
function of \xbj is compared to cross sections predicted by various Monte Carlo
models. An excess of forward jet production at small \xbj is observed, which is
not reproduced by models based on DGLAP parton shower evolution. The Colour
Dipole model describes the data reasonably well. Predictions of perturbative
QCD calculations at the parton level based on BFKL and DGLAP parton evolution
are discussed in the context of this measurement.


title:
Search for Long-Lived Parents of Z Bosons in pbar-p Collisions at
  sqrt{s}=1.8 TeV

abstract:
  We search for new long-lived particles which decay to Z bosons by looking for
Z->e+e- decays with displaced vertices. We find no evidence for parent
particles of the Z with long lifetimes in 90 pb-1 of data from the CDF
experiment at Fermilab. We set a cross section limit as a function of the
lifetime of the parent particle for both a generic Z parent and a
fourth-generation, charge -1/3 quark that decays into Z+b.


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

abstract:
  The reaction pp to pfps(K+K-K+K-) in which the K+K-K+K- system is centrally
produced has been studied at 450 GeV/c. Phi phi production has been found to
dominate this reaction and is compatible with being produced by double Pomeron
exchange. An angular analysis of the phi phi system favours JPC = 2++ and its
dPT dependence is similar to that observed for glueball candidates.


title: Photon Structure in Photon Proton Interactions

abstract:
  Photoproduction of jets at HERA provides information on the partonic
structure of the photon. We report on the latest dijet photoproduction results,
for real photons and for photons at low virtualities, measured with the ZEUS
detector.


title: Measurement of Mw from LEP2

abstract:
  In 1997 each LEP experiment collected approximately 55 inv. pb of data at a
center-of-mass energy of 183 GeV. These data yield a sample of candidate e+e-
-> WW events from which the mass of the W boson, Mw, is measured. The LEP
combined result, including data taken at roots = 161 and 172 GeV and assuming
the Standard Model relation between the W decay width and mass, is
  Mw = 80.35 +/- 0.07 (exp) +/- 0.04 (CR) +/- 0.03 (E_beam) GeV, where the
errors correspond to experimental, colour-reconnection/Bose-Einstein, and LEP
beam energy uncertainties respectively.


title:
Measurements of the Solar Neutrino Flux from Super-Kamiokande's First
  300 Days

abstract:
  The first results of the solar neutrino flux measurement from
Super-Kamiokande are presented. The results shown here are obtained from data
taken between the 31st of May, 1996, and the 23rd of June, 1997. Using our
measurement of recoil electrons with energies above 6.5 MeV, we infer the total
flux of 8B solar neutrinos to be
2.42+-0.06(stat.)+0.10-0.07(syst.)*10^6/cm^2/s. This result is consistent with
the Kamiokande measurement and is 36% of the flux predicted by the BP95 solar
model. The flux is also measured in 1.5 month subsets and shown to be
consistent with a constant rate.


title:
B Physics at SLD: B+ and B0 Lifetimes, Bs Mixing, and Search for b -->
  sg Decays

abstract:
  We report new preliminary B Physics results obtained with 300,000 hadronic Z0
decays collected by the SLD experiment at the SLC between 1993 and 1997. Three
analyses are presented: a measurement of B+ and B0 lifetimes, a study of the
time dependence of Bs - Bs-bar mixing, and a search for decays of the type b
--> sg. All analyses benefit from the small and stable interaction point and
the excellent resolution and efficiency provided by the pixel-based CCD Vertex
Detector. The b --> sg analysis also exploits the particle identification
capabilities of the Cherenkov Ring Imaging Detector.


title: An Improved Test of the Flavor Independence of Strong Interactions

abstract:
  We present an improved comparison of the strong coupling of the gluon to
light (q_l=u+d+s), c, and b quarks, determined from multijet rates in
flavor-tagged samples of hadronic Z0 decays recorded with the SLC Large
Detector at the SLAC Linear Collider between 1993 and 1995. Flavor separation
among primary q_l q_l-bar, c c-bar, and b b-bar final states was made on the
basis of the reconstructed mass of long-lived heavy-hadron decay vertices,
yielding tags with high purity and low bias against >= 3-jet final states. We
find alpha_s^c/alpha_s^uds = 1.036+-0.043 (stat) +0.041-0.045 (syst)
+0.020-0.018 (theory) and alpha_s^b/alpha_s^uds = 1.004+-0.018 (stat)
+0.026-0.031 (syst) +0.018-0.029 (theory).


title: A Pilot Experiment with Reactor Neutrinos in Taiwan

abstract:
  A Collaboration comprising Taiwan and mainland Chinese scientists has been
built up since 1996 to pursue a experimental program in neutrino and
astro-particle physics in Taiwan. A pilot experiment to be performed at the
Nuclear Power Station II in Taiwan is now under intense preparation. It will
make use of a 600 kg CsI(Tl) crystal calorimeter to study various neutrino
interactions. The feasibility of performing a long baseline reactor neutrino
experiment will also be investigated. The conceptual design and the physics to
be addressed by the pilot experiment are presented.


title: Production of K^0_S and Lambda in Quark and Gluon Jets from Z^0 Decay

abstract:
  The production of K^0_S mesons and Lambda baryons in quark and gluon jets has
been investigated using two complementary techniques. In the first approach,
which provides high statistical accuracy, jets were selected using different
jet finding algorithms and ordered according to their energy. Production rates
were determined taking into account the dependences of quark and gluon
compositions as a function of jet energy as predicted by Monte Carlo models.
Selecting three-jet events with the k_perp (Durham) jet finder (y_cut = 0.005),
the ratios of K^0_S and Lambda production rates in gluon and quark jets
relative to the mean charged particle multiplicity were found to be 1.10 +/-
0.02 +/- 0.02 and 1.41 +/- 0.04 +/- 0.04, respectively, where the first
uncertainty is statistical and the second is systematic. In the second
approach, a new method of identifying quark jets based on the collimation of
energy flow around the jet axis is introduced and was used to anti-tag gluon
jets in symmetric (Y-shaped) three-jet events. Using the cone jet finding
algorithm with a cone size of 30 degrees, the ratios of relative production
rates in gluon and quark jets were determined to be 0.94 +/- 0.07 +/- 0.07 for
K^0_S and 1.18 +/- 0.10 +/- 0.17 for Lambda. The results of both analyses are
compared to the predictions of Monte Carlo models.


title:
Direct search for solar axions by using strong magnetic field and X-ray
  detectors

abstract:
  We have searched for axions which could be produced in the solar core by
exploiting their conversion to X rays in a strong laboratory magnetic field.
The signature of the solar axion is an increase in the rate of the X rays
detected in a magnetic helioscope when the sun is within its acceptance.
  From the absence of such a signal we set a 95% confidence level limit on the
axion coupling to two photons $g_{a\gamma\gamma}\equiv 1/M < 6.0\times
10^{-10}$ GeV$^{-1}$, provided the axion mass $m_a<0.03$ eV. The limit on the
coupling is factor 4.5 more stringent than the recent experimental result. This
is the first experiment whose sensitivity to $g_{a\gamma\gamma}$ is higher than
the limit constrained by the solar age consideration.


title: First Search for CP Violation in Tau Lepton Decay

abstract:
  Using the CLEO II detector we have performed the first search for $CP$
violation in tau lepton decay. CP violation in lepton decay does not occur in
the minimal standard model but can occur in extensions such as the multi-Higgs
doublet model. It appears as a characteristic difference between the $\tau^+$
and $\tau^-$ decay angular distributions for the semi-leptonic decay modes such
as $\tau^- \to K^0 \pi^- \nu$. We define an observable asymmetry to exploit
this and find no evidence for any CP violation.


title:
The comparison of characteristics of pi^{-} mesons produced in central
  Mg-Mg interactions with the quark gluon string model predictions

abstract:
  A detailed study of pion production in central Mg-Mg collisions at a momentum
of 4.3 GeV/c per incident nucleon was carried out with use of the setup GIBS.
The average kinematical characteristics of pions (multiplicity n_, momentum P,
transverse momentum P_{T}, emission angle Q, rapidity Y) and corresponding
distributions have been obtained. The experimental results have been compared
with the predictions of the Quark Gluon String Model (QGSM) and satisfactory
agreement between the experimental data and the model has been found. The QGSM
reproduces also the dependence of average P_{T} on n_{-}.
  The temperatures of pi^{-} mesons have been estimated in the rapidity
interval of 0.5<=Y<=2.1. A satisfactory fit for pi^{-} mesons has been achieved
by using a form involving two temperatures T_{1} and T_{2}. It was found that
the QGSM underestimates T_{2} by (10-15)%.
  The data have been analyzed using the transverse momentum technique. The
observed dependence of the <P_{x'}(Y)> on Y shows the S-shape behaviour. The
slope at midrapidity F had been determined. The QGSM reproduces the <P_{x}>
distribution satisfactorily, but underestimates the parameter F.


