title: Recent Results on Charm and Hyperon Physics from SELEX

abstract:
  The SELEX experiment (Fermilab E781) is a 3-stage magnetic spectrometer for
the study of charm hadroproduction at large x_F using 600GeV/c Sigma-, pi-, and
p beams. New precise measurements of the Lambda_c, D0, and Ds lifetimes are
presented. Results on Lambda_c and D_s production for x_F>0.2 are reported as
well. The spectrometer was also used for hyperon physics, where we will show
measurements of the Sigma- charge radius, the polarization of inclusive
produced Lambda's, and the polarization of beam Sigma+.


title: First Physics Results at BABAR

abstract:
  The BABAR detector, which operates at the SLAC PEP-II asymmetric e^+e^-
collider at energies near the Y(4S) resonance, started operation on the 26th of
May 1999. We present the first study of sin2beta, with samples of B0 --> J/psi
K0S and B0 --> psi(2S) K0S decays, using 9.0 fb-1 of data recorded between
January and July 2000 at the Y(4S) resonance and 0.8 fb-1 recorded 40 MeV below
the Y(4S) resonance. A preliminary result of sin2beta = 0.12+/-0.37 (stat) +/-
0.09 (syst) was obtained. Details of the analysis are given. Moreover, we
present measurements of charged and neutral B meson lifetimes and B^0 B^0bar
oscillation frequency.


title: CP Violation and Mixing Results from FNAL E791

abstract:
  We review results from FNAL E791 concerning D0-D0bar mixing and CP violation
in D meson decays. We have searched for mixing in semileptonic D0 ->
K+\ell-\bar{\nu} decays and in hadronic D0 -> K+\pi- and D0 -> K+\pi-\pi+\pi-
decays. We have searched for CP violation in D0 -> K+K- / \pi+\pi- and D+ ->
\phi\pi+ / \bar{K}^{*0}K+ / K+K-\pi+ / \pi+\pi-\pi+ decays. Finally, we have
measured the difference in decay widths \Delta\Gamma between the two
mass-eigenstates of the D0-D0bar system. This parameter affects the rate of
D0-D0bar mixing. We combine our results with those from other experiments to
obtain confidence intervals incorporating all published experimental data.


title: Search for R-parity Violating Decays of Supersymmetric Particles at LEP

abstract:
  Searches for pair-produced charginos, neutralinos and scalar fermions
decaying via R-parity violating / /\' and /\'' couplings with the OPAL detector
at LEP are presented at sqrt(s)=189 GeV. Partial updates using data up to the
highest energies of LEP, sqrt(s)=209 GeV, are also given.


title: Study of ZZ production at LEP at sqrt(s) = 183 - 209 GeV

abstract:
  A study of Z boson pair production in e+e- annihilation using the OPAL
detector at LEP is reported. The ZZ production cross-section is measured,
limits on anomalous ZZgamma and ZZZ couplings are derived, and constraints on
models of low scale quantum gravity in extra spatial dimensions are set.


title: Light mesons and charm decays: New results from E791

abstract:
  We will discuss how the decays of charm mesons can be used to study light
mesons spectroscopy, by presenting recent results of Dalitz plot analyses using
data from Fermilab experiment E791. Emphasis will be on scalar mesons, which
are found to have large contribution to the $D$ decays studied. In addition to
the usual extraction of decay fractions and relative phases of the intermediate
amplitudes, the Dalitz plot technique is used to measure masses and widths of
scalar resonances. From the $D_s$ decay, we obtain masses and widths of
$f_0(980)$ and $f_0(1370)$. We find evidence for a light and broad scalar
resonance, the $\sigma$ meson, in $D^+\to\pi^-\pi^+\pi^+$ decay. Preliminary
studies also show evidence for a light and broad resonance, the $\kappa$ meson,
in $D^+\to K^-\pi^+\pi^+$ decay. These results illustrate the potential of
charm decays as a laboratory for the study of light mesons.


title: Review of experimental results on neutral B meson oscillations

abstract:
  The current status of the experimental knowledge of neutral B meson
oscillation is reviewed. The B0d oscillation frequency is precisely measured by
SLD, CDF and the LEP experiments. An overview of the analyses and their
combination is presented. Preliminary measurements and perspectives at the
running B factories are also briefly discussed. The much faster B0s
oscillations have not yet been resolved, despite the progress recently by SLD
and ALEPH. The world combination is presented, together with the expected and
observed lower limit on the B0s oscillation frequency. The "amplitude method",
used to combine the analyses in order to set the limits, is discussed also as a
tool to establish the significance of a possible signal.


title: Performances of the NA48 Liquid Krypton calorimeter

abstract:
  The NA48 experiments aims at a precise measurement of direct CP violation in
the neutral Kaon system. This puts stringent requirements on the
electromagnetic calorimeter used to detect photons of average energy 25 GeV.
The choice of NA48 is a quasi homogeneous Liquid Krypton calorimeter with fast
readout. The operation of this device and the performances achieved are
described.


title: New Results on Rare and Forbidden Semileptonic $K^+$ Decays

abstract:
  Experiment E865 at the Brookhaven AGS was set up primarily to search for the
lepton flavour violating decay $K^+\to \pi^+\mu^+e^-$ ($K_{\pi\mu e}$) with
high sensitivity. The flexibility of the apparatus allowed also to obtain more
than an order of magnitude larger than previously available event samples on
the following decay modes: $ \pi^+e^+e^- (K_{\pi ee})$, $\pi^+\mu^+\mu^-
(K_{\pi\mu\mu})$, $\pi^+\pi^-e^+\nu_e (K_{e4})$, $\mu^+e^+e^-\nu_\mu$, and
$e^+e^+e^-\nu_e$. The report focusses on the $K_{\pi\mu e}$ results and those
on other lepton flavour violating decays as well as the $K_{e4}$ data, from
which a new, quite precise value for the s-wave $\pi\pi$ scattering length can
be deduced.


title:
Measurement of the Two-Jet Differential Cross Section in
  proton-antiproton Collisions at sqrt{s} = 1800 GeV

abstract:
  A measurement is presented of the two-jet differential cross section,
d^3\sigma/dE_T d\eta_1 d\eta_2, at center of mass energy sqrt{s} = 1800 GeV in
proton-antiproton collisions. The results are based on an integrated luminosity
of 86 pb^-1 collected during 1994-1995 by the CDF collaboration at the Fermilab
Tevatron collider. The differential cross section is measured as a function of
the transverse energy, E_T, of a jet in the pseudorapidity region 0.1 < |eta_1|
< 0.7 for four different pseudorapidity bins of a second jet restricted to 0.1
< |\eta_2| < 3.0. The results are compared with next-to-leading order QCD
calculations determined using the CTEQ4 and MRST sets of parton distribution
functions. None of the sets examined in this analysis provides a good
description of the data.


title: Electrooptical Detection of Charged Particle Beams

abstract:
  We have made the first observation of a charged particle beam by means of its
electro-optical effect on the propagation of laser light in a birefringent
crystal at the Brookhaven National Laboratory Accelerator Test Facility.
Polarized infrared light was coupled to a LiNbO3 crystal through a polarization
maintaining fiber of 4 micron diameter. An electron beam in 10ps bunches of 1mm
diameter was scanned across the crystal. The modulation of the laser light
during passage of the electron beam was observed using a photodiode with 45GHz
bandwidth. The fastest rise time measured, 120ps, was made in the single shot
mode and was limited by the bandwidth of the oscilloscope and the associated
electronics. Both polarization dependent and polarization independent effects
were observed. This technology holds promise of greatly improved spatial and
temporal resolution of charged particle beams.


title: FunctionalObjects.h: Using Symbolic Syntax in C++ Programs

abstract:
  functionalObjects.h allows the C++ programmer performing common mathematical
calculations to use a more symbolic syntax rather than an algorithmic syntax.
This is not as ambitious as a symbolic manipulation program such as
Mathematica; it is more like having the ability to drop a very simple
Mathematica statement into a C++ program.


title: Semi-Contained Neutrino Events in MACRO

abstract:
  Updated results are presented of low-energy ($\bar{E_\nu} \sim 5 GeV$)
neutrino interactions observed by the MACRO detector. Two analyses (of
different topologies) are presented; individually, and especially in their
ratio, they are inconsistent with no oscillations and consistent with maximal
mixing at $\Delta m^2$ of a few times $10^{-3}$.


title:
Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard
  Model in e+e- Interactions at root(s)=192-202GeV

abstract:
  A search for the lightest neutral CP-even and the neutral CP-odd Higgs bosons
of the Minimal Supersymmetric Standard Model is performed using 233.2 pb-1 of
integrated luminosity collected with the L3 detector at LEP at centre-of-mass
energies 192-202 GeV. No signal is observed and lower mass limits are given as
a function of tan(beta) for two scalar top mixing hypotheses. For tan(beta)
greater than 0.8, they are mh > 83.4 GeV and mA > 83.8 GeV at 95 % confidence
level.


title: Precise Determination of the Z Resonance Parameters at LEP : Zedometry

abstract:
  This final analysis of hadronic and leptonic cross-sections and of leptonic
forward-backward asymmetries in e+e- collisions with the OPAL detector makes
use of the full LEP1 data sample comprising 161 pb^-1 of integrated luminosity
and 4.5 x 10^6 selected Z decays. An interpretation of the data in terms of
contributions from pure Z exchange and from Z-gamma interference allows the
parameters of the Z resonance to be determined in a model-independent way. Our
results are in good agreement with lepton universality and consistent with the
vector and axial-vector couplings predicted in the Standard Model. A fit to the
complete dataset yields the fundamental Z resonance parameters: mZ = 91.1852 +-
0.0030 GeV, GZ = 2.4948 +- 0.0041 GeV, s0h = 41.501 +- 0.055 nb, Rl = 20.823 +-
0.044, and Afb0l = 0.0145 +- 0.0017. Transforming these parameters gives a
measurement of the ratio between the decay width into invisible particles and
the width to a single species of charged lepton, Ginv/Gl = 5.942 +- 0.027.
Attributing the entire invisible width to neutrino decays and assuming the
Standard Model couplings for neutrinos, this translates into a measurement of
the effective number of light neutrino species, N_nu = 2.984 +- 0.013.
Interpreting the data within the context of the Standard Model allows the mass
of the top quark, mt = 162 +29-16 GeV, to be determined through its influence
on radiative corrections. Alternatively, utilising the direct external
measurement of mt as an additional constraint leads to a measurement of the
strong coupling constant and the mass of the Higgs boson: alfa_s(mZ) = 0.127 +-
0.005 and mH = 390 +750-280 GeV.


title:
Search for the Standard Model Higgs boson in e+e- collisions at root(s)
  up to 202GeV

abstract:
  The Standard Model Higgs boson is searched for in 233.2 pb-1 of data
collected by the L3 detector at centre of mass energies from 192 GeV to 202
GeV. These data are consistent with the expectations of Standard Model
processes and no evidence of a Higgs signal is observed. A lower limit on the
mass of the Standard Model Higgs boson of 107.0 GeV is set at the 95%
confidence level.


title: Evidence of New States Decaying into $\Xi^{\prime}_{c}\pi$

abstract:
  Using 13.7 $fb^{-1}$ of data recorded by the CLEO detector at CESR, we report
evidence for two new charmed baryons: one decaying into $\Xi_c^{0 \prime}\pi^+$
with the subsequent decay $\Xi_c^{0 \prime} \to \Xi_c^0 \gamma$, and its
isospin partner decaying into $\Xi_c^{+ \prime} \pi^-$ followed by
$\Xi_c^{+\prime} \to \Xi_c^+\gamma$. We measure the following mass differences
for the two states: $M(\Xi_c^0 \gamma \pi^+)-M(\Xi_c^0)$=318.2+-1.3+-2.9 MeV,
and $M(\Xi_c^+ \gamma \pi^-)-M(\Xi_c^+)$=324.0+-1.3+-3.0 MeV. We interpret
these new states as the $J^P = 1/2^- \Xi_{c1}$ particles, the charmed-strange
analogs of the $\Lambda_{c1}^+(2593)$.


