title: Experimental properties of gluon and quark jets from a point source

abstract:
  Gluon jets are identified in hadronic Z0 decays as all the particles in a
hemisphere opposite to a hemisphere containing two tagged quark jets. Gluon
jets defined in this manner are equivalent to gluon jets produced from a color
singlet point source and thus correspond to the definition employed for most
theoretical calculations. In a separate stage of the analysis, we select quark
jets in a manner to correspond to calculations, as the particles in hemispheres
of flavor tagged light quark (uds) events. We present the distributions of
rapidity, scaled energy, the logarithm of the momentum, and transverse momentum
with respect to the jet axes, for charged particles in these gluon and quark
jets. We also examine the charged particle multiplicity distributions of the
jets in restricted intervals of rapidity. For soft particles at large
transverse momentum, we observe the charged particle multiplicity ratio of
gluon to quark jets to be 2.29 +- 0.09 +- 0.15 in agreement with the prediction
that this ratio should approximately equal the ratio of QCD color factors,
CA/CF = 2.25. The intervals used to define soft particles and large transverse
momentum for this result, p<4 GeV/c and 0.8<p_t<3.0 GeV/c, are motivated by the
predictions of the Herwig Monte Carlo multihadronic event generator.
Additionally, our gluon jet data allow a sensitive test of the phenomenon of
non-leading QCD terms known as color reconnection. We test the model of color
reconnection implemented in the Ariadne Monte Carlo multihadronic event
generator and find it to be disfavored by our data.


title: New DELPHI Results from Semileptonic b, c Decays

abstract:
  The inclusive direct and cascade semileptonic branching ratios of the b quark
were measured from a fit to the lepton momentum spectrum in the B-hadron rest
frame, exploiting the charge correlation between the lepton and the heavy
meson. The value of the Vcb element in the CKM quark mixing matrix was computed
from the differential decay width of the process B0--> D+-* l- nu, measured as
a function of the product W of the B and D* 4-velocities, using an inclusive
method of D* reconstruction. A measurement of the ratio Vub/Vcb has been
obtained by using the reconstructed secondary hadronic mass in semileptonic
decays of B hadrons. The charm semileptonic branching ratio was measured using
a double tag method based on the detection of exclusively reconstructed D
mesons accompanied by a lepton in the opposite hemisphere.


title: Current Status of Nucleon Decay Searches with Super-Kamiokande

abstract:
  Evidence for Nucleon Decay has yet to be observed. Current results from the
observation of a 45 kton-year exposure of Super-Kamiokande and lifetime limits
for nucleons to decay via lepton + pion, lepton + eta and lepton + kaon modes
are presented.


title: Measurement of the Neutrino-induced Semi-contained Events in MACRO

abstract:
  A preliminary analysis is presented of low-energy ($\bar{E_\nu} \sim 4 GeV$)
neutrino interactions observed by the MACRO detector. These include neutrino
interactions in the detector, as well as upgoing neutrino-induced muons that
stop in the detector. At these energies, essentially all observed interactions
can be attributed to atmospheric neutrinos. A large deficit is observed
compared to a no-oscillations Monte Carlo prediction, although the systematic
errors are large. However, the observation agrees well with neutrino
oscillations with parameters suggested by the MACRO upward throughgoing muon
analysis as well as other experiments (maximal mixing with $\Delta m^2$ of a
few times $10^{-3}$).


title: Branching Ratio and Form Factor Measurements of $\Xi^0$ Beta Decay

abstract:
  We present a branching ratio measurement for the beta decay of neutral
Cascade hyperon to a positive Sigma, electron and neutrino. Data were collected
during 1997 with the KTeV detector at Fermilab. We used the principal decay
mode, Cascade to a Lambda and a neutral pion, as the flux normalization mode.
The status of the measurement of the ratio of the axial-vector to vector
coupling (g_1/f_1) for this decay will also be discussed. Furthermore, we
present the preliminary branching ratio measurement for the muonic channel of
Cascade beta decay.


title: Recent Heavy-Flavor Measurements from OPAL

abstract:
  A selection of recent heavy-flavor results from OPAL using the LEP1 data
sample are presented. The average polarization of b baryons in hadronic Z^0
decay has been measured to be -0.56^{+0.20}_{-0.13} (stat.) +- 0.09(syst.)
using semileptonic decays of Lambda_b baryons. A search has been conducted for
the radially excited D*' and has produced a 95% CL upper limit on its
production of f(Z^0 -> D*'+-(2629))xBr(D*'+- -> D*+- pi+ pi-) < 2.1x10^{-3}.
Finally, the measurement of the product branching ratio $f(b ->
Lambda_b)xBr(Lambda_b -> Lambda X)= (2.67 +- 0.38 (stat)
^{+0.67}_{-0.60}(syst.))% has been made. This measurement, along with an
earlier measurement of the product branching ratio f(b -> Lambda_b)xBr(Lambda_b
-> Lambda l X), has been used to compute an updated R_{Lambda l} = Br(Lambda_b
-> Lambda l X)/Br(Lambda_b -> \Lambda X)= (8.0 +- 1.2 (stat.) +- 0.9 (syst.))%,
consistent with the expected low semileptonic branching fraction of the
Lambda_b inferred from its short lifetime compared to the other b hadrons.


title: Triggering BTeV

abstract:
  BTeV is a collider experiment at Fermilab designed for precision studies of
CP violation and mixing. Unlike most collider experiments, the BTeV detector
has a forward geometry that is optimized for the measurement of B and charm
decays in a high-rate environment. While the rate of B production gives BTeV an
advantage of almost four orders of magnitude over e+e- B factories, the BTeV
Level 1 trigger must be able to accept data at a rate of 100 Gigabytes per
second, reconstruct tracks and vertices, trigger on B events with high
efficiency, and reject minimum bias events by a factor of 100:1. An overview of
the Level 1 trigger will be presented.


title: Solar Neutrinos with Super-Kamiokande

abstract:
  The discrepancy of the measured solar neutrino flux compared to the
predictions of the standard solar model may be explained by the neutrino flavor
oscillation hypothesis. A more direct and less model-dependent test of this
hypothesis is a measurement of the distortion of the shape of the solar
neutrino energy spectrum. Super-Kamiokande studies the energy spectrum of
recoil electrons from solar neutrino scattering in water above 5.5 MeV.


title: The ATLAS Pixel Project

abstract:
  The ATLAS experiment, at the Large Hadron Collider, will incorporate
discrete, high-resolution tracking sub-systems in the form of segmented silicon
detectors with 40MHz radiation-hard readout electronics. In the region closest
to the pp interaction point, the thin silicon tiles will be segmented into a
pixel geometry providing two-dimensional space-point information. The current
status of the ATLAS pixel project will be presented with an emphasis on the
performance of the front-end electronics and prototype sensors.


title: Recent Charmonium Results from BES (Talk Presented at DPF99)

abstract:
  Recent results obtained from the BES psi(2S) data are summarized, including
the measurement of the branching ratio of the J/psi to leptons, B(J/psi -> l^+
l^-) = 5.87 +/- 0.04 +/- 0.09, many psi(2S) and chi_c branching ratios,
information on the rho-pi puzzle, and measurements of the mass of the chi_c0,
m(chi_c0) = 3414.1 +/- 0.6 +/- 0.8 MeV, and the eta_c, m(eta_c) = 2975.8 +/-
3.9 +/- 1.2 MeV.


title: HERA Collider Physics

abstract:
  HERA, the first electron-proton collider, has been delivering luminosity
since 1992. It is the natural extension of an impressive series of fixed-target
lepton-nucleon scattering experiments. The increase of a factor ten in
center-of-mass energy over that available for fixed-target experiments has
allowed the discovery of several important results, such as the large number of
slow partons in the proton, and the sizeable diffractive cross section at large
$Q^2$. Recent data point to a possible deviation from Standard Model
expectations at very high $Q^2$, highlighting the physics potential of HERA for
new effects. The HERA program is currently in a transition period. The first
six years of data taking have primarily elucidated the structure of the proton,
allowed detailed QCD studies and had a strong impact on the understanding of
QCD dynamics. The coming years will bring the era of electroweak studies and
high $Q^2$ measurements. This is therefore an appropriate juncture at which to
review HERA results.


title: Recent Electroweak Results from the Tevatron

abstract:
  Recent electroweak results from the CDF and D0 Collaborations at the Fermilab
Tevatron Collider are presented. After a brief description of the \D0
measurements of W/Z production cross sections, W width, W mass and W \to \tau
\nu decays, the CDF result on W(pT) distribution is outlined. The comprehensive
search for anomalous gauge couplings by \D0 in 1992-96 data is presented along
with a detailed description of the WW/WZ \to \mu\nu jj channel.


title: Inelastic electron-pion scattering at FNAL (SELEX)

abstract:
  In this report we describe the analysis status of electron-pion inelastic
scattering $\pi e \to \pi' e' \gamma$ and $\pi e \to \pi' e' \pi^0$ reaction
data, measured in inverse pion-electron scattering at 590 GeV/c at FNAL. The
data give information on reactions that were never previously measured: (1)
$\pi e \to \rho e'$ scattering for a determination of the $\rho \to \pi \gamma$
radiative width from a measurement of the transition form factor near zero
momentum transfer, (2) $ \pi e \to e' \pi' \pi^0$ scattering near threshold for
a determination of the chiral anomaly transition form factor and the $\gamma
\to 3 \pi$ F$_{3\pi}$ chiral anomaly amplitude, and (3) $\pi e \to \pi' e'
\gamma $ scattering, in which a virtual photon from the electron's Coulomb
field is Compton scattered on the pion, for a determination of the never
previously measured generalized pion polarizabilities.


title: Measurements of $A_{LR}$, $A_{lepton}$ and $A_{b}$ from SLD

abstract:
  We present the measurements of the leptonic asymmetries in $Z^0$ decays
measured by the SLD experiment at SLAC. A data sample of approximately 550,000
$Z^0$ bosons are used for the preliminary measurement of $A_{LR}(A_{e})$ and
the leptonic final state measurements of $A_{e}$, $A_{\mu}$ and $A_{\tau}$,
representing the entire set of 1992-1998 SLD runs. When combining all results,
a preliminary value for the effective weak mixing angle is obtained:
${\sin}^2{\theta}_{W}^{eff} = 0.23109 \pm 0.00029$. We also present the direct
measurements of $A_{b}$ from left-right forward-backward asymmetries, using
partial data samples from 1993-1998 SLD runs. The preliminary value combines
jet charge, cascade kaon and semileptonic decay analyses to obtain $A_{b} =
0.866 \pm 0.036$.


title: Search for bottom squarks in pbarp collisions at sqrt(s)=1.8 TeV

abstract:
  We report on a search for bottom squarks produced in pbarp collisions at
sqrt(s) = 1.8 TeV using the D0 detector at Fermilab. Bottom squarks are assumed
to be produced in pairs and to decay to the lightest supersymmetric particle
(LSP) and a b quark with branching fraction of 100%. The LSP is assumed to be
the lightest neutralino and stable. We set limits on the production cross
section as a function of bottom squark mass and LSP mass.


title:
A partial wave analysis of the centrally produced K+K- and K0K0 systems
  in pp interactions at 450 GeV/c and new information on the spin of the
  fJ(1710)

abstract:
  A partial wave analysis of the centrally produced K+K- and K0K0 channels has
been performed in pp collisions using an incident beam momentum of 450 GeV/c.
An unambiguous physical solution has been found in each channel. The striking
feature is the observation of peaks in the S-wave corresponding to the f0(1500)
and fJ(1710) with J = 0. The D-wave shows evidence for the f2(1270)/a2(1320),
the f2(1525) and the f2(2150) but there is no evidence for a statistically
significant contribution in the D-wave in the 1.7 GeV mass region.