title:
Production of pi+, K+, K0, K*0, phi, p and Lambda-0 in Hadronic Z0
  Decays

abstract:
  We have measured the differential production cross sections as a function of
scaled momentum x_p=2p/E_cm of the identified hadron species pi+, K+, K0, K*0,
phi, p, Lambda0, and of the corresponding antihadron species in inclusive
hadronic Z0 decays, as well as separately for Z0 decays into light (u, d, s), c
and b flavors. Clear flavor dependences are observed, consistent with
expectations based upon previously measured production and decay properties of
heavy hadrons. These results were used to test the QCD predictions of Gribov
and Lipatov, the predictions of QCD in the Modified Leading Logarithm
Approximation with the ansatz of Local Parton-Hadron Duality, and the
predictions of three fragmentation models. Ratios of production of different
hadron species were also measured as a function of x_p and were used to study
the suppression of strange meson, strange and non-strange baryon, and vector
meson production in the jet fragmentation process. The light-flavor results
provide improved tests of the above predictions, as they remove the
contribution of heavy hadron production and decay from that of the rest of the
fragmentation process. In addition we have compared hadron and antihadron
production as a function of x_p in light quark (as opposed to antiquark) jets.
Differences are observed at high x_p, providing direct evidence that
higher-momentum hadrons are more likely to contain a primary quark or
antiquark. The differences for pseudoscalar and vector kaons provide new
measurements of strangeness suppression for high-x_p fragmentation products.


title:
Self-affine scaling from non-integer phase-space partition in $\pi^+$p
  and K$^+$p Collisions at 250 GeV/$c$

abstract:
  A factorial-moment analysis with real (integer and non-integer) phase space
partition is applied to $\pi^+$p and K$^+$p collisions at 250 GeV/$c$. Clear
evidence is shown for self-affine rather than self-similar power-law scaling in
multiparticle production. The three-dimensional self-affine second-order
scaling exponent is determined to be 0.061$\pm$0.010.


title: QCD at HERA

abstract:
  A review of HERA measurements of structure functions, fragmentation functions
and forward jet production is presented.


title:
Proposal to search for a monochromatic component of solar axions using
  $^{57}$Fe

abstract:
  An experimental method is introduced to search for almost monochromatic solar
axions. In this method, we can search for solar axions by exploiting the
axion-quark coupling, not relying on the axion-photon coupling at all. A recent
experimental result of Kr\v cmar is presented.


title:
Further Search for the Two-Photon Production of the Glueball Candidate
  $f_{J}(2220)$

abstract:
  The CLEOII detector at the Cornell e+ e- storage ring CESR has been used to
search for the two-photon production of the $f_J(2220)$ decaying into pi+ pi-.
No evidence for a signal is found in data corresponding to an integrated
luminosity of 4.77/fb and a 95% CL upper limit on $\Gamma_{two-photon} * BR{pi+
pi-}$ of 2.5 eV is set. If this result is combined with the BES Collaboration's
measurement of $f_J(2220) -> pi+ pi-$ in radiative $J/\psi$ decay, a 95% CL
lower limit on the stickiness of the $f_J(2220)$ of 73 is obtained. If the
recent CLEO result for $\Gamma_{two-photon} * BR{\K_S K_S}$ is combined with
the present result, the stickiness of the $f_J(2220)$ is found to be larger
than 102 at the 95% CL. These results for the stickiness (the ratio of the
probabilities for two-gluon coupling and two-photon coupling) provide further
support for a substantial neutral parton content in the $f_J(2220)$.


title: Observation of the B_c Meson in p-bar p Collisions at sqrt{s} = 1.8 TeV

abstract:
  We have observed bottom-charm mesons B_c via the decay mode Bc -> J/psi
lepton neutrino in 1.8 TeV p-bar p collisions using the CDF detector at the
Fermilab Tevatron. A fit of background and signal contributions to the J/psi +
lepton mass distribution yielded 20.4 +6.2 -5.5 events from B_c mesons. A fit
to the same distribution with background alone was rejected at the level of 4.8
standard deviations. We measured the B_c mass to be 6.40 +- 0.39 +- 0.13 GeVc^2
and the B_c lifetime to be tau(B_c) = 0.46 +0.18 -0.16 +- 0.03 ps. We measured
the production cross section times branching ratio for B_c -> J/psi lepton
neutrino relative to that for B+ -> J/psi K to be 0.132 +0.041 -0.037 (stat) +-
0.031 (syst) +0.032 -0.020 (lifetime).


title: Measurement of the Top Quark Mass

abstract:
  In this paper, we report on the most recent measurements of the top quark
mass, performed by the CDF and D0 collaborations at the Fermilab Tevatron. The
CDF collaboration has performed measurements of the top quark mass in three
decay channels from which the top quark mass is measured to be 175.6 +- 6.8
GeV/c^2. The D0 collaboration combines measurements from two decay channels to
obtain a top quark mass of 172.1 +- 7.1 GeV/c^2. Combining the measurements
from the two experiments, assuming a 2 GeV/c^2 correlated systematic
uncertainty, the measurement of the top quark mass at the Tevatron is 173.9 +-
5.2 GeV/c^2. This report presents the measurements of the top quark mass from
each of the decay channels which contribute to this measurement.


title:
Muon `Depth -- Intensity' Relation Measured by LVD Underground
  Experiment and Cosmic-Ray Muon Spectrum at Sea Level

abstract:
  We present the analysis of the muon events with all muon multiplicities
collected during 21804 hours of operation of the first LVD tower. The measured
angular distribution of muon intensity has been converted to the `depth --
vertical intensity' relation in the depth range from 3 to 12 km w.e.. The
analysis of this relation allowed to derive the power index, $\gamma$, of the
primary all-nucleon spectrum: $\gamma=2.78 \pm 0.05$. The `depth -- vertical
intensity' relation has been converted to standard rock and the comparison with
the data of other experiments has been done. We present also the derived
vertical muon spectrum at sea level.


title: Branching Fractions for $\psi(2S) to \gamma \eta'$ and $\gamma \eta$

abstract:
  We report the first measurements of the branching fractions: $B(\psi(2S) ->
\gamma \eta') = (1.54 \pm 0.31 \pm 0.23) x 10^{-4}$ and $B(\psi(2S) -> \gamma
\eta) = (0.53 \pm 0.31 \pm 0.08) x 10^{-4}$. The $\psi(2S)$ to $\gamma \eta'$
result is consistent with expectations of a model that considers the
possibility of $\eta' - \eta$ mixing. The ratio of the $\psi(2S)$ to $\gamma
\eta'$ and $\psi(2S)$ to $\gamma \eta$ rates is used to determine the
pseudoscalar octet-singlet mixing angle.


title: Lepton Flavour Violation Experiments -- Some Recent Developments

abstract:
  Dedicated experiments searching for lepton flavour violation can be performed
very sensitively using K-decays and $\mu$-decays as well as neutrinoless double
$\beta$-decay and muonium to antimuonium conversion. Although there is no
confirmed signal reported yet, stringent limits for parameters in speculative
extensions to the standard model can be set. Some models could recently be
ruled out.


title:
Measurements of the W Boson Mass and Trilinear Gauge Boson Couplings at
  the Tevatron

abstract:
  We present measurements of the W boson mass at the Tevatron based on $W \to
\mu \nu$ events collected by CDF and $W \to e \nu$ events observed by D0 in Run
Ib (1994--95). The W boson mass measured in the preliminary CDF analysis is
80.43 \pm 0.10 (stat) \pm 0.12 (syst) GeV/c^2. The D0 measured value is 80.44
\pm 0.10 (stat) \pm 0.07 (syst) GeV/c^2. We also describe measurements of the
trilinear gauge boson couplings. The limits obtained on the WW\gamma and WWZ
anomalous couplings from a combined D0 analysis using $W\gamma$, $WW \to \ell
\nu \ell^\prime \nu^\prime$, and $WW/WZ \to e \nu jj$ production are: -0.30 <
\Delta\kappa < 0.43, -0.20 < \lambda < 0.20, and -0.52 < \Delta g^Z_1 < 0.78,
for a dipole form factor scale of 2 TeV. Improved limits have been obtained by
combining these results with the limits derived from the LEP experiments.


title: Review of W and Z Production at the Tevatron

abstract:
  The CDF and \D0 collaborations have used recent data taken at the Tevatron to
perform QCD tests with $W$ and $Z$ bosons decaying leptonically. \D0 measures
the production cross section times branching ratio for $W$ and $Z$ bosons. This
also gives an indirect measurement of the total width of the $W$ boson:
$\gw=2.126\pm0.092 GeV$. CDF reports on a direct measurement of
$\gw=2.19\pm0.19 GeV$, in good agreement with the indirect determination and
Standard Model predictions. \D0's measurement of the differential
$d\sigma/dp_T$ distribution for $W$ and $Z$ bosons decaying to electrons agrees
with the combined QCD perturbative and resummation calculations. In addition,
the $d\sigma/dp_T$ distribution for the $Z$ boson discriminates between
different vector boson production models. Studies of $W+ Jet$ production at CDF
find the NLO QCD prediction for the production rate of $W+\ge1 Jet$ events to
be in good agreement with the data.


title:
Beam-Induced Nuclear Depolarisation in a Gaseous Polarised Hydrogen
  Target

abstract:
  Spin-polarised atomic hydrogen is used as a gaseous polarised proton target
in high energy and nuclear physics experiments operating with internal beams in
storage rings. When such beams are intense and bunched, this type of target can
be depolarised by a resonant interaction with the transient magnetic field
generated by the beam bunches. This effect has been studied with the HERA
positron beam in the HERMES experiment at DESY. Resonances have been observed
and a simple analytic model has been used to explain their shape and position.
Operating conditions for the experiment have been found where there is no
significant target depolarisation due to this effect.