title:
Physics Case and Challenges for the Vertex Tracker at Future High Energy
  e+e- Linear Colliders

abstract:
  The physics programme of high energy e+e- linear colliders relies on the
accurate identification of fermions in order to study in details the profile of
the Higgs boson, search for new particles and probe the multi-TeV mass region
by means of precise electro-weak measurements and direct searches.


title: GENIUS-TF: a test facility for the GENIUS project

abstract:
  GENIUS is a proposal for a large scale detector of rare events. As a first
step of the experiment, a small test version, the GENIUS test facility, will be
build up at the Laboratorio Nazionale del Gran Sasso (LNGS). With about 40 kg
of natural Ge detectors operated in liquid nitrogen, GENIUS-TF could exclude
(or directly confirm) the DAMA annual modulation signature within about two
years of measurement.


title: Multijet Final States in e+e- Annihilation

abstract:
  We review the current status of analyses of multijet final states in e+e-
annihilation. Results for jet observables from LEP 1, LEP 2 and from the
reanalysis of the PETRA experiment JADE will be presented. A determination of
the b-quark mass using jet observables will be discussed and tests of power
correction models will be shown. Finally determinations of the QCD colour
factors from an analysis of event shape distributions at several energy points
using power corrections will be discussed.


title: Electrooptical Detection of Charged Particles

abstract:
  We have made the first observation of a charged particle beam by means of its
electro-optical effect on the polarization of laser light in a LiNbO3 crystal.
The modulation of the laser light during the passage of a pulsed electron beam
was observed using a fast photodiode and a digital oscilloscope. The fastest
rise time measured, 120 ps, was obtained in the single shot mode and was
limited by the bandwidth of the oscilloscope and the associated electronics.
This technology holds promise for detectors of greatly improved spatial and
temporal resolution for single relativistic charged particles as well as
particle beams.


title: First Electrooptical Detection of Charged Particles

abstract:
  We have made the first observation of a charged particle beam by means of its
electro-optical effect on the polarization of laser light in a birefringent
crystal. The modulation of the laser light during the passage of a pulsed
electron beam was observed using a fast photodiode and a digital oscilloscope.
The fastest rise time measured in a single shot, 120 ps, was limited by the
bandwidth of the oscilloscope and the associated electronics. This technology
holds promise for detectors of greatly improved spatial and temporal resolution
for single relativistic charged particles as well as particle beams.


title: Large Standard Model Higgs at LEP

abstract:
  In 1999 the LEP experiments collected data at centre of mass energies between
192 and 202 GeV for about 900 pb-1 integrated luminosity. Combined results are
presented for the search for the Standard Model Higgs boson. No statistically
significant excess has been observed when compared to Standard Model background
expectation which can be translated into a lower bound on the mass of the Higgs
boson at 107.9 GeV/c^2 at 95 % confidence level.


title: B decays to final states including D_s^{(*)} and D^*

abstract:
  The e^+e^- annihilation data recorded with the BABAR detector has been used
to study B decays to D_s^(*) and D^* mesons. The production fraction of
inclusive D_s^(*) and the corresponding momentum spectra have been determined.
Exclusive decays B^0 --> D^{*-}D_s^{(*)+} have been identified with a partial
reconstruction technique and their branching fractions have been measured. We
also report branching fraction measurements for the exclusive hadronic modes
B^0 --> D^{*-} pi^+ and B^0 --> D^{*-} rho^+.


title: Measurement of sin2phi_1 at Belle

abstract:
  With 6.2 fb^-1 of data collected on the Upsilon(4S), Belle reports its first
measurement of sin 2\phi_1 = 0.45^{+0.43}_{-0.44}(stat)^{+0.07}_{-0.09}(sys).
The result was obtained by fitting the proper time distribution of flavor
tagged and fully reconstructed neutral B mesons decays to five different
charmonia plus a Kshort or Klong channels. In this paper the analysis and
results will be described briefly.


title:
First Measurement of the Ratio B(t-->Wb)/B(t-->Wq) and Associated Limit
  on the CKM Element Vtb

abstract:
  We present the first measurement of the ratio of branching fraction R=
B(t-->wb)/B(t-->Wq) from ppbar collisions at sqrt(s)=1.8 TeV. The data set
corresponds to 109 pb-1 of data recorded by the Collider Detector at Fermilab
during the 1992-1995 Tevatron run. We measure R=0.94+.31-.24 (stat+syst) or
R>0.61 (0.56) at 90 (95) %C.L., in agreement with the standard model
predictions. This measurement yields a limit of the Cabibbo-Kobayashi-Maskawa
quark mixing matrix element Vtb under the assumption of three generation
unitarity.


title:
Science and Technology of BOREXINO: A Real Time Detector for Low Energy
  Solar Neutrinos SOLAR NEUTRINOS

abstract:
  BOREXINO, a real-time device for low energy neutrino spectroscopy is nearing
completion of construction in the underground laboratories at Gran Sasso, Italy
(LNGS). The experiment's goal is the direct measurement of the flux of 7Be
solar neutrinos of all flavors via neutrino-electron scattering in an
ultra-pure scintillation liquid. Seeded by a series of innovations which were
brought to fruition by large scale operation of a 4-ton test detector at LNGS,
a new technology has been developed for BOREXINO. It enables sub-MeV solar
neutrino spectroscopy for the first time. This paper describes the design of
BOREXINO, the various facilities essential to its operation, its spectroscopic
and background suppression capabilities and a prognosis of the impact of its
results towards resolving the solar neutrino problem. BOREXINO will also
address several other frontier questions in particle physics, astrophysics and
geophysics.


title:
A Measurement of the Branching Ratio and Asymmetry of the Decay
  Cascade^0-->Sigma^0/gamma

abstract:
  We have studied the rare weak radiative hyperon decay Cascade0-->Sigma0/gamma
in the KTeV experiment at Fermilab. We have identified 4045 signal events over
a background of 804 events. The dominant Cascade0-->Lambda/pi0 decay, which was
used for normalization, is the only important background source. An analysis of
the acceptance of both modes yields a branching ratio of
BR(Cascade0-->Sigma0/gamma)=(3.34 +/- 0.05 +/- 0.09) x 10^(-3). By analyzing
the final state decay distributions, we have also determined that the Sigma0
emission asymmetry parameter for this decay is alpha = -0.63 +/- 0.09.


title: Electrooptical Measurements of Ultrashort 45 MeV Electron Beam Bunches

abstract:
  We have measured the temporal duration of 45 MeV picosecond electron beam
bunches using a noninvasive electro-optical (EO) technique. The amplitude of
the EO modulation was found to increase linearly with electron beam charge and
decrease inversely with distance from the electron beam. The risetime of the
temporal signal was limited by our detection system to ~70ps. The EO signal due
to ionization caused by the electrons traversing the EO crystal was also
observed. It has a distinctively long decay time constant and signal polarity
opposite to that due to the field induced by the electron beam. The
electro-optical technique may be ideal for the measurement of bunch length of
femtosecond, relativistic, high energy, charged, particle beams.


title:
Measurement of the cross-section and forward-backward charge asymmetry
  for the b and c-quark in e+e- annihilation with inclusive muons at sqrt(s) =
  58 GeV

abstract:
  We have studied inclusive muon events using all the data collected by the
TOPAZ detector at sqrt(s)=58 GeV with an integrated luminosity of 273pb-1. From
1328 inclusive muon events, we measured the ratio R_qq of the cross section for
qq-bar production to the total hadronic cross section and forward-backward
asymmetry A^q_FB for b and c quarks. The obtained results are R_bb =
0.13+-0.02(stat)+-0.01(syst), R_cc = 0.36+-0.05(stat)+-0.05(syst), A^b_FB =
-0.20+-0.16(stat)+-0.01(syst) and A^c_FB = -0.17+-0.14(stat)+-0.02(syst), in
fair agreement with a prediction of the standard model.


title:
Angular distribution of $J/\psi$ decays in dimuon channel in 800 GeV
  proton-copper collisions

abstract:
  The anuglar distribution of $J/\psi$ decays in the $\mu^{+}\mu^{-}$ channel
in 800 proton-copper collisions has been measured for $x_F$ > 0.25. The
polarization parameter $\lambda$ is extracted in 1 GeV of $p_T$ and 0.1 of
$x_F$ bins for two magnet configugrations with different acceptances. The data
indicate that the $J/\psi$'s are produced with a slight transverse polarization
at small $x_F$, which turns to longitudinal at $x_F$ > 0.6. No $p_T$ dependence
of $\lambda$ is observed. Theoretical calculations are needed in order to
interpret the measurements.


title: Observation of Tau Neutrino Interactions

abstract:
  The DONUT experiment has analyzed 203 neutrino interactions recorded in
nuclear emulsion targets. A decay search has found evidence of four tau
neutrino interactions with an estimated background of 0.34 events. This number
is consistent with the Standard Model expectation.


title:
Moments of the charged-particle multiplicity distribution in Z decays at
  LEP

abstract:
  The charged-particle multiplicity distribution and its moments have been
measured, for all hadronic as well as for light-quark and b-quark events in
e+e- collisions at the Z mass. The Hq moments derived from the charged-particle
multiplicity distribution are known to exhibit quasi-oscillations when plotted
versus the order of the moment. This behavior is predicted by the NNLLA of
perturbative QCD for the parton level and, under the assumption of LPHD, also
for the hadron level. Using the jet multiplicity distributions in order to vary
the dependence on the LPHD hypothesis, we find, however, that at our energy the
oscillations only appear for non-perturbative scales. In the absence of
confirmation of pQCD, we investigate a more phenomenological answer in the
possibility that the features seen in the Hq behavior could be due to the fact
that the charged-particle multiplicity derives from a superposition of final
states related to the topology of the events. Therefore, the analysis is
repeated using charged-particle multiplicity distributions originating from
2-jet and 3-jet events for the full, light- and b-quark samples.


title: The BABAR measurement of sin2beta and its future prospects

abstract:
  The measurement of sin2beta by the BABAR experiment, where beta is one of the
angles of the Unitarity Triangle, is described. Some prospects for the future
of the measurement are also discussed.


title: New R values in 2-5 GeV from the BESII at BEPC

abstract:
  We report preliminary $R$ values for all 85 energy points scanned in the
energy region of 2-5 GeV with the upgraded Beijing Spectrometer (BESII) at the
Beijing Electron Positron Collider (BEPC). The typical uncertainty on the R
values we measured is about 7%. The new R values have a significant impact on
the predicted mass of the Higgs coming from the global fit to the electroweak
data, and will also contribute to the interpretation of the E821 g-2
experiment.


title:
Study of conversion decays phi->etae+e-, eta->e+e-g and eta->pi+pi-e+e-
  at CMD-2

abstract:
  Using 15.1 pb^{-1} of data collected by CMD-2 in the phi-meson energy range,
the branching ratios of the following conversion decays have been measured:
B(\phi\to\eta e^+e^-) = (1.14\pm0.10\pm0.06)\cdot10^{-4}, B(\eta\to
e^+e^-\gamma) = (7.10\pm0.64\pm0.46)\cdot10^{-3}, B(\eta\to\pi^+\pi^-e^+e^-) =
(3.7^{+2.5}_{-1.8}\pm0.3)\cdot10^{-4}. The upper limits for the following rare
conversion decays have been obtained at the 90% confidence level:
B(\phi\to\eta\mu^+\mu^-) < 9.4\cdot10^{-6}, B(\eta\to e^+e^-e^+e^-) <
6.9\cdot10^{-5}.