title:
A partial wave analysis of the centrally produced pi+pi- system in pp
  interactions at 450 GeV/c

abstract:
  A partial wave analysis of the centrally produced pi+pi- channel has been
performed in pp collisions using an incident beam momentum of 450 GeV/c. An
unambiguous physical solution has been found. Evidence is found for the
f0(980), f0(1300), f0(1500) and fJ(1710) with J = 0 in the the S-wave. The
rho(770) is observed dominantly in the P0-wave and the f2(1270) is observed
dominantly in the D0-wave. In addition, there is evidence for a broad
enhancement in the D-wave below 1 GeV.


title:
A partial wave analysis of the centrally produced pi0pi0 system in pp
  interactions at 450 GeV/c

abstract:
  A partial wave analysis of the centrally produced pi0pi0 channel has been
performed in pp collisions using an incident beam momentum of 450 GeV/c. An
unambiguous physical solution has been found. Evidence is found for the
f0(980), f0(1300) and f0(1500) in the the S-wave. and the f2(1270) is observed
dominantly in the D0-wave. In addition, there is evidence for a broad
enhancement in the D-wave below 1 GeV.


title: Particle Identification with BELLE

abstract:
  The working principle and performance of the BELLE particle identification
device (PID), based on a hybrid system consisting of an array of high precision
scintillator Time of Flight and silica Aerogel Counters, is discussed. The
performances achieved in the beam tests are satisfactory and Monte Carlo tests
of meeting physics objectives of BELLE are promising. Prior to the real
experiment which is expected to commence in spring 1999, the BELLE PID is
taking cosmic ray data for calibration and fine tuning.


title: Structure Functions, the Gluon Density, and PQCD Tests

abstract:
  Measurements of the proton structure function F_2 for 0.11 < Q^2 < 20000
GeV^2 and 1.2 X 10^-5 < x < 0.65 from ZEUS 1994-1997 measurements are
presented. From ZEUS 1994 and 1995 F_2 data the slopes d(F_2)/d(ln Q^2) at
fixed x and d(ln F_2)/d(ln(1/x)) for x < 0.01 at fixed Q^2 are derived. For the
latter E665 data are also used. The transition region in Q^2 is explored using
the simplest non-perturbative models and NLO QCD. The data at very low Q^2 <=
0.65 GeV^2 are described successfully by Regge theory. From a NLO QCD fit to
ZEUS data the gluon density in the proton is extracted in the range 3 X 10^-5 <
x < 0.7. Data from NMC and BCDMS constrain the fit at large x. Assuming the NLO
QCD description to be valid down to Q^2 of 1 GeV^2, it is found that the qqbar
sea distribution is still rising at small x and the lowest Q^2 values whereas
the gluon distribution is strongly suppressed. Preliminary ZEUS 1996-1997 $F_2$
measurements are also presented.


title: Neutrino-induced upward-going muons in Super-Kamiokande

abstract:
  Upward-going muons observed by the Super-Kamiokande detector are produced by
high-energy atmospheric neutrinos which interact in rock around the detector.
Those which pass completely through the detector have a mean parent neutrino
energy of ~100 GeV, while those which range out inside the detector come from
neutrinos of mean energy ~10 GeV. The neutrino baseline varies with the
observed muon zenith angle, allowing for an independent test via nu-mu
disappearance of the neutrino oscillations observed in the Super-Kamiokande
contained events. 614 upward through-going and 137 upward stopping muons were
observed over 537 (516) live days, resulting in a flux of
Phi_t=1.74\pm0.07(stat.)\pm0.02(sys.),
Phi_s=0.380\pm0.038(stat.)^{+0.019}_{-0.016}(sys.)
x10^{-13}cm^{-2}s^{-1}sr^{-1}. The observed stopping/through-going ratio
R=0.218\pm0.023(stat.)^{+0.014}_{-0.013}(syst.) is 2.9 sigma lower than the
expectation of 0.368^{+0.049}_{-0.044}(theo.). Both the shape of the zenith
angle distribution of the observed flux and this low ratio are inconsistent
with the null oscillation hypothesis, but are compatible with the previously
observed nu-mu <-> nu-tau oscillations. Taken as a whole, the addition of these
higher energy nu-mu data to the contained neutrino events provides a better
measurement of the oscillation parameters, narrowing the allowed parameter
range to sin^22theta >~0.9 and 1.5x10^{-3}eV^2 <~ \Delta m^2 <~6x10^{-3} at 90%
confidence.


title:
Light Gluino Search for Decays Containing pi+pi- or pi0 from a Neutral
  Hadron Beam at Fermilab

abstract:
  We report on two null searches, one for the spontaneous appearance of
$\pi^+\pi^-$ pairs, another for a single $\pi^0$, consistent with the decay of
a long-lived neutral particle into hadrons and an unseen neutral particle. For
the lowest level gluon-gluino bound state, known as the $R^0$, we exclude the
decays $R^0\to \pi^+\pi^-\tilde{\gamma}$ and $R^0\to \pi^0\tilde{\gamma}$ for
the masses of $R^0$ and $\tilde{\gamma}$ in the theoretically allowed range. In
the most interesting $R^0$ mass range, $\leq 3 GeV/c^2$, we exclude $R^0$
lifetimes from $3\times 10^{-10}$ seconds to as high as $10^{-3}$ seconds,
assuming perturbative QCD production for the $R^0$.


title: Jet shapes in ep collisions at HERA

abstract:
  New measurements of the jet shape in ep collisions at HERA using the
k_T-cluster jet algorithm are presented.


title:
Electron Response and e/h Ratio of Iron-Scintillator Hadron Prototype
  Calorimeter with Longitudinal Tile Configuration

abstract:
  The detailed information about electron response, electron energy resolution
and e/h ratio as a function of incident energy E, impact point Z and incidence
angle $\Theta$ of iron-scintillator hadron prototype calorimeter with
longitudinal tile configuration is presented. These results are based on
electron and pion beams data of E = 20, 50, 100, 150, 300 GeV at $\Theta =
10^o, 20^o, 30^o$, which were obtained during test beam period in July 1995.
The obtained calibration constant is used for muon response converting from pC
to GeV. The results are compared with existing experimental data and with some
Monte Carlo calculations.


title:
Effect on a Hadron Shower Leakage on the Energy Response and Resolution
  of Hadron TILE Calorimeter

abstract:
  The hadronic shower longitudinal and lateral leakages and its effect on the
pion response and energy resolution of iron-scintillator barrel hadron
prototype calorimeter with longitudinal tile configuration with a thickness of
9.4 nuclear interaction lengths have been investigated. The results are based
on 100 GeV pion beam data at incidence angle $\Theta = 10^o$ at impact point Z
in the range from - 36 to 20 cm which were obtained during test beam period in
May 1995 with setup equipped scintillator detector planes placed behind and
back of the calorimeter. The fraction of the energy of 100 GeV pions at $\Theta
= 10^o$ leaking out at the back of this calorimeter amounts to 1.8 % and agrees
with the one for a conventional iron-scintillator calorimeter. Unexpected
behaviour of the energy resolution as a function of leakage is observed: 6 %
lateral leakage lead to 18 % improving of energy resolution in compare with the
showers without leakage. The measured values of longitudinal punchthrough
probability $(18 \pm 1) %$ and $(20 \pm 1) %$ for two different hit definitions
of leaking events agree with the earlier measurement for our calorimeter and
with the one for a conventional iron-scintillator calorimeter with the same
nuclear interaction length thickness respectively. Due to more soft cut for hit
definition in the leakage detectors the measured value of longitudinal
punchthrough probability more corresponds to the calculated iron equivalent
length $L_{Fe} = 158 cm$.


title: Study of the Hadron Shower Profiles with the Tile Hadron Calorimeter

abstract:
  The lateral and longitudinal profiles of the hadronic showers detected by
iron-scintillator tile hadron calorimeter with longitudinal tile configuration
have been investigated. The results are based on 100 GeV pion beam data. Due to
the beam scan provided many different beam impact locations with cells it is
succeeded to obtain detailed picture of transverse shower behavior. The
underlying radial energy densities for four depths and for overall calorimeter
have been reconstructed. The three-dimensional hadronic shower parametrisation
have been suggested.


title: Measurement of W-pair production in e+e- collisions at 183 GeV

abstract:
  The production of W+W- pairs is analysed in a data sample collected by ALEPH
at a mean centre-of-mass energy of 182.7 GeV, corresponding to an integrated
luminosity of 57 pb-1. Cross sections are given for different topologies of W
decays into leptons or hadrons. Under Standard Model assumptions for the W-pair
production and decay, the W-pair cross section is measured to be
15.57+-0.62(stat.)+-0.29(syst.) pb. Using also the W-pair data samples
collected by ALEPH at lower centre-of-mass energies, the decay branching ratio
of the W boson into hadrons is measured to be B(W->hadrons)=
68.93+-1.21(stat.)+-0.51(syst.)%, allowing a determination of the CKM matrix
element |Vcs|= 1.043 +- 0.058(stat.) +- 0.026(syst.). The agreement of the
cross sections with the Standard Model prediction allows a limit to be set on
the W decay rate to undetectable final states.


title: Non-Compensation of the Barrel Tile Hadron Module-0 Calorimeter

abstract:
  The detailed experimental information about the electron and pion responses,
the electron energy resolution and the e/h ratio as a function of incident
energy E, impact point Z and incidence angle $\Theta$ of the Module-0 of the
iron-scintillator barrel hadron calorimeter with the longitudinal tile
configuration is presented. The results are based on the electron and pion
beams data for E = 10, 20, 60, 80, 100 and 180 GeV at $\eta$ = -0.25 and -0.55,
which have been obtained during the test beam period in 1996. The results are
compared with the existing experimental data of TILECAL 1m prototype modules,
various iron-scintillator calorimeters and with some Monte Carlo calculations.


title: Spin Structure Functions g_1 and g_2 for the Proton and Deuteron

abstract:
  The experiment E155 at SLAC measured the spin structure functions g_1 and g_2
of the proton and deuteron. The experiment used deep inelastic scattering of
48.3 GeV longitudinally polarized electrons incident on polarized solid
^{15}NH_3 and ^{6}LiD targets. The data taken by three independent
spectrometers covered a kinematic range of 0.014 < x < 0.9 and 1 (GeV/c)^2 <
Q^2 < 40 (GeV/c)^2. Due to the high luminosity and polarization available at
SLAC the data on g_1 are to date the most precise in this kinematic range. The
x and Q^2 dependence of g_1 has been studied using NLO PQCD fits, allowing
extraction of values for the Bjorken sum rule and quark and gluon spin
contributions to the nucleon. Results are presented for g_1 and g_2 for the
proton and deuteron.


title:
Measurement of multiplicity and momentum spectra in the current and
  target regions of the Breit frame in Deep Inelastic Scattering at HERA

abstract:
  Charged particle production in neutral current deep inelastic scattering
(DIS) has been studied using the ZEUS detector.The evolution of the mean
multiplicities, scaled momenta and transverse momenta in $Q^2$ and $x$ for $ 10
< Q^2 < 5120 GeV^2$ and $x > 6\times 10^{-4}$ has been investigated in the
current and target fragmentation regions of the Breit frame. Distributions in
the target region, using HERA data for the first time, are compared to
distributions in the current region. Predictions based on MLLA and LPHD are
inconsistent with the data.


title: Evidence for $K^+ \to \pi^+ \nu \bar{\nu}$

abstract:
  The first observation of the decay $K^+ \to \pi^+ \nu \bar{\nu}$ (pnn) has
been reported. The E787 experiment presented evidence for this decay, based on
the observation of a single clean event from data collected during the 1995 run
of the AGS (Alternating Gradient Synchrotron at Brookhaven National
Laboratory). The branching ratio indicated by this observation, B(pnn) =
4.2$^{+9.7}_{-3.5}\times10^{-10}$, is consistent with the Standard Model
expectation although the central experimental value is four times larger. The
final E787 data sample, from the 1995--98 runs, should reach a sensitivity of
about five times that of the 1995 run alone. A new experiment, E949, has been
given scientific approval and should start data collection in 2001. It is
expected to achieve a sensitivity of more than an order of magnitude below the
prediction of the Standard Model.