title: Search for the decay K_L-> pi^0 nu nubar

abstract:
  We report on a search for the rare decay K_L -> pi^0 nu nubar in the KTeV
experiment at Fermilab. We searched for two-photon events whose kinematics were
consistent with an isolated pi^0 coming from the decay K_L -> pi^0 nu nubar.
One candidate event was observed, which was consistent with the expected level
of background. An upper limit on the branching ratio was determined to be B(K_L
-> pi^0 nu nubar) < 1.6E-6 at the 90% confidence level.


title: The HERMES Spectrometer

abstract:
  The HERMES experiment is collecting data on inclusive and semi-inclusive deep
inelastic scattering of polarised positrons from polarised targets of H, D, and
He. These data give information on the spin structure of the nucleon. This
paper describes the forward angle spectrometer built for this purpose. The
spectrometer includes numerous tracking chambers (micro-strip gas chambers,
drift and proportional chambers) in front of and behind a 1.3 T.m magnetic
field, as well as an extensive set of detectors for particle identification (a
lead-glass calorimeter, a pre-shower detector, a transition radiation detector,
and a threshold Cherenkov detector). Two of the main features of the
spectrometer are its good acceptance and identification of both positrons and
hadrons, in particular pions. These characteristics, together with the purity
of the targets, are allowing HERMES to make unique contributions to the
understanding of how the spins of the quarks contribute to the spin of the
nucleon.


title:
Observation of Events with an Isolated High Energy Lepton and Missing
  Transverse Momentum at HERA

abstract:
  A search for events with an imbalance in transverse momentum and with
isolated high energy leptons has been carried out at the positron-proton
collider HERA. One event with an e^- and five events with a mu^+- are found
together with evidence for undetected particles carrying transverse momentum.
Within the Standard Model the dominant origin of events with this kind of
topology is the production of W bosons with subsequent leptonic decay. Three of
the six events are within measurement errors found in a region of phase space
likely to be populated by this process, while the remaining events show
kinematic properties which are atypical of all Standard Model processes
considered.


title: Recent HERA Results and Future Prospects

abstract:
  A few selected HERA results are presented and the prospects for future
measurements with high luminosity are discussed, which will become available
after the planned luminosity upgrade of the HERA storage ring planned for 2000.


title: New New-Phenomena Results from Dzero

abstract:
  We have searched for diphoton events (\ggmet) with large missing transverse
momentum, $\gamma\rlap{\kern0.25em/}E_T$ events (\gmetjj) with two or more
jets, and diphoton events ($\gamma\gamma$) with high transverse energies in
$p\bar p$ collisions at $\sqrt{s} = 1.8$ TeV using approximately 100~pb$^{-1}$
of data collected with the D\O detector at the Fermilab Tevatron in 1992--1996.
No excess of events beyond the expected backgrounds is observed. The null
results are interpreted in supersymmetric models with a dominant
$\tilde\chi^0_2\to\gamma\tilde\chi^0_1$ decay and in terms of Dirac pointlike
monopole production.


title:
Determination of the J/psi Leptonic Branching Fraction via psi(2S) ->
  pi^+ pi^- J/psi

abstract:
  A comparison of the rates for psi(2S) -> pi^+ pi^- J/psi, J/psi -> l^+l^- and
J/psi -> anything is used to determine the J/psi leptonic branching fractions.
The results are B(J/psi -> e^+e^-) = (5.90 +/- 0.05 +/- 0.10)% and B(J/psi ->
mu^+ mu^-) = (5.84 +/- 0.06 +/- 0.10)%, where the first error is statistical
and the second is systematic. Assuming lepton universality, the leptonic
branching fraction of the J/psi is B(J/psi -> l^+ l^-) = (5.87 +/- 0.04 +/-
0.09)% per species. This result is used to estimate the QCD scale factor
Lambda_MSbar and the strong coupling constant alpha_s.


title: Measurement of sin2thetaW from Neutrino-Nucleon Scattering at NuTeV

abstract:
  We report the measurement of sin2thetaW in neutrino-nucleon deep inelastic
scattering from the NuTeV experiment. Using separate neutrino and anti-neutrino
beams, NuTeV is able to determine sin2thetaW with low systematic errors by
measuring the Paschos-Wolfenstein variable R-minus, a ratio of differences of
neutrino and anti-neutrino neutral-current and charged-current cross-sections.
NuTeV measures sin2thetaW(on-shell)= 0.2253+/-0.0019(stat)+/-0.0010(syst),
which implies a W mass of 80.26+/-0.11 GeV.


title:
Search for Proton Decay via p -> e+ pi0 in a Large Water Cherenkov
  Detector

abstract:
  We have searched for proton decay via p -> e+ pi0 using data from a 25.5
kton-year exposure of the Super-Kamiokande detector. We find no candidate
events with an expected background induced by atmospheric neutrinos of 0.1
events. From these data, we set a lower limit on the partial lifetime of the
proton to be 1.6E33 years at a 90% confidence level.


title: The Tokyo Axion Helioscope Experiment

abstract:
  A preliminary result of the solar axion search experiment at the University
of Tokyo is presented. We searched for axions which could be produced in the
solar core by exploiting the axion helioscope. The helioscope consists of a
superconducting magnet with field strength of 4 Tesla over 2.3 meters. From the
absence of the axion signal we set a 95 % confidence level upper limit on the
axion coupling to two photons $g_{a\gamma\gamma} < 6.0 \times 10^{-10}
GeV^{-1}$ for the axion mass $m_a < 0.03$ eV. This is the first solar axion
search experiment whose sensitivity to $g_{a\gamma\gamma}$ exceeds the limit
inferred from the solar age consideration.


title:
Forward pi^0 -Meson and Charged Particle Production in Deep Inelastic
  Scattering at low Bjorken-x

abstract:
  High transverse momentum pi^0 -mesons and charged particles are measured in
deep inelastic e-p scattering events at low Bjorken-x taken with the H1
detector at HERA. The production of high-pt particles is strongly correlated to
the emission of hard partons in QCD and is therefore sensitive to the dynamics
of the strong interaction. For the first time the measurement of single
particles has been extended to the region of small angles w.r.t. the proton
remnant (forward region). This region is expected to be particularly sensitive
to QCD evolution effects in final states. Results are presented as a function
of Bjorken-x and x_i, the fraction of the incident proton's energy carried by
the particle, and are compared to different QCD models.


title:
Measurements of the reaction $\bar{p}p \to \phi \eta$ of antiproton
  annihilation at rest at three hydrogen target densities

abstract:
  The proton-antiproton annihilation at rest into the $\phi\eta$ final state
was measured for three different target densities: liquid hydrogen, gaseous
hydrogen at NTP and at a low pressure of 5 mbar. The yield of this reaction in
the liquid hydrogen target is smaller than in the low-pressure gas target. The
branching ratios of the $\phi\eta$ channel were calculated on the basis of
simultaneous analysis of the three data samples. The branching ratio for
annihilation into $\phi\eta$ from the $^3S_1$ protonium state turns out to be
about ten times smaller as compared to the one from the $^1P_1$ state.


title:
Improved Measurement of the B- and B0-bar Meson Lifetimes Using
  Semileptonic Decays

abstract:
  The lifetimes of the B- and B0-bar mesons are measured using the partially
reconstructed semileptonic decays B-bar -> D l- nu-bar X, where D is either a
D0 or D*+ meson. The data were collected by the CDF detector at the Fermilab
Tevatron collider during 1992-95 and correspond to about 110 pb-1 of p-bar p
collisions at sqrt(s)=1.8 TeV. We measure decay lengths and extract the
lifetimes to be tau(B-) = 1.637 +/- 0.058 +0.045 -0.043 ps, tau(B0) = 1.474 +/-
0.039 +0.052 -0.051 ps, and the ratio of the lifetimes to be tau(B-)/tau(B0) =
1.110 +/- 0.056 +0.033 -0.030, where the first uncertainties are statistical
and the second are systematic.


title: Search for Selectron and Squark Production in $e^+p$ Collisions at HERA

abstract:
  We have searched for the production of a selectron and a squark in $e^+p$
collisions at a center-of-mass energy of 300 GeV using the ZEUS detector at
HERA. The selectron and squark are sought in the direct decay into the lightest
neutralino in the framework of supersymmetric extensions to the Standard Model
which conserve R-parity. No evidence for the production of supersymmetric
particles has been found in a data sample corresponding to 46.6~pb$^{-1}$ of
integrated luminosity. We express upper limits on the product of the cross
section times the decay branching ratios as excluded regions in the parameter
space of the Minimal Supersymmetric Standard Model.


