title:
Measurements of the bb~ production cross section and forward backward
  asymmetry at centre-of-mass energies above the Z pole at LEP

abstract:
  The measurements of Rb = sigma(e+e- -> bb~)/sigma(e+e- -> qq~) and of the b
quark forward-backward charge asymmetry, A^b_fb, at centre-of-mass energies
above the Z pole are described. The measurement of Rb is performed at \root{s}
between 130 and 189 GeV using a b-tagging method that exploits the relatively
large decay length of b-hadrons. The measurement of A^b_fb is performed using
the large statistics event sample collected at \root{s}=189 GeV with a
lepton-tag analysis based on the selection of prompt muons and electrons. The
results at \root{s}=189 GeV are: Rb = 0.163 +/- 0.013 (stat.) +/- 0.005
(syst.), A^b_fb = 0.61 +/- 0.18 (stat.) +/- 0.09 (syst.).


title:
Search for Anomalous ZZgamma and Zgammagamma couplings in the process
  e+e- -> Zgamma at LEP

abstract:
  We search for anomalous trilinear gauge couplings in the ZZgamma and
Zgammagamma vertices using data collected with the L3 detector at LEP at a
centre-of-mass energy \sqrt{s}=189 GeV. No evidence is found and limits on
these couplings and on new physics scales are derived from the analysis of the
process e+e- -> Zgamma.


title: Search for Quark-Lepton Compositeness at Tevatron and LHC

abstract:
  We make a Monte Carlo study on compositeness of first generation quarks and
leptons using the Drell-Yan distribution in the high dielectron mass region at
the Tevatron and LHC energies. The current experimental lower limits on the
compositeness scale, \Lambda, vary from 2.5 to 6.1 TeV. In the present
analysis, we assume that there will be no deviation of the dielectron mass
spectrum from Standard Model prediction at center of mass energy 2 TeV
(Tevatron) and 14 TeV (LHC). We then find that in the LL, RR, RL and LR
chirality channels of the quark-electron currents, it is possible to extend the
lower limits on \Lambda (at 95% {CL}) to a range of 6 to 10 TeV for 2 fb^{-1}
and 9 to 19 TeV for 30 fb^{-1} of integrated luminosity at Tevatron. At LHC,
the corresponding limits extend to a range of 16 to 25 TeV for 10 fb^{-1} and
20 to 36 TeV for 100 fb^{-1} of integrated luminosity.


title: Central and Forward Inclusive Jets at the Tevatron

abstract:
  We report on a new measurement of the rapidity dependence of the inclusive
jet production cross section in pbar p collisions at sqrt(s)=1.8 TeV using 92
pb^-1 of data collected by the DZero detector at the Tevatron collider. The
differential cross sections, d^2sigma/(dEt deta), are presented as a function
of jet transverse energy (Et) in five pseudorapidity (eta) intervals, up to
|eta|=3, significantly extending previous CDF and DZero measurements beyond
|eta|=0.7. The extended range of the measurement should provide greater
discrimination among different parton distribution functions. We also discuss
previous measurements of the inclusive jet cross sections made by the two
collider experiments at central pseudorapidities up to |eta|=0.7. Finally, we
present recent measurements from the CDF and DZero experiments of the ratio of
central inclusive cross sections from two center-of-mass energies, 0.63 TeV and
1.8 TeV, as a function of jet Xt. Experimental results are compared to
next-to-leading order QCD predictions.


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

abstract:
  The reaction pp -> pf (omega omega) ps has been studied at 450 GeV/c and a
spin analysis of the omega omega channel has been performed for the first time
in central production. Evidence is found for the f2(1910) in the JPC = 2++ wave
with spin projection JZ = 2. This is the only state observed in central
production with spin projection JZ = 2. Its dPT and phi dependencies are
similar to those observed for other glueball candidates. In addition, evidence
is found for a state with JPC = 4++ consistent with the f4(2300). The f0(2000),
previously observed in the rho rho final state, is confirmed.


title:
Search for Manifestations of New Physics in Fermion-Pair Production at
  LEP

abstract:
  The measurements of hadron and lepton-pair production cross sections and
leptonic forward-backward asymmetries performed with the L3 detector at
centre-of-mass energies between 130 GeV and 189 GeV are used to search for new
physics phenomena such as: contact interactions, exchange of virtual
leptoquarks, scalar quarks and scalar neutrinos, effects of TeV strings in
models of quantum gravity with large extra dimensions and non-zero sizes of the
fermions. No evidence for these phenomena is found and new limits on their
parameters are set.


title: On the e/h Ratio of the Electromagnetic Calorimeter

abstract:
  The method of extraction of the e/h ratio for an electromagnetic compartment
of a combined calorimeter is suggested and the non-compensation was determined.
The results agree with the Monte Carlo prediction and results of the weighting
method for electromagnetic compartment of combined calorimeter. The new easy
method of a hadronic energy reconstruction for a combined calorimeter is also
suggested. The proposed methods can be used for a combined calorimeter, which
is being designed to perform energy measurement in a next-generation high
energy collider experiment like ATLAS at LHC.


title: Top Quark Mass Measurements at the Tevatron

abstract:
  The general strategy, as well as channel-specific details, applied to the
measurement of the top quark mass at the Tevatron in Run I are reviewed, and
the combination of the results obtained by the CDF and DO collaborations
presented. The accelerator and detector upgrades for Run II are described, and
expected improvements in the systematic uncertainties on the measurement
evaluated.


title: CsI(Tl) for WIMP dark matter searches

abstract:
  We report a study of CsI(Tl) scintillator to assess its applicability in
experiments to search for dark matter particles. Measurements of the mean
scintillation pulse shapes due to nuclear and electron recoils have been
performed. We find that, as with NaI(Tl), pulse shape analysis can be used to
discriminate between electron and nuclear recoils down to 4 keV. However, the
discrimination factor is typically (10-15)% better than in NaI(Tl) above 4 keV.
The quenching factor for caesium and iodine recoils was measured and found to
increase from 11% to ~17% with decreasing recoil energy from 60 to 12 keV.
Based on these results, the potential sensitivity of CsI(Tl) to dark matter
particles in the form of neutralinos was calculated. We find an improvement
over NaI(Tl) for the spin independent WIMP-nucleon interactions up to a factor
of 5 assuming comparable electron background levels in the two scintillators.


title: The process $e^+e^-\to\omega\pi^0\to\pi^0\pi^0\gamma$ up to 1.4 GeV

abstract:
  The cross section of the $e^+e^-\to\omega\pi^0\to\pi^0\pi^0\gamma$ reaction
was measured by the SND detector at VEPP-2M $e^+e^-$ collider in the energy
range from threshold up to 1.4 GeV. Results of the cross section fitting by the
sum of $\rho$, $\rho^{\prime}$ and $\rho^{\prime\prime}$ contributions are
presented.


title: Model Independent Extra-dimension signatures with ATLAS

abstract:
  The generic missing transverse energy signals at LHC for theories having
large extra dimensions are discussed. Final states of jets plus missing energy
and photons plus missing energy are simulated in the ATLAS detector. The
discovery limit of LHC and the methods to determine the parameters of the
underlying model are discussed.


title:
Search for R-parity Violation in Multilepton Final States in p-barp
  Collisions at sqrt{s}=1.8 TeV

abstract:
  The result of a search for gaugino pair production with a trilepton signature
is reinterpreted in the framework of minimal supergravity (mSUGRA) with
R-parity violation via leptonic lambda Yukawa couplings. The search used 95
pb^{-1} of p-barp collisions at sqrt{s}=1.8 TeV recorded by the D0 detector at
the Fermilab Tevatron. A large domain of the mSUGRA parameter space is excluded
for lambda_{121}, lambda_{122} > 10^{-4}.