title: Inclusive Jet and Dijet Production at the Tevatron

abstract:
  High energy jet distributions measured since 1992 at the Fermilab Tevatron
proton--antiproton collider are presented and compared to theoretical
predictions. The statistical uncertainties on these measurements are
significantly reduced relative to previous results. The systematic
uncertainties are comparable in size to the uncertainty in the theoretical
predictions. Although some discrepancies between theory and measurements are
noted, the inclusive jet and dijet cross sections can be described by quantum
chromodynamics. Prospects for reducing the uncertainty in the theoretical
predictions by incorporating Tevatron measurements into the proton parton
distributions are discussed. Dijet distributions, in excellent agreement with
quantum chromodynamics, set a 2.5 TeV limit on the mass of quark constituents.


title: BES Results on Inclusive D Meson Decays

abstract:
  A preliminary measurement of branching fractions of the D0 and D+ mesons into
the phi meson is reported. The result is based on a data sample of 22.3 pb-1
collected at the CM energy of 4.03 GeV with the BES detector operated at the
BEPC e+e- storage ring. From tagged D\bar{D} pair events the average branching
fraction for a mixture of D0 and D+ is determined to be B(D->phiX)=
(1.29+-0.51+-0.12)%. Upper limits at 90% confidence level are set to be
B(D0->phiX)<2.5%, B(D+->phiX)<5.0%, and B(D+->phie+X)<1.6%.


title: Search for Scalar Top

abstract:
  We report results of three searches for scalar top quark. Two of the searches
look for direct production of scalar top quark followed by the decay of the
scalar quark to charm quark and neutralino or bottom and chargino. The third
search looks for top quark decaying to scalar top and neutralino followed by
the decay of scalar top to bottom quark and neutralino. We find no evidence for
the presence of scalar top quark in any of the searches. Therefore, depending
on the search we set limits on the production cross-section, $BR(t \to
\tilde{t}_1 + \tilde{\chi}_{1}^{0})$, or $m_{\tilde{t}}$ vs.
$m_{\tilde{\chi}_{1}^{0}}$.


title: B Decay Studies at SLD

abstract:
  We present three preliminary results from SLD on B decays: an inclusive
search for the process b-> s gluon, a measurement of the branching ratio for
the process B -> D D-bar X, and measurements of the charged and neutral B
lifetimes. All three measurements make use of the excellent vertexing
efficiency and resolution of the CCD Vertex Detector and the first two make use
of the excellent particle identification capability of the Cherenkov Ring
Imaging Detector. The b->sg analysis searches for an enhancement of high
momentum charged kaons produced in B decays. Within the context of a simple,
Jetset-inspired model of b->sg, a limit of BR(b->sg) < 7.6% is obtained. The B
-> D D-bar X analysis reconstructs two secondary vertices and uses identified
charged kaons to determine which of these came from charm decays. The result of
the analysis is BR(B -> D D-bar X) = (16.2 +/- 1.9 +/- 4.2)%. The results of
lifetime analysis are: \tau_{B^+} = 1.686 +/-0.025 +/- 0.042 ps, \tau_{B^0} =
1.589 +/- 0.026 +/- 0.055 ps and $\tau_{B^+}/\tau_{B^0} = 1.061 +/-
^{0.031}_{0.029} +/- 0.027.


title: Determination of the upper limit on m_nu_tau from LE

abstract:
  A review of the direct determinations of the upper limit on the tau-neutrino
mass from the LEP experiments is given. The experimental methods, the results
and the comparison with non LEP measurements are also discussed. The study of
the systematic errors shows that the LEP results are statistically limited so
that their combination will improve the sensitivity to a massive tau-neutrino.
An unofficial combination of the ALEPH and OPAL measurements gives a 95%
confidence level upper limit of 15 MeV on the tau-neutrino mass.


title: Constraints on the parameters of the CKM matrix by End 1998

abstract:
  A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix (CKM)
is presented. This paper is an update of the results published in [1]. The
experimental constraints imposed by the measurements of \epsilon_K,
V_{ub}/V_{cb}, \Delta m_d and from the limit on \Delta m_d are used. Values of
the constraints and of the parameters entering into the constraints, which
restrict the range of the \bar{\rho} and \bar{\eta} parameters, include recent
measurements presented at 1998 Summer Conferences and progress obtained by
lattice QCD collaborations. The results are: \bar{\rho}=0.202
^{+0.053}_{-0.059},\bar{\eta}=0.340 \pm 0.035, from which the angles \alpha,
\beta and \gamma of the unitarity triangle are inferred : \sin 2 \alpha = -0.26
^{+ 0.29}_{-0.28} ,\sin 2 \beta = 0.725 ^{+0.050}_{-0.060} ,\gamma=
(59.5^{+8.5}_{-7.5})^{\circ}. Without using the constraint from \epsilon_K,
\sin 2 \beta has been obtained: \sin 2 \beta = 0.72 ^{+0.07}_{-0.11}. Several
external measurements or theoretical inputs have been removed, in turn, from
the constraints and their respective probability density functions have been
obtained. Central values and uncertainties on these quantities have been
compared with actual measurements or theoretical evaluations. In this way it is
possible to quantify the importance of the different measurements and the
coherence of the Standard Model scenario for CP violation. An important result
is that \Delta m_s is expected to be between [12.0-17.6] ps^{-1} with 68% C.L.
and <20 ps^{-1} at 95% C.L. Finally relations between the CKM parameters and
the quark masses are examined within a given model.


title:
Measurement of the Spectroscopy of Orbitally Excited B Mesons with the
  L3 detector

abstract:
  We measure the mass, decay width and production rate of orbitally excited B
mesons in 1.25 million hadronic Z decays registered by the L3 detector in 1994
and 1995. B meson candidates are inclusively reconstructed and combined with
charged pions produced at the event primary vertex. An excess of events above
the expected background is observed in the B\pi mass spectrum near 5.7 GeV.
These events are interpreted as resulting from the decay B^** -> B^(*)pi, where
B^** denotes a mixture of L=1 B meson spin states. The masses and decay widths
of the B^*_2 (j_q = 3/2) and B^*_1 (j_q = 1/2) resonances and the relative
production rate for the combination of all spin states are extracted from a fit
to the mass spectrum.


title: Probing CKM via Semileptonic B Decays at the Upsilon(4S)

abstract:
  Semileptonic decays of B mesons may be used in many different ways to probe
the CKM matrix. Presented here are several recent results from the CLEO II
experiment, all involving the analysis or utilization of semileptonic B decays.


title: The CLEO-III RICH Detector and Beam Test Results

abstract:
  We are constructing a Ring Imaging Cherenkov detector (RICH) for the CLEO III
upgrade for precision charged hadron identification. The RICH uses plane and
sawtooth LiF crystals as radiators, MWPCs as photon detectors with TEA as the
photo-sensitive material, and low-noise Viking readout electronics. Results of
a beam test of the first two out of total 30 sectors are presented.


title: Recent Results from Fermilab Charm Experiment E791

abstract:
  We report the results of some recent E791 charm analyses. They include:
  1) a search for rare and forbidden decays,
  2) measurements of form factors for D+ --> K*,l,nu and Ds --> phi,l,nu, and
  3) Ds and D0 lifetime measurements including the lifetime difference between
D0-->Kpi and D0-->KK. The latter is the first direct search for a possible
lifetime difference that could contribute to D0-D0bar mixing.


title: Standard Model Higgs and Top Mass Measurements at the Tevatron

abstract:
  A summary of the present Standard Model Higgs search and measurement of top
quark mass at the Tevatron are presented. The sensitivity of the present Higgs
search at the Tevatron is limited by statistics to a cross section
approximately two orders of magnitude higher than the predicted cross section
for Standard Model Higgs production. With 30/fb of integrated luminosity, the
Tevatron offers an unique potential discovery window for the Standard Model
Higgs mass up to 130 GeV before LHC era. The study of top at the Tevatron has
moved from discovery phase to one of characterizing its properties. The
combined result of top quark mass is 174.3+- 5.1 GeV.


title: Scalar and Tensor Couplings in Kaon Decays

abstract:
  In the past few years charged kaon experiments have indicated possible scalar
and tensor couplings in semileptonic kaon decays(K --> pi e nu). These
couplings, if correct, are not predicted by the Standard Model and may indicate
the onset of new physics. We present a summary of the existing data and a new,
precision measurement of these couplings in the neutral kaon system based on a
3% subset of the data taken by the KTeV (E799) experiment at Fermilab.


title:
Search for Scalar Top and Scalar Bottom Quarks at sqrt(s) = 189 GeV at
  LEP

abstract:
  Searches for a scalar top quark and a scalar bottom quark have been performed
using a data sample of 182 pb-1 at a centre-of-mass energy of 189 GeV collected
with the OPAL detector at LEP. No evidence for a signal was found. The 95%
confidence level lower limit on the scalar top quark mass is 90.3 GeV if the
mixing angle between the supersymmetric partners of the left- and right-handed
states of the top quark is zero. In the worst case, when the scalar top quark
decouples from the Z boson, the lower limit is 87.2 GeV. These limits were
obtained assuming that the scalar top quark decays into a charm quark and the
lightest neutralino, and that the mass difference between the scalar top quark
and the lightest neutralino is larger than 10 GeV. The complementary decay mode
of the scalar top quark decaying into a bottom quark, a charged lepton and a
scalar neutrino has also been studied. From a search for the scalar bottom
quark, a mass limit of 88.6 GeV was obtained if the mass difference between the
scalar bottom quark and the lightest neutralino is larger than 7 GeV. These
limits significantly improve the previous OPAL limits.


title: Search for charginos nearly mass-degenerate with the lightest neutralino

abstract:
  A search for charginos with masses close to the mass of the lightest
neutralino is reported, based on the data collected with the DELPHI detector at
LEP from 1995 to 1997 at centre-of-mass energies between 130 and 183 GeV. The
signature of a photon at high transverse momentum radiated from the initial
state reduces the two-photon background to acceptable rates, thus making the
mass differences between a few hundred MeV/c^2 and 3 GeV/c^2 detectable. In
very nearly degenerate scenarios, the lifetime of the chargino can be large
enough to produce either visible secondary vertices or decays outside the
detector; therefore, quasi-stable heavy charged particles and displaced decay
vertices were also searched for. No excess of events with respect to the
Standard Model expectations was observed, and limits in the plane of
chargino-neutralino mass difference versus chargino mass are given.


title:
Search for Leptoquarks and FCNC in e^+ e^- annihilations at
  $\sqrt{s}=183 GeV$

abstract:
  A search for events with one jet and at most one isolated lepton used data
taken at LEP-2 by the DELPHI detector.These data were accumulated at a
center-of-mass energy of 183 GeV and correspond to an integrated luminosity of
47.7 1/pb. Production of single scalar and vector leptoquarks was searched for.
Limits at 95% confidence level were derived on the masses (ranging from $134
GeV/c^2$ to $171 GeV/c^2$ for electromagnetic type couplings) and couplings of
the leptoquark states.A search for top-charm flavour changing neutral
currents($e^+ e^- \to \bar t c$ or charge conjugate) used the semileptonic
decay channel. A limit on the flavour changing cross-section via neutral
currents was set at 0.55pb (95% confidence level).