title: Scale Issues in High-Energy Diffractive Vector-Meson Production

abstract:
  Recent measurements of diffractive vector-meson production with the
general-purpose detectors H1 and ZEUS in electron-proton interactions with 300
GeV center-of-mass energy at the HERA accelerator complex have stimulated great
interest in the question of whether perturbative QCD (pQCD) can provide an
accurate description of such diffractive processes. The high flux of quasi-real
photons from the 27.5 GeV electron beam has allowed high-statistics studies of
vector-meson photoproduction to be compared to the deeply inelastic processes
at high photon virtuality Q^2 >> \Lambda^2_QCD. Special-purpose electron
detectors at small scattering angle have been used to identify a transition
region, 0.2 < Q^2 < 2 GeV^2, where the pQCD prediction for the dominance of
point-like configurations of qqbar-pairs is verified. Data samples
characterized by high momentum transfer to the 820 GeV initial-state proton, 1
< |t| < 13 GeV^2, have now become available, and the results lend support to
the proposition that pQCD calculations should accurately describe the inelastic
vector-meson production processes in high-|t| photoproduction. Measurements of
the energy dependence and the t-dependence of the elastic cross sections for
rho, omega, phi, and J/psi production have provided tests of the proposal that
the mass (or size) of the vector meson provides a third scaling variable for
studying the transition to the domain of pQCD applicability. A preliminary
result on elastic upsilon production has also been announced by the ZEUS
collaboration. These issues of scale will be discussed in the context of
topical phenomenological models, comparing the HERA results and those from
fixed-target experiments at lower energy to the wealth of calculations
available in the contemporary literature.


title: Total Cross Section Measurements in gamma-p and gammastar-p at HERA

abstract:
  Measurements of the total cross section for real and virtual photons on
protons at center-of-mass energies in the range from 20 GeV to 270 GeV with
photon virtualities up to 5000 GeV^2 are presented. For real photons this cross
section can be described by Regge-motivated models while for virtual photons
perturbative QCD can be applied. The measurements of the two HERA collider
experiments ZEUS and H1 open the possibility to investigate the interplay
between the two theoretical approaches in the transition region as well as the
high-energy behavior of the cross sections. The results of total cross section
measurements are discussed in the above context.


title: Observation of Z Decays to b Quark Pairs at the Tevatron Collider

abstract:
  A search for Z boson decays to pairs of b-quark jets has been performed in
the full dataset collected with the CDF detector at the Tevatron
proton-antiproton collider. After the selection of a pure sample of bb events
by means of the identification of secondary vertices from b-quark decays, we
have used two kinematic variables to further discriminate the electroweak bb
production from QCD processes, and sought evidence for the Z decay in the dijet
invariant mass distribution. An absolute background prediction allows the
extraction of an excess of events inconsistent with the background predictions
by 3.23 sigma but in good agreement with the amount and characteristics of the
expected signal. We then fit the mass distribution with an unbinned likelihood
technique, and obtain a Z -> bb signal amounting to 91+-30+-19 events.


title:
Measurements of the longitudinal structure function and |V_cs| in the
  CCFR experiment

abstract:
  Measurements of charged current neutrino and anti-neutrino nucleon
interactions in the CCFR detector are used to extract the structure functions,
F_2, xF_3(nu), xF_3(nubar) and R(longitudinal) in the kinematic region
0.01<x<0.6 and 1<Q^2<300 GeV^2. The new measurements of R in the x<0.1 region
provide a constraint on the level of the gluon distribution. The x and Q^2
dependence of R is compared with a QCD based fit to previous data. The CKM
matrix element |V_cs| is extracted from a combined analysis of xF_3 and dimuon
data.


title:
Measurement of the energy spectrum of \nu_e from muon decay and
  implications for the Lorentz structure of the weak interaction

abstract:
  The KARMEN experiment uses the reaction 12C(\nu_e,e-)12N to measure the
energy distribution of \nu_e emitted in muon decay at rest. The \nu_e analog
\omega_l of the famous Michel parameter \rho has been derived from a
maximum-likelihood analysis of events near the kinematic end point, E_max. The
result, \omega_l = (2.7^{+3.8}_{-3.3}\pm 3.1) * 10^{-2}, is in good agreement
with the standard model prediction \omega_l= 0. We deduce a 90% confidence
upper limit of \omega_l <= 0.113, which corresponds to a limit of |g^S_RL + 2
g^T_RL| <= 0.78 on the interference term between scalar and tensor coupling
constants.


title:
Measurement of the CP-Violation Parameter $\sin(2\beta)$ in
  $B^0_d/\bar{B}{^0_d} \to J/\psi K^0_S$ Decays

abstract:
  We present a measurement of the time-dependent asymmetry in the rate for
$\bar{B}{^0_d}$ versus $B^0_d$ decays to $J/\psi K^0_S$. In the context of the
Standard Model this is interpreted as a measurement of the CP-violation
parameter $\sin(2\beta)$. A total of $198\pm 17$ $B^0_d/\bar{B}{^0_d}$ decays
were observed in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV by the CDF
detector at the Fermilab Tevatron. The initial $b$-flavor is determined by a
same side flavor tagging technique. Our analysis results in $\sin(2\beta) =
1.8\pm 1.1(stat)\pm 0.3(syst)$.


title:
Measurement of the $B^0_d - \bar{B}{^0_d}$ flavor oscillation frequency
  and study of same side flavor tagging of B mesons in $p\bar p$ collisions

abstract:
  $B^0_d$-$\bar{B}{}^0_d$ oscillations are observed in ``self-tagged'' samples
of partially reconstructed $B$ mesons decaying into a lepton and a charmed
meson collected in $p\bar p$ collisions at $\sqrt{s} = 1.8$ TeV. A flavor
tagging technique is employed which relies upon the correlation between the
flavor of $B$ mesons and the charge of nearby particles. We measure the flavor
oscillation frequency to be $\Delta m_d = 0.471 ^{+0.078}_{-0.068} \pm 0.034
ps^{-1}$. The tagging method is also demonstrated in exclusive samples of
$B^+_u \to J/\psi K^+$ and $B^0_d \to J/\psi K^{*0}(892)$, where similar
flavor-charge correlations are observed. The tagging characteristics of the
various samples are compared with each other, and with Monte Carlo simulations.


title: Fermion-pair Production above the Z and Search for New Phenomena

abstract:
  A review of the measurements of hadron, flavour-tagged and lepton-pair
production cross-sections and lepton-pair forward-backward asymmetries
performed by the four LEP experiments ALEPH, DELPHI, L3 and OPAL at energies
between 130 and 183 GeV is given. All 183 GeV results are preliminary. The
searches by the four collaborations for new physics phenomena like contact
interactions and compositeness, exchange of R-parity violating sneutrinos or
squarks, leptoquarks or additional heavy gauge bosons Z' are summarized. No
evidence for deviations from the Standard Model expectations is found and new
or improved limits are derived.


title:
Differential (2+1) Jet Event Rates and Determination of alpha_s in Deep
  Inelastic Scattering at HERA

abstract:
  Events with a (2+1) jet topology in deep-inelastic scattering at HERA are
studied in the kinematic range 200 < Q^2< 10,000 GeV^2. The rate of (2+1) jet
events has been determined with the modified JADE jet algorithm as a function
of the jet resolution parameter and is compared with the predictions of Monte
Carlo models. In addition, the event rate is corrected for both hadronization
and detector effects and is compared with next-to-leading order QCD
calculations. A value of the strong coupling constant of alpha_s(M_Z^2)=
0.118+- 0.002 (stat.)^(+0.007)_(-0.008) (syst.)^(+0.007)_(-0.006) (theory) is
extracted. The systematic error includes uncertainties in the calorimeter
energy calibration, in the description of the data by current Monte Carlo
models, and in the knowledge of the parton densities. The theoretical error is
dominated by the renormalization scale ambiguity.


title: Di-jet Event Rates in Deep-Inelastic Scattering at HERA

abstract:
  Di-jet event rates have been measured for deep-inelastic scattering in the
kinematic domain ~5 < Q^2 < ~100 GeV^2 and ~10^(-4) < x_Bj < ~10^(-2), and for
jet transverse momenta squared p_t^2 > ~Q^2. The analysis is based on data
collected with the H1 detector at HERA in 1994 corresponding to an integrated
luminosity of about 2 pb^(-1). Jets are defined using a cone algorithm in the
photon-proton centre of mass system requiring jet transverse momenta of at
least 5 GeV. The di-jet event rates are shown as a function of Q^2 and x_Bj.
Leading order models of point-like interacting photons fail to describe the
data. Models which add resolved interacting photons or which implement the
colour dipole model give a good description of the di-jet event rate. This is
also the case for next-to-leading order calculations including contributions
from direct and resolved photons.


title:
Strange Sea and alpha-s Measurements from nu-N Deep Inelastic Scattering
  at CCFR/NuTeV

abstract:
  We present the latest Next-to-Next-Leading order strong coupling constant,
alpha-s, extracted from Gross-Llewellyn-Smith sum rule. The value of alpha-s
from this measurement, at the mass of Z boson, is
alpha-s^{NNLO}(M_Z**2)=0.114^{+0.009}_{-0.012}. We discuss the previous strange
sea quark measurement from the CCFR experiment and the prospects for
improvements of the measurement in the NuTeV experiment.


title: Recent QCD results in nu-N Deep Inelastic Scattering at CCFR/NuTeV

abstract:
  We present recent QCD results in nu-N scattering at the Fermilab CCFR/NuTeV
experiments. We present the latest Next-to-Next-Leading order strong coupling
constant, alpha-s, extracted from Gross-Llewellyn-Smith sum rule. The value of
alpha-s from this measurement, at the mass of Z boson, is
alpha-s^{NNLO}(M_Z**2)=0.114^{+0.009}_{-0.012}. We also present a preliminary
result of the CCFR F_2 at large-x. This measurement of F_2 is compared to other
experiments and various models that provide nuclear effects. We discuss the
previous strange sea quark measurement from the CCFR experiment and the
prospects for improvements of the measurement in the NuTeV experiment.