title: Optimization of drift gases for accuracy in pressurized drift tubes

abstract:
  Modern detectors such as ATLAS use pressurized drift tubes to minimize
diffusion and achieve high coordinate accuracy. However, the coordinate
accuracy depends on the exact knowledge of converting measured times into
coordinates. Linear space-time relationships are best for reconstruction, but
difficult to achieve in the $E \propto \frac{1}{r}$ field. Previous mixtures,
which contained methane or other organic quenchers, are disfavored because of
ageing problems. From our studies of nitrogen and carbon dioxide, two mixtures
with only small deviations from linearity were determined and measured. Scaling
laws for different pressures and magnetic fields are also given.


title: Heavy Quark Production at HERA

abstract:
  Recent results on heavy flavor production at HERA are presented. New
measurements of charm production are available in the region of $ Q^2 <$ 1000
GeV$^2$ for $D^*$ and in the photoproduction limit, $Q^2\to 0$, for $D_s$. The
results are compared to theoretical calculations and the charm proton structure
function \f2cc$(x,Q^2)$ is extracted. A new independent measurement of the
$b\bar{b}$ cross section using a $b$-lifetime tag is reported.


title: The first year of the BABAR experiment at PEP-II

abstract:
  The BABAR detector, situated at the SLAC PEP-II asymmetric e^+e^- collider,
has been recording data at energies on and around the Upsilon(4S) resonance
since May 1999. In this paper, we briefly describe the PEP-II B Factory and the
BABAR detector. The performance presently achieved by the experiment in the
areas of tracking, vertexing, calorimetry and particle identification is
reviewed. Analysis concepts that are used in the various papers submitted to
this conference are also discussed.


title:
Time Dependent B0s - B0s-bar Mixing Using Inclusive and Semileptonic B
  Decays at SLD

abstract:
  We set a preliminary 95% C.L. exclusion on the oscillation frequency of B0s -
B0s-bar mixing using a sample of 400,000 hadronic Z0 decays collected by the
SLD experiment at the SLC between 1996 and 1998. The analyses determine the
b-hadron flavor at production by exploiting the large forward-backward
asymmetry of polarized Z0 -> b b-bar decays as well as information from the
hemisphere opposite that of the reconstructed B decay. In one analysis, B decay
vertices are reconstructed inclusively with a topological technique,and
separation between B0s and B0s-bar decays exploits the B0s -> Ds- cascade
charge structure. In the other analysis, semileptonic decays are selected and
the B decay point is reconstructed by intersecting a lepton track with the
trajectory of a topologically reconstructed D meson. The two analyses are
combined with a third analysis described elsewhere to exclude the following
values of the B0s - B0s-bar mixing oscillation frequency: Delta m_s < 7.6 ps-1
and 11.8 < Delta m_s < 14.8 ps-1 at the 95% confidence level.


title:
A Measurement of the QCD Colour Factors using Event Shape Distributions
  at sqrt(s)=14 GeV to 189 GeV

abstract:
  Measurements of the QCD colour factors C_A and C_F and of the number of
active quark flavours n_f in the process e+e- -> hadrons at high energy are
presented. They are based on fits of O(alpha_S**2)+NLLA QCD calculations to
distributions of the event shape observables 1-T, C, B_T and B_W measured at
centre-of-mass energies from 14 GeV to 189 GeV. Hadronisation effects are
approximated with power correction calculations which also depend on the QCD
gauge structure. In this approach potential biases from hadronisation models
are reduced. Our results for individually measured quantities are n_f = 5.64 +-
1.35, C_A = 2.88 +- 0.27 and C_F = 1.45 +- 0.27 in good agreement with QCD
based on the SU(3) symmetry group where n_f=5 for the energies considered here,
C_A=3 and C_F=4/3. From simultaneous fits of C_A and C_F we find C_A = 2.84 +-
0.24 and C_F = 1.29 +- 0.18, which is also in good agreement with the QCD
expectation.


title: A Biased Review of Tau Neutrino Mass Limits

abstract:
  After a quick review of astrophysically relevant limits, I present a summary
of MeV scale tau neutrino mass limits derived from accelerator based
experiments.
  I argue that the current published limits appear to be too consistent, and
that we therefore cannot conclude that the tau neutrino mass limit is as low as
usually claimed. I provide motivational arguments calling into question the
assumed statistical properties of the usual maxumum likelihood estimators, and
provide a prescription for deriving a more robust and understandable mass
limit.


title: High-p_T Jets in pbarp Collisions at sqrt{s} = 630 and 1800 GeV

abstract:
  Results are presented from analyses of jet data produced in pbarp collisions
at sqrt{s} = 630 and 1800 GeV collected with the DO detector during the 1994-95
Fermilab Tevatron Collider run. We discuss details of detector calibration, and
jet selection criteria in measurements of various jet production cross sections
at sqrt{s} = 630 and 1800 GeV. The inclusive jet cross sections, the dijet mass
spectrum, the dijet angular distributions, and the ratio of inclusive jet cross
sections at sqrt{s} = 630 and 1800 GeV are compared to next-to-leading-order
QCD predictions. The order alpha_s^3 calculations are in good agreement with
the data. We also use the data at sqrt{s} = 1800 GeV to rule out models of
quark compositeness with a contact interaction scale less than 2.2 TeV at the
95% confidence level.


title: Problems of multi-TeV photon colliders

abstract:
  A high energy photon collider (gamma-gamma, gamma-electron) based on backward
Compton scattering of laser light is a very natural supplement to e+e- a linear
collider and can significantly enrich the physics program. The region below
about one 0.5-1 TeV is very convenient from a technical point of view: wave
length of the laser should be about 1 micron, i.e. in the region of most
powerful solid state lasers, collision effects do not restrict the gamma-gamma
luminosity. In the multi-TeV energy region the situation is more complicated:
the optimum laser wave length increases in proportionally with the energy, the
required flash energy also increases due to nonlinear effects in the Compton
scattering; bunch trains are shorter (for warm high gradient linacs), this
leads to higher backgrounds; the collision effects (coherent pair e+e- pair
creation) restrict the luminosity. These problems and possible solutions are
discussed in this paper. A method of laser focusing is considered which allows
the decrease of the required laser flash energy and the practical elimination
of the problem of nonlinear effects in Compton scattering; a way to reduce
collision effects and obtain ultimate gamma-gamma luminosities at multi-TeV
photon colliders is suggested.

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


title: A Study of the Decay D0->K+pi-

abstract:
  Using a large sample of photoproduced charm mesons from the FOCUS experiment
at Fermilab (FNAL-E831), we observe the decay $D^0\to K^+\pi^-$ with a signal
yield of $149\pm31$ events compared to a similarly cut sample consisting of
$36760 \pm 195$ $D^0\to K^-\pi^+$ events. We use the observed ratio of $D^0\to
K^+\pi^-$ to $D^0\to K^-\pi^+$ $(0.404\pm 0.085\pm 0.025)%$ to obtain a
relationship between the $D^0$ mixing and doubly Cabibbo suppressed decay
parameters.


title:
Hadron Formation in Deep-Inelastic Positron Scattering in a Nuclear
  Environment

abstract:
  The influence of the nuclear medium on the production of charged hadrons in
semi-inclusive deep-inelastic scattering has been studied by the HERMES
experiment at DESY using a 27.5 GeV positron beam. The differential
multiplicity of charged hadrons and identified charged pions from nitrogen
relative to that from deuterium has been measured as a function of the virtual
photon energy \nu and the fraction z of this energy transferred to the hadron.
There are observed substantial reductions of the multiplicity ratio R_M^h at
low \nu and at high z, both of which are well described by a
gluon-bremsstrahlung model of hadronization. A significant difference of the
\nu-dependence of R_M^h is found between positive and negative hadrons. This is
interpreted in terms of a difference between the formation times of protons and
pions, using a phenomenological model to describe the \nu- and z-dependence of
R_M^h.


title: ElectroOptical measurements of ultrashort 45 MeV electron beam bunch

abstract:
  We have made an observation of 45 MeV electron beam bunches using the
nondestructive electro-optical (EO) technique. The amplitude of the EO
modulation was found to increase linearly with electron beam charge and
decrease inversely with the optical beam path distance from the electron beam.
The risetime of the signal was bandwidth limited by our detection system to
\~70ps. An EO signal due to ionization caused by the electrons traversing the
EO crystal was also observed. The EO technique may be ideal for the measurement
of bunch structure with femtosecond resolution of relativistic charged particle
beam bunches.


title: Diffractive Jet Production in Deep-Inelastic e^+p Collisions at HERA

abstract:
  A measurement is presented of dijet and 3-jet cross sections in low-|t|
diffractive deep-inelastic scattering interactions of the type ep -> eXY, where
the system X is separated by a large rapidity gap from a low-mass baryonic
system Y. Data taken with the H1 detector at HERA, corresponding to an
integrated luminosity of 18.0 pb^(-1), are used to measure hadron level single
and double differential cross sections for 4<Q^2<80 GeV^2, x_pom<0.05 and
p_(T,jet)>4 GeV. The energy flow not attributed to jets is also investigated.
The measurements are consistent with a factorising diffractive exchange with
trajectory intercept close to 1.2 and tightly constrain the dominating
diffractive gluon distribution. Viewed in terms of the diffractive scattering
of partonic fluctuations of the photon, the data require the dominance of
qqbarg over qqbar states. Soft colour neutralisation models in their present
form cannot simultaneously reproduce the shapes and the normalisations of the
differential cross sections. Models based on 2-gluon exchange are able to
reproduce the shapes of the cross sections at low x_pom values.


title:
Measurement of Neutral and Charged Current Cross Sections in
  Electron-Proton Collisions at High Q^2

abstract:
  The inclusive e^-p single and double differential cross sections for neutral
and charged current processes are measured with the H1 detector at HERA, in the
range of four-momentum transfer squared Q^2 between 150 and 30000 GeV^2, and
Bjorken x between 0.002 and 0.65. The data were taken in 1998 and 1999 with a
centre-of-mass energy of 320 GeV and correspond to an integrated luminosity of
16.4 pb^(-1). The data are compared with recent measurements of the inclusive
neutral and charged current e^+p cross sections. For Q^2>1000 GeV^2 clear
evidence is observed for an asymmetry between e^+p and e^-p neutral current
scattering and the generalised structure function xF_3 is extracted for the
first time at HERA. A fit to the charged current data is used to extract a
value for the W boson propagator mass. The data are found to be in good
agreement with Standard Model predictions.


title:
Deep-Inelastic Inclusive ep Scattering at Low x and a Determination of
  alpha_s

abstract:
  A precise measurement of the inclusive deep-inelastic e^+p scattering cross
section is reported in the kinematic range 1.5<= Q^2 <=150 GeV^2 and
3*10^(-5)<= x <=0.2. The data were recorded with the H1 detector at HERA in
1996 and 1997, and correspond to an integrated luminosity of 20 pb^(-1). The
double differential cross section, from which the proton structure function
F_2(x,Q^2) and the longitudinal structure function F_L(x,Q^2) are extracted, is
measured with typically 1% statistical and 3% systematic uncertainties. The
measured partial derivative (dF_2(x,Q^2)/dln Q^2)_x is observed to rise
continuously towards small x for fixed Q^2. The cross section data are combined
with published H1 measurements at high Q^2 for a next-to-leading order DGLAP
QCD analysis.The H1 data determine the gluon momentum distribution in the range
3*10^(-4)<= x <=0.1 to within an experimental accuracy of about 3% for Q^2 =20
GeV^2. A fit of the H1 measurements and the mu p data of the BCDMS
collaboration allows the strong coupling constant alpha_s and the gluon
distribution to be simultaneously determined. A value of alpha
_s(M_Z^2)=0.1150+-0.0017 (exp) +0.0009-0.0005 (model) is obtained in NLO, with
an additional theoretical uncertainty of about +-0.005, mainly due to the
uncertainty of the renormalisation scale.