title:
The Scale Dependence of the Hadron Multiplicity in Quark and Gluon Jets
  and a Precise Determination of $C_{A}/C_{F}$

abstract:
  Data collected at the Z resonance using the DELPHI detector at LEP are used
to determine the charged hadron multiplicity in gluon and quark jets as a
function of a transverse momentum-like scale. The colour factor ratio, \cacf,
is directly observed in the increase of multiplicities with that scale. The
smaller than expected multiplicity ratio in gluon to quark jets is understood
by differences in the hadronization of the leading quark or gluon. From the
dependence of the charged hadron multiplicity on the opening angle in symmetric
three-jet events the colour factor ratio is measured to be: C_A/C_F = 2.246 \pm
0.062 (stat.) \pm 0.080 (syst.) \pm 0.095 (theo.)


title:
Measurement of the forward backward asymmetry of c and b quarks at the Z
  pole using reconstructed D mesons

abstract:
  A measurement of the forward--backward asymmetry of $e^{+}e^{-} \to c\bar{c}$
and $e^{+}e^{-} \to b\bar{b}$ on the $Z$ resonance is performed using about 3.5
million hadronic $Z$ decays collected by the DELPHI detector at LEP in the
years 1992 to 1995. The heavy quark is tagged by the exclusive reconstruction
of several $D$ meson decay modes. The forward--backward asymmetries for $c$ and
$b$ quarks at the $Z$ resonance are determined to be: \[
\renewcommand{\arraystretch}{1.6} \begin{array}{rcr@{}l} \Afbc(\sqrt{s} =
91.235 {\rm GeV}) &=& &0.0659 \pm 0.0094 (stat) \pm 0.0035 (syst) \Afbb
(\sqrt{s} = 91.235 {\rm GeV}) &=& &0.0762 \pm 0.0194 (stat) \pm 0.0085 (syst)
  \Afbc(\sqrt{s} = 89.434 {\rm GeV}) &=&-&0.0496 \pm 0.0368 (stat) \pm 0.0053
(syst) \Afbb(\sqrt{s} = 89.434 {\rm GeV}) &=& &0.0567 \pm 0.0756 (stat) \pm
0.0117 (syst) \Afbc(\sqrt{s} = 92.990 {\rm GeV}) &=& &0.1180 \pm 0.0318 (stat)
\pm 0.0062 (syst) \Afbb(\sqrt{s} = 92.990 {\rm GeV}) &=& &0.0882 \pm 0.0633
(stat) \pm 0.0122 (syst) \end{array} \] The combination of these results leads
to an effective electroweak mixing angle of: SINEFF = 0.2332 \pm 0.0016


title: Neutrino-induced deuteron disintegration experiment

abstract:
  Cross sections for the disintegration of the deuteron via neutral-current
(NCD) and charged-current (CCD) interactions with reactor antineutrinos are
measured to be 6.08 +/- 0.77 x 10^(-45) cm-sq and 9.83 +/- 2.04 x 10^(-45)
cm-sq per neutrino, respectively, in excellent agreement with current
calculations. Since the experimental NCD value depends upon the CCD value, if
we use the theoretical value for the CCD reaction, we obtain the improved value
of 5.98 +/- 0.54 x 10^(-45) for the NCD cross section. The neutral-current
reaction allows a unique measurement of the isovector-axial vector coupling
constant in the hadronic weak interaction (beta). In the standard model, this
constant is predicted to be exactly 1, independent of the Weinberg angle. We
measure a value of beta^2 = 1.01 +/- 0.16. Using the above improved value for
the NCD cross section, beta^2 becomes 0.99 +/- 0.10.


title:
Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1
  (GeV/c)^2 < Q^2 < 40 (GeV/c)^2

abstract:
  New measurements are reported on the deuteron spin structure function g_1^d.
These results were obtained from deep inelastic scattering of 48.3 GeV
electrons on polarized deuterons in the kinematic range 0.01 < x < 0.9 and 1 <
Q^2 < 40 (GeV/c)^2. These are the first high dose electron scattering data
obtained using lithium deuteride (6Li2H) as the target material. Extrapolations
of the data were performed to obtain moments of g_1^d, including Gamma_1^d, and
the net quark polarization Delta Sigma.


title: Search for Supernarrow Dibaryons in pd Interactions

abstract:
  The reaction pd-->pX at 305 MeV is studied with the aim to search for
supernarrow dibaryons, the decay of which into two nucleons is forbidden by the
Pauli exclusion principle. The experiment was carried out at the Moscow Meson
Factory using the spectrometer TAMS, which detected the scattered proton in
coincidence with another charged particle (either p or d) from the decay of
particle X. The detection of the second charged particle at angles close to the
emission angle of particle X with mass M allows to suppress essentially the
contribution of background processes and to increase the relative contribution
of a possible production of the dibaryons under consideration. Narrow peaks in
missing mass spectra have been observed at 1905 and 1924 MeV with the
statistical significance of ~4.8 SD. The widths of both observed peaks
correspond to the experimental resolution (3 MeV). Comparison of the obtained
data with theoretical predictions leads to the conclusion that the peak found
at 1905 MeV most likely corresponds to a supernarrow dibaryon with the isotopic
spin equal to 1. The possible origin of the peak at 1924 MeV is also discussed.


title: Heavy Quark Asymmetries at LEP

abstract:
  Measurements of b and c quark asymmetries using data collected at LEP 1 are
described. The relative merits of each of the individual techniques used is
emphasised as is the most profitable way of combining them. Effects of
radiative corrections are discussed, together with the impact of these
measurements on global electroweak fits used to estimate the expected mass of
the Higgs boson.


title: The CRESST Dark Matter Search

abstract:
  The current status of CRESST (Cryogenic Rare Event Search using
Superconducting Thermometers) and new results concerning the detector
development are presented. The basic technique of CRESST is to search for
particle Dark Matter (WIMPS, Weakly Interacting Massive particles) by the
measurement of non-thermal phonons as created by WIMP-induced nuclear recoils.
Combined with the newly developed method of simultaneous measurement of
scintillation light, strong background discrimination is possible, resulting in
a substantial increase in WIMP detection sensitivity. The short and long term
perspectives of CRESST are discussed.


title: Higgs Searches and Prospects from LEP2

abstract:
  The status of the search at LEP2 for the Higgs in the Standard Model (SM) and
in the minimal supersymmetric extension of the Standard Model MSSM) is
reviewed. A preliminary lower limit of 95.5/c^2 at 95% C.L. on the SM Higgs is
obtained after a preliminary analysis of the data collected at sqrt(s)= 189
GeV. For standard choices of MSSM parameter sets, the search for the neutral
Higgs bosons h and A leads to preliminary 95% C.L. exclusion lower limits of
83.5GeV/c^2 and 84.5 GeV/c^2, respectively.


title:
Electroweak results from the Z resonance cross-sections and leptonic
  forward-backward asymmetries with the ALEPH detector

abstract:
  The measurement of the Z resonance parameters and lepton forward-backward
asymmetries are presented. These are determined from a sample of 4.5 million Z
decays accumulated with the ALEPH detector at LEP1.


title: Charmless Hadronic B Decays at CLEO

abstract:
  The CLEO collaboration has studied two-body charmless hadronic decays of $B$
mesons into final states containing two pseudo-scalar mesons, or a
pseudo-scalar and a vector meson. We summarize and discuss results presented
during the winter/spring 1999 conference season, and provide a brief outlook
towards future attractions to come.
  In particular, CLEO presented preliminary results on the decays $B^\pm \to
\pi^\pm\rho^0$ ($Br(B^\pm \to \pi^\pm\rho^0) = (1.5 \pm 0.5 \pm 0.4)\times
10^{-5}$), $B\to \pi^\pm\rho^\mp$ ($Br(B\to
\pi^\pm\rho^\mp)=(3.5^{+1.1}_{-1.0}\pm 0.5)\times 10^{-5}$), $B\to \pi^\pm
K^{\star\mp}$ ($Br(B\to \pi^\pm K^{\star\mp}) =
(2.2^{+0.8+0.4}_{-0.6-0.5})\times 10^{-5}$), and $B^\pm \to K^\pm \pi^0$
($Br(B^\pm \to K^\pm \pi^0) = (1.5 \pm 0.4 \pm 0.3) \times 10^{-5}$) at DPF99,
APS99, APS99, and ICHEP98 respectively. None of these decays had been observed
previously. The first two of these constitute the first observation of hadronic
$b\to u$ transitions. In addition, CLEO presented preliminary updates on a
large number of previously published branching fractions and upper limits.


title: Studies of B0 Decays for Measuring sin(2*beta)

abstract:
  Future asymmetric e+e- --> Upsilon(4S) B factories are being constructed to
search for CP violation in B0 decays. It is hoped that a CP asymmetry may be
observed in B0-B0bar mixing in analogy with that found in neutral kaons. In
this mixing measurement, B0 decays to CP eigenstates, such as the rare decay B0
psi Kshort, may provide information on the CKM angle sin(2beta). I discuss
decay additional CP eigenstate branching ratios measured by the CLEO experiment
that may be used by future B factories to measure sin(2beta).


title: Search for Long-lived Charged Massive Particles at CDF

abstract:
  A search for long-lived charged massive particles in CDF's Run1b data sample
is presented. The search looks for highly ionizing tracks which would result
from slowly moving massive particles. We search for strongly produced particles
using a stable color triplet quark as a reference model, and a separate search
was performed for weakly produced particles using long-lived sleptons in Gauge
Mediated Supersymmetry Breaking as a reference model. No excess over background
was observed, and we derive limits on the cross-sections for production of
these particles. Prospects for RunII are also discussed.


title: Study of Fermion pair production in e+e- collisions at 130-183 GeV

abstract:
  The cross sections and forward-backward asymmetries of hadronic and leptonic
events produced in e+e- collisions at centre-of-mass energies of 130-183 GeV
are presented. Results for ee, mumu, tautau, qq, bb and cc production show no
significant deviation from the Standard Model predictions. This enable
constraints to be set upon physics beyond the Standard Model such as
four-fermion contact interactions, leptoquarks, Z' bosons and R-parity
violating squarks and sneutrinos. Limits on the energy scale Lambda of eeff
contact interactions are typically in the range from 2-10 TeV. Limits on
R-parity violating sneutrinos reach masses of a few hundred GeV for large
values of their Yukawa couplings.


title: Summary of Expermental Electroweak Physics

abstract:
  Progress continues on many fronts of experimental testing of electroweak
symmetry breaking. Updates were presented on LEP, SLC, Brookhaven g-2 ring,
Tevatron Collider, HERA, CESR and Tevatron neutrino experiments. Perhaps most
exciting is the Higgs search at LEP2, complementing the indirect constraints.
However, the standard model with one Higgs doublet remains viable.


title:
Test of the Flavour Independence of alpha_s using Next-to-Leading Order
  Calculations for Heavy Quarks

abstract:
  We present a test of the flavour independence of the strong coupling constant
for charm and bottom quarks with respect to light (uds) quarks, based on a
hadronic event sample obtained with the OPAL detector at LEP. Five observables
related to global event shapes were used to measure alpha_s in three flavour
tagged samples (uds, c and b). The event shape distributions were fitted by
Order(alpha_s**2) calculations of jet production taking into account mass
effects for the c and b quarks. We find: = 0.997 +- 0.038(stat.) +-
0.030(syst.) +- 0.012(theory) and = 0.993 +- 0.008(stat.) +- 0.006(syst.) +-
0.011(theory) for the ratios alpha_s(charm)/alpha_s(uds) and
alpha_s(b)/alpha_s(uds) respectively.