title:
TAC Proposal for Fundamental and Applied Research: Linac-Ring Type
  Phi-Factory

abstract:
  Main parameters of linac-ring type $phi$-factory proposed as the part of the
Turkic Accelerator Complex (TAC) in the framework of ATAM Science Sity Project
are discussed. Two sets of parameters, corresponding to E=130(260) MeV for
electron linac and E=2000(1000) MeV positron ring, are considered. It is swoun
that, in principle, L=10^(34)cm^(-2)s^(-1) can be achieved, which is more than
an order exceeds the design luminosity of the DA$Phi$NE. Parameters of the FEL
based on electron linac and synchrotron radiation sources based on the positron
ring are estimated.


title:
On the Velocity of Light Signals in the Deep Underwater Neutrino
  Experiments

abstract:
  During the last few years deep underwater neutrino telescopes of a new
generation with dimensions close to 100 m or more were taken into operation.
For the correct track reconstruction and for the interpretation of light pulses
from calibration lasers one has to use the group velocity for light signals.
The difference between group velocity leads to an additional delay of about 10
ns for a distance of 100 m between light source and photjmultiplier. From the
time of the appearance of the first projects of deep underwater neutrino
telescopes in the middle of 70th this fact was never mentioned in the
literature.


title: Search for CP violation in D0 and D+ decays

abstract:
  A high statistics sample of photoproduced charm particles from the FOCUS
(E831) experiment at Fermilab has been used to search for CP violation in the
Cabibbo suppressed decay modes D+ to K-K+pi+, D0 to K-K+ and D0 to pi-pi+. We
have measured the following CP asymmetry parameters: A_CP(K-K+pi+) = +0.006 +/-
0.011 +/- 0.005, A_CP(K-K+) = -0.001 +/- 0.022 +/- 0.015 and A_CP(pi-pi+) =
+0.048 +/- 0.039 +/- 0.025 where the first error is statistical and the second
error is systematic. These asymmetries are consistent with zero with smaller
errors than previous measurements.


title: The Parton Content of the Photon

abstract:
  The structure of the photon is studied in photon-photon collisions at LEP.
New measurements have become available exploring the structure function F2g of
the photon to the lowest values of x yet, where the hadronic component of the
photon is most important. Inclusive cross sections for charged D* have been
measured as a function of their transverse momenta and are used to test the
validity of perturbative QCD in NLO in this region. The total charm quark
production cross section is extracted. For the first time the inclusive
production of D* mesons in deep inelastic electron-photon scattering has been
used to extract the charm structure function of the photon. A first sign of
beauty production in photon-photon collisions is reported.


title:
Charge Asymmetry in 1-1000 GeV Electromagnetic Showers and Possibility
  of Its Measurementnt

abstract:
  For the high energy electromagnetic showers the thickness dependence of a)
the development of electron and positron components, b) the difference between
the secondary electron and positron numbers, c) the charge asymmetry of high
energy electromagnetic showers, as well as d) the spectral distributions of the
components at the shower maxima for various energies of primary particle
energies,1 - 1000 GeV were investigated employing GEANT Monte Carlo simulation
package. Using these simulation results it is discussed the possibility of
observation and study of the charge asymmetry with the help of a magnetic
spectrometer which is important for the current and future experiments on the
detection of radiowaves produced by high energy neutrinos.


title: alpha_S Evolution from 35 GeV to 202 GeV and Flavour Independence

abstract:
  Determinations of the strong coupling constant alpha_S at centre-of-mass
energies of 192 through 202 GeV at LEP are presented. The energy evolution of
alpha_S is in agreement with the prediction of QCD. The combined investigation
of
  OPAL and JADE data in the energy range of 35 through 189 GeV yields
alpha_S(m_Z)=0.1187^{+0.0034}_{-0.0019}. The strenght of the strong coupling is
flavour independent if quark mass effects are taken into account.


title: Magnetic monopole bibliography

abstract:
  We present a bibliography compilation on magnetic monopoles updated to
include references till the end of year 1999. It is intended to contain nearly
all the experimental papers on the subject and only the theoretical papers
which have some specific experimental implications.


title: Statistical properties of the estimator using covariance matrix

abstract:
  The statistical properties of estimator using covariance matrix for the
account of point-to-point correlations due to systematic errors are analyzed.
It is shown that the covariance matrix estimator (CME) is consistent for the
realistic cases (when systematic errors on the fitted parameters are not
extremely large comparing with the statistical ones) and its dispersion is
always smaller, than the dispersion of the simplified $\chi^2$ estimator
applied to the correlated data. The CME bias is negligible for the realistic
cases if the covariance matrix is calculated during the fit iteratively using
the parameter estimator itself. Analytical formula for the covariance matrix
inversion allows to perform fast and precise calculations even for very large
data sets. All this allows for efficient use of the CME in the global fits.


title: Measurement of W-pair production in e+e- collisions at 189GeV

abstract:
  The production of W-pairs is analysed in a data sample collected by ALEPH at
a mean centre-of-mass energy of 188.6 GeV, corresponding to an integrated
luminosity of 174.2 pb^-1. Cross sections are given for different topologies of
W decays into leptons or hadrons. Combining all final states and assuming
Standard Model branching fractions, the total W-pair cross section is measured
to be 15.71 +- 0.34 (stat) +- 0.18 (syst) pb. Using also the W-pair data
samples collected by ALEPH at lower centre-of-mass energies, the decay
branching fraction of the W boson into hadrons is measured to be BR (W >
hadrons) = 66.97 +- 0.65 (stat) +- 0.32 (syst) %, allowing a determination of
the CKM matrix element |V(cs)|= 0.951 +- 0.030 (stat) +- 0.015 (syst).


title: D0-anti-D0 Mixing and Rare Decays

abstract:
  Current status of charm mixing search, lifetime difference measurement and
rare decay search are reported. The best upper limit at 95% CL for mixing is
reported from the CLEO collaboration. E791 has reported lifetime difference
measurement and results of rare decay searches. Rare decay searches of the
FOCUS collaboration are in progress and their sensitivities to branching ratios
are at the level of a few x 10^{-6}.


title: QCD studies in e+e- annihilation from 30GeV to 189GeV

abstract:
  We present results obtained from a study of the structure of hadronic events
recorded by the L3 detector at various centre-of-mass energies. The
distributions of event shape variables and the energy dependence of their mean
values are measured from 30GeV to 189GeV and compared with various QCD models.
The energy dependence of the moments of event shape variables is used to test a
power law ansatz for the non-perturbative component. We obtain a universal
value of the non-perturbative parameter alpha_0 = 0.537 +/- 0.073. From a
comparison with resummed O(alpha_s^2) QCD calculations, we determine the strong
coupling constant at each of the selected energies. The measurements
demonstrate the running of alpha_s as expected in QCD with a value of
alpha_s(m_Z) = 0.1215 +/- 0.0012 (exp) +/- 0.0061 (th).


title:
Feasibility of a Next Generation Underground Water Cherenkov Detector:
  UNO

abstract:
  The feasibility of a next generation underground water Cherenkov detector is
examined and a conceptual design (UNO) is presented. The design has a linear
detector configuration with a total volume of 650 kton which is 13 times the
total volume of the Super-Kamiokande detector. It corresponds to a 20 times
increase in fiducial volume for physics analyses. The physics goals of UNO are
to increase the sensitivity of the searches for nucleon decays about a factor
of ten and to make precision measurements of the solar and atmospheric neutrino
properties. In addition, the detection sensitivity for Supernova neutrinos will
reach as far as the Andromeda galaxy.