title:
Precision Measurement of sin^2theta_W from nu-N Scattering at NuTeV and
  Direct Measurements of M_W

abstract:
  We present the preliminary result of sin^2theta_W from nu-N deep inelastic
scattering experiment, NuTeV, at Fermilab. This measurement of sin^2theta_W
comes from measuring the Paschos-Wolfenstein parameter
R-=sigma_NC^nu-sigma_NC^nubar/(sigma_CC^{nu}-sigma_CC^nubar), using separate
beams of nu and nubar, utilizing the SSQT. The resulting value of
sin^2\theta_W^(on-shell) is $0.2253\pm0.0019(stat)\pm0.0010(syst)$. This value
is equivalent to the mass of the W boson, M_W=80.26\pm0.11 GeV/c^2. We also
summarize the direct measurements of M_W from the Tevatron pbar-p collider
experiments, D\O and CDF. Combining these two direct measurements yields
M_W=80.37\pm0.08 GeV/c^2.


title: DIS Prospects at the Future Muon Collider Facility

abstract:
  We discuss prospects of deep inelastic scattering physics capabilities at the
future muon collider facility. In addition to mu^+ mu^- collider itself, the
facility provides other possibilities. Among the possibilities, we present
muon-proton collider and neutrino fixed target programs at the muon collider
facility. This mu-p collider program extends kinematic reach and luminosity by
an order of magnitude, increasing the possibility of search for new exotic
particles. Perhaps most intriguing DIS prospects come from utilizing high
intensity neutrino beam resulting from continuous decays of muons in various
sections of the muon collider facility. One of the most interesting findings is
a precision measurement of electroweak mixing angle, sin^2theta_W, which can be
achieved to the precision equivalent to delta M_W ~ 30 MeV.


title:
Searches for New Physics in Diphoton Events in proton anti-proton
  collisions at sqrt(s)=1.8TeV

abstract:
  We present a detailed description of a search for anomalous production of
missing E_T ($\mett$), jets, leptons ($e, \mu, \tau$), b-quarks, or additional
photons in events containing two isolated, central ($|\eta|<1.0$) photons with
$\Et > 12$ GeV}. The results are consistent with standard model expectations,
with the possible exception of one event that has in addition to the two
photons a central electron, a high-E_T electromagnetic cluster, and large
$\mett$. We set limits using two specific SUSY scenarios for production of
diphoton events with $\mett$.


title:
An upper limit for the tau-neutrino mass from tau --> 5 pi+- nu_tau
  decays

abstract:
  An upper limit for the tau-neutrino mass has been determined from the decay
tau -> 5pi+- \nu_tau using data collected with the OPAL detector from 1991 to
1995 in e+e- collisions at \sqrt{s} ~ M_Z. A limit of 43.2 MeV at 95% CL is
obtained using a two-dimensional method in the 5pi invariant mass and energy
distribution from 22 selected events. Combining this result with OPAL's
previously published measurement using tau+tau- -> 3h+- \bar{nu}_tau 3h-+
\nu_tau decays, a new combined limit of m_{nu_tau} < 27.6 MeV (95% CL) is
obtained.


title: Bose-Einstein Correlations of Three Charged Pions in Hadronic Z^0 Decays

abstract:
  Bose-Einstein Correlations (BEC) of three identical charged pions were
studied in 4 x 10^6 hadronic Z^0 decays recorded with the OPAL detector at LEP.
The genuine three-pion correlations, corrected for the Coulomb effect, were
separated from the known two-pion correlations by a new subtraction procedure.
A significant genuine three-pion BEC enhancement near threshold was observed
having an emitter source radius of r_3 = 0.580 +/- 0.004 (stat.) +/- 0.029
(syst.) fm and a strength of \lambda_3 = 0.504 +/- 0.010 (stat.) +/- 0.041
(syst.). The Coulomb correction was found to increase the \lambda_3 value by
\~9% and to reduce r_3 by ~6%. The measured \lambda_3 corresponds to a value of
0.707 +/- 0.014 (stat.) +/- 0.078 (syst.) when one takes into account the
three-pion sample purity. A relation between the two-pion and the three-pion
source parameters is discussed.


title: Delbr\"uck scattering at energies 140 - 450 MeV

abstract:
  The differential cross section of Delbr\"{u}ck scattering is measured on a
bismuth germanate $Bi_4Ge_3O_{12}$ target at photon energies $140 - 450 MeV$
and scattering angles $2.6 - 16.6 mrad$. A good agreement with the theoretical
results, obtained exactly in a Coulomb field, is found.


title:
Measurement of the flux and zenith-angle distribution of upward
  through-going muons in Kamiokande II+III

abstract:
  The flux of upward through-going muons of minimum (mean) threshold energy >
1.6 (3.0) GeV is measured, based on a total of 372 events observed by the
Kamiokande II+III detector during 2456 detector live days. The observed muon
flux was (1.94+-0.10(stat.)+0.07-0.06(sys.))*10^-13 /cm^2/s/sr, which is
compared to an expected value of (2.46+-0.54(theo.))*10^-13/cm^2/s/sr. The
observation is in agreement with the prediction within the errors. The zenith
angle dependence of the observed upward through-going muons supports the
previous indication of neutrino oscillations made by Kamiokande using sub- and
multi-GeV atmospheric neutrino events.


title: Study of the P-wave charmonium state \chi_{cJ} in \psi(2S) decays

abstract:
  The processes $\psi(2S)\to \gamma \pi^+ \pi^-$, $\gamma K^+ K^-$ and $\gamma
p \bar{p}$ have been studied using a sample of $3.7 \times 10^6$ produced
$\psi(2S)$ decays. We determine the total width of the $\chi_{c0}$ to be
$\Gamma^{tot}_{\chi_{c0}} = 14.3\pm 2.0\pm 3.0$ MeV. We present the first
measurement of the branching fraction $B(\chi_{c0} \to p \bar{p}) = (16.3 \pm
4.4 \pm 5.4)\times 10^{-5}$, where the first error is statistical and the
second one systematic. Branching fractions of $\chi_{c0,2} \to \pi^+ \pi^-$ and
$K^+ K^-$ are also reported.


title: CDF Searches for New Phenomena

abstract:
  We present results of recent searches for new physics using the CDF detector
at the Fermilab Tevatron. Presented are searches for Higgs -> gammagamma, as
well as more general searches in gammagamma + X where X is missing Et, jets,
charged leptons, b-quarks or extra photons. The CDF eegammagamma-mett candidate
event is discussed along with estimates of the expected rates in the Standard
Model. Other searches for SUSY, Higgs and Technicolor look for particles which
decay to vector bosons and b-quarks.


title: Evidence for oscillation of atmospheric neutrinos

abstract:
  We present an analysis of atmospheric neutrino data from a 33.0 kiloton-year
(535-day) exposure of the Super-Kamiokande detector. The data exhibit a zenith
angle dependent deficit of muon neutrinos which is inconsistent with
expectations based on calculations of the atmospheric neutrino flux.
Experimental biases and uncertainties in the prediction of neutrino fluxes and
cross sections are unable to explain our observation. The data are consistent,
however, with two-flavor nu_mu <-> nu_tau oscillations with sin^2(2theta)>0.82
and 5x10^-4 < delta m^2 < 6x10^-3 eV^2 at 90% confidence level.


title:
Measurements of Flavour Dependent Fragmentation Functions in Z^0 ->
  qq(bar) Events

abstract:
  Fragmentation functions for charged particles in Z -> qq(bar) events have
been measured for bottom (b), charm (c) and light (uds) quarks as well as for
all flavours together. The results are based on data recorded between 1990 and
1995 using the OPAL detector at LEP. Event samples with different flavour
compositions were formed using reconstructed D* mesons and secondary vertices.
The \xi_p = ln(1/x_E) distributions and the position of their maxima \xi_max
are also presented separately for uds, c and b quark events. The fragmentation
function for b quarks is significantly softer than for uds quarks.


title:
Measurement of the atmospheric neutrino-induced upgoing muon flux using
  MACRO

abstract:
  We present a measurement of the flux of neutrino-induced upgoing muons
(<E_nu>~100 GeV) using the MACRO detector. The ratio of the number of observed
to expected events integrated over all zenith angles is 0.74 +/- 0.036 (stat)
+/- 0.046(systematic) +/- 0.13 (theoretical). The observed zenith distribution
for -1.0 < cos(theta) < -0.1 does not fit well with the no oscillation
expectation, giving a maximum probability for chi^2 of 0.1%. The acceptance of
the detector has been extensively studied using downgoing muons, independent
analyses and Monte-Carlo simulations. The other systematic uncertainties cannot
be the source of the discrepancies between the data and expectations. We have
investigated whether the observed number of events and the shape of the zenith
distribution can be explained by a neutrino oscillation hypothesis. Fitting
either the flux or zenith distribution independently yields mixing parameters
of sin^2 (2theta)=1.0 and delta m^2 of a few times 10^-3 eV^2. However, the
observed zenith distribution does not fit well with any expectations giving a
maximum probability for chi^2 of 5% for the best oscillation hypothesis, and
the combined probability for the shape and number of events is 17%. We conclude
that these data favor a neutrino oscillation hypothesis, but with unexplained
structure in the zenith distribution not easily explained by either the
statistics or systematics of the experiment.