title:
Search for CP Violation in $D^{0}\to K_{S}^{0}\pi^{0}$, $D^{0}\to
  \pi^{0}\pi^{0}$ and $D^{0}\to K_{S}^{0}K_{S}^{0}$

abstract:
  We have searched for CP-violating asymmetries in neutral charm meson decays
in 13.7 fb^-1 of e^+e^- collision data at sqrt{s} = 10.6 GeV with the CLEO
detector. The measured asymmetries in the rate of D0 and D0bar decays to
K0sPi0, Pi0Pi0 and K0sK0s final states are (+0.1 +- 1.3)%, (+0.1 +- 4.8)% and
(-23 +- 19)%, respectively.


title:
Experimental Issues for Precision Electroweak Physics at a
  High-Luminosity Z Factory

abstract:
  We discuss the ultimate precision for ALR, and therefore for the weak mixing
angle, at a high-luminosity Linear Collider. Drawing on our experience at the
SLC, and considering various machine parameter sets for the NLC and for TESLA,
it emerges that a compromise between peak luminosity and precision will be a
likely outcome. This arises due to the severe requirements on the uncertainty
in the luminosity weighted collision energy (Ecm). We consider the cases with
and without a polarized positron beam.


title: BES Recent Results and Future Plans

abstract:
  We report the preliminary R values for all the 85 energy points scanned in
the energy region of 2-5 GeV with the upgraded Beijing Spectrometer (BESII) at
Beijing Electron Positron Collider (BEPC). Preliminary results from the J/psi
data collected with both BESI and BESII are presented. Measurements of the
branching fraction of the psi(2S) decays and the psi(2S) resonance parameters
are reported. The future plans, i.e. significantly upgrade the machine and
detector are also discussed.


title:
Searching for physics beyond the Standard Model in the decay B+ ->
  K+K+pi-

abstract:
  The observation potential of the decay B+ -> K+K+pi- with the ATLAS detector
at LHC is described in this paper. In the Standard Model this decay mode is
highly suppressed, while in models beyond the Standard Model it could be
significantly enhanced. To improve the selection of the K+K+pi- final state, a
charged hadron identification using Time-over-Threshold measurements in the
ATLAS Transition Radiation Tracker was developed and used.


title: Multianode Photo Multipliers for Ring Imaging Cherenkov Detectors

abstract:
  The 64-channel Multianode Photo Multiplier has been evaluated as a possible
choice for the photo detectors of the LHCb Ring Imaging Cherenkov detector.


title: Status of the LHCb Experiment

abstract:
  We present the status of the LHCb experiment which will make precision
measurements of CP violation in $B$ meson decays. The motivation for the
experiment and an overview of the detector design are given. The vertex
detector, ring imaging Cherenkov counter, calorimeters, and trigger systems are
discussed in detail. We also present the expected physics performance for
selected modes.


title: Rare K+ Decays from Experiment E787

abstract:
  This paper presents the latest results from experiment E787, at Brookhaven
National Laboratory, on K+ -> pi nu/nubar and radiative K+ decays. The result
for K+ -> pi nu/nubar uses data collected in runs taken during 1995, 1996 and
1997. In addition, we discuss plans for future measurements of K+ -> pi
nu/nubar.


title: QCD at the Tevatron: Status and Prospects

abstract:
  I shall review the present status of Tevatron QCD studies, focusing on the
production of jets, vector bosons, photons and heavy quarks. In general there
is good agreement between the results of current calculational tools and the
experimental data. The major areas of discrepancy arise when the input parton
distributions become uncertain (for example, jets at high $E_T$) or when the
momentum scales become relatively small (for example, $b$ production at low
$p_T$). We can look forward to continued improvement in both calculations and
measurements over the next decade. However, fully exploiting the power of the
data will require considerable work, both from the experimentalists who must
understand and publish all the systematic errors and their correlations, and
from the phenomenologists who must understand the level of uncertainty in their
calculations and in the parton distributions.


title: Jet Production in DIS at HERA

abstract:
  Data on jet production in deep inelastic e^+ p scattering are presented.
  The results are compared with pQCD calculations. At low Q^2 no consistent
description of the data over all the phase space is available yet. At high Q^2
(>150 GeV^2) the data are well described by pQCD in NLO.


title: Pion Polarizabilities and Hybrid Meson Structure at CERN COMPASS

abstract:
  CERN COMPASS can investigate pion-photon interactions, to achieve a unique
Primakoff Coulomb physics program, centered on pion polarizability and hybrid
meson structure studies. COMPASS uses 100-280 GeV beams (muon, pion) and a
virtual photon target, and magnetic spectrometers and calorimeters to measure
the complete kinematics of pion-photon reactions. The COMPASS experiment is
scheduled to begin data runs in 2001. Pion polarizabilities and hybrid mesons
can be studied via the Primakoff reactions pion + gamma ---> pion + gamma and
pion + gamma ---> Hybrid. The electric (alpha) and magnetic (beta) pion and
Kaon polarizabilities characterize their deformation in an electromagnetic
field, as occurs during gamma-pion Compton scattering. They depend on the
rigidity of their internal structures as composite particles, and are therefore
important quantities to test the validity of theoretical models. The
polarizability measurement will provide an important new test of QCD chiral
dynamics. The studies of quark-antiquark-gluon hybrid mesons would improve our
understanding of these exotic mesons. COMPASS may improve previous Primakoff
polarizability and Hybrid studies by two to three orders of magnitude.
  Appendixes A (Pion and Kaon Polarizabilities at COMPASS) and B (Hybrid Meson
Structure at COMPASS) of this contribution include evaluations submitted to the
APS DNP Town Meeting White Paper Committee. These summarize (1) the fundamental
scientific issues addressed, (2) major achievements since the last DNP long
range plan, (3) the short and long term U.S. outlook, (4) comparison of U.S.
and global effort, (5) other issues.


title: Semi-hadronic Tau Decays at CLEO

abstract:
  This contribution reviews several new or updated results on substructure in
semi-hadronic tau decays, recently published by the CLEO Collaboration. These
results are all based on data collected with the CLEO detector at Cornell's
CESR collider, in the reaction $e^+e^-\to \tau^+\tau^-$ at $\sqrt{s} \simeq
10.6$ GeV. Most of these results are based on $\approx 4.3\times 10^6$
$\tau^+\tau^-$ pairs collected with the CLEO II detector between 1990 --- 1995.
Some (where noted) also use $\approx 8.0\times 10^6$ $\tau^+\tau^-$ pairs
collected with the CLEO II.V detector (which includes a silicon vertex detector
and better drift chamber tracking) between 1995 --- 1999.


title: Diffractive Dijet and 3-Jet Electroproduction at HERA

abstract:
  A new H1 measurement of diffractive dijet and 3-jet production cross sections
in diffractive deep inelastic scattering events of the type ep->eXY is
presented. The data constrain well the diffractive gluon distribution. At low
x-pom, a calculation based on perturbative QCD is in a reasonable agreement
with the data.


title: Linear Collider Workshop 2000 Summary

abstract:
  We summarize some of the main physics questions that will serve to define the
linear e+e- collider program, and comment on issues that confront the world
community in making such a collider a reality.


title: Photon collider at TESLA: parameters and interaction region issues

abstract:
  Photon colliders (gamma-gamma, gamma-e) are based on backward Compton
scattering of laser light off the high energy electrons of linear colliders.
Recent study has shown that the gamma-gamma luminosity in the high energy peak
can reach 0.3--0.5 L (e+e-). Typical cross sections of interesting processes in
gamma-gamma collisions are higher than those in e+e- collisions by about one
order of magnitude, so the number of events in gamma-gamma collisions will be
more than that in e+e- collisions. In this paper possible parameters of a
photon collider at TESLA and a laser scheme are briefly discussed.


title:
Tests of the Standard Model Using Muon Polarization Asymmetries in Kaon
  Decays

abstract:
  We have examined the physics and the experimental feasibility of studying
various kaon decay processes in which the polarization of a muon in the final
state is measured. Valuable information on CP violation, the quark mixing (CKM)
matrix, and new physics can be obtained from such measurements. We have
considered muon polarization in K_L to mu+ mu- and K to pi mu+ mu- decays.
Although the effects are small, or difficult to measure because of the small
branching ratios involved, these studies could provide clean measurements of
the CKM parameters. The experimental difficulty appears comparable to the
observation of K to pi nu barnu. New sources of physics, involving non-standard
CP violation, could produce effects observable in these measurements. Limits
from new results on the neutron and electron electric dipole moment, and
epsilon-prime over epsilon in neutral kaon decays, do not eliminate certain
models that could contribute to the signal. A detailed examination of muon
polarization out of the decay plane in KMU3 and radiative KMU2 decays also
appears to be of interest. With current kaon beams and detector techniques, it
is possible to measure the T-violating polarization for KMU3 with uncertainties
approaching 0.0001. This level of sensitivity would provide an interesting
probe of new physics.


title: The first physics results from BaBar

abstract:
  The BaBar experiment and the PEP-II accelerator at SLAC started to take data
on May 26, 1999. By the time of this conference, the recorded integrated
luminosity was 20 fb^{-1}, of which 8 fb^{-1} were analyzed to provide a first
set of physics results. This talk reviews the first measurement of sin2beta and
the study of B meson decays to charmonium modes and 2-body charmless decays.


title: What is the Case for a Return to the Z-Pole?

abstract:
  The possibilities to run with a linear collider at the Z-pole with high
luminosity are examined. Apart from the implications on machine and detector
the interest for electroweak and B-physics is discussed.


title:
Bounds on the CP Asymmetry in Like-Sign Dileptons from
  $B^{0}\bar{B}^{0}$ Meson Decays

abstract:
  We have measured the charge asymmetry in like-sign dilepton yields from B^0
B^0-bar meson decays using the CLEO detector at the Cornell Electron Storage
Ring. We find a_ll = [N(l+l+) - N(l-l-)]/[N(l+l+) + N[l-l-)] = +0.013 +/- 0.050
+/- 0.005 . We combine this result with a previous, independent measurement and
obtain Re(epsilon_B)/(1+|epsilon_B|^2) = +0.0035 +/- 0.0103 +/- 0.0015
(uncertainties are statistical and systematic, respectively) for the CP
impurity parameter, epsilon_B.


title: xF3(gamma-Z) in Charged Lepton Scattering

abstract:
  Measurements of the structure function xF3(gamma-Z) are now becoming
available in charged lepton deep inelastic scattering at HERA. The correction
factors which are necessary to compare these with measurements of xF3(nu N) in
neutrino-nucleon scattering are deduced and a comparison is made between the H1
and the CCFR data. A sum rule is derived for the structure function
xF3(gamma-Z)measured in charged lepton scattering which is the analogue of the
Gross Llewellyn-Smith sum rule for neutrino-nucleon scattering.


title: Precision Electroweak Measurements

abstract:
  This talk describes some of the precision electroweak measurements from
around the world, namely those related to the Z and W bosons, the top quark
mass, sin2 theta_ W at NuTeV, and three other fundamental measurements: alpha-1
m2_ Z, (g-2)_mu at the E821 BNL experiment as well as the atomic parity
violation (APV) measurement for the Cesium atom. These and other measurements
are set in the context of the Standard Model (SM) and of the electroweak fit
predictions. Future prospects for forthcoming experiments are briefly
discussed.