title: New Method for Data Treating in Polarization Measurements

abstract:
  Precise formulas are derived for the expected values $<\xi>$, $<\eta>$ and
variances $\delta \xi ^2$, $\delta \eta ^2$ of random variables $\xi$, $\eta$
describing the spin asymmetry of some reaction when a background process
contribution is negligible and appreciable, respectively. The variances of
$\xi$ and $\eta$ are proved to be finite. This property differs from that of
the Caushy distribution which has an infinite variance. It is shown that
$<\xi>$ is equal to the physical asymmetry which allows to find the asymmetry
from experimental data without studying the detector efficiency. This is the
base of the proposed method of data treating. Asymptotic formulas for $<\eta>$
and $\delta \eta ^2$ are also derived for a total number of events tending to
infinity for a finite value of the background to signal ratio.


title:
Measurement of the Relative Branching Fraction of $\Upsilon(4S)$ to
  Charged and Neutral B-Meson Pairs

abstract:
  We analyze 9.7 x 10^6 B\bar{B}$ pairs recorded with the CLEO detector to
determine the production ratio of charged to neutral B-meson pairs produced at
the Y(4S) resonance. We measure the rates for B^0 -> J/psi K^{(*)0} and B^+ ->
J/psi K^{(*)+} decays and use the world-average B-meson lifetime ratio to
extract the relative widths f+-/f00 = Gamma(Y(4S) -> B+B-)/Gamma(Y(4S) ->
B0\bar{B0}) = = 1.04 +/- 0.07(stat) +/- 0.04(syst). With the assumption that
f+- + f00 = 1, we obtain f00 = 0.49 +/- 0.02(stat) +/- 0.01(syst) and f+- =
0.51 +/- 0.02(stat) +/- 0.01(syst). This production ratio and its uncertainty
apply to all exclusive B-meson branching fractions measured at the Y(4S)
resonance.


title: Search for Lepton Flavor Violation in $K^+$ Decays

abstract:
  A search for lepton flavor violating decays, \kmmp, \keep, \kpem, \kmep and
\pizem, was performed using the data collected in E865 at the Brookhaven
Alternating Gradient Synchrotron. No signal was found in any of the decay
modes. At the 90% confidence level, the branching ratios are less than
$3.0\times10^{-9}$, $6.4\times10^{-10}$, $5.2\times10^{-10}$,
$5.0\times10^{-10}$ and $3.4\times10^{-9}$ respectively.


title: Averaging Measurements with Hidden Correlations and Asymmetric Errors

abstract:
  Properties of weighted averages are studied for the general case that the
individual measurements are subject to hidden correlations and have asymmetric
statistical as well as systematic errors. Explicit expressions are derived for
an unbiased average with a well defined error estimate.


title:
A search for charmonium states produced in central pp interactions at
  450 GeV/c

abstract:
  A search for centrally produced charmonium states has been presented. There
is no significant evidence for any charmonium production. An upper limit of 2
nb is found for the cross section of chic production using the decay chic(1P)->
J/psi gamma.


title: Heavy flavour physics results from LEP1

abstract:
  Recent heavy flavour results from the LEP experiments are presented. These
include a search for new physics in rare B decays, a new model-independent
measurement of the b-quark fragmentation function at the Z peak, updated
measurements of |Vcb|, results on DeltaGamma_s, searches for B0s oscillations,
as well as a new measurement of sin(2beta). Many combined results, obtained by
dedicated working groups are also given...


title: Moller Scattering Polarimetry for High Energy e^+e^- Linear Colliders

abstract:
  The general features of the Moller scattering and its use as an electron
polarimeter are described and studied in view of the planned future high energy
e^+e^- linear colliders. In particular the study concentrates on the TESLA
collider which is envisaged to operate with longitudinal polarised beams at a
centre of mass energy of the order of 0.5 TeV with a luminosity of about L =
10^34 cm^-2 sec^-1.


title:
Study of Charmless Hadronic B Meson Decays to Pseudoscalar-Vector Final
  States

abstract:
  We report results of searches for charmless hadronic B meson decays to
pseudoscalar(pi^+-,K^+-,Pi^0 or Ks^0)-vector(Rho, K* or Omega) final states.
Using 9.7 million BBbar pairs collected with the CLEO detector, we report first
observation of B^- --> Pi^-Rho^0, B^0 --> Pi^+-Rho^-+ and B^- --> Pi^-Omega,
which are expected to be dominated by hadronic b --> u transitions. The
measured branching fractions are (10.4+3.3-3.4+-2.1)x10^-6,
(27.6+8.4-7.4+-4.2)x10^-6 and (11.3+3.3-2.9+-1.4)x10^-6, respectively.
Branching fraction upper limits are set for all the other decay modes
investigated.


title: Structure Functions and Large Q^2 Cross Sections at HERA

abstract:
  The data collected with the H1 and ZEUS detectors during the running period
1994-99 are used to give an experimental review on the proton structure
functions and the neutral current and charged current large Q^2 cross sections
in e^\pm p scattering at HERA.


title: New Results on Vector Meson Production at HERA

abstract:
  New results on elastic (exclusive) production of vector mesons are presented,
mainly on J/\psi and phi mesons with emphasis on an interpretation of the data
within pQCD.


title:
Search for New Physics in e mu X Data at D0 Using Sleuth: A
  Quasi-Model-Independent Search Strategy for New Physics

abstract:
  We present a quasi-model-independent search for the physics responsible for
electroweak symmetry breaking. We define final states to be studied, and
construct a rule that identifies a set of relevant variables for any particular
final state. A new algorithm ("Sleuth") searches for regions of excess in those
variables and quantifies the significance of any detected excess. After
demonstrating the sensitivity of the method, we apply it to the semi-inclusive
channel e mu X collected in 108 pb^-1 of ppbar collisions at sqrt(s) = 1.8 TeV
at the D0 experiment during 1992-1996 at the Fermilab Tevatron. We find no
evidence of new high p_T physics in this sample.


title: Status of PEP-II and BaBar

abstract:
  In this report, the status of the PEP-II machine and the BaBar detector are
presented. Performance will be presented as of the Lepton Photon Conference
(August 1999) with subsequent performance levels footnoted as appropriate.


title: Measurement of exclusive omega electroproduction at HERA

abstract:
  The exclusive electroproduction of omega mesons, ep -> e omega p, has been
studied in the kinematic range 3<Q^2<20 GeV^2, 40<W<120 GeV and |t|<0.6 GeV^2
with the ZEUS detector at HERA using an integrated luminosity of 37.7 pb^{-1}.
The omega mesons were identified via the decay omega -> pi^+pi^-pi^0. The
exclusive (ep -> e omega p) cross section in the above kinematic region is
0.108 +- 0.014(stat.) +- 0.026(syst.) nb. The reaction ep -> e phi p, phi ->
pi^+pi^-pi^0, has also been measured. The cross sections, as well as the
cross-section ratios omega/rho and omega/phi, are presented as a function of W
and Q^2. Thus, for the first time, the properties of omega electroproduction
can be compared to those of rho^0, phi and J/psi electroproduction at high W.


title: Neutron production by cosmic-ray muons at shallow depth

abstract:
  The yield of neutrons produced by cosmic ray muons at a shallow depth of 32
meters of water equivalent has been measured. The Palo Verde neutrino detector,
containing 11.3 tons of Gd loaded liquid scintillator and 3.5 tons of acrylic
served as a target. The rate of one and two neutron captures was determined.
Modeling the neutron capture efficiency allowed us to deduce the total yield of
neutrons $ Y_{tot} = (3.60 \pm 0.09 \pm 0.31) \times 10^{-5}$ neutrons per muon
and g/cm$^2$. This yield is consistent with previous measurements at similar
depths.