title:
Observation of the Shadowing of Cosmic Rays by the Moon using a Deep
  Underground Detector

abstract:
  Using data collected by the MACRO experiment during the years 1989-1996, we
show evidence for the shadow of the moon in the underground cosmic ray flux
with a significance of 3.6 sigma. This detection of the shadowing effect is the
first by an underground detector. A maximum-likelihood analysis is used to
determine that the angular resolution of the apparatus is 0.9+/-0.3 degrees.
These results demonstrate MACRO's capabilities as a muon telescope by
confirming its absolute pointing ability and quantifying its angular
resolution.


title:
Measurement of C-Parameter and Determinations of alpha_s from
  C-Parameter and Jet Broadening at PETRA Energies

abstract:
  e^+e^- annihilation data recorded by the JADE detector at PETRA were used to
measure the C-parameter for the first time at sqrt{s}= 35 and 44 GeV. The
distributions were compared to a resummed QCD calculation which recently became
available for this observable. % In addition, we applied extended resummed
calculations to the heavy and wide jet broadening variables, B_T and B_W, which
now include a proper treatment of the quark recoil against multi-gluon emission
with single-logarithmic accuracy. % We further investigated power corrections
to the mean values of the observables mentioned above. In this study, we
considered all available e^+e^- data between sqrt{s}= 35 and 172 GeV.


title:
Measurement of inclusive D*+- and associated dijet cross sections in
  photoproduction at HERA

abstract:
  Inclusive photoproduction of D*+- mesons has been measured for photon-proton
centre-of-mass energies in the range 130 < W < 280 GeV and a photon virtuality
Q^2 < 1 GeV^2. The data sample used corresponds to an integrated luminosity of
37 pb^-1. Total and differential cross sections as functions of the D*
transverse momentum and pseudorapidity are presented in restricted kinematical
regions and the data are compared with next-to-leading order (NLO) perturbative
QCD calculations using the "massive charm" and "massless charm" schemes. The
measured cross sections are generally above the NLO calculations, in particular
in the forward (proton) direction. The large data sample also allows the study
of dijet production associated with charm. A significant resolved as well as a
direct photon component contribute to the cross section. Leading order QCD
Monte Carlo calculations indicate that the resolved contribution arises from a
significant charm component in the photon. A massive charm NLO parton level
calculation yields lower cross sections compared to the measured results in a
kinematic region where the resolved photon contribution is significant.


title:
Measurement of the energy spectrum of underground muons at Gran Sasso
  with a transition radiation detector

abstract:
  We have measured directly the residual energy of cosmic ray muons crossing
the MACRO detector at the Gran Sasso Laboratory. For this measurement we have
used a transition radiation detector consisting of three identical modules,
each of about 12 m^2 area, operating in the energy region from 100 GeV to 1
TeV. The results presented here were obtained with the first module collecting
data for more than two years. The average single muon energy is found to be 320
+/- 4 (stat.) +/- 11 (syst.) GeV in the rock depth range 3000-6500 hg/cm^2. The
results are in agreement with calculations of the energy loss of muons in the
rock above the detector.


title:
Measurement of the Diffractive Cross Section in Deep Inelastic
  Scattering using ZEUS 1994 Data

abstract:
  The DIS diffractive cross section, $d\sigma^{diff}_{\gamma^* p \to XN}/dM_X$,
has been measured in the mass range $M_X < 15$ GeV for $\gamma^*p$ c.m.
energies $60 < W < 200$ GeV and photon virtualities $Q^2 = 7$ to 140 GeV$^2$.
For fixed $Q^2$ and $M_X$, the diffractive cross section rises rapidly with
$W$, $d\sigma^{diff}_{\gamma^*p \to XN}(M_X,W,Q^2)/dM_X \propto W^{a^{diff}}$
with $a^{diff} = 0.507 \pm 0.034 (stat)^{+0.155}_{-0.046}(syst)$ corresponding
to a $t$-averaged pomeron trajectory of $\bar{\alphapom} = 1.127 \pm 0.009
(stat)^{+0.039}_{-0.012} (syst)$ which is larger than $\bar{\alphapom}$
observed in hadron-hadron scattering. The $W$ dependence of the diffractive
cross section is found to be the same as that of the total cross section for
scattering of virtual photons on protons. The data are consistent with the
assumption that the diffractive structure function $F^{D(3)}_2$ factorizes
according to $\xpom F^{D(3)}_2 (\xpom,\beta,Q^2) = (x_0/ \xpom)^n
F^{D(2)}_2(\beta,Q^2)$. They are also consistent with QCD based models which
incorporate factorization breaking. The rise of $\xpom F^{D(3)}_2$ with
decreasing $\xpom$ and the weak dependence of $F^{D(2)}_2$ on $Q^2$ suggest a
substantial contribution from partonic interactions.


title: New Bounds from Searching for Muonium to Antimuonium Conversion

abstract:
  A new upper limit for the probability of spontaneous muonium to antimuonium
conversion was established at ${\rm P_{M\bar{M}}} \leq 8.2 \cdot 10^{-11}$
(90%C.L.) in 0.1~T magnetic field, which implies consequences for speculative
extensions to the standard model. Coupling parameters in R-parity violating
supersymmetry and the mass of a flavour diagonal bileptonic gauge boson can be
significantly restricted. A Z$_8$ model with radiative mass generation through
heavy lepton seed and the minimal version of 331-GUT models are ruled out.


title:
Application of neural network for photon-hadron discrimination in a
  preshower detector in high energy heavy ion collisions

abstract:
  Using a combination of a preshower detector and a charged particle veto, it
is shown that the neural network method is able to provide satisfactory
discrimination between photons and hadrons in the case of extremely high
particle density produced in the forward region of heavy ion collisions at the
LHC energy.


title:
The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive
  Deep-inelastic Scattering

abstract:
  The flavor asymmetry of the light quark sea of the nucleon is determined in
the kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first time
from semi-inclusive deep-inelastic scattering. The quantity
(dbar(x)-ubar(x))/(u(x)-d(x)) is derived from a relationship between the yields
of positive and negative pions from unpolarized hydrogen and deuterium targets.
The flavor asymmetry dbar-ubar is found to be non-zero and x dependent, showing
an excess of dbar over ubar quarks in the proton.


title:
The Dijet Mass Spectrum and a Search for Quark Compositeness in bar{p}p
  Collisions at sqrt{s} = 1.8 TeV

abstract:
  Using the DZero detector at the 1.8 TeV pbarp Fermilab Tevatron collider, we
have measured the inclusive dijet mass spectrum in the central pseudorapidity
region |eta_jet| < 1.0 for dijet masses greater than 200 Gev/c^2. We have also
measured the ratio of spectra sigma(|eta_jet| < 0.5)/sigma(0.5 < |eta_jet| <
1.0). The order alpha_s^3 QCD predictions are in good agreement with the data
and we rule out models of quark compositeness with a contact interaction scale
< 2.4 TeV at the 95% confidence level.


title:
Measurement of the Proton Spin Structure Function g1p with a Pure
  Hydrogen Target

abstract:
  A measurement of the proton spin structure function g1p(x,Q^2) in
deep-inelastic scattering is presented. The data were taken with the 27.6 GeV
longitudinally polarised positron beam at HERA incident on a longitudinally
polarised pure hydrogen gas target internal to the storage ring. The kinematic
range is 0.021<x<0.85 and 0.8 GeV^2<Q^2<20 GeV^2. The integral
Int_{0.021}^{0.85} g1p(x)dx evaluated at Q0^2 of 2.5 GeV^2 is
0.122+/-0.003(stat.)+/-0.010(syst.).


title: First Observation of PHI(1020)--->PI0+PI0+GAMMA Decay

abstract:
  In the SND experiment at the VEPP-2M electron-positron collider the
PHI(1020)--->PI0+PI0+GAMMA decay was studied. The branching ratio
B(PHI--->PI0+PI0+GAMMA)=(1.14+-0.10+-0.12)x10^{-4} was measured. It was shown,
that the F0(980)GAMMA mechanism dominates in this decay and the 4-quark model
of F0(980) describes our data most consistently.


title: Photon Structure and gamma-gamma Physics

abstract:
  The LEP experiments are making real progress in understanding the structure
of the photon, though the results do not yet give such clear demonstrations of
QCD in action as the proton structure has done. Other new results are reported,
including QED related effects and $\gamma \gamma \to Resonances$, from LEP and
from CLEO II.


title:
The Inclusive Jet Cross Section in pbar-p Collisions at sqrt(s) = 1.8
  TeV

abstract:
  We have made a precise measurement of the central inclusive jet cross section
at sqrt(s) = 1.8 TeV. The measurement is based on an integrated luminosity of
92 pb-1 collected at the Fermilab Tevatron pbar-p Collider with the D-Zero
detector. The cross section, reported as a function of jet transverse energy
(ET >= 60 GeV) in the pseudorapidity interval |eta| <= 0.5, is in good
agreement with predictions from next-to-leading order quantum chromodynamics.