title: Recent Results on Particle Production from OPAL

abstract:
  Three recent OPAL studies are presented in which the fragmentation process in
quark and gluon jets and in identified up, down and strange flavour jets is
studied. The first is a measurement of charged particle, pi0, eta and K0
multiplicities in quark and gluon jets. No evidence is found for a
particle-species dependent multiplicity enhancement in gluon jets. In another
study leading pion, kaon, K0, proton and lambda rates have been measured in up,
down and strange flavour jets. The results confirm the leading particle effect
in the fragmentation of light flavour jets. In addition, a direct determination
of the strangeness suppression factor has been performed, yielding
gamma_s=0.422 +/- 0.049(stat.) +/- 0.059(syst.). In a third study, mean charged
particle multiplicities were measured for up, down and strange flavoured Z0
decays and found to be identical within the uncertainties of the measurement,
as expected from the flavour independence of the strong interaction.


title: Constraining CP-Violating TGCs and Measuring W-Polarization at OPAL

abstract:
  A measurement of the polarization of W bosons in semi-leptonically decaying W
pairs produced at 189 GeV is presented. Rates of longitudinally and
transversely polarized W bosons and correlation between two W bosons are
studied. The spin properties of the leptonically decaying W boson in the W
pairs was used to measure the CP-violating trilinear gauge boson couplings.
These results are compared with Standard Model expectations.


title: The challenge of hybridization

abstract:
  Hybridization of pixel detector systems has to satisfy tight requirements:
high yield, long term reliability, mechanical stability, thermal compliance and
robustness have to go together with low passive mass added to the system,
radiation hardness, flexibility in the technology end eventually low cost. The
current technologies for the interconnection of the front-end chips and the
sensor are reviewed and compared, together with the solutions for the interface
to the far-end electronics.


title:
Characterisation of Hybrid Pixel Detectors with capacitive charge
  division

abstract:
  In order to fully exploit the physics potential of the future high energy e+
e- linear collider, a Vertex Tracker providing high resolution track
reconstruction is required. Hybrid pixel sensors are an attractive technology
due to their fast read-out capabilities and radiation hardness. A novel pixel
detector layout with interleaved cells between the readout nodes has been
developed to improve the single point resolution. The results of the
characterisation of the first processed prototypes are reported.


title: Measurement of Vcb and Charmless Hadronic B decays at CLEO

abstract:
  The recent results on the measurement of Vcb and charmless hadronic B decays
from CLEO are presented.


title:
Search for the Standard Model Higgs Boson in e+e- Collisions at sqrt(s)
  = 192-209 GeV

abstract:
  A search for the Standard Model Higgs boson has been performed with the OPAL
detector at LEP based on the full data sample collected at sqrt(s) = 192-209
GeV in 1999 and 2000, corresponding to an integrated luminosity of
approximately 426 pb-1. The data are examined for their consistency with the
background-only hypothesis and various Higgs boson mass hypotheses. A lower
bound of 109.7 GeV is obtained on the Higgs boson mass at the 95% confidence
level. At higher masses, the data are consistent with both the background and
the signal-plus-background hypotheses.


title: Searches at LEP

abstract:
  Searches have been conducted for a broad range of new phenomena by the four
experiments ALEPH, DELPHI, L3, and OPAL, at LEP2. Each experiment contributes
approximately 150 pb-1 of e+e- annihilation data with a mean sqrt(s) of 205.9
GeV in 2000 to these searches (data prepared for the September 5 LEPC meeting).
The statistical procedure for setting limits and evaluating the significance of
excesses observed in the data is reviewed. Search results are presented for the
Standard Model Higgs boson, the neutral Higgs bosons in the MSSM, charged Higgs
bosons, invisibly decaying Higgs bosons produced by Higgs-strahlung, and
fermiophobic Higgs bosons. Search results are briefly summarized for gauginos,
stops, and staus. The photon recoil spectrum is checked for hints of new
physics.


title: Standard Model Physics Results from LEP2

abstract:
  At LEP2 many Standard Model predictions are tested up to centre-of-mass
energies of 209 GeV. Fermion pair production cross sections and asymmetries
agree well with the theoretical expectation over the entire energy range. The
measurements are used to determine the gamma/Z interference and to search for
contact interactions up to 20 TeV. The cross sections for single-W, ZZ and W+W-
production agree well with the expectations. The branching fractions of the W
boson into hadrons and leptons are determined as well as the CKM matrix element
|V_{cs}|. Precise measurements of the W mass and width are presented yielding
MW=80.427+-0.046 GeV and GammaW=2.12=_0.11 GeV. All electroweak data are very
consistent with the Standard Model predictions. In a combined fit using the
recent value of Delta alpha_{had}^(5)(s) the mass of the Higgs boson is
constrained to MH=88^{+60}_{-37} GeV.


title:
The MECO experiment: A search for lepton flavor violation in muonic
  atoms

abstract:
  MECO will search for direct evidence of muon and electron flavor violation in
the decay of muons in Coulomb bound states via coherent recoil of the nucleus
and decay electron. The expected sensitivity to the $\mu^{-} {\rm N} \to e^{-}
+ {\rm N}$ branching fraction relative to muon capture $\mu^{-} {\rm N}(A,Z)
\to \nu_{\mu} + {\rm N}(A,Z-1)$ is $R_{\mu e} < 5\times 10^{-17}$ at 90%
confidence level, roughly three to four orders of magnitude lower than current
limits. This article provides an overview of the experiment.


title: Neutrino Experiments : Highlights

abstract:
  This article consists of two parts. The first section presents the highlights
on the goals of neutrino physics, status of the current neutrino experiments
and future directions and program. The second section describes the theme,
program and research efforts for the TEXONO Collaboration among scientists from
Taiwan and China.


title: MACRO and the atmospheric neutrino problem

abstract:
  After a brief presentation of the MACRO detector we discuss the updated data
on atmospheric muon neutrinos, and the interpretation in terms of neutrino
oscillations.


title:
Hybrid pixel detector development for the Linear collider Vertex
  Detector

abstract:
  In order to fully exploit the Physics potential of future e+ e- linear
collider, a Vertex Detector providing high resolution track reconstruction is
required. Hybrid Silicon pixel detectors are an attractive option for the
sensor technology due to their read-out speed and radiation hardness but have
been so far limited by the achievable single point resolution. A novel layout
of hybrid pixel sensor with interleaved cells to improve the spatial resolution
has been developed. The characterisation of the first processed prototypes is
reported.


title: First Physics Results From Belle

abstract:
  The Belle detector at the KEK-B asymmetric $e^{+}e^{-}$ collider has recorded
6.2 fb$^{-1}$ data at the $\Upsilon(4S)$ resonance by July 2000. Using this
data sample, several new results on various B meson branching ratio
measurements are presented. We also report on the measurement of the Standard
Model CP violation parameter $\sin(2\phi_{1})$, where $\phi_{1}$ is one of
angles of the CKM triangle. The preliminary result is $\sin(2\phi_{1})$ =
$0.45^{+0.43 \pm 0.07}_{-0.44 \pm 0.08}$.


title: New results on alpha_s and optimized scales

abstract:
  A summary of the latest alpha_s results at LEP1 and LEP2 from event-shape
predictions at Order(alpha2_s) + NLLA is presented. Later these are compared to
measurements obtained using the Experimentally Optimized Scale method. Finally
the alpha_s measurement from the 4-jet rate is discussed.


title:
Development of a radiation hard version of the Analog Pipeline Chip
  APC128

abstract:
  The Analog Pipeline Chip (APC) is a low noise, low power readout chip for
silicon micro strip detectors with 128 channels containing an analog pipeline
of 32 buffers depth. The chip has been designed for operation at HERA with a
power dissipation of 300-400 muW per channel and has been used also in several
other particle physics experiments. In this paper we describe the development
of a radiation hard version of this chip that will be used in the H1 vertex
detector for operation at the luminosity upgraded HERA machine. A 128 channel
prototyping chip with several amplifier variations has been designed in the
radiation hard DMILL technology and measured. The results of various parameter
variations are presented in this paper. Based on this, the design choice for
the final production version of the APC128-DMILL has been made.


title: Prospects for low-energy antiproton physics at Fermilab

abstract:
  Fermilab has long had the world's most intense antiproton source, but the
opportunities for medium-energy antiproton physics have been limited, and those
for low-energy antiproton physics nonexistent. The conclusion of E835 brings
this era to an end. While the future of antiproton physics at Fermilab remains
highly uncertain, developments are occurring that may lead to a low-energy
program within the next several years, with the possibility of an improved
medium-energy program thereafter. These issues were considered at the recent
$\bar{p}2000$ Workshop at Illinois Institute of Technology. I summarize the
current status of the Fermilab antiproton facility, review hyperon {\em CP}
violation as an example of the physics that might be achievable, and discuss
future possibilities.


title:
Measurement of the Charm Production Cross Section in gamma gamma
  Collisions at LEP

abstract:
  Open charm production in gamma-gamma collisions is studied with data
collected at e+e- centre-of-mass energies from 189 GeV to 202 GeV corresponding
to a total integrated luminosity of 410 pb-1. The charm cross section
sigma(gamma gamma ---> c c~ X) is measured for the first time as a function of
the two-photon centre-of-mass energy in the interval from 5 GeV to 70 GeV and
is compared to NLO QCD calculations.


title: Colour Reconnection at LEP2

abstract:
  Colour reconnection is the final state interaction between quarks from
different sources. It is not yet fully understood and is a source of systematic
error for W-boson mass and width measurements in hadronic \WW decays at LEP2.
The methods of measuring this effect and the results of the 4 LEP experiments
at $183\gev\leq\rts\leq 202\gev$ will be presented.


title:
Combination procedure for the precise determination of Z boson
  parameters from results of the LEP experiments

abstract:
  The precise determination of the Z boson parameters from the measurements at
the Z resonance by the four collaborations ALEPH,
  DELPHI, L3 and OPAL in e+e- collisions at the large electron positron
collider LEP at CERN is a landmark for precision tests of the electroweak
theory. The four experiments measured quantities which were used to extract the
mass and width of the Z boson, the hadronic cross-section at the pole of the
resonance, the ratio of hadronic and leptonic decay widths, and the leptonic
forward-backward asymmetries at the pole. The combination procedure based on
these parameters is presented in this paper.


title:
Higgs self coupling measurement in e+e- collisions at center-of-mass
  energy of 500 GeV

abstract:
  Feasibility of the measurement of the trilinear self-couplings of the Higgs
boson is studied. Such a measurement would experimentally determine the
structure of the Higgs potential. Full hadronic and semi-leptonic final states
of the double-Higgs strahlung have been investigated.


title: A Search for Charmless $B\to VV$ Decays

abstract:
  We have studied two-body charmless decays of the $B$ meson into the final
states $\rho^0 \rho^0$, $K^{*0} \rho^0$, $K^{*0} K^{*0}$, $K^{*0}
\bar{K^{*0}}$, $K^{*+} \rho^0$, $K^{*+} \bar{K^{*0}}$, and $K^{*+} K^{*-}$
using only decay modes with charged daughter particles. Using 9.7 million $B
\bar{B}$ pairs collected with the CLEO detector, we place 90% confidence level
upper limits on the branching fractions, $(0.46-7.0)\times 10^{-5}$, depending
on final state and polarization.


title: Exclusive electroproduction of phi mesons at 4.2 GeV

abstract:
  We studied the exclusive reaction e p --> e' p' phi using the phi --> K^+ K^-
decay mode. The data were collected using a 4.2 GeV incident electron beam and
the CLAS detector at Jefferson Lab. Our experiment covers the range in Q^2 from
0.7 to 2.2 GeV^2, and W from 2.0 to 2.6 GeV. Taken together with all previous
data, we find a consistent picture of phi production on the proton. Our
measurement shows the expected decrease of the t-slope with the vector meson
formation time c Delta tau below 2 fm. At = 0.6 fm, we measure b_phi = 2.27 +-
0.42 GeV^-2. The cross section dependence on W as W^{0.2+-0.1} at Q^2 = 1.3
GeV^2 was determined by comparison with phi production at HERA after correcting
for threshold effects. This is the same dependence as observed in
photoproduction.