title: Optical production and detection of dark matter candidates

abstract:
  The PVLAS collaboration is at present running, at the Laboratori Nazionali di
Legnaro of I.N.F.N., Padova, Italy, a very sensitive optical ellipsometer
capable of measuring the small rotations or ellipticities which can be acquired
by a linearly polarized laser beam propagating in vacuum through a transverse
magnetic feld (vacuum magnetic birefringence). The apparatus will also be able
to set new limits on mass and coupling constant of light scalar/pseudoscalar
particles coupling to two photons by both producing and detecting the
hypothetical particles. The axion, introduced to explain parity conservation in
strong interactions, is an example of this class of particles, all of which are
considered possible dark matter candidates. The PVLAS apparatus consists of a
very high finesse (> 140000), 6.4 m long, Fabry-Perot cavity immersed in an
intense dipolar magnetic field (~6.5 T). A linearly polarized laser beam is
frequency locked to the cavity and analysed, using a heterodyne technique, for
rotation and/or ellipticity acquired within the magnetic field.


title: Precision Physics at the LHC

abstract:
  A large number of precision measurements will be possible with the ATLAS and
CMS experiments at the CERN Large Hadron Collider (LHC). Examples from W
physics, Drell-Yan production of lepton pairs, Triple-Gauge Couplings,top
physics, Higgs and Supersymmetry are discussed.


title:
Inclusive Photoproduction of Neutral Pions in the Photon Hemisphere at
  HERA

abstract:
  The inclusive cross section for the photoproduction of neutral pions has been
measured as a function of the transverse momentum, rapidity, and Feynman x of
the pizero mesons at an average photon--proton centre-of-mass energy of 208 GeV
and for photon virtualities below Q^2=0.01 GeV^2. The pizero measurement
extends the range covered by previous charged particle measurements at HERA by
two units of rapidity in the photon direction down to a value of -5.5 in the
gamma p centre-of-mass frame. The pizero transverse momentum distribution is
well described over the whole measured range by a power law ansatz, while an
exponential fit falls below the data at transverse momentum values above 1.5
GeV/c. Good agreement with the predictions of the Monte Carlo models PYTHIA and
PHOJET is found. In the context of the PYTHIA model the data are inconsistent
with large intrinsic transverse momentum values in the photon.


title:
B->D*pi+pi-pi-pio, D(*) omega pi- and the Observation of a Wide 1- omega
  pi- Enhancement at 1418 MeV

abstract:
  We report on the observation of B->D{*}pi+pi-pi-pio decays. The branching
ratios for D*+ and D*o are (1.72+/-0.14+/-0.24)% and (1.80+/-0.24+/-0.25)%,
respectively. Each final state has a D{*} omega pi- component, with branching
ratios (0.29+/-0.03+/-0.04)% and (0.45+/-0.10+/-0.07)% for the D*+ and D*o
modes, respectively. We also observe B->D omega pi- decays. The branching
ratios for D+ and Do are (0.28+/-0.05+/-0.03)% and (0.41+/-0.07+/-0.04)%,
respectively. The omega pi- appears to come from the decay of a wide 1-
resonance. A fit to a Breit-Wigner shape gives a mass of 1418+/-26+/-19 MeV and
width of 388+/-44+/-32 MeV. We identify this object as the rho(1450) or rho'.


title:
First Direct Measurement of the Parity-Violating Coupling of the Z^0 to
  the s-Quark

abstract:
  We have made the first direct measurement of the parity-violating coupling of
the Z^0 boson to the strange quark, A_s, using ~550,000 e^+e^- ->Z^0->hadrons
events produced with a polarized electron beam and recorded by the SLD
experiment. Z^0 -> s-sbar events were tagged by the absence of B or D hadrons
and the presence in each hemisphere of a high-momentum K^+- or K^0_s. From the
polar angle distributions of the strangeness-signed thrust axis, we obtained
A_s=0.895+-0.066(stat.)+-0.062(syst.). The analyzing power and u-ubar plus
d-dbar background were constrained using the data.


title: Event Shapes and Power Corrections in e+e- Annihilation

abstract:
  The effects of the hadronisation of partons on the distribution of event
shape observables are associated with corrections which are suppressed by
reciprocal powers of the energy scale of the process. The correction is
determined by one non-calculable parameter \alpha_0 for which an universal
value of 0.5 +/- 20% is found from the investigation of the distribution of
event shape observables and their mean values measured in e^+e^- annihilation.


title: Physics Prospects with an Intense Neutrino Experiment

abstract:
  With new forthcoming intense neutrino beams, for the study of neutrino
oscillations, it is possible to consider other physics experiments that can be
done with these extreme neutrino fluxes available close to the source.


title:
Photoproduction of phi(1020) mesons on the proton at large momentum
  transfer

abstract:
  The cross section for $\phi$ meson photoproduction on the proton has been
measured for the first time up to a four-momentum transfer -t = 4 GeV^2, using
the CLAS detector at the Thomas Jefferson National Accelerator Facility. At low
four-momentum transfer, the differential cross section is well described by
Pomeron exchange. At large four-momentum transfer, above -t = 1.8 GeV^2, the
data support a model where the Pomeron is resolved into its simplest component,
two gluons, which may couple to any quark in the proton and in the $\phi$.


title: Lepton Flavour Violation at HERA

abstract:
  The $e^+p$-data collected with the ZEUS (${\cal L}=47.7$ pb$^{-1}$) and the
H1 (${\cal L}=37$ pb$^{-1}$) detectors at HERA in 1994--1997 are analysed for
signals of lepton flavour violation mediated by leptoquark exchange, both in
the muon and the tau channels. No evidence for lepton flavour violation is
found and limits on the leptoquarks' Yukawa couplings are set.


title: Study of Deep Inelastic ep-Scattering at High-Q^2 with ZEUS at HERA

abstract:
  Measurements of differential cross sections for deep inelastic ep
neutral-current (NC) and charged-current (CC) reactions are presented using
data taken during the 1994-97 e^+p and the 1998-99 e^-p running periods. The
structure function xF_3 has been extracted combining NC e^-p and e^+p data
sets. Both the measured cross sections and xF_3 are well described by the
standard model predictions using standard PDF's.


title:
Measurement of Rapidity Distribution for High Mass Drell-Yan ee Pairs at
  CDF

abstract:
  We report on the first measurement of the rapidity distribution dsigma/dy
over nearly the entire kinematic region of rapidity for e^+e^- pairs in the
Z-boson region of 66<M_{ee}<116 GeV/c^2 and at higher mass M_{ee}>116 GeV/c^2.
The data sample consists of 108 pb^{-1} of ppbar collisions at \sqrt{s}=1.8 TeV
taken by the Collider Detector at Fermilab during 1992--1995. The total cross
section in the $Z$-boson region is measured to be 252 +- 11 pb. The measured
total cross section and d\sigma/dy are compared with quantum chromodynamics
calculations in leading and higher orders.


title:
Measurements of the Mass, total Width and Two-Photon Partila Width of
  the $\eta_{c}$ Meson

abstract:
  Using 13.4 $fb^{-1}$ of data collected with the CLEO detector at the Cornell
Electron Storage Ring, we have observed 300 events for the two-photon
production of ground-state pseudo-scalar charmonium in the decay $\eta_c$ ->
$K_S K^{\mp} \pi^{\pm}$. We have measured the $\eta_c$ mass to be (2980.4 +-
2.3 (stat) +- 0.6 (sys)) MeV and its full width as (27.0 +- 5.8 (stat) +- 1.4
(sys)) MeV. We have determined the two-photon partial width of the $\eta_c$
meson to be (7.6 +- 0.8 (stat) +- 0.4 (sys) +- 2.3 (br)) keV, with the last
uncertainty associated with the decay branching fraction.