title:
Event-by-event fluctuations of average transverse momentum in central
  Pb+Pb collisions at 158 GeV per nucleon

abstract:
  We present first data on event-by-event fluctuations in the average
transverse momentum of charged particles produced in Pb+Pb collisions at the
CERN SPS. This measurement provides previously unavailable information allowing
sensitive tests of microscopic and thermodynamic collision models and to search
for fluctuations expected to occur in the vicinity of the predicted QCD phase
transition. We find that the observed variance of the event-by-event average
transverse momentum is consistent with independent particle production modified
by the known two-particle correlations due to quantum statistics and final
state interactions and folded with the resolution of the NA49 apparatus. For
two specific models of non-statistical fluctuations in transverse momentum
limits are derived in terms of fluctuation amplitude. We show that a
significant part of the parameter space for a model of isospin fluctuations
predicted as a consequence of chiral symmetry restoration in a non-equilibrium
scenario is excluded by our measurement.


title: Search for R-Parity Violating Decays of Scalar Fermions at LEP

abstract:
  A search for pair produced scalar fermions with couplings that violate
R-parity has been performed using a data sample corresponding to an integrated
luminosity of 56 pb-1 at a centre-of-mass energy of sqrt{s}= 183 GeV collected
with the OPAL detector at LEP. An important consequence of R-parity breaking
interactions is that the lightest supersymmetric particle is expected to be
unstable. Searches for R-parity violating decays of charged sleptons,
sneutrinos and stop quarks have been performed under the assumptions that the
lightest supersymmetric particle decays promptly and that only one of the
R-parity violating couplings is dominant for each of the decay modes
considered. Such processes would yield multi-leptons, jets plus leptons or
multi-jets, with or without missing energy, in the final state. No significant
excess of such events has been observed. Limits on the production
cross-sections of scalar fermions in R-parity violating scenarios are obtained.
Mass exclusion regions are also presented in the framework of the Constrained
Minimal Supersymmetric Standard Model.


title: Precision Electroweak Measurements at the SLC : Overview and Perspective

abstract:
  Preliminary SLD electroweak results based on essentially the complete 550K Z
dataset are presented and interpreted, and some historical background is
provided.


title:
Mixing and CP-Violation Measurements of $B^0$ Mesons from the Tevatron
  Collider

abstract:
  $B^0$ mixing measurements from the Tevatron Run I data are reported. These
include time-integrated measurements of the average mixing parameter
$\bar{\chi}$, six time-dependent oscillation measurements of $\Delta m_d$, and
a time-dependent limit on $\Delta m_s$. Such measurements provide constraints
on CKM matrix elements. A sample of $B^0/\bar{B}{^0} \to J/\psi K^0_S$ decays
is used to directly measure the CP-violation parameter $\sin(2\beta)$. This
value agrees well with indirect constraints on the CKM matrix.


title: Physics of W bosons at LEP2

abstract:
  After the first observations of W bosons in leptonic interactions, about 4000
WW candidate events per experiment have been collected at LEP2. This data
allows the measurement of the WW production cross section at different
centre-of-mass energies, as well as W decay branching fractions. The W hadronic
branching fraction can be converted into a test of the unitarity of the CKM
matrix, or into an indirect determination of the matrix element $|V_{cs}|$. A
more direct measurement coming from charm tagging is also performed. The W mass
has been measured via the cross section (in the threshold region) and the
direct reconstruction of the W decay products, using different techniques to
account for the distortions due to experimental effects. The main systematic
error to the mass reconstruction in the fully hadronic channel comes from QCD
effects like Color reconnections and Bose-Einstein correlations, extensively
studied in WW events. In $e^+e^-$ collisions W pairs can be produced in
s-channel via a three vector boson vertex, so a direct study of the trilinear
gauge boson couplings is possible. Modification of WW cross section and
distributions of W production and decay angles would be an indication of
non-standard couplings, thus a first hint for the presence of new physics.


title: Physics with the Main Injector

abstract:
  The Main Injector is a new rapid cycling accelerator at Fermilab which is a
source of protons to be used in antiproton production to enhance the luminosity
of the Tevatron Collider and to provide extracted beams for use in a range of
fixed target experiments. We discuss the current status of the accelerator and
the physics which it enables. The physics ranges broadly over the standard
model and beyond, from the search for neutrino mass to collider physics at the
highest energy available today.


title:
Search for proton decay through p->\bar{\nu} K^+ in a large water
  Cherenkov detector

abstract:
  We present results of a search for proton decays, $p \to \bar{\nu} K^+$,
using data from a 33 kton$\cdot$year exposure of the Super-Kamiokande detector.
Two decay modes of the kaon, $K^+ \to \mu^+ \nu_{\mu}$ and $K^+ \to \pi^+
\pi^0$, were studied. The data were consistent with the background expected
from atmospheric neutrinos; therefore a lower limit on the partial lifetime of
the proton $\tau / B(p \to \bar{\nu} K^+)$ was found to be $6.7 \times 10^{32}$
years at 90% confidence level.


title: Flavor Tagging and CP-Violation Measurements at the Tevatron

abstract:
  The CDF Collaboration has adapted several heavy flavor tagging techniques and
employed them in analyses of time-dependent flavor asymmetries using data from
the Tevatron Run I. The tagging algorithms were calibrated using low-P_t
inclusive lepton and dilepton trigger data samples. The tagging techniques were
applied to a sample of \sim 400 B^0_d/B-bar^0_d -> J/psi K^0_s decays and were
used to measure the CP violation parameter, sin(2 Beta). Prospects for future
improved measurements of the CP violation parameters at the Tevatron are
briefly discussed.


title:
Implication of W-boson Charge Asymmetry Measurements in p-pbar
  Collisions for Models of Charge Symmetry Violations in Parton Distributions

abstract:
  A surprisingly large charge symmetry violation of the sea quarks in the
nucleon has been proposed in a recent article by Boros et al. as an explanation
of the discrepancy between neutrino (CCFR) and muon (NMC) nucleon structure
function data at low x. We show that these models are ruled out by the
published CDF W charge asymmetry measurements, which strongly constrain the
ratio of d and u quark momentum distributions in the proton over the x range of
0.006 to 0.34. This constraint also limits the systematic error from possible
charge symmetry violation in the determination of sin^2(theta) from nu-N
scattering experiments.


title:
Search for Second Generation Leptoquark Pairs Decaying to \mu\nu + jets
  in p-pbar Collisions at sqrt{s} = 1.8 TeV

abstract:
  We report on a search for second generation leptoquarks (LQ) produced in
$p\bar{p}$ collisions at sqrt{s} = 1.8 TeV using the D0 detector at Fermilab.
Second generation leptoquarks are assumed to be produced in pairs and to decay
to either \mu or \nu and either a strange or a charm quark (q). Limits are
placed on \sigma(p-pbar -> LQ-LQbar -> \mu\nu + jets) as a function of the mass
of the leptoquark. For equal branching ratios to \mu q and \nu q, second
generation scalar leptoquarks with a mass below 160 GeV/c^2, vector leptoquarks
with anomalous minimal vector couplings with a mass below 240 GeV/c^2, and
vector leptoquarks with Yang-Mills couplings with a mass below 290 GeV/c^2, are
excluded at the 95% confidence level.


title:
a_1(1260) dominance in the process e+e- \to 4\pi at energies 1.05--1.38
  GeV

abstract:
  First results of the study of the process e+e- \to 4\pi by the CMD-2
collaboration at VEPP-2M are presented for the energy range 1.05--1.38 GeV.
Using an integrated luminosity of 5.8 pb^{-1}, energy dependence of the
processes e+e- \to \pi^+\pi^- 2\pi^0 and e+e- \to 2\pi^+ 2\pi^- has been
measured. Analysis of the differential distributions demonstrates the dominance
of the a_1\pi and \omega\pi intermediate states. Upper limits for the
contributions of other alternative mechanisms are also placed.


title: Estimation of Upper Limits Using a Poisson Statistic

abstract:
  Bayesian, classical, and extended maximum likelihood approaches to estimation
of upper limits in experiments with small numbers of signal events are
surveyed. The discussion covers only experiments whose outcomes are well
described by a Poisson statistic. A new approach, based on the statistical
significance of a signal rather than on the number of events in the signal
region, is proposed. A toy model and an example of a recent search for the
lepton number violating decay $\tau\to\mu\gamma$ are used to illustrate
application of the discussed techniques.


title: K+ -> pi+ mu+ mu- in E865 at BNL

abstract:
  Preliminary values for the K+ -> pi+ mu+ mu- branching ratio and form factor
are reported, based on 400 events, a factor of 2 more in total events and 100
times the present world sample of fully reconstructed events. The results are
consistent with previous results on the pi+ e+ e- mode. However, the relatively
large slope of the form factor in q^2, lambda = 0.182+/-0.01+/-0.007, required
to fit the pi+ e+ e- data and to give consistency between the pi+ e+ e- and pi+
mu+ mu- branching ratios, is larger than expected in simple models of the
decays. The K+ -> pi+ mu+ mu- branching ratio we find, (9.23 +/- 0.6 stat +/-
0.58 syst)x10^-8, is the most precise measurement of this mode and is
approximately 3.2 sigma larger than the previous measurement. These pi+ l+ l-
results are inconsistent with O(p^4) Chiral Perturbation Theory but compatible
with O(p^6). Systematic studies for both modes are still in progress.


title:
Measurement of e+e- -> pi+pi- cross section with CMD-2 around rho(770)
  meson

abstract:
  In experiments with the CMD-2 detector at the VEPP-2M electron-positron
collider at Novosibirsk about 150000 $e^+e^-\to\pi^+\pi^-$ events were recorded
in the center-of-mass energy range from 0.61 up to 0.96 GeV. The result of the
pion form factor measurement with a 1.4% systematic error is presented. The
following values of the $\rho$-meson and $\rho-\omega$ interference parameters
were found: $M_\rho=(775.28\pm 0.61\pm 0.20) MeV, \Gamma_\rho=(147.70\pm 1.29
\pm 0.40) MeV, \Gamma(\rho\to e^+e^-)=(6.93\pm 0.11\pm 0.10) keV,
Br(\omega\to\pi^+\pi^-) = (1.32\pm 0.23)%$.


title: Measurement of sin^2 theta_W in nu N Scattering from NuTeV

abstract:
  We report the measurement of sin^2 theta_W in nu N deep inelastic scattering
from the NuTeV experiment. By using separate neutrino and anti-neutrino beams,
NuTeV is able to determine sin^2 theta_W with smaller systematic and similar or
smaller statistical errors when compared to previous neutrino experiments.
NuTeV measures sin^2 theta_W (on-shell) = 0.2253 +/- 0.0019(stat.) +/-
0.0010(sys.), which implies M_W = 80.26 +/- 0.11 GeV/c^2.


title: Birefringence of high-energy gamma-quanta in the single crystals

abstract:
  Problems of the experimental observation of the birefringence of high-energy
gamma-quanta propagating in single crystals are discussed.


title: Jet Cross Sections at HERA - Current Issues

abstract:
  Since the start of HERA operation there has been considerable progress in the
understanding of jet production in e p collisions. QCD calculations are now
able to accommodate the hadronic structure of the virtual photon. The
luminosities delivered by HERA are now sufficient to allow studies of final
states in which more than two high transverse energy jets are produced. The
transition between jet processes in photoproduction and in deep inelastic
scattering has been studied in some detail. These advances are highlighted
here.


title: Nuclearite search with the MACRO detector at Gran Sasso

abstract:
  In this paper we present the results of a search for nuclearites in the
penetrating cosmic radiation using the scintillator and track-etch subdetectors
of the MACRO apparatus. The analyses cover the beta =v/c range at the detector
depth (3700 hg/cm^2) 10^-5 < beta < 1; for beta = 2 x 10^-3 the flux limit is
2.7 x 10^-16 cm^-2 s^-1 sr^-1 for an isotropic flux of nuclearites, and twice
this value for a flux of downgoing nuclearites.