title: Glueballs, Hybrids and Q\bar Q Mesons

abstract:
  Lattice gauge calculations predict the existence of glueballs. In particular
a scalar glueball is firmly expected at a mass of about 1730 MeV. This
prediction has led to an intense study of scalar isoscalar interactions and to
the discovery of new meson resonances. The number of scalar states observed
seems to exceed the number of states which can be accommodated in the quark
model even when two states, the a_0(980) and f_0(980), are interpreted as K
Kbar bound states and are removed from the list. However, none of these states
has a decay pattern which is consistent with that of a pure glueball. A
reasonable interpretation of the number of states and of their decay pattern is
found only when mixing of scalar q qbar states with the scalar glueball is
taken into account.
  In this paper we scrutinize the evidence for these states and their
production characteristics. The f_0(1370) - a cornerstone of all qbar
q-glueball mixing scenarios - is shown to be likely of non-qbar q nature. The
remaining scalar states then do fit into a nonet classification. If this
interpretation should be correct there would be no room for resonant scalar
gluon-gluon interactions, no room for the scalar glueball.
  We also discuss the status of mesons with exotic quantum numbers, of mesons
which cannot possibly have qbar q structure, and argue that these are, most
likely, four-quark states and not excitations of the gluon string providing the
binding between quark and antiquark.


title: Observation of $B\to \phi K$ and $B\to \phi K^{*}$

abstract:
  We have studied two-body charmless hadronic decays of $B$ mesons into the
final states phi K and phi K^*. Using 9.7 million $B\bar{B}$ pairs collected
with the CLEO II detector, we observe the decays B- -> phi K- and B0 -> phi K*0
with the following branching fractions: BR(B- -> phi K-)=(5.5 +2.1-1.8 +- 0.6)
x 10^{-6} and BR(B0 -> phi K*0)=(11.5 +4.5-3.7 +1.8-1.7) x 10^{-6}. We also see
evidence for the decays B0 -> phi K0 and B- -> phi K*-. However, since the
statistical significance is not overwhelming for these modes we determine upper
limits of <12.3 x 10^{-6} and <22.5 x 10^{-6} (90% C.L.) respectively.


title: CP Results from Belle

abstract:
  The Belle detector at KEKB has collected 6.2 fb^{-1} of data at the
Upsilon(4S) resonance. Presented here are preliminary measurements, from this
data sample, of sin(2phi_1) and other quantities relating to CP.


title: Measurement of direct CP violation by the NA48 experiment at CERN

abstract:
  The NA48 experiment at CERN has performed a measurement of direct CP
violation in the neutral kaon system, based on data collected in 1997 and 1998.
The preliminary result for the parameter $\Re(\epsilon^{\prime}/\epsilon)$ is
$(14.0 \pm 4.3) \times 10^{-4}$.


title: Physics at BABAR

abstract:
  The BABAR detector at the SLAC PEP-II asymmetric e+e- collider has first
started collecting data in May 1999. A study of time-dependent CP-violating
asymmetries in B0 --> J/psi K0S and B0 --> psi(2S) K0S decays has been
performed on a data sample of 9.0fb-1 taken at the Y(4S) resonance and 0.8fb-1
off-resonance, collected through July 2000. The preliminary result sin2beta =
0.12+/-0.37 (stat) +/- 0.09 (syst) is presented here, together with preliminary
results on neutral and charged B meson lifetimes and B0B0bar mixing.


title:
Measurement of the $t\bar{t} production cross section in $p\bar{p}$
  collisions at $\sqrt{s}$ = 1.8 TeV

abstract:
  We update the measurement of the top production cross section using the CDF
detector at the Fermilab Tevatron. This measurement uses $t\bar{t}$ decays to
the final states $e+\nu$+jets and $\mu+\nu$+jets. We search for $b$ quarks from
$t$ decays via secondary-vertex identification or the identification of
semileptonic decays of the $b$ and cascade $c$ quarks. The background to the
$t\bar{t}$ production is determined primarily through a Monte Carlo simulation.
However, we calibrate the simulation and evaluate its uncertainty using several
independent data samples. For a top mass of 175 $GeV/c^2$, we measure
$\sigma_{t\bar{t}}=5.1 \pm 1.5$ pb and $\sigma_{t\bar{t}}=9.2 \pm 4.3$ pb using
the secondary vertex and the lepton tagging algorithms, respectively. Finally,
we combine these results with those from other $t\bar{t}$ decay channels and
obtain $\sigma_{t\bar{t}} = 6.5^{+1.7}_{-1.4}$ pb.


title:
Particle Dark Matter and Solar Axion Searches with a small germanium
  detector at the Canfranc Underground Laboratory

abstract:
  A small, natural abundance, germanium detector (COSME) has been operating
recently at the Canfranc Underground Laboratory (Spanish Pyrenees) in improved
conditions of shielding and overburden with respect to a previous operation of
the same detector. An exposure of 72.7 kg day in these conditions has at
present a background improvement of about one order of magnitude compared to
the former operation of the detector. These new data have been applied to a
direct search for WIMPs and solar axions. New WIMP exclusion plots improving
the current bounds for low masses are reported. The paper also presents a limit
on the axion-photon coupling obtained from the analysis of the data looking for
a Primakoff axion-to-photon conversion and Bragg scattering inside the crystal.


title: Search for QCD-instantons at HERA

abstract:
  Signals of QCD instanton induced processes are searched for in deep-inelastic
ep scattering at HERA in a kinematic region defined by the Bjorken scaling
variables x>0.001, 0.1<y<0.6 and polar angle of the scattered positron >156
degrees. Upper limits are derived from the expected instanton-induced final
state properties based on the QCDINS Monte Carlo model.


title: Measurement of electron-neutrino electron elastic scattering

abstract:
  The cross section for the elastic scattering reaction nu_e+e- -> nu_e+e- was
measured by the Liquid Scintillator Neutrino Detector using a mu+ decay-at-rest
nu_e beam at the Los Alamos Neutron Science Center. The standard model of
electroweak physics predicts a large destructive interference between the
charge current and neutral current channels for this reaction. The measured
cross section, sigma_{nu_e e-}=[10.1 +- 1.1(stat.) +- 1.0(syst.)]x E_{nu_e}
(MeV) x 10^{-45} cm^2, agrees well with standard model expectations. The
measured value of the interference parameter, I=-1.01 +- 0.13(stat.) +-
0.12(syst.), is in good agreement with the standard model expectation of
I^{SM}=-1.09. Limits are placed on neutrino flavor-changing neutral currents.
An upper limit on the muon-neutrino magnetic moment of 6.8 x 10^{-10} mu_{Bohr}
is obtained using the nu_mu and \bar{nu}_mu fluxes from pi+ and mu+ decay.


title: MONOLITH: a next generation experiment for athospheric neutrinos

abstract:
  MONOLITH is a massive magnetized tracking calorimeter, optimized for the
detection of atmospheric muon neutrinos, proposed at the Gran Sasso laboratory
in Italy. The main goal is to establish (or reject) the neutrino oscillation
hypothesis through an explicit observation of the full first oscillation swing
(the ``L/E pattern''). Its performance, status and prospects are briefly
reviewed.


title: Search for heavy neutrinos mixing with tau neutrinos

abstract:
  We report on a search for heavy neutrinos ($\nus$) produced in the decay
$D_s\to \tau \nus$ at the SPS proton target followed by the decay $\nudecay$ in
the NOMAD detector. Both decays are expected to occur if $\nus$ is a component
of $\nu_{\tau}$.\
  From the analysis of the data collected during the 1996-1998 runs with
$4.1\times10^{19}$ protons on target, a single candidate event consistent with
background expectations was found. This allows to derive an upper limit on the
mixing strength between the heavy neutrino and the tau neutrino in the $\nus$
mass range from 10 to 190 $\rm MeV$. Windows between the SN1987a and Big Bang
Nucleosynthesis lower limits and our result are still open for future
experimental searches. The results obtained are used to constrain an
interpretation of the time anomaly observed in the KARMEN1 detector.\


title: Status of the BNL Muon g-2 Experiment

abstract:
  The muon g-2 experiment at Brookhaven has been taking data since 1997.
Analyses of the data taken in 1997 and 1998, which include about 2% of the data
taken so far, have improved the experimental accuracy in the muon anomalous
magnetic moment to a(mu,expt) = 1 165 921(5) x 10**(-9) (4 ppm). The value
agrees with standard theory. Analysis of the 1999 data, about 25% of the
existing data set, is nearing completion and analysis of the 2000 data has
started. The experiment is preparing for another major data taking run, this
time storing negative instead of positive muon beams.


title:
Search for the radiative decay $\eta \to \pi^0 \gamma \gamma$ in the SND
  experiment at VEPP-2M

abstract:
  The $\eta \to \pi^0 \gamma \gamma$ decay was investigated by the SND detector
at VEPP-2M $e^+e^-$ collider in the reaction $e^+e^-\to\phi\to \eta\gamma$.
Here we present the results and some details of this study. We report an upper
limit (90% c.l.) $Br(\eta \to \pi^0 \gamma \gamma)<8.4\times 10^{-4}$ as our
final result. Our upper limit does not contradict the earlier measurement by
GAMS spectrometer. To facilitate future studies a rather detailed review of the
problem is also given.


title:
A Simultaneous Measurement of the QCD Colour Factors and the Strong
  Coupling

abstract:
  Using data from e+e- annihilation into hadrons, taken with the OPAL detector
at LEP at the Z pole between 1991 and 1995, we performed a simultaneous
measurement of the colour factors of the underlying gauge group of the strong
interaction, CF and CA, and the strong coupling, alpha(s). The measurement was
carried out by fitting next-to-leading order perturbative predictions to
measured angular correlations of 4-jet events together with multi-jet related
variables. Our results,
  CA = 3.02 +/- 0.25 (stat.) +/- 0.49 (syst.),
  CF = 1.34 +/- 0.13 (stat.) +/- 0.22 (syst.), alpha(s)(M_Z) = 0.120 +/- 0.011
(stat.) +/- 0.020 (syst.), provide a test of perturbative QCD in which the only
assumptions are non-abelian gauge symmetry and standard hadronization models.
The measurements are in agreement with SU(3) expectations for CF and CA and the
world average of alpha(s)(M_Z).


title: A Search for a Narrow Radial Excitation of the D*+/- Meson

abstract:
  A sample of 3.73 million hadronic Z decays, recorded with the OPAL detector
at LEP in the years 1991-95, has been used to search for a narrow resonance
corresponding to the decay of the D*'+/-(2629) meson into D*+/- pi+ pi-. The
D*+ mesons are reconstructed in the decay channel D*+ -> D0 pi+ with D0 -> K-
pi+. No evidence for a narrow D*'+/-(2629) resonance is found. A limit on the
production of D*'+/-(2629) in hadronic Z decays is derived: f(Z ->
D*'+/-(2629)) x Br(D*'+ -> D*+ pi+ pi-) < 3.1 x 10^{-3} (95% C.L.)


abstract:
  Results on Deeply Virtual Compton Scattering at HERA measured by the H1 and
ZEUS Collaborations are presented. The cross section, measured for the first
time, is reported for Q^2 > 2 GeV^2.


title: Polarization and Spin Alignment in Multihadronic Z0 Decays

abstract:
  The large statistics of millions of hadronic Z0 decays, accumulated by the
four LEP experiments between 1989 and 1995, allowed for detailed investigations
of the fragmentation process. Inclusive Lambda_b baryons and Lambda hyperons at
intermediate and high momentum have been found to show longitudinal
polarization. This may be related to the primary quark and antiquark
polarization and the hadronization mechanism which produces the leading
baryons. Helicity density-matrix elements have been measured for a variety of
vector mesons produced inclusively in hadronic Z0 decays. The diagonal elements
of some of the light mesons and the D*+- show a preference for a helicity-zero
state if the meson carries a large fraction of the available energy. The
mechanism which produces such spin alignment in the non-perturbative
hadronization of the primary partons to the vector mesons is so far
unexplained. For the B* the results are consistent with no spin alignment,
which is expected in a picture based on HQET. For some meson species
non-diagonal elements have been measured indicating coherence phenomena due to
final-state interaction between the primary quark and antiquark.