title:
Multi-Jet Event Rates in Deep Inelastic Scattering and Determination of
  the Strong Coupling Constant

abstract:
  Jet event rates in deep inelastic ep scattering at HERA are investigated
applying the modified JADE jet algorithm. The analysis uses data taken with the
H1 detector in 1994 and 1995. The data are corrected for detector and
hadronization effects and then compared with perturbative QCD predictions using
next-to-leading order calculations. The strong coupling constant alpha_S(M_Z^2)
is determined evaluating the jet event rates. Values of alpha_S(Q^2) are
extracted in four different bins of the negative squared momentum
transfer~$\qq$ in the range from 40 GeV2 to 4000 GeV2. A combined fit of the
renormalization group equation to these several alpha_S(Q^2) values results in
alpha_S(M_Z^2) = 0.117+-0.003(stat)+0.009-0.013(syst)+0.006(jet algorithm).


title: Measurement of Elastic $\Upsilon$ Photoproduction at HERA

abstract:
  The photoproduction reaction gamma p -> mu+ mu- p has been studied in ep
interactions using the ZEUS detector at HERA. The data sample corresponds to an
integrated luminosity of 43.2 pb^{-1}. The Upsilon meson has been observed in
photoproduction for the first time. The sum of the products of the elastic
Upsilon(1S), Upsilon(2S), Upsilon(3S) photoproduction cross sections with their
respective branching ratios is determined to be 13.3 +-
6.0(stat.)^{+2.7}_{-2.3}(syst.) pb at a mean photon-proton centre of mass
energy of 120 GeV. The cross section is above the prediction of a perturbative
QCD model.


title:
A study of the centrally produced K*K* and phi omega systems in pp
  interactions at 450 GeV/c

abstract:
  A study of the reactions pp -> pfps(K+K-pi+pi-) and pp -> pfps(K+K-pi+pi-pi0)
shows evidence for the K*K* and phi omega channels respectively. The K*K* mass
spectrum shows a broad distribution with a maximum near threshold and an
angular analysis shows that it is compatible with having JP = 2+. The behaviour
of the cross-section as a function of centre of mass energy, and the four
momentum transfer dependence, are compatible with what would be expected if the
K*K* system was produced via double Pomeron exchange. The dPT behaviour of the
phi omega channel is similar to what has been observed for all the undisputed
qqbar states. In contrast, the dPT behaviour of the K*K* final state is similar
to what has been observed for the phi phi final state and for previously
observed glueball candidates.


title: Discovery of the B_c Meson

abstract: This paper reports on the discovery of the B_c meson.


title: Jets as a Source of Information about Photon Structure

abstract:
  A review of recent jet measurements of the photon structure from the H1
experiment at HERA. The scale and the virtuality dependence of the effective
parton distribution function of the photon is discussed.


title:
New results on the numu-nutau oscillation search with the CHORUS
  detector

abstract:
  The present results on the $\numtonut$ oscillation search by the CHORUS
experiment at CERN are summarised. A fraction of the neutrino interactions
collected in 1994-1995-1996 by the CHORUS experiment has been analysed,
searching for $\nu_{\tau}$ charged current interactions followed by the $\tau$
lepton decay into a negative hadron or into a muon. A sample of 68,156 events
with an identified final state muon and 7,206 events without an identified muon
in the final state have been located in the emulsion target. Within the applied
cuts, no $\nu_{\tau}$ candidate has been found. This result leads to a 90% C.L.
limit $P(\numtonut)< 6.0\cdot 10^{-4}$ on the mixing probability.


title:
Search for muonic decays of the antiproton at the Fermilab Antiproton
  Accumulator

abstract:
  A search for antiproton decay has been made at the Fermilab Antiproton
Accumulator. Limits are placed on six antiproton decay modes which contain a
final-state muon. At the 90% C.L. we find that
  tau/B(mu gamma) > 5.0 x 10^4 yr,
  tau/B(mu pi0) > 4.8 x 10^4 yr,
  tau/B(mu eta) > 7.9 x 10^3 yr,
  tau/B(mu gamma gamma) > 2.3 x 10^4 yr,
  tau/B(mu K0S > 4.3 x 10^3 yr, and
  tau/B(mu K0L) > 6.5 x 10^3 yr.


title: A Preshower Photon Multiplicity Detector for the WA98 Experiment

abstract:
  A high granularity preshower detector has been fabricated and installed in
the WA98 Experiment at the CERN SPS for measuring the spatial distribution of
photons produced in the forward region in lead ion induced interactions.
  Photons are counted by detecting the preshower signal in plastic scintillator
pads placed behind a 3 radiation length thick lead converter and applying a
threshold on the scintillator signal to reject the minimum ionizing particles.
  Techniques to improve the imaging of the fibre and performance of the
detector in the high multiplicity environment of lead-lead collisions are
described.
  Using Monte-Carlo simulation methods and test beam data of pi- and e- at
various energies the photon counting efficiency is estimated to be 68% for
central and 73% for peripheral Pb+Pb collisions.


title: Calibration of Super-Kamiokande Using an Electron Linac

abstract:
  In order to calibrate the Super-Kamiokande experiment for solar neutrino
measurements, a linear accelerator (LINAC) for electrons was installed at the
detector. LINAC data were taken at various positions in the detector volume,
tracking the detector response in the variables relevant to solar neutrino
analysis. In particular, the absolute energy scale is now known with less than
1 percent uncertainty.


title: Nucleon Structure Functions

abstract:
  New structure function measurements from fixed target experiments and
especially HERA are reviewed. The extraction of parton distributions from these
measurements is discussed with special emphasis on systematic problems. Finally
the present uncertainty of our knowledge on parton distributions and on the
strong coupling constant from DIS are dicussed.


title: Small Angle J/Psi Production in ppbar Collisions at sqrt(s)=1.8TeV

abstract:
  This paper presents the first measurement of the inclusive J/Psi production
cross section in the forward pseudorapidity region 2.5<|eta|<3.7 in ppbar
collisions at sqrt(s)=1.8TeV. The results are based on 9.8 pb-1 of data
collected using the D0 detector at the Fermilab Tevatron Collider. The
inclusive J/Psi cross section for transverse momenta between 1 and 16 GeV/c is
compared with theoretical models of charmonium production.


title: An Update on CLEO's Study of B Meson Decays

abstract:
  This is a discussion of the main branching fractions of B Meson decays $(b\to
cW^{-})$. A summary of what has been measured and what remains unmeasured is
presented.


title: First Observation of $\Upsilon(1S)\to \gamma\pi\pi$

abstract:
  We report on a study of exclusive radiative decays of the Upsilon(1S)
resonance collected with the CLEO-II detector operating at CESR. We present the
first observation of the radiative decays Upsilon(1S)->gamma pi+pi- and
Upsilon(1S)->gamma pi0pi0. For the dipion mass regime m(pipi)>1.0 GeV, we
obtain Br(Upsilon(1S)->gamma pi+pi-=(6.3+/-1.2+/-1.3) x 10^(-5), and
Br(Upsilon(1S)->gamma pi0pi0=(1.7+/-0.6+/-0.3) x 10^(-5). The observed gamma
pipi events are consistent with the hypothesis Upsilon(1S)->gamma f2(1270).


title:
The Observation of Up-going Charged Particles Produced by High Energy
  Muons in Underground Detectors

abstract:
  An experimental study of the production of up-going charged particles in
inelastic interactions of down-going underground muons is reported, using data
obtained from the MACRO detector at the Gran Sasso Laboratory. In a sample of
12.2 10^6 single muons, corresponding to a detector livetime of 1.55 y, 243
events are observed having an up-going particle associated with a down-going
muon. These events are analysed to determine the range and emission angle
distributions of the up-going particle, corrected for detection and
reconstruction efficiency. Measurements of the muon neutrino flux by
underground detectors are often based on the observation of through-going and
stopping muons produced in $\nu_\mu$ interactions in the rock below the
detector. Up-going particles produced by an undetected down-going muon are a
potential background source in these measurements. The implications of this
background for neutrino studies using MACRO are discussed.


title: RHIC Spin Physics

abstract:
  We describe the foreseen spin physics of the polarized proton-proton collider
at RHIC. The study of the spin structure of the nucleon at RHIC is unique and
complementary to the traditional polarized DIS experiments. The sensitivities
of the gluon polarization measurement via prompt photon production and
anti-quark polarization measurement using W production with the PHENIX detector
system are reviewed.


title: Low energy atmospheric muon neutrinos in MACRO

abstract:
  The flux of low energy neutrinos (<E_nu>~ 4 GeV) has been studied with the
MACRO detector at Gran Sasso via the detection of muon neutrinos interactions
inside the apparatus, and of upward-going stopping muons. Data collected in ~3
y with the full apparatus were analyzed. The results are compatible with a
deficit of the flux of atmospheric muon neutrinos from below, and no reduction
from above, with respect to Monte Carlo predictions. The deficit and the
angular distributions are interpreted in terms of neutrino oscillations, and
compared with the MACRO results on the upward throughgoing muons (<E_nu>~ 100
GeV).