title: Hadronic Shower Development in Iron-Scintillator Tile Calorimetry

abstract:
  The lateral and longitudinal profiles of hadronic showers detected by a
prototype of the ATLAS Iron-Scintillator Tile Hadron Calorimeter have been
investigated. This calorimeter uses a unique longitudinal configuration of
scintillator tiles. Using a fine-grained pion beam scan at 100 GeV, a detailed
picture of transverse shower behavior is obtained. The underlying radial energy
densities for four depth segments and for the entire calorimeter have been
reconstructed. A three-dimensional hadronic shower parametrization has been
developed. The results presented here are useful for understanding the
performance of iron-scintillator calorimeters, for developing fast simulations
of hadronic showers, for many calorimetry problems requiring the integration of
a shower energy deposition in a volume and for future calorimeter design.


title: Event shapes and power corrections in e+e- annihilitions

abstract:
  Hadronic final states in e+e- annihilitions at centre-of-mass energies from
14GeV up to 189GeV are studied in order to test recent predictions for power
corrections to the mean values as well as the distributions of event shape
variables.


title:
First Results from Dark Matter Search Experiment in the Nokogiriyama
  Underground Cell

abstract:
  An experiment to search for hypothetical particle dark matter using cryogenic
thermal detector, or bolometer is ongoing. The bolometer consists of eight
pieces of 21 g LiF absorbers and sensitive NTD germanium thermistors attached
to them and is installed in the Nokogiriyama underground cell which is a
shallow depth site ($\sim 15$ m w.e.). We report on the results from the first
running for about ten days using this arrayed bolometer system together with
appropriate shieldings and muon veto counters. From the obtained energy spectra
the exclusion limits for the cross section of the elastic neutralino-proton
scattering are derived under commonly accepted astrophysical assumptions. The
sensitivity for the light neutralino with a mass below 5 GeV is improved by
this work.


title: Natural parity resonances in the etha pi+ pi- and omega omega

abstract:
  Results of the ethapi+pi- and omegaomega final state partial wave
analysis(PWA) are presented. The mass-independent and the mass-dependent PWA
were performed. The ethapi+pi- system PWA results in the observation of the
resonances in the JPC=1--,3--,2++ and 4++ waves. The results of the omegaomega
system PWA confirms the existence of the f2(1565) and f4(2050). The f2(1950) is
observed. There is evidence for a f4(2300) meson.


title: New results from VES

abstract:
  The results of the patial wave analysis(PWA) of the pi+pi-pi- and omegapi-pi0
systems are presented. The a3 and a4(2040) signals are observed in the
rho(770)pi and f2(1270)pi channels. Indications of the a1' meson existence was
found in the 1+0+ rhopi S-wave. The decay branching ratio of the a2(1320)- to
omegapi-pi0 was measured. The 2+1+ wave shows a broad bump at M~1.7GeV. The
decays of the pi2(1670), a4(2040) and pi(1740) into omegarho- were found. The
resonance in the b1(1235)pi wave with exotic quantum numbers jpc=1-+ at M~1.6
is observed and the simultaneous analysis of the 1-+ wave in the b1(1235)pi,
etha'pi and rhopi final states is presented.


title: First Charm Baryon Physics from SELEX (E781)

abstract:
  We present preliminary results on various aspects of charm baryon studies at
the 1996-1997 fixed target experiment of Fermilab studying charm produced from
incident Sigma, proton, and pion beams at 600 GeV. First results include the
comparison of hadroproduction asymmetries for $Lambda_c^+$ production from the
3 beams as well x_F distributions and the first observation of the
Cabbibo-suppressed decay $\Xi_c^+ \to p K^- \pi^+$. The relative branching
fraction of the Cabbibo-suppressed mode to the 3-body Cabbibo-favored modes is
also presented.


title:
Search for the Flavor-Changing Neutral Current Decays B^+ -> mu^+ mu^-
  K^+ and B^0 -> mu^+ mu^-K^{*0}

abstract:
  We report on a search for the flavor-changing neutral current decays B^+ ->
mu^+ mu^- K^+ and B^0 -> mu^+ mu^- K^{*0} using 88 pb^{-1} of data from p-pbar
collisions at \sqrt{s}=1.8 TeV, collected with the Collider Detector at
Fermilab. Finding no evidence for these decays, we set upper limits on the
branching fractions B(B^+ -> mu^+ mu^- K^+) < 5.2x10^{-6} and B(B^0 -> mu^+
mu^-K^{*0}) < 4.0x10^{-6} at the 90% confidence level.


title:
Studies of WW and WZ Production and Limits on Anomalous WWgamma and WWZ
  Couplings

abstract:
  Evidence of anomalous WW and WZ production was sought in pbar{p} collisions
at a center-of-mass energy of sqrt(s) = 1.8 TeV.
  The final states $WW (WZ) to mu-nu-jet-jet + X, WZ to mu-nu-e-e + X and WZ to
e-nu-e-e + X were studied using a data sample corresponding to an integrated
luminosity of approximately 90 pb-1. No evidence of anomalous diboson
production was found. Limits were set on anomalous WWgamma and WWZ couplings
and were combined with our previous results. The combined 95% confidence level
anomalous coupling limits for Lambda=2 TeV are -0.25 LE Delta-kappa LE 0.39
(lambda=0) and -0.18 LE lambda LE 0.19 (Delta \kappa = 0), assuming the WWgamma
couplings are equal to the WWZ couplings.


title: Imaging Gaseous Detector based on Micro Processing Technology

abstract:
  The development of gaseous detectors has been exciting again since the
appearance of a MicroStrip Gas Chamber(MSGC) in 1988, which is made using a
micro-electronics technology. These days lots of variations of the advanced
gaseous detectors are being intensively studied in the world.
  We have developed the two-dimensional MSGC having a 10 cm square detection
area and the ultra fast readout system for a real time X-ray imaging. The MSGC
was made using Multi-Chip Module (MCM) technology, and has a very thin
substrate of 17 $\mu$m, lots of thin anodes and back strips both with 200
$\mu$m pitches. This enables us to get fast digital X-ray images with recording
both the timing and an energy of each X-ray photon. In addition, an
intermediate gas multiplier has been realized using a capillary plate having a
conductive surface of a capillary. The MSGC combined with the conductive
capillary plate can be steadily operated with a high gain under intense
irradiation. Here we also report new approaches of X-ray crystal structure
analyses using timing information obtained by the MSGC.


title:
Dispersion relation analysis of the neutral kaon regeneration amplitude
  in carbon

abstract:
  We apply a forward dispersion relation to the regeneration amplitude for kaon
scattering on 12C using all available data. The CPLEAR data at low energies
allow the determination of the net contribution from the subthreshold region
which turns out to be much smaller than earlier evaluations, solving a long
standing puzzle.


title: Charm Photoproduction in ep Collisions at HERA

abstract:
  We report the latest results of the ZEUS collaboration on the photoproduction
of D* mesons in a low W range. Differential cross sections as function of
pt(D*) and eta(D*) are measured and compared with several recent NLO pQCD
calculations. The differential cross-sections in a restricted kinematical
region are higher than the NLO calculations, in particular in the forward
(proton) direction. A recent pQCD model (BKL) describes the data reasonably
well.


title: Diffractive Results from the Tevatron

abstract:
  Hard diffraction in events with dijets and rapidity gaps has been studied by
D\O and CDF for three processes: hard color singlet exchange, hard single
diffraction, and hard double pomeron exchange, using Tevatron $\bar pp$ data at
$\sqrt{s}$ = 630 GeV and 1.8 TeV. Measurements of rates, $\eta, E_T$ and
$\sqrt{s}$ dependencies are presented and comparisons made with predictions of
several models.


title: Towards Low-Threshold, Real-Time Solar Neutrino Detectors

abstract:
  We discuss an alternative approach to the detection of solar neutrinos using
a coarsely segmented detector based on inverse-beta decay onto $^{160}$Gd or
$^{176}$Yb. While it is know that similar approaches, already discussed in the
literature, can in principle provide low-threshold, real-time energy
spectroscopy with intrinsic background rejection features, the concepts
presented here make this scheme possible with lower background and current
technology.


title: Neutrino Oscillation Experiments at Nuclear Reactors

abstract:
  In this paper I give an overview of the status of neutrino oscillation
experiments performed using nuclear reactors as sources of neutrinos. I review
the present generation of experiments (Chooz and Palo Verde) with baselines of
about 1 km as well as the next generation that will search for oscillations
with a baseline of about 100 km. While the present detectors provide essential
input towards the understanding of the atmospheric neutrino anomaly, in the
future, the KamLAND reactor experiment represents our best opportunity to study
very small mass neutrino mixing in laboratory conditions. In addition KamLAND
with its very large fiducial mass and low energy threshold, will also be
sensitive to a broad range of different physics.


title:
Balloon Measurements of Cosmic Ray Muon Spectra in the Atmosphere along
  with those of Primary Protons and Helium Nuclei over Mid-Latitude

abstract:
  We report here the measurements of the energy spectra of atmospheric muons
and of the cosmic ray primary proton and helium nuclei in a single experiment.
These were carried out using the MASS superconducting spectrometer in a balloon
flight experiment in 1991. The relevance of these results to the atmospheric
neutrino anomaly is emphasized. In particular, this approach allows
uncertainties caused by the level of solar modulation, the geomagnetic cut-off
of the primaries and possible experimental systematics to be decoupled in the
comparison of calculated fluxes of muons to measured muon fluxes. The muon
observations cover the momentum and depth ranges of 0.3-40 GeV/c and 5-886
g/cmsquared, respectively. The proton and helium primary measurements cover the
rigidity range from 3 to 100 GV, in which both the solar modulation and the
geomagnetic cut-off affect the energy spectra at low energies.


title: New Limit for the Family-Number Non-conserving Decay mu+ to e+_gamma

abstract:
  An experiment has been performed to search for the muon- and electron-number
non-conserving decay mu+ to e+_gamma. The upper limit for the branching ratio
to be GAMMA(mu+ to e+_gamma)/GAMMA(mu+ to e+_nu_nubar) < 1.2e-11 with 90%
confidence.


title: Status of the Study of the Rare Decay K^+ \to \pi^+ \nu \bar\nu at BNL

abstract:
  The current status of the experimental study of the rare kaon decay K^+ \to
\pi^+ \nu \bar\nu at Brookhaven National Laboratory (BNL) by the E787 and E949
collaborations is reported.


title: Electroweak Results from the SLD Experiment

abstract:
  We present an overview of the electroweak physics program of the SLD
experiment at the Stanford Linear Accelerator Center (SLAC). A data sample of
550K Z0 decays has been collected. This experiment utilizes a highly polarized
electron beam, a small interaction volume, and a very precise pixel vertex
detector. We present a preliminary result for the weak mixing angle,
sin2(thetaw)=0.23110 +- 0.00029. We also present a preliminary result for the
parity violating parameter, A_b = 0.898 +- 0.029. These measurements are used
to test for physics beyond the Standard Model.


title: Atmospheric Neutrinos at Super-Kamiokande

abstract:
  In 1998, the Super-Kamiokande announced evidence for the observation of
neutrino oscillations based on measurements of the atmospheric neutrino flux.
This paper presents the updated results for fully and partially-contained
events with 736 days of data, as well as upward-going muon results and a global
analysis. Preliminary interpretations of the results in terms of various
two-flavor oscillation hypotheses are presented.


title: Recent Results on Heavy Flavours with ALEPH

abstract:
  The latest ALEPH measurements on heavy flavours are presented. In particular
the measurements of V_ub, the B(b -> s gamma) and a study on the width
difference between mass eigenstates in the B_s system are presented.