title:
Light response of pure CsI calorimeter crystals painted with
  wavelength-shifting lacquer

abstract:
  We have measured scintillation properties of pure CsI crystals used in the
shower calorimeter built for a precise determination of the pi+ -> pi0 e+ nu
decay rate at the Paul Scherrer Institute (PSI). All 240 individual crystals
painted with a special wavelength-shifting solution were examined in a
custom-build detection apparatus (RASTA=radioactive source tomography
apparatus) that uses a 137Cs radioactive gamma source, cosmic muons and a light
emitting diode as complementary probes of the scintillator light response. We
have extracted the total light output, axial light collection nonuniformities
and timing responses of the individual CsI crystals. These results predict
improved performance of the 3 pi sr PIBETA calorimeter due to the painted
lateral surfaces of 240 CsI crystals. The wavelength-shifting paint treatment
did not affect appreciably the total light output and timing resolution of our
crystal sample. The predicted energy resolution for positrons and photons in
the energy range of 10-100 MeV was nevertheless improved due to the more
favorable axial light collection probability variation. We have compared
simulated calorimeter ADC spectra due to 70 MeV positrons and photons with a
Monte Carlo calculation of an ideal detector light response.


title: Measurement of the Top Quark Mass with the Collider Detector at Fermilab

abstract:
  This report describes a measurement of the top quark mass in $\ppbar$
collisions at a center of mass energy of 1.8 TeV. The data sample was collected
with the CDF detector during the 1992--95 collider run at the Fermilab
Tevatron, and corresponds to an integrated luminosity of 106 \pb. Candidate
$t\bar{t}$ events in the ``lepton+jets'' decay channel provide our most precise
measurement of the top quark mass. For each event a top mass is determined by
using energy and momentum constraints on the production of the $\ttbar$ pair
and its subsequent decay. A likelihood fit to the distribution of reconstructed
masses in the data sample gives a top mass in the lepton+jets channel of
$176.1\pm 5.1 (stat.)\pm 5.3 (syst.) \gevcc$. Combining this result with
measurements from the ``all-hadronic'' and ``dilepton'' decay topologies yields
a top mass of $176.1\pm 6.6 \gevcc$.


title: New Evidence for Supernarrow Dibaryons Production in pd Interactions

abstract:
  The analysis of new experimental data, obtained at the Proton Linear
Accelerator of INR, with the aim to search for supernarrow dibaryons in the
$pd\to ppX_1$ and $pd\to pdX_2$ reactions is presented. Narrow peaks with an
experimental width of 5 MeV at masses of 1904$\pm 2$, 1926$\pm 2$, and 1942$\pm
2$ MeV have been observed in missing mass $M_{pX_1}$ spectra. In the missing
mass $M_{X_1}$ spectra, the peaks at $M_{X_1}=966\pm 2$, 986$\pm 2$, and
1003$\pm 2$ MeV have been found. The analysis of the data obtained leads to the
conclusion that the observed peaks in $M_{pX_1}$ spectra are most likely
supernarrow dibaryons, the decay of which into two nucleons is forbidden by the
Pauli exclusion principle. An alternative interpretation of the spectra by
assuming a decay of the supernarrow dibaryons in "exotic baryon states" with
masses $M_{X_1}$ is discussed.


title:
Linac*LHC Based ep, Gamma-p, eA, Gamma-A and FEL Gamma-A Colliders:
  Luminosity and Physics

abstract:
  Main parameters and physics goals of different colliders, which can be
realized if a special 1 TeV energy linear electron accelerator or corresponding
linear collider is constructed tangential to LHC, are discussed. It is shown
that L_(ep)=10^(32)cm^(-2)s^(-1) at sqrt(s_(ep))=5.29 TeV can be achieved
within moderate upgrade of LHC parameters. Then, Gamma-p collider with he same
luminosity and sqrt(s)=4.82 TeV can be realized using Compton backscattering of
laser beam off the electron beam. Concerning the nucleus beam,
L*A=10^(31)cm^(-2)s^(-1) can be achieved at least for light and medium nuclei
for both eA and Gamma-A options. Finally, colliding of FEL beam from an
electron linac and nucleus beam from LHC will give a new opportunity to
investigate nuclear spektroscopy and photo-nuclei reactions.


title: Status Report on the double-\beta decay experiment NEMO-3

abstract:
  The NEMO collaboration is presently mounting the NEMO-3 detector in the
Fr\'ejus Underground Laboratory. This detector, which will be completed by the
end of the year 2000, is devoted to the search of neutrinoless double beta
decay with various isotopes. Much attention has been focused on ^{100}Mo and
^{82}Se with their large Q_{\beta\beta}-values. The detector is based on the
direct detection of the two electrons by a tracking device and on the
measurement of their energies by a calorimeter. The aim of the experiment is to
have a sensitivity for the effective neutrino mass on the order of 0.1 eV. The
status and the expected performance of the NEMO-3 detector for both internal
and external background rejections and for signal detection are presented.


title: Hadronic Structure Functions of the Photon Measured at LEP

abstract:
  The measurements of hadronic structure functions of the photon based on the
reaction ee --> ee gamma^(*)(P^2) gamma^*(Q^2)--> ee hadrons are discussed.


title: Optics: general-purpose scintillator light response simulation code

abstract:
  We present the program optics that simulates the light response of an
arbitrarily shaped scintillation particle detector. Predicted light responses
of pure CsI polygonal detectors, plastic scintillator staves, cylindrical
plastic target scintillators and a Plexiglas light-distribution plate are
illustrated. We demonstrate how different bulk and surface optical properties
of a scintillator lead to specific volume and temporal light collection
probability distributions. High-statistics optics simulations are calibrated
against the detector responses measured in a custom-made cosmic muon tomography
apparatus. The presented code can also be used to track particles intersecting
complex geometrical objects.


title: GNO Solar Neutrino Observations: Results for GNOI

abstract:
  We report the first GNO solar neutrino results for the measuring period GNOI,
solar exposure time May 20, 1998 till January 12, 2000. In the present
analysis, counting results for solar runs SR1 - SR19 were used till April 4,
2000. With counting completed for all but the last 3 runs (SR17 - SR19), the
GNO I result is [65.8 +10.2 -9.6 (stat.) +3.4 -3.6 (syst.)]SNU (1sigma) or
[65.8 + 10.7 -10.2 (incl. syst.)]SNU (1sigma) with errors combined. This may be
compared to the result for Gallex(I-IV), which is [77.5 +7.6 -7.8 (incl.
syst.)] SNU (1sigma). A combined result from both GNOI and Gallex(I-IV)
together is [74.1 + 6.7 -6.8 (incl. syst.)] SNU (1sigma).


title: First results from phi -> KL KS decays with the KLOE detector

abstract:
  The KLOE experiment has collected 2.4 1/pb of integrated luminosity during
the commissioning of the DAFNE phi-factory in 1999. The performance of the
detector has been studied using phi -> KL KS decays collected during this
period, yielding also first measurements of relevant K parameters such as
masses and lifetimes. A clean Kshort -> pi+ pi- sample is used to select Klong
-> 2pi CP-violating decays and Klong -> Kshort regeneration events in the
detector material. Results on the regeneration probability in
beryllium-alluminum alloy and carbon-fiber plus aluminum composite are
presented.