title: The D0 Detector Upgrade and Physics Program

abstract:
  The D0 detector at Fermilab is in the final stages of an extensive upgrade.
It is designed to meet the demands imposed by high luminosity Tevatron running
planned to begin March 2001. The design and performance of the detector
subsystems are described and a brief outline of the physics potential is
presented.


title: Predicting Neutron Production from Cosmic-ray Muons

abstract:
  Fast neutrons from cosmic-ray muons are an important background to
underground low energy experiments. The estimate of such background is often
hampered by the difficulty of measuring and calculating neutron production with
sufficient accuracy. Indeed substantial disagreement exists between the
different analytical calculations performed so far, while data reported by
different experiments is not always consistent. We discuss a new unified
approach to estimate the neutron yield, the energy spectrum, the multiplicity
and the angular distribution from cosmic muons using the Monte Carlo simulation
package FLUKA and show that it gives a good description of most of the existing
measurements once the appropriate corrections have been applied.


title:
Searches for Rare and Forbidden Decays of Charm: Recent Results from
  FNAL

abstract:
  We review results on rare and forbidden decays of D^0, D^+, and D^+_s mesons
from experiments at FNAL. The decay modes studied have two leptons in the final
state and, if observed, would constitute evidence for flavor-changing
neutral-current, lepton-flavor-violating, or lepton-number-violating processes.
To date, no evidence for these decays has been observed and upper limits are
obtained for their branching fractions. These limits can constrain various
extensions to the Standard Model. We present new upper limits from FNAL E791 on
the branching fractions for more than two dozen three- and four-body decay
modes.


title:
Correlated /\c-/\cbar production in e+e- annihilations at sqrt{s}~10.5
  GeV

abstract:
  Using 13.6/fb of continuum two-jet e+e- -> ccbar events collected with the
CLEO detector, we have searched for baryon number correlations at the primary
quark level. We have measured the likelihood for a /\c+ charmed baryon to be
produced in the hemisphere opposite a /\c- relative to the likelihood for a
/\c+ charmed baryon to be produced opposite an anticharmed meson Dbar; in all
cases, the reconstructed hadrons must have momentum greater than 2.3 GeV/c. We
find that, given a /\c- (reconstructed in five different decay modes), a /\c+
is observed in the opposite hemisphere (0.72+/-0.11)% of the time (not
corrected for efficiency). By contrast, given a Dbar in one hemisphere, a /\c+
is observed in the opposite hemisphere only (0.21+/-0.02)% of the time.
Normalized to the total number of either /\c- or Dbar ``tags'', it is therefore
3.52+/-0.45+/-0.42 times more likely to find a /\c+ opposite a /\c- than a Dbar
meson. This enhancement is not observed in the JETSET 7.3 e+e- -> ccbar Monte
Carlo simulation.


title: J/psi suppression in Pb-Pb collisions at CERN SPS

abstract:
  The NA38 and NA50 experiments at the CERN SPS have measured charmonium
production in different colliding systems with the aim of observing a phase
transition from ordinary hadronic matter towards a state in which quarks and
gluons are deconfined (Quark Gluon Plasma, QGP). In fact it was predicted that
the J/psi yield should be suppressed in deconfined matter. The analysis of the
data collected by the NA50 experiment with Pb-Pb collisions at 158 GeV/c per
nucleon shows that the J/psi is anomalously suppressed in central collisions
and the observed pattern can be considered as a strong indication for QGP
production.


title: Multiparticle Correlations at LEP1

abstract:
  Bidding farewell to the LEP accelerator, we acknowledge that an essential
part of its legacy is the immense amount of data collected during 5 years of
the LEP1 stage, at the Z peak. This set of data allows for detailed studies of
many phenomena, and particularly, of the final state interactions between
hadrons. Presented here is a review of the most recent analyses in this area.


title: First Measurement of the CP-Violating Asymmetries with BABAR

abstract:
  We report on a preliminary measurement of time-dependent CP-violating
asymmetries in B0 --> J/psi K0S and B0 --> psi(2S) K0S decays recorded by the
BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample
consisted of 9.0 fb-1 collected at the Y(4S) resonance and 0.8 fb-1
off-resonance. One of the pair of neutral B mesons produced at the Y(4S) was
fully reconstructed, while the flavor of the other neutral B meson was tagged
at the time of its decay. The value of the asymmetry amplitude, sin(2beta), was
determined from a maximum likelihood fit to the time distribution of 120 tagged
candidates to be sin(2beta) = 0.12 +- 0.37 (stat.) +- 0.09 (syst.)
(preliminary).


title: Higgs and B physics in Run II

abstract:
  In Run II at the Tevatron, the major goal of the upgraded CDF and \dzero
detectors is a Higgs search in the mass range of 110-200 GeV. They will also
contribute significantly to B physics. Among many possibilities they will be
able to measure rare decays of B mesons and improve our knowledge of CP
violation in B system through study of B mixing. Various aspects of Higgs and B
physics in Run II are discussed here.


title: Light Higgs Production at a Photon Collider

abstract:
  We present a preliminary study of the production of a light Higgs boson with
a mass between 120 and 160 GeV in photon-photon collisions at a Compton
collider. The event generator for the backgrounds to a Higgs signal due to
bbbar and ccbar heavy quark pair production in polarized Gamma-Gamma collisions
is based on a complete next-to-leading order (NLO) perturbative QCD
calculation. For J_z=0 the large double-logarithmic corrections up to four
loops are also included. It is shown that the two-photon width of the Higgs
boson can be measured with high statistical accuracy of about 2-10% for
integrated Gamma-Gamma luminosity in the hard part of the spectrum of 43 fb-1.
  From this result the total Higgs boson width can be derived in a model
independent way.


title: Inter-W Bose-Einstein Correlations ... or Not?

abstract:
  A critical summary is given of the present status of the study of
Bose-Einstein Correlations in W-pair production at LEP II. In particular, the
evidence is reviewed for or against the existence of Bose-Einstein correlations
between pions originating both from a different of the two W's. If present,
such an inter-W interference would not only form a potential bias in the
determination of the W mass, but also would provide a laboratory to measure the
space-time development of the overlap. If absent, this would drastically change
the conventional (Hanbury Brown and Twiss) picture of pion interferometry in
high energy physics.


title:
Observation of exotic meson production in the reaction $ \pi^{-} p \to
  \eta^{\prime} \pi^- p$ at 18 GeV/c

abstract:
  An amplitude analysis of an exclusive sample of 5765 events from the reaction
$\pi^{-} p \to \eta^{\prime} \pi^- p$ at 18 GeV/c is described. The
$\eta^{\prime} \pi^-$ production is dominated by natural parity exchange and by
three partial waves: those with $J^{PC} = 1^{-+}, 2^{++},$ and $4^{++}$. A
mass-dependent analysis of the partial-wave amplitudes indicates the production
of the $a_2(1320)$ meson as well as the $a_4(2040)$ meson, observed for the
first time decaying to $\eta^{\prime}\pi^-$. The dominant, exotic
(non-$q\bar{q}) $ $1^{-+}$ partial wave is shown to be resonant with a mass of
$1.597 \pm 0.010^{+0.045}_{-0.010}$ GeV/c^2 and a width of $0.340 \pm 0.040 \pm
0.050$ GeV/c^2 . This exotic state, the $\pi_1(1600)$, is produced with a $t$
dependence which is different from that of the $a_2(1320)$ meson, indicating
differences between the production mechanisms for the two states.


title: BSAURUS- A Package For Inclusive B-Reconstruction in DELPHI

abstract:
  BSAURUS is a software package for the inclusive reconstruction of B-hadrons
in Z-decay events taken by the DELPHI detector at LEP. The BSAURUS goal is to
reconstruct B-decays, by making use of as many properties of b-jets as
possible, with high efficiency and good purity. This is achieved by exploiting
the capabilities of the DELPHI detector to their extreme, applying wherever
possible physics knowledge about B production and decays and combining
different information sources with modern tools- mainly artificial neural
networks. This note provides a reference of how BSAURUS outputs are formed, how
to access them within the DELPHI framework, and the physics performance one can
expect.


title:
Improved Measurement of the Probability for Gluon Splitting into b bbar
  in Z0 Decays

abstract:
  We have measured gluon splitting into bottom quarks, g -> b bbar, in hadronic
Z0 decays collected by SLD between 1996 and 1998. The analysis was performed by
looking for secondary bottom production in 4-jet events of any primary flavor.
4-jet events were identified, and in each event a topological vertex-mass
technique was applied to the two jets closest in angle in order to identify
them as b or bbar jets. The upgraded CCD vertex detector gives very high
B-tagging efficiency, especially for B hadrons with the low energies typical of
this process. We measured the rate of g -> b bbar production per hadronic
event, g_bb, to be (2.44+-0.59 (stat) +-0.34 (syst)) X10**-3.


title:
Measurements of the Cross Section for e+e- -> hadrons at Center-of-Mass
  Energies from 2 to 5 GeV

abstract:
  We report values of $R = \sigma(e^+e^-\to
{hadrons})/\sigma(e^+e^-\to\mu^+\mu^-)$ for 85 center-of-mass energies between
2 and 5 GeV measured with the upgraded Beijing Spectrometer at the Beijing
Electron-Positron Collider.


title: Recent NA49 results on Pb+Pb collisions at CERN SPS

abstract:
  In the spirit of establishing a fair reference for nucleus-nucleus
collisions, results on stopping and baryon transfer, correlations of the p+p
interaction and their consequences are shown. In the discussion of new results
from nucleus-nucleus collisions the emphasis is on strange meson and baryon
production at different energies - for the first time at 40 GeV A - with the
study of light nuclei.


title: Experimental correlation analysis: foundations and practice

abstract:
  Commonalities and differences in correlation analysis in terms of phase
space, conditioning and uncorrelatedness are discussed. The Poisson process is
not generally appropriate as reference distribution for normalisation and
cumulants, so that generalised statistics in terms of arbitrarily defined
reference processes must be employed. Consideration of the sampling hierarchy
leads us to a classification of current event-by-event observables.


title: Mixing and CP Violation in the Decay of Neutral D Mesons at CLEO

abstract:
  We present preliminary results of several analyses searching for the effects
of CP violation and mixing in the decay of D0 mesons. We find no evidence of CP
asymmetry in five different two-body decay modes of the D0 to pairs of light
pseudo-scalar mesons: A_CP(K+ K-) = (+0.05 +- 2.18 +- 0.84)%, A_CP(pi+ pi-) =
(+2.0 +- 3.2 +- 0.8)%, A_CP(K0_S pi0) = (+0.1 +- 1.3)%, A_CP(pi0 pi0) = (+0.1
+- 4.8)% and A_CP(K0_S K0_S) = (-23 +- 19)%. We present the first measurement
of the rate of wrong-sign D0 -> K+ pi- pi0 decay: R_WS = 0.0043 + 0.0011 -
0.0010 +- 0.0007. Finally, we describe a measurement of the mixing parameter
y_CP= Delta Gamma / (2 Gamma) by searching for a lifetime difference between
the CP neutral K+ pi- final state and the CP even K+K- and pi+pi- final states.
Under the assumption that CP is conserved we find y_CP = -0.011 +- 0.025 +-
0.014.