title: Transition Radiation Detector in MACRO

abstract:
  The MACRO detector is located in the Gran Sasso Laboratory. MACRO's
overburden varies from 3150 to 7000 hg/cm^2. A transition radiation detector
(TRD) has been added to the MACRO detector in order to measure the residual
energy of muons entering MACRO, i.e. the energy they have after passing through
the Gran Sasso's rock overburden. The TRD consists of three identical modules
with a total horizontal area of 36 m^2. The results presented here are referred
to single and double events in MACRO with one muon crossing one of the TRD
modules. Our data show that double muons are more energetic than single ones,
as predicted by the interaction models of primary cosmic rays with the
atmosphere.


title:
Capabilities of an Underwater Detector as a Neutrino Telescope and for
  the Neutrino Oscillation Search

abstract:
  We report on the results of a Monte Carlo simulation study of a km^3 scale
deep underwater Cherenkov detector aimed at detecting neutrinos of
astrophysical origin. This analysis has been undertaken as part of the NEMO R&D
project to develop such an experiment close to the Southern Italian coasts. We
have studied the reconstruction capabilities of various arrays of phototubes in
order to determine the detector geometries which optimize performance and cost.
We have also investigated the possibility of designing a detector with
characteristics suited to an experiment on atmospheric neutrino oscillations.


title: MACRO as a Telescope for Neutrino Astronomy

abstract:
  We use a sample of 990 upward-going muons, induced primarily by atmospheric
neutrinos, to search for neutrinos of astrophysical origin. No evidence has
been found using the event direction information. Flux limits of the order of
10^-15 cm^-2 s^-1 are imposed on current models for candidate point-sources. A
space-time correlation search has been undertaken between 2328 BATSE gamma ray
bursts (GRBs) and MACRO upward-going muons.


title: Search for WIMPS using Upward-Going Muons in MACRO

abstract:
  We present updated results on the search for a neutrino signal from the core
of the Earth and of the Sun induced by Weakly Interacting Massive Particles
(WIMPs). In this paper we concentrate on neutralinos as WIMP candidates. The
971 and 642 events used respectively for the search from the Sun and from the
Earth are compatible with the background of atmospheric neutrinos. Consequently
we calculate flux limits for various search cones around these sources. Limits
as a function of the neutralino mass are given and compared to the
supersymmetric (SUSY) models.


title: Observation of $K_S^0$ semileptonic decays with CMD-2 detector

abstract:
  The decay $K_S^0 \to \pi e \nu$ has been observed by the CMD-2 detector at
the e^+e^- collider VEPP-2M at Novosibirsk. Of 6 million produced $K_L^0K_S^0$
pairs, $75 \pm 13$ events of the $K_S^0 \to \pi e \nu$ decay were selected. The
corresponding branching ratio is $B(K_S^0 \to \pi e \nu)=(7.2 \pm
1.4)\times10^{-4}$. This result is consistent with the evaluation of $B(K_S^0
\to \pi e \nu)$ from the $K_L^0$ semileptonic rate and $K_S^0$ lifetime
assuming $\Delta S=\Delta Q$ .


title: Search for Magnetic Monopoles with MACRO

abstract:
  Data from the complete MACRO detector have been used to search for magnetic
monopoles (MMs) of all expected velocities. Scintillator, streamer tube
(instrumented with specialized electronics) and nuclear track detectors have
been used to search for signatures coming from MMs; the scintillator and
nuclear track subdetectors were used also for searches for other rare particles
(nuclearites, charged Q-balls). Based on no observation of such signals, we
establish strigent flux limits, for MMs as slow as a few 10^-5c.


title:
The b-bbar Production Cross Section and Angular Correlations in p-pbar
  Collisions at sqrt(s) = 1.8 TeV

abstract:
  We present measurements of the b-bbar production cross section and angular
correlations using the D0 detector at the Fermilab Tevatron p-pbar Collider
operating at sqrt(s) = 1.8 TeV. The b quark production cross section for
|y(b)|<1.0 and p_T(b)>6 GeV/c is extracted from single muon and dimuon data
samples. The results agree in shape with the next-to-leading order QCD
calculation of heavy flavor production but are greater than the central values
of these predictions. The angular correlations between b and bbar quarks,
measured from the azimuthal opening angle between their decay muons, also agree
in shape with the next-to-leading order QCD prediction.


title: Neutrino Oscillations at High Energy by MACRO

abstract:
  We present updated results of the measurement of upward-going muons produced
by neutrino interactions in the rock below the MACRO detector. These data
support MACRO's previously published results. They favor a neutrino oscillation
explanation of the atmospheric neutrino anomaly.


title: Moon and Sun Shadowing Observed by the MACRO Detector

abstract:
  Using over 40 million muons collected since 1989 by the MACRO detector we
have searched for a depletion of muons coming from the direction of the Moon
due to primary cosmic rays striking the Moon. We observe this Moon shadow in
the expected position with a statistical significance of more than 5 standard
deviations. We have analyzed the same data for an analogous Sun shadow, and
have found a signal with a significance of about 4 standard deviations. The Sun
shadow is displaced from the Sun's position by about 0.6 degrees North in
ecliptic coordinates. This displacement is compatible with a deflection of
primary cosmic rays due to the Interplanetary Magnetic Field in the 10-20 TeV
primary energy range which is relevant to the underground muons observed by
MACRO.


title: Classifying LEP Data with Support Vector Algorithms

abstract:
  We have studied the application of different classification algorithms in the
analysis of simulated high energy physics data. Whereas Neural Network
algorithms have become a standard tool for data analysis, the performance of
other classifiers such as Support Vector Machines has not yet been tested in
this environment. We chose two different problems to compare the performance of
a Support Vector Machine and a Neural Net trained with back-propagation:
tagging events of the type e+e- -> ccbar and the identification of muons
produced in multihadronic e+e- annihilation events.


title: Low Energy Atmospheric Neutrino Events in MACRO

abstract:
  The flux of low energy atmospheric neutrinos (E_nu ~ 4 GeV) has been studied
with the MACRO detector at Gran Sasso by detecting nu_mu interactions inside
the apparatus, and by upward-going stopping muons. The updated analysis of the
data collected until now with the complete apparatus will be presented. The
results show a deficit of the measured number of events in an uniform way over
the whole zenith angle with respect to Monte Carlo predictions. The deficit and
the angular distributions, when interpreted in terms of neutrino oscillations,
are consistent with the MACRO results on the much higher energy upward
throughgoing muons (E_nu ~ 100 GeV).


title:
Study of a Long Baseline nu_tau Appearance Neutrino Oscillation
  Experiment in the Quasi-Elastic Regime

abstract:
  We present a study for a design of a long baseline nu_mu to nu_tau appearance
experiment to probe the high sin^2(2theta) and low Delta m^2 region relevant to
explain the atmospheric neutrino anomaly. The experiment relies on a good
identification of quasi-elastic interactions, which is a clean topology that
has an important contribution in the lowest Delta m^2 part of the region
probed. The detector we studied is a fine grained liquid scintillator detector
of 15 kilotons, optimized to detect electrons from tau -> e bar(nu_e) nu_tau
decays, while rejecting backgrounds from pi^0 in nu_mu interactions and
electrons from the nu_e beam contamination. As a reference, the proposed nu_mu
neutrino beam from CERN to Gran Sasso was used.


title: Measurement of the decay phi->mu+mu-

abstract:
  The process e^+e^- ->mu^+mu^- has been studied with SND detector at VEPP-2M
e^+e^- collider in the vicinity of phi(1020) resonance. The product of
branching ratios of phi meson into leptons \sqrt{B(phi->mu^+mu^-) B(phi->
e^+e^-)}=(3.14+-0.22+-0.14)x10^{-4} was measured from the interference in the
cross section of the process e^+e^- ->mu^+mu^-. The branching ratio
B(phi->mu^+mu^-)=(3.30+-0.45+-0.32)x10^{-4} was obtained.


title:
Search for Steady, Modulated, and Variable Cosmic Ray Sources Using
  Underground Muons in MACRO

abstract:
  Using a sample of 38.5 million underground muons collected by the MACRO
detector we have performed an all-sky search for pointlike sources producing
excesses of muons above the expected background. The d.c. muon flux upper limit
at the Earth coming from selected sources is of the order of 10^-13 cm^-2 s^-1
or less. Futhermore we discuss searches for possible modulated and variable
sources of muons using different techniques.


title:
Measurement of High-Q^2 Neutral-Current e^+p Deep Inelastic Scattering
  Cross-Sections at HERA

abstract:
  The e^+p neutral-current deep inelastic scattering differential
cross-sections $d\sigma/dQ^2$, for Q^2 > 400 GeV^2, $d\sigma/dx$ and
$d\sigma/dy$, for Q^2 > 400, 2500 and 10000 GeV^2, have been measured with the
ZEUS detector at HERA. The data sample of 47.7 pb^-1 was collected at a
center-of-mass energy of 300 GeV. The cross-section, $d\sigma/dQ^2$, falls by
six orders of magnitude between Q^2 = 400 and 40000 GeV^2. The predictions of
the Standard Model are in very good agreement with the data. Complementing the
observations of time-like Z^0 contributions to fermion-antifermion
annihilation, the data provide direct evidence for the presence of Z^0 exchange
in the space-like region explored by deep inelastic scattering.


title: Heavy Flavours in Photoproduction at HERA

abstract:
  Differential cross sections, $d\sigma/d x_\gamma^{\rm OBS}$, for dijet
photoproduction events with a tagged $D^*$ meson are presented, where
$x_\gamma^{\rm OBS}$ is the fraction of the photon energy contributing to the
two highest transverse energy jets. Results on open beauty cross sections (from
semileptonic decays) compared to LO Monte Carlo predictions are also presented.


title: The RHIC Spin Program: Snapshots of Progress

abstract:
  I review progress toward the experimental study of polarized proton
collisions at RHIC, at center-of-mass energies of several hundred GeV. The
tools under development for these experiments are summarized, with emphasis on
the complementarity for the spin program of the two major detectors, PHENIX and
STAR. The proposed research program includes measurements of the spin structure
of hadrons, tests of QCD predictions for spin observables, and polarization
searches for interactions beyond the Standard Model. I argue, in particular,
that RHIC should provide the best determination of the gluonic contribution to
proton spin foreseen for the coming decade.


title: Review on new Neutrino Oscillation Experiments

abstract:
  Driven by new experimental results, in the latest period several new neutrino
oscillation experiments have been proposed. I will outline the main ideas
behind the different proposals, in particular concerning atmospheric neutrinos
and neutrinos from accelerated beams.


title:
The Observation of a Shadow of the Moon in the Underground muon flux in
  the Soudan 2 detector

abstract:
  A shadow of the moon, with a statistical significance of 5 sigma, has been
observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2
detector. The angular resolution of the detector is well described by a
Gaussian with a sigma of less than 0.3 degrees. The position of the shadow
confirms that the alignment of the detector is known to better than 0.15
degrees and has remained stable during ten years of data taking.


title: A method to estimate primary composition with the Auger Observatory

abstract:
  We explore the feasibility of estimating primary cosmic ray composition at
ultra high energies from the sum of muon, electron and photon densities and the
depth of maximum of extensive air showers detected by the Auger Observatory.
  From the information of the Fluorescence ($X_{max}$) and water Cerenkov
detectors ($\rho(1000)$) we infere the most probable type of primary which
originated the shower. The method is tested simulating Extensive Air Showers
(EAS) at energies up to $10^{20}$ eV using a version of MOCCA/Sibyll adapted
for Dec Alpha Servers. We also discuss some results on the mass composition
using the depth of the shower maximum and the lateral distribution of showers
in the energy range $10^{18}$-$10^{20}$ eV.