title: KLOE first results on hadronic physics

abstract:
  The KLOE detector at DAFNE, the Frascati Phi-factory, has collected about 8
millions phi decays in 1999. Measurements of Phi decays into pi0, eta, eta',
f0(980), a0(980) and pi+pi-pi0 have been performed with statistical accuracy
better than previously in a single detector, as well as new decay modes. Phi
radiative decays can clarify the nature of f0 and a0 (are they 4 quark states?)
and measure the eta-eta' mixing angle. Analysis of Phi->pi+pi-pi0 allows us to
extract the possible existence of direct decay in addition to the dominant
rho-pi mode and to obtain a precise measurement of the rho parameters such as
the mass difference between the charged and neutral rho, previously never seen.


title:
BTeV - an Experiment to Measure Mixing, CP Violation, and Rare Decays of
  Beauty and Charm at the Fermilab Collider

abstract:
  We discuss the physics goals and rationale for a detector to study Beauty and
Charm decays in the forward direction at the Fermilab Tevatron Collider. We
then describe the BTeV detector which has been designed to achieve these goals
and present its physics reach based on extensive simulation. We conclude by
comparing BTeV to other experiments designed to explore similar topics.


title: Total Cross Sections

abstract:
  The measurements of the hadron-hadron total cross sections are the first
measurements performed when a new hadron accelerator opens up a new energy
region; the measurements were made as function of the incoming beam momentum or
c.m. energy and have often been repeated with improved accuracy and finer
energy spacing.


title: Novel DAQ and Trigger Methods for the KLOE experiment

abstract:
  KLOE, a new state of the art detector recently commissioned for physics
operation at DAFNE, has many innovative interesting features, especially in the
DAQ and Trigger areas. Custom electronics assert a trigger in a 2 microseconds
decision time and distributes it to the FEE with a 50 ps time resolution. Data
are read out using 10 front-end data acquisition chains and sent to a farm of
online servers through a FDDI Gigaswitch. This design of the KLOE DAQ system
allows us to manage an input data rate as high as 50 Mbyte/s, and is completely
scalable by extending the number of computers connected to the switch.


title: Measurement of the K_L -> e+ e- e+ e- Decay Rate

abstract:
  The decay rate of the neutral long-lived K meson into the e+ e- e+ e- final
state has been measured with the NA48 detector at the CERN SPS. Using data
collected in 1999, a total of 132 events has been observed with negligible
background. The total number of kaons was determined to be 5.1 x 10^10. This
observation corresponds to a preliminary branching ratio of Gamma(K_L -> e+ e-
e+ e-)/Gamma(K_L -> all) = (3.67 +- 0.32(stat) +- 0.23(sys) +- 0.08(norm)) x
10^-8, where the first error is statistical, the second systematic, and the
third error is due to the uncertainty in the normalization.


title: MSSM SUSY Searches at LEP2

abstract:
  The status of SUSY searches at LEP2 up to centre-of-mass energy of 202 GeV is
presented. Search strategies for sleptons, squarks, charginos and neutralinos
are discussed in the framework of Minimal Supersymmetric Standard Model with
R-parity conservation. With no indication for the production of these particles
new limits are set on their masses.


title: Using Multiple RISC CPUs in Parallel to Study Charm Quarks

abstract:
  We have integrated a system of 16 RISC CPUs to help reconstruct and analyze a
1.3 Terabyte data set of 400 million high energy physics interactions. These
new CPUs provided an affordable means of processing a very large data set. The
data was generated using a hadron beam and a fixed target at Fermilab
Experiment 769. Signals were recorded on tape from particles created in or
decaying near the target and passing though a magnetic spectrometer. Because
all the interactions were independent, each CPU could completely reconstruct
any interaction without reference to other CPUs. Problems of this sort are
ideal for multiple processors. In the offline reconstuction system, we used
Exabyte 8mm video tape drives with an I/O capacity of 7 Terabytes per year and
a storage capacity of 2.3 Gigabytes per tape. This reduced tape mounts to one
or two per day rather than one or two per hour as would be the case with
9-track tapes. The ETHERNET network used to link the CPUs and has an I/O
capacity of 15 Terabytes per year. The RISC CPUs came in the form of
commercially supported workstations with little memory and no graphics to
minimize cost. Each 25 MHz MIPS R3000 RISC CPU processed data 20 times faster
than 16MHz Motorola 68020 CPUs that were also used. About 8000 hours of
processing was needed to reconstruct the data set. A sample of thousands of
fully reconstructed particles containing a charm quark has been produced.


title:
An Efficient Multiprocessor Management System for Event-Parallel
  Computing

abstract:
  Performance of software using TCP/IP sockets to distribute events to UNIX
workstations is described. This simple software was written at the University
of Mississippi to control UMiss farm reconstruction of 8 billion raw events,
part of Fermilab E791's data. E791 reconstructed HEP's largest data set to
study charm physics.


title: Testing CP Conservation at KLOE

abstract:
  A proposal for maintaining CP conservation in $K_{L}^{0}$ decays is resumed,
by adding a heterodox hypothesis. One recovers a consistent picture with a
$2\pi$ $K_{L}^{0}$ decay branching ratio proportional to the vertical
$K_{L}^{0}$ displacement. This can be clearly tested at the KLOE experiment,
where important vertical $K_{L}^{0}$ displacements occur.


title:
Production of Single W Bosons at \sqrt{s}=189 GeV and Measurement of
  WWgamma Gauge Couplings

abstract:
  Single W boson production in electron-positron collisions is studied with the
L3 detector at LEP. The data sample collected at a centre-of-mass energy of
\sqrt{s} = 188.7GeV corresponds to an integrated luminosity of 176.4pb^-1.
Events with a single energetic lepton or two acoplanar hadronic jets are
selected. Within phase-space cuts, the total cross-section is measured to be
0.53 +/- 0.12 +/- 0.03 pb, consistent with the Standard Model expectation.
Including our single W boson results obtained at lower \sqrt{s}, the WWgamma
gauge couplings kappa_gamma and lambda_gamma are determined to be kappa_gamma =
0.93 +/- 0.16 +/- 0.09 and lambda_gamma = -0.31 +0.68 -0.19 +/- 0.13.


title: Determination of gamma/Z interference in e+e- annihilation at LEP

abstract:
  An S-Matrix ansatz is used to determine the mass and width of the Z boson, as
well as the contributions of gamma/Z interference and Z boson exchange to
fermion-pair production. For this purpose we use hadron and lepton-pair
production cross sections and lepton forward-backward asymmetries that have
been measured with the L3 detector at centre-of-mass energies between 87GeV and
189GeV.


title: A triple GEM detector with two dimensional readout

abstract:
  The triple GEM detector is a micropattern gas detector which consists of a
primary ionisation gap and three consecutive gas electron multiplier (GEM)
foils. A printed circuit board with readout strips detects the current induced
by the drifting electron cloud originating from the last GEM stage. Thus the
gas amplification and the signal readout are completely separated. Triple GEM
detectors are being developed as a possible technology for the inner tracking
in the LHCb experiment.
  In an earlier note we have reported first experience with such a detector in
a test beam at PSI. Here we describe the construction of an improved version
(thinner transfer gaps, segmented GEM foils, two dimensional readout). Results
from performance measurements are presented using intense hadronic beams as
well as cosmic ray data.


title:
Search for QCD Instanton-Induced Processes in Deep-Inelastic Scattering
  at HERA

abstract:
  Preliminary H1 results on dedicated searches for QCD instanton induced
processes in DIS are presented. The investigations are based on the expected
characteristics of their hadronic final state. Searches were performed in the
kinematical region x > 0.001, 0.1 < y < 0.6 and the polar angle of scattered
positron greater than 156 degrees.


title: TESLA*HERA Based gamma-p and gamma-A Colliders

abstract:
  Main parameters and physics search potential of gamma-p and gamma-A
colliders, which will be available due to constructing the TESLA linear
electron-positron collider tangentially to the HERA proton ring, are discussed.


title: Resonance Formation in Two-Photon Collisions

abstract:
  Two-photon collisions at the e$^+$e$^-$ colliders allow to investigate the
formation and the properties of resonant states in a very clean experimental
environment. A remarkable number of new results have been recently obtained
giving important contributions to meson spectroscopy and glueball searches. The
most recent results from the LEP collider at CERN and CESR at Cornell are
reviewed here.


title: High E_T photoproduction and the photon strucure

abstract:
  Dijet photoproduction results are presented from the H1 and ZEUS
collaborations and compared to next-to-leading order pQCD calculations.


title:
Study of B Decays to Charmonium States $B\to \eta_{c}K$ and $B\to
  \chi_{C0}K$

abstract:
  In a sample of $9.66\times 10^6 B\bar{B}$ pairs collected with the CLEO
detector we make the first observation of B decays to an $\eta_c$ and a kaon.
We measure branching fractions $BR(B^+\to\eta_c K^+) = (0.69 + 0.26 - 0.21 +-
0.08 +- 0.20)\times 10^{-3}$ and $BR(B^0\to\eta_c K^0) = (1.09 + 0.55 - 0.42 +-
0.12 +- 0.31)\times 10^{-3}$, where the first error is statistical, the second
is systematic and the third is from the $\eta_c$ branching fraction
uncertainty. From these we extract the $\eta_c$ decay constant in the
factorization approximation, $f_{\eta_c} = 335 +- 75$ MeV. We also search for B
decays to a $\chi_{c0}$ and a kaon. No evidence for a signal is found and we
set 90% CL upper limits: $BR(B^+\to\chi_{c0} K^+) < 4.8\times 10^{-4}$ and
$BR(B^0\to\chi_{c0} K^0) < 5.0\times 10^{-4}$.


title: The excess of positive charges and the leading particles in DIS at HERA

abstract:
  The charge of the leading particle in DIS interactions is studied with the
QCD models LEPTO, ARIADNE, RAPGAP and HERWIG. It is predicted to be
preferentially positive, as is expected from the modified quark parton model
and is studied over a wide range of x and Q^2.


title:
Searches for prompt light gravitino signatures in e+e- Collisions at
  sqrt{s}=189GeV

abstract:
  Searches for final states expected in models with light gravitinos have been
performed, including experimental topologies with multi-leptons with missing
energy, leptons and photons with missing energy, and jets and photons with
missing energy. No excess over the expectations from the Standard Model has
been observed. Limits are placed on production cross-sections in the different
experimental topologies. Additionally, combining with searches for the
anomalous production of lepton and photon pairs with missing energy, results
are interpreted in the context of minimal models of gauge mediated SUSY
breaking. Exclusion limits are established at the 95% confidence level on the
supersymmetric particle masses; m-slepton > 83 GeV and m-neutralino > 85 GeV
for tan(beta)=2, m-stau > 69 GeV, m-selectron,-smu > 88 GeV and m-neutralino >
76 GeV for tan(beta)=20.


title:
First Measurement of the Inclusive Branching Ratio of b Hadrons to phi
  Mesons in Z0 Decays

abstract:
  The inclusive production rate of phi mesons from the decay of b hadrons
produced in Z0 decays was measured to be Br(b->phi+X) =
0.0282+-0.0013(stat.)+-0.0019(syst.), using data collected by the OPAL detector
at LEP.


title:
Search for Trilinear Neutral Gauge Boson Couplings in Z-gamma production
  at sqrt(s)=189GeV at LEP

abstract:
  The data recorded at a centre-of-mass energy of 189GeV by the OPAL detector
at LEP are used to search for trilinear couplings of the neutral gauge bosons
in the process e+e- --> Z-gamma. The cross-sections are measured for
multihadronic events with an energetic isolated photon and for events with a
high energy photon accompanied by missing energy. These cross-sections and the
photon energy, polar angle and isolation angle distributions are compared to
the Standard Model predictions and to the theoretical expectations of a model
allowing for Z-gamma-Z and Z-gamma-gamma vertices. Since no significant
deviations with respect to the Standard Model expectations are found,
constraints are derived on the strength of neutral trilinear gauge couplings.


title:
Multiplicities of pizero, eta, Kzero and of charged particles in quark
  and gluon jets

abstract:
  We compared the multiplicities of pizero, eta, Kzero and of charged particles
in quark and gluon jets in 3-jet events, as measured by the OPAL experiment at
LEP. The comparisons were performed for distributions unfolded to 100% pure
quark and gluon jets, at an effective scale Qjet which took into account
topological dependences of the 3-jet environment. The ratio of particle
multiplicity in gluon jets to that in quark jets as a function of Qjet for
pizero, eta and Kzero was found to be independent of the particle species. This
is consistent with the QCD prediction that the observed enhancement in the mean
particle rate in gluon jets with respect to quark jets should be independent of
particle species. In contrast to some theoretical predictions and previous
observations, we observed no evidence for an enhancement of eta meson
production in gluon jets with respect to quark jets, beyond that observed for
charged particles. We measured the ratio of the slope of the average charged
particle multiplicity in gluon jets to that in quark jets, C, and we compared
it to a next-to-next-to-next-to leading order calculation. Our result,
C=2.27+-0.20(stat+syst),is about one standard deviation higher than the
perturbative prediction.


title:
Measurement of the Low-x Behaviour of the Photon Structure Function
  F2-gamma

abstract:
  The photon structure function F2-gamma(x,Q**2) has been measured using data
taken by the OPAL detector at centre-of-mass energies of 91Gev, 183Gev and
189Gev, in Q**2 ranges of 1.5 to 30.0 GeV**2 (LEP1), and 7.0 to 30.0 GeV**2
(LEP2), probing lower values of x than ever before. Since previous OPAL
analyses, new Monte Carlo models and new methods, such as multi-variable
unfolding, have been introduced, reducing significantly the model dependent
systematic errors in the measurement.


title:
A study of the centrally produced eta pi0 and eta pi- systems in pp
  interactions at 450 GeV/c

abstract:
  A partial wave analysis of the centrally produced eta pi0 and eta pi-
channels has been performed in pp collisions using an incident beam momentum of
450 GeV/c. Clear a0(980) and a2(1320) signals have been observed in S and D+
waves respectively. The dPT, phi and |t| distributions of these resonances are
presented.


title: New limit for nu_(e)->nu_(tau) oscillations

abstract:
  We present a calculation for a new limit on nu_(e)->nu_(tau) oscillations
based on the recent data from CHORUS experiment


title: Measurement of Direct Photon Emission in K^+ -> pi^+ pi^0 gamma Decay

abstract:
  We have performed a measurement of the K^+ -> pi^+ pi^0 gamma decay and have
observed 2 X 10^4 events. The best fit to the decay spectrum gives a branching
ratio for direct photon emission of (4.7\pm0.8\pm0.3) X 10^{-6} in the pi^+
kinetic energy region of 55 to 90 MeV and requires no component due to
interference with inner bremsstrahlung.


title: The Case for a 500 GeV e+e- Linear Collider

abstract:
  Several proposals are being developed around the world for an e+e- linear
collider with an initial center of mass energy of 500 GeV. In this paper, we
will discuss why a project of this type deserves priority as the next major
initiative in high energy physics.