title:
Estimating the Parameters of Bose-Einstein Correlations from the
  Two-Particle Correlation Function in Multihadronic Final States

abstract:
  To estimate the strength of the Bose-Einstein correlations and the radius of
the hadronization region in multiparticle production, the two-particle
correlation functions $R$ for identical pairs is adjusted to a parametric
function describing the enhancement at small momentum differences. This is
usually done by means of a binned uncorrelated least squares fit. This article
demonstrates that this procedure underestimates the statistical errors. A
recipe is given to construct from the data the covariance matrix To estimate
the strength of the Bose-Einstein correlations and the radius of the
hadronization region in multiparticle production, the two-particle correlation
functions $R$ for identical pairs is adjusted to a parametric function
describing the enhancement at small momentum differences. This is usually done
by means of a binned uncorrelated least squares fit. This article demonstrates
that this procedure underestimates the statistical errors. A recipe is given to
construct from the data the covariance matrix between the bins of the histogram
of the two-particle correlation function.


title: Measurement of the Bs0 Meson Lifetime Using Semileptonic Decays

abstract:
  The lifetime of the Bs0 meson is measured using the semileptonic decay Bs0
--> Ds- l+ nu X. The data sample consists of about 110 pb^-1 of pp= collisions
at sqrt{s} = 1.8 TeV collected by the CDF detector at Fermilab. Four different
Ds- decay modes are reconstructed resulting in approximately 600 Ds-l+ signal
events. The Bs0 meson lifetime is determined to be tau(Bs0) = (1.36 +- 0.09
+0.06-0.05) ps, where the first and second uncertainties are statistical and
systematic, respectively. The Bs0 meson decay length distribution is examined
for a lifetime difference Delta_Gamma/Gamma between the two mass eigenstates of
the Bs0 meson. An upper limit of Delta_Gamma/Gamma < 0.83 is set at 95%
confidence level.


title:
Rencontres de Moriond '98 -- QCD and Hadronic Interactions: Experimental
  Summary

abstract:
  I discuss new experimental results reported at this conference that bear
directly on three previously reported anomalies: the excess of high Q^2 events
at HERA; the excess of W + 1 jet events, relative to W's without jets, in D0
data; and the excess of high E_T inclusive jets observed by CDF. The new
results all point in the direction of reducing the experimental significance of
these excesses.


title: Event Shapes from JADE Data and Studies of Power Corrections

abstract:
  Studies of event shape observables at PETRA and LEP energies are presented.
Previously published determinations of the strong coupling constant \alpha_s at
\sqrt{s} = 35 and 44 GeV are complemented using new resummed QCD calculations
for the C parameter and improved calculations for the jet broadening variables
B_T and B_W which recently became available. Furthermore, recently predicted
power corrections to the differential distributions of these observables are
investigated. In this study, e^+e^- data between \sqrt{s} = 35 and 183 GeV are
considered.


title:
Measurement of the Average Polarization of b Baryons in Hadronic Z^0
  Decays

abstract:
  In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0
peak have a large average longitudinal polarization of -0.94. Some fraction of
this polarization is expected to be transferred to b-flavored baryons during
hadronization. The average longitudinal polarization of weakly decaying b
baryons, <P_L^{\Lambda_b}>, is measured in approximately 4.3 million hadronic
Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those
b baryons that decay semileptonically and produce a \Lambda baryon are
identified through the correlation of the baryon number of the \Lambda and the
electric charge of the lepton. In this semileptonic decay, the ratio of the
neutrino energy to the lepton energy is a sensitive polarization observable.
The neutrino energy is estimated using missing energy measurements. From a fit
to the distribution of this ratio, the value
  <P_L^{\Lambda_b}> = -0.56^{+0.20}_{-0.13} +/- 0.09
  is obtained, where the first error is statistical and the second systematic.


title: Reconstruction and Particle Identification for a DIRC System

abstract:
  We study the reconstruction and particle identification (PID) problem for
Ring Imaging devices providing a good knowledge of the direction of the
Cerenkov photons, as the DIRC system, on which we specialize. We advocate first
the use of the stereographic projection as a tool allowing a suitable
representation of the photon data, as it allows to represent the Cerenkov cone
always as a circle. We set up an algorithm able to perform reliably a fit of
circle arcs of small angular opening, by minimising a true Chi2 expression. The
system we develop for PID relies on this algorithm and on a procedure able to
remove background photons with a high efficiency. We thus show that, even when
the background is large, it is possible to perform an efficient PID by means of
a fit algorithm which finally provides all the circle parameters; these are
connected with the charged track direction and its Cerenkov angle. It is shown
that background effects can be dealt without spoiling significantly the
reconstruction probability distributions.


title: $\Upsilon$ Dipion Transitions at Energies Near the $\Upsilon(4S)$

abstract:
  Using a data sample collected with the CLEO II detector at CESR, we have
searched for dipion transitions between pairs of $\Upsilon$ resonances at
energies near the $\Upsilon(4S)$. We obtain upper limits $B(\Upsilon(4S)\to
\Upsilon(2S)\pi^+\pi^-) < 3.9 \times 10^{-4}$ and $B(\Upsilon(4S)\to
\Upsilon(1S)\pi^+\pi^-) < 1.2 \times 10^{-4}$. We also observe the transitions
$\Upsilon(3S)\to \Upsilon(1S)$, $\Upsilon(3S)\to \Upsilon(2S)$, and
$\Upsilon(2S)\to \Upsilon(1S)$, from which we measure the cross-sections for
the radiative processes $e^+e^- \to \Upsilon(3S)\gamma$ and $e^+e^- \to
\Upsilon(2S)\gamma$.


title:
Inclusive Production of Charged Hadrons and K_s Mesons in Photon-Photon
  Collisions

abstract:
  The production of charged hadrons and K_s mesons in the collisions of
quasi-real photons has been measured using the OPAL detector at LEP. The data
were taken at e+e- centre-of-mass energies of 161 and 172 GeV. The differential
cross-sections as a function of the transverse momentum and the pseudorapidity
of the charged hadrons and K_s mesons have been compared to the leading order
Monte Carlo simulations of PHOJET and PYTHIA and to perturbative
next-to-leading order (NLO) QCD calculations. The distributions have been
measured in the range 10-125 GeV of the hadronic invariant mass W. By comparing
the transverse momentum distribution of charged hadrons measured in gamma-gamma
interactions with gamma-proton and meson-proton data we find evidence for hard
photon interactions in addition to the purely hadronic photon interactions.


title:
Search for Squarks and Gluinos in Single-Photon Events with Jets and
  Large Missing Transverse Energy in ppbar Collisions at SQRT(S)=1.8 TeV

abstract:
  We search for physics beyond the standard model using events with a photon,
two or more hadronic jets, and an apparent imbalance in transverse energy, in
$p\bar{p}$ collisions at the Fermilab Tevatron at $\sqrt{s}=1.8$ TeV. Such
events are predicted for production of supersymmetric particles. No excess is
observed beyond expected background. For the parameter space of the minimal
supersymmetric standard model with branching fraction $B(\tilde\chi^0_2 \to
\gamma\tilde\chi^0_1) = 1$ and $m_{\tilde\chi^0_2}-m_{\tilde\chi^0_1}>20$ GeV,
we obtain a 95% confidence level lower limit of 310 GeV for the masses of
squarks and gluinos, where their masses are assumed equal.


title: Measurement of Tau Branching Ratios to Five Charged Hadrons

abstract:
  The branching ratios of the decay of the tau lepton to five charged hadrons
have been measured with the OPAL detector at LEP using data collected between
1991 and 1995 at e+e- centre-of-mass energies close to the Z resonance. The
branching ratios are measured to be BR(tau- to 3h-2h+nutau) =
0.091+-0.014+-0.005% BR(tau- to 3h-2h+pi0nutau) = 0.027+-0.018+-0.007% where
the first error is statistical and the second systematic.


title: Multi-photon production in e+e- collisions at sqrt(s) = 183 GeV

abstract:
  The process e+e- to gamma gamma (gamma) is studied using data recorded with
the OPAL detector at LEP. The data sample corresponds to a total integrated
luminosity of 56.2 pb-1 taken at a centre-of-mass energy of 183 GeV. The
measured cross-section agrees well with the expectation from QED. A fit to the
angular distribution is used to obtain improved limits at 95% CL on the QED
cut-off parameters: Lambda+ > 233 GeV and Lambda- > 265 GeV as well as a mass
limit for an excited electron, M(e*) > 227 GeV assuming equal e*egamma and
eegamma couplings. No evidence for resonance production is found in the
invariant mass spectrum of photon pairs. Limits are obtained for the
cross-section times branching ratio for a resonance decaying into two photons.


title: Diffractive dijet production at HERA

abstract:
  Interactions of the type ep -> eXY are studied, where the component X of the
hadronic final state contains two jets and is well separated in rapidity from a
leading baryonic system Y. Analyses are performed of both resolved and direct
photoproduction and of deep-inelastic scattering with photon virtualities in
the range 7.5 < Q^2 < 80 GeV^2. Cross sections are presented where Y has mass
M_Y < 1.6 GeV, the squared four-momentum transferred at the proton vertex
satisfies |t| < 1 GeV^2 and the two jets each have transverse momentum p^jet_T
> 5 GeV relative to the photon direction in the rest frame of X. Models based
on a factorisable diffractive exchange with a gluon dominated structure,
evolved to a scale set by the transverse momentum p^hat_T of the outgoing
partons from the hard interaction, give good descriptions of the data.
Exclusive qqbar production, as calculated in perturbative QCD using the squared
proton gluon density, represents at most a small fraction of the measured cross
section. The compatibility of the data with a breaking of diffractive
factorisation due to spectator interactions in resolved photoproduction is
investigated.