title:
Measurement of $xF_3$ and $F_2$ Structure Functions in Low $Q^2$ Region
  with the IHEP-JINR Neutrino Detector

abstract:
  The isoscalar structure functions $xF_3$ and $F_2$ are measured as functions
of $x$ averaged over all $Q^2$ permissible for the range of 6 to 28 GeV of
incident neutrino (anti-neutrino) energy at the IHEP-JINR Neutrino Detector.
The QCD analysis of $xF_3$ structure function provides
$\Lambda_{\bar{MS}}^{(4)} = (411 \pm 200)$ MeV under the assumption of QCD
validity in the region of low $Q^2$. The corresponding value of the strong
interaction constant $\alpha_S (M_Z) = 0.123^{+0.010}_{-0.013}$ agrees with the
recent result of the CCFR collaboration and with the combined LEP/SLC result.


title:
Search for Contact Interactions in Deep Inelastic e^+p->e^+X Scattering
  at HERA

abstract:
  In a search for signatures of physics processes beyond the Standard Model,
various eeqq vector contact-interaction hypotheses have been tested using the
high-Q^2, deep inelastic neutral-current e^+p scattering data collected with
the ZEUS detector at HERA. The data correspond to an integrated luminosity of
47.7pb-1 of e^+p interactions at 300GeV center-of-mass energy. No significant
evidence of a contact-interaction signal has been found. Limits at the 95%
confidence level are set on the contact-interaction amplitudes. The effective
mass scales Lambda corresponding to these limits range from 1.7TeV to 5TeV for
the contact-interaction scenarios considered.


title: Measurements of $Z^0$ to Heavy-quark couplings at SLD

abstract:
  We present measurements of $Z^0$ to heavy-quark coupling electroweak
parameters, $R_b$, $R_c$, and parity-violation parameter $A_c$, from SLD. The
measurements are based on approximately 550k hadronic $Z^0$ events collected in
1993-98. Obtained preliminary results of $R_b$ and $R_c$ measurements are $R_b
= 0.2159 \pm 0.0014 \pm 0.0014$ and $R_c = 0.1685 \pm 0.0047 \pm 0.0043$. In
the $A_c$ measurement, we use four methods to determine the initial-quark
charge: combined Kaon charge and Vertex charge, lepton, exclusively
reconstructed D*, D-mesons, and a new method using inclusive soft-pion from D*.
The preliminary results of these four methods were combined to give $A_c =
0.634 \pm 0.027$.


title: Cosmic muon tomography of pure cesium iodide calorimeter crystals

abstract:
  Scintillation properties of pure CsI crystals used in the shower calorimeter
being built for precise determination of the pi+ -> pi0 e+ nu decay rate are
reported. Seventy-four individual crystals, polished and wrapped in Teflon
foil, were examined in a multiwire drift chamber system specially designed for
transmission cosmic muon tomography. Critical elements of the apparatus and
reconstruction algorithms enabling measurement of spatial detector optical
nonuniformities are described. Results are compared with a Monte Carlo
simulation of the light response of an ideal detector. The deduced optical
nonuniformity contributions to the FWHM energy resolution of the PIBETA CsI
calorimeter for the pi+ -> e+ nu 69.8 MeV positrons and the monoenergetic 70.8
MeV photons were 2.7% and 3.7%, respectively. The upper limit of optical
nonuniformity correction to the 69.8 MeV positron low-energy tail between 5 MeV
and 55 MeV was +0.2%, as opposed to the +0.3% tail contribution for the photon
of the equivalent total energy. Imposing the 5 MeV calorimeter veto cut to
suppress the electromagnetic losses, GEANT-evaluated positron and photon
lineshape tail fractions summed over all above-threshold ADCs were found to be
2.36+-0.05(stat)+-0.20(sys)% and 4.68+-0.07(stat)+-0.20(sys)%, respectively.


title: The Luminescent Bolometer As a Dark Matter Detector

abstract:
  Direct detection of WIMP dark matter candidates has to face many difficult
challenges. In particular, it requires an extremely high level of background
rejection. The only way out seems to be particle identification which, for
experiments based on nucleus recoil, is most efficiently performed by
simultaneously detecting ionization or light and phonons. When comparing
different approaches, it is necessary to keep in mind the potential requirement
of building large detectors and the difficulties that this condition may raise
for some cryogenic devices. It is claimed that the luminescent bolometer
(simultaneous detection of light and phonons) red by arrays of superconducting
tunnel junctions, as proposed by the author some years ago, ultimately provides
the most appropriate WIMP detector. Solar neutrino detection and other
applications are also briefly discussed.


title: Cosmic Ray Sun Shadow in Soudan 2 Underground Muon Flux

abstract:
  The absorption of cosmic rays by the sun produces a shadow at the earth. The
angular offset and broadening of the shadow are determined by the magnitude and
structure of the interplanetary magnetic field (IPMF) in the inner solar
system. We report the first measurement of the solar cosmic ray shadow by
detection of deep underground muon flux in observations made during the entire
ten-year interval 1989 to 1998. The sun shadow varies significantly during this
time, with a $3.3\sigma$ shadow observed during the years 1995 to 1998.


title: Observation of the Moon Shadow in Deep Underground Muon Flux

abstract:
  A shadow of the moon, with a statistical significance of $5\sigma$, has been
observed in the underground muon flux at a depth of 2090 mwe using the Soudan 2
detector. The angular resolution of the detector is well described by a
Gaussian with $\sigma \le 0.3^{\circ}$. The position of the shadow confirms the
alignment of the detector to better than $0.15^{\circ}$. This alignment has
remained stable during 10 years of data taking from 1989 through 1998.


title: Cygnus X-3 Revisited: 10 Years of Muon and Radio Observations

abstract:
  The Soudan 2 deep underground tracking calorimeter has recorded cosmic ray
muon tracks from the direction of the galactic x-ray binary Cygnus X-3 on most
transits during the interval 1989-1998. We analyze these events in the context
of previous reports of Cygnus X-3-related muon flux during major radio flares
of that source. We find some evidence for excess flux during a small number of
transits coincident with major radio flares. We also find an indication that
these events may be distributed around the source with a Gaussian point spread
function with $\sigma = 1.3^{\circ}$, larger than the instrumental angular
spread of $\le 0.3^{\circ}$, verified by observation of the shadow of the moon.


title: Measurement of Dijet Photoproduction at High Transverse Energies at HERA

abstract:
  The cross section for dijet photoproduction at high transverse energies is
presented as a function of the transverse energies and the pseudorapidities of
the jets. The measurement is performed using a sample of ep-interactions
corresponding to an integrated luminosity of 6.3 pb^(-1), recorded by the ZEUS
detector.Jets are defined by applying a k_T-clustering algorithm to the hadrons
observed in the final state. The measured cross sections are compared to
next-to-leading order QCD calculations. In a kinematic regime where theoretical
uncertainties are expected to be small, the measured cross sections are higher
than these calculations.


title:
Measurement of the Neutron Flux Produced by Cosmic-Ray Muons with LVD at
  Gran Sasso

abstract:
  The flux of muon-produced neutrons far away from the muon track may
constitute a background for the underground detectors searching for rare
events. The muon events collected by the first LVD tower from March, 1996, to
February, 1998, (1.56 years of live time) were used to estimate the neutron
flux at various distances from the muon track or muon-produced cascade.


title: Muon Astronomy with LVD Detector

abstract:
  We analysed the arrival directions of single muons detected by the first LVD
tower from November, 1994 till January, 1998. The moon shadowing effect has
been observed. To search for point sources of high energy photons we have
analysed muons crossing the rock thickness greater than 3, 5 and 7 km w.e.,
which corresponds to the mean muon energies 1.6, 3.9 and 8.4 TeV at the
surface, respectively. Upper limits on steady muon fluxes for selected
astrophysical sources for different muon energies are presented.


title: Deep-Inelastic e^+p Scattering at Very High Q^2 from ZEUS at HERA

abstract:
  Neutral-current and charged-current deep-inelastic scattering at very high
four-momentum transfer squared (Q^2) have been studied in positron-proton
collisions at center-of-mass energy 300 GeV using the ZEUS detector at HERA. An
integrated luminosity of 47.7 $pb^{-1}$ was collected in the years 1994-1997.
Differential cross sections are presented for $Q^2 > 400 GeV^2$ and compared to
Standard Model predictions.


title:
Angular and Current-Target Correlations in Deep Inelastic Scattering at
  HERA

abstract:
  Correlations between charged particles in deep inelastic ep scattering have
been studied in the Breit frame with the ZEUS detector at HERA using an
integrated luminosity of 6.4 pb-1. Short-range correlations are analysed in
terms of the angular separation between current-region particles within a cone
centred around the virtual photon axis. Long-range correlations between the
current and target regions have also been measured. The data support
predictions for the scaling behaviour of the angular correlations at high Q2
and for anti-correlations between the current and target regions over a large
range in Q2 and in the Bjorken scaling variable x. Analytic QCD calculations
and Monte Carlo models correctly describe the trends of the data at high Q2,
but show quantitative discrepancies. The data show differences between the
correlations in deep inelastic scattering and e+e- annihilation.


title: Semi-leptonic Decays of Heavy Quarks in Dijet Photoproduction at HERA

abstract:
  The production of heavy quarks has been studied in photoproduction processes
with the ZEUS detector at HERA using an integrated luminosity of $36.9
pb^{-1}$. Events with a photon virtuality, $Q^2<1 GeV^2$, were selected with
two jets of high transverse energy and an electron in the final state.
Consideration of the distribution in $p_T^{rel}$ - the momentum of the electron
transverse to the axis of the jet to which the electron is closest - allows a
measurement of the beauty cross-section in a restricted region of phase space.


title:
Nuclear Structure Functions in the Large x Large Q^2 Kinematic Region in
  Neutrino Deep Inelastic Scattering

abstract:
  Data from the CCFR E770 Neutrino Deep Inelastic Scattering (DIS) experiment
at Fermilab contain events with large Bjorken x (x>0.7) and high momentum
transfer (Q^2>50 (GeV/c)^2). A comparison of the data with a model based on no
nuclear effects at large x, shows a significant excess of events in the data.
Addition of Fermi gas motion of the nucleons in the nucleus to the model does
not explain the excess. Adding a higher momentum tail due to the formation of
``quasi-deuterons'' makes some improvement. An exponentially falling F_2
\propto e^-s(x-x_0) at large x, predicted by ``multi-quark clusters'' and
``few-nucleon correlations'', can describe the data. A value of s=8.3 \pm
0.7(stat.)\pm 0.7(sys.) yields the best agreement with the data.


title:
Polarized lepton nucleon scattering - summary of the experimental spin
  sessions at DIS 99

abstract:
  This paper summarizes the contributions to the experimental sessions on
polarized lepton nucleon scattering at the DIS 99 workshop. Results are
reported about the flavor decomposition of the quark polarization, a first
direct measurement of a positive gluon polarization, the observation of a
double-spin asymmetry in diffractive rho production, the polarization of lambda
hyperons, the observation of transverse single-spin asymmetries and the
measurement of the Gerasimov-Drell-Hearn sum rule. Prospects of future fixed
target and collider facilities are discussed.


title:
An Improved Measurement of the b Quark Fragmentation Function in Z0
  Decays

abstract:
  We present a new preliminary measurement of the b quark fragmentation
function in Z0 decays using a novel kinematic B hadron energy reconstruction
technique. The measurement is performed using 150,000 hadronic Z0 events
recorded in the SLD experiment at SLAC between 1996 and 1997. The small and
stable SLC beam spot and the CCD-based vertex detector are used to reconstruct
topological B-decay vertices with high efficiency and purity, and to provide
precise measurements of the kinematic quantities used in this technique. We
measure the B energy with good efficiency and resolution over the full
kinematic range. We compare the scaled B hadron energy distribution with
several functional forms of the B hadron energy distribution and models of b
quark fragmentation. Several functions including JETSET + Peterson are excluded
by the data. The average scaled energy of the weakly decaying B hadron is
measured to be XB = 0.719 +/- 0.005 (stat) +/- 0.007 (syst) +/- 0.001 (model)
(preliminary).