title: The Measurement of Azimuthal Asymmetries in Deep Inelastic Scattering

abstract:
  The distribution of the azimuthal angle for the charged hadrons has been
studied in the hadronic centre-of-mass system for neutral current deep
inelastic positron-proton scattering at HERA. Measurements of the dependence of
the moments of this distribution on the transverse momenta of the charged
hadrons are presented. Asymmetries that can be unambiguously attributed to
perturbative QCD processes have been observed for the first time.


title: Higgs Searches at the Tevatron

abstract:
  Higgs hunting is a world-wide sport and the Tevatron is set to become the
next field of play when Run II starts in March 2001. To set the stage, we
summarize results of searches for standard and non-standard Higgs bosons by CDF
and Dzero in Run I at the Tevatron. Progress has been made in quantifying the
requirements on the Tevatron Collider and on the upgraded experiments in Run II
for extending the excellent work done at LEP. Armed with parameterizations of
expected detector performance, the Tevatron Higgs Working group has made
predictions of the sensitivity of CDF and Dzero to Higgs bosons in the Standard
Model and in its Minimal Supersymmetric extension as a function of integrated
luminosity. These predictions are presented to underscore the excitement being
generated by Run II, and to highlight the need for the highest possible
luminosity.


title: Kin: the optimal variable for CP-violation

abstract:
  We advocate the use of an optimal variable to demontrate CP violation. This
variable, named the Kin variable, provides a means to visualize graphically CP
violation, to pin point the most statistically powerful events, and to combine
several channels and experiments. For the B0->J/PSiKs channel, its use leads to
a straightforward measurement of sin(2beta).


title: Cosmic ray tests of the D0 preshower detector

abstract:
  The D0 preshower detector consists of scintillator strips with embedded
wavelength-shifting fibers, and a readout using Visible Light Photon Counters.
The response to minimum ionizing particles has been tested with cosmic ray
muons. We report results on the gain calibration and light-yield distributions.
The spatial resolution is investigated taking into account the light sharing
between strips, the effects of multiple scattering and various systematic
uncertainties. The detection efficiency and noise contamination are also
investigated.


title:
Study of the $D^+_s \to \pi^- \pi^+ \pi^+$ decay and measurement of
  $f_0$ masses and widths

abstract:
  From a sample of 848 $\pm$ 44 $D_s^+ \to \pi^- \pi^+ \pi^+$ decays, we find
$\Gamma(D_s^+ \to \pi^- \pi^+ \pi^+) / \Gamma(D_s^+ \to \phi \pi^+) =
  0.245 \pm 0.028^{+0.019}_{-0.012} $. Using a Dalitz plot analysis of this
three body decay, we find significant contributions from the channels
$\rho^0(770)\pi^+$, $\rho^0(1450)\pi^+$, $f_0(980)\pi^+$, $f_2(1270)\pi^+$, and
$f_0(1370)\pi^+$. We present also the values obtained for masses and widths of
the resonances $f_0(980)$ and $f_0(1370)$.


title:
Experimental evidence for a light and broad scalar resonance in $D^+\to
  \pi^-\pi^+\pi^+$ decay

abstract:
  From a sample of $1172 \pm 61$ $D^+ \to \pi^- \pi^+ \pi^+$ decay, we find
$\Gamma (D^+ \to \pi^- \pi^+ \pi^+) / \Gamma (D^+ \to K^- \pi^+ \pi^+) =
  0.0311 \pm 0.0018 ^{+0.0016}_{-0.0026}$. Using a coherent amplitude analysis
to fit the Dalitz plot of this decays, we find strong evidence that a scalar
resonance of mass $478^{+24}_{-23} \pm 17$ MeV/$c^2$ and width $324^{+42}_{-40}
\pm 21$ MeV/$c^2$ accounts for approximately half of all decays.


title: HiX2000: Theory Summary

abstract:
  We summarize the theoretical consensus of the HiX workshop concerning those
measurements which seem most appropriate for inclusion in the ``white paper''
being prepared to justify the proposed 12 GeV upgrade at Jefferson Lab. The
criteria for inclusion are that such measurements should be decisive, not
possible elsewhere and should answer crucial physics questions with broad
implications.


title:
Search for Direct CP Violation in Non-Leptonic Decays of Charged $\Xi$
  and $\Lambda$ Hyperons

abstract:
  A search for direct CP violation in the non-leptonic decays of hyperons has
been performed. In comparing the product of the decay parameters,
$\alpha_{\Xi}\alpha_{\Lambda}$, in terms of an asymmetry parameter,
$A_{\Xi\Lambda}$, between hyperons and anti-hyperons in the charged $\Xi \to
\Lambda \pi$ and $\Lambda \to p \pi$ decay sequence, we found no evidence of
direct CP violations. The parameter $A_{\Xi\Lambda}$ was measured to be $0.012
\pm 0.014$.


title: New results on atmospheric neutrinos from Soudan 2

abstract:
  Neutrino interactions recorded in a 5.1 fiducial kiloton-year exposure of the
Soudan-2 iron tracking calorimeter are analyzed for effects of neutrino
oscillations. Using contained single track and single shower events, we update
our measurement of the atmospheric nu_mu/nu_e ratio-of-ratios and find R = 0.68
\pm 0.11 \pm 0.06. Assuming this anomalously low R-value is the result of nu_mu
flavor disappearance via nu_mu to nu_tau oscillation, we select samples of
charged current events which offer good resolution, event-by-event, for L/Enu
reconstruction. Oscillation-weighted Monte Carlo events are fitted to these
data events using a chisq function summed over bins of log(L/E_nu). The region
allowed in the (sin^2 2\theta, \Delta m^2) plane at 90% CL is obtained using
the Feldman-Cousins procedure: 0.46 < sin^2 2\theta < 1.0 and 2.2x10^-4 <
\Delta m^2 < 2.2x10^-2 ev^2. A small but relatively energetic sample of
partially contained nu_mu events has also been isolated. Their distribution in
log(L/E_vis) relative to null oscillation Monte Carlo is compatible with nu_mu
to nu_tau oscillation scenarios within the parameter region allowed by our
contained events.


title:
Investigation of an angular distribution of protons in peripheral and
  central nucleus-nucleus collisions at the momentum of 4.2 A GeV/c

abstract:
  The experimental results on the relation between the number of events, the
angular distributions of protons and full number of protons are presented for
${}^{12}CC$-interactions at the momentum of 4.2 A GeV/c. The influence of
nuclear fragmentation process on the results is also considered. The obtai- ned
results confirm the assumption that there exist the critical phenomena among
the central collisions and it is necessary to use a percolation approa- ch for
the full description of the central collisions.


title: Precision Measurements of the W-Boson Mass

abstract:
  The Standard Model of electroweak interactions has had great success in
describing the observed data over the last three decades. The precision of
experimental measurements affords tests of the Standard Model at the quantum
loop level beyond leading order. Despite this great success it is important to
continue confronting experimental measurements with the Standard Model
predictions as any deviation would signal new physics. As a fundamental
parameter of the Standard Model, the mass of the W-boson, M_W, is of particular
importance. Aside from being an important test of the SM itself, a precision
measurement of M_W can be used to constrain the mass of the Higgs boson, M_H.
In this article we review the principal experimental techniques for determining
M_W and discuss their combination into a single precision M_W measurement,
which is then used to yield constraints on M_H. We conclude by briefly
discussing future prospects for precision measurements of the W-boson mass.


title:
Measurement of the Decay Amplitudes of B0 --> J/psi K* and B0s --> J/psi
  phi Decays

abstract:
  A full angular analysis has been performed for the pseudo-scalar to
vector-vector decays