title: First Measurement of $\Gamma(D^{*+})$

abstract:
  We have made the first measurement of the D*+ width using 9/fb of e+e- data
collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method
uses advanced tracking techniques and a reconstruction method that takes
advantage of the small vertical size of the CESR beam spot to measure the
energy release distribution from the D*+ -> D0 pi+ decay. Our preliminary
result is Gamma(D*+) = 96 +- 4 (Statistical) +- 22 (Systematic) keV.


title: Jet Physics at HERA

abstract:
  Jet production in electron-proton collisions at HERA provides a unique
testing ground for Quantum Chromodynamics (QCD). Apart from the determination
of the strong coupling constant $\alpha_s$, ep jet data may especially be used
to gain insight into the dynamics of the exchanged parton cascade, whose
structure is probed by the high-$E_T$ dijet system; thus information on the
parton content of the proton and (quasi-)-real and virtual photons is obtained.
This report touches some of these aspects revealed in recent jet data from the
HERA experiments which are testing perturbative QCD at the limits of
applicability.


title:
Universality in hadron production in electron-positron, lepton-hadron
  and hadron-hadron reactions

abstract:
  According to the concept of universality in hadron production, the basic
mechanisms of hadron formation are the same in all high-energy e+e-, lh and hh
reactions, with differences in the composition of final-state particle types
being due only to differences in initial parton flavours and configurations.
This concept is discussed in the light of recent data and phenomenology.


title: Electroweak and B Physics Results from the Fermilab Tevatron Collider

abstract:
  This writeup is an introduction to some of the experimental issues involved
in performing electroweak and B physics measurements at the Fermilab Tevatron.
In the electroweak sector, we discuss W and Z boson cross section measurements
as well as the measurement of the mass of the W boson. For B physics, we
discuss measurements of B^0/\bar{B^0} mixing and CP violation. This paper is
geared towards nonexperts who are interested in understanding some of the
issues and motivations for these measurements and how the measurements are
carried out.


title:
Precise measurement of the total cross section and the Coulomb
  scattering at the LHC

abstract:
  A precise measurement of the total cross section and the coulomb scattering
at the LHC requires the observation of elastically scatteredparticles at
extremely small angles (14 microrad, -t < 0.01 GeV**2 for the first case; 3
microrad, -t<0.0006 GeV**2 for the second one). In this paper a very high-beta
insertion optics is presented. A feasibility study, including the acceptance of
the detectors, for an experiment to be installed in IR1 or IR5, is also
presented.


title: Results from the PHOBOS Experiment on Au+Au Collisions at RHIC

abstract:
  PHOBOS is one of four experiments studying the Au-Au interactions at RHIC.
The data collected during the first few weeks after the RHIC start-up, using
the initial configuration of the PHOBOS detector, were sufficient to obtain the
first physics results for the most central collisions of Au nuclei at the
center of mass energy of 56 and 130 AGeV. The pseudorapidity density of charged
particles near midrapidity is shown and compared with data at lower energies
and from $pp$ and $p\bar{p}$ collisions. The progress of the analysis of the
data is also presented.PHOBOS is one of four experiments studying the Au-Au
interactions at RHIC. The data collected during the first few weeks after the
RHIC start-up, using the initial configuration of the PHOBOS detector, were
sufficient to obtain the first physics results for the most central collisions
of Au nuclei at the center of mass energy of 56 and 130 AGeV. The
pseudorapidity density of charged particles near midrapidity is shown and
compared with data at lower energies and from $pp$ and $p\bar{p}$ collisions.
The progress of the analysis of the data is also presented.


title: Dark Matter and SUSY: LEP results

abstract:
  The negative outcome of searches for supersymmetry performed at LEP have been
used to derive indirect constraints on the parameters of the most plausible
supersymmetric candidates for cold dark matter, in particular for the lightest
neutralino. We review the basic ideas leading to the present lower limit on the
lightest neutralino mass of about 37 GeV, with emphasis on the underlying
assumptions.


title:
Study of Top-quark Production and Decay Vertices with LCD Fast
  Simulation

abstract:
  We report a study of top-quark reconstruction in $e^+e^- \rightarrow
t\bar{t}$ events at a 500 GeV linear collider using the LCD Fast simulator. The
initial study of top-quark anomalous couplings is also reported. The final
states of 4 jets and lepton as well as 6 jets are used. Using the 4 jets and
lepton final state, we estimate the preliminary sensitivities for form factors
at the $\gamma/Z^0 t\bar{t}$ vertex. In the 6 jets reconstruction, we show
abilities of the top-quark charge identification and the $c$-quark tagging in W
decays.


title: LCD ROOT Simulation and Analysis Tools

abstract:
  The North American Linear Collider Detector group has developed a simulation
program package based on the ROOT system. The package consists of Fast
simulation, the reconstruction of the Full simulated data, and physics analysis
utilities.


title: Measurements of Heavy Meson Lifetimes with Belle

abstract:
  Charmed and beauty meson lifetimes have been measured using data collected
with the Belle detector at KEKB.


title: Precise Measurement of the Positive Muon Anomalous Magnetic Moment

abstract:
  A precise measurement of the anomalous g value, a_mu=(g-2)/2, for the
positive muon has been made at the Brookhaven Alternating Gradient Synchrotron.
The result a_mu^+=11 659 202(14)(6) X 10^{-10} (1.3 ppm) is in good agreement
with previous measurements and has an error one third that of the combined
previous data. The current theoretical value from the standard model is
a_mu(SM)=11 659 159.6(6.7) X 10^{-10} (0.57 ppm) and a_mu(exp)-a_mu(SM)=43(16)
X 10^{-10} in which a_mu(exp) is the world average experimental value.


title:
Measurement of the CP Violation Parameter sin(2phi_1) in B^0_d Meson
  Decays

abstract:
  We present a measurement of the Standard Model CP violation parameter
sin(2phi_1) based on a 10.5 fb^{-1} data sample collected at the Upsilon(4S)
resonance with the Belle detector at the KEKB asymmetric e+e- collider. One
neutral B meson is reconstructed in the J/psi K_S, psi(2S) K_S, chi_{c1} K_S,
eta_c K_S, J/psi K_L or J/psi pi^0 CP-eigenstate decay channel and the flavor
of the accompanying B meson is identified from its charged particle decay
products. From the asymmetry in the distribution of the time interval between
the two B-meson decay points, we determine sin(2phi_1) = 0.58 +0.32-0.34 (stat)
+0.09-0.10 (syst).


title: Photon Structure

abstract:
  Measurements of di-jet production at HERA provide an important test of NLO
QCD calculations. It is also a source of information about partonic content of
the photon, complementary to the measurements in e+e- experiments. In this
article we review the status of the photon structutre studies with particular
emphasis on HERA measurements.


title: Update on the Measurement of alpha_S with a 500 GeV Linear Collider

abstract:
  An update on the prospects for the precise measurement of the strong coupling
constant alpha_S at a high energy Linear Collider via the three-jet rate is
presented. In particular, the issue of the distribution of center-of-mass
energies of the identified q-qbar event sample, which can affect the
determination of \alpha_S at the scale Q^2=(500 GeV)^2$, is addressed.


title: The final SLD results for ALR and Alepton

abstract:
  We present the final measurements of the left-right cross-section asymmetry
(ALR) for Z boson production by e+e- collisions and Z boson-lepton coupling
asymmetry parameters Ae, Amu, and Atau in leptonic Z decays with the SLD
detector at the SLAC Linear Collider. Using the complete sample of polarized Z
bosons collected at SLD, we get ALR = 0.15056 +- 0.00239, Ae = 0.1544 +-
0.0060, Amu = 0.142 +- 0.015, and Atau = 0.136 +- 0.015. The ALR=Ae and Ae
results are combined and we find Ae = 0.1516 +- 0.0021. Assuming lepton
universality, we obtain a combined effective weak mixing angle of sin 2 theta
eff W = 0.23098 +- 0.00026. Within the context of the SM, our result prefers a
light Higgs mass.


title: A study of topological vertexing for heavy quark tagging

abstract:
  We compare heavy quark tagging and anti-tagging efficiencies for vertex
detectors with different inner raddi using the topological vertex technique
developed at the SLC/SLD experiment. Charm tagging benefits by going to very
small inner radii.


title: Measurement of the Tau Branching Fractions into Leptons

abstract:
  Using data collected with the L3 detector near the Z resonance, corresponding
to an integrated luminosity of 150pb-1, the branching fractions of the tau
lepton into electron and muon are measured to be
  B(tau->e nu nu) = (17.806 +- 0.104 (stat.) +- 0.076 (syst.)) %,
  B(tau->mu nu nu) = (17.342 +- 0.110 (stat.) +- 0.067 (syst.)) %.
  From these results the ratio of the charged current coupling constants of the
muon and the electron is determined to be g_mu/g_e = 1.0007 +- 0.0051. Assuming
electron-muon universality, the Fermi constant is measured in tau lepton decays
as G_F = (1.1616 +- 0.0058) 10^{-5} GeV^{-2}. Furthermore, the coupling
constant of the strong interaction at the tau mass scale is obtained as
alpha_s(m_tau^2) = 0.322 +- 0.009 (exp.) +- 0.015 (theory).


title: Study of the e+e- -> Z gamma gamma -> q q~ gamma gamma Process at LEP

abstract:
  The process e^+e^- -> Z gamma gamma -> q q~ gamma gamma is studied in 0.5
fb-1 of data collected with the L3 detector at centre-of-mass energies between
130.1 GeV and 201.7 GeV. Cross sections are measured and found to be consistent
with the Standard Model expectations. The study of the least energetic photon
constrains the quartic gauge boson couplings to -0.008 GeV-2 < a_0/\Lambda^2 <
0.005 GeV-2 and -0.007 GeV-2 < a_c/\Lambda^2 < 0.011 GeV-2, at 95% confidence
level.


title: Total Cross Section in gamma gamma Collisions at LEP

abstract:
  The reaction e+e- -> e+e- gamma* gamma* -> e+e- hadrons for quasi-real
photons is studied using data from root(s) = 183 GeV up to 202 GeV.
  Results on the total cross sections sigma(e+e- -> e+e- hadrons) and sigma(+e-
gamma* gamma* -> e+e- hadrons) are given for the two-photon centre-of-mass
energies 5 GeV < Wgammagamma < 185 GeV.
  The total cross section of two real photons is described by a Regge
parametrisation. We observe a steeper rise with the two-photon centre-of-mass
energy as compared to the hadron-hadron and the photon-proton cross sections.
The data are also compared to the expectations of different theoretical models.


title: A New Upper Limit for the Tau-Neutrino Magnetic Moment

abstract:
  Using a prompt neutrino beam in which a nu_tau component was identified for
the first time, the nu_tau magnetic moment was measured based on a search for
an anomalous increase in the number of neutrino-electron interactions. One such
event was observed when 2.3 were expected from background processes, giving an
upper 90% confidence limit of 3.9x10^-7 Bohr magnetons.


title:
Preliminary results of the Standard Model Higgs Boson search at LEP in
  2000

abstract:
  A search for the Standard Model Higgs boson is performed using the data
collected by the four LEP experiments at center-of-mass energies between 202
GeV and 209 GeV. An average luminosity of 140 $pb^{-1}$ per experiment has been
analyzed. A 2.6 $\sigma$ excess is observed in the LEP-wide combination for a
Higgs boson mass hypothesis of around 114 GeV. All results are preliminary.


title:
Investigations of fast neutron production by 190 GeV/c muon interactions
  on different targets

abstract:
  The production of fast neutrons (1 MeV - 1 GeV) in high energy muon-nucleus
interactions is poorly understood, yet it is fundamental to the understanding
of the background in many underground experiments. The aim of the present
experiment (CERN NA55) was to measure spallation neutrons produced by 190 GeV/c
muons scattering on carbon, copper and lead targets. We have investigated the
energy spectrum and angular distribution of spallation neutrons, and we report
the result of our measurement of the neutron production differential cross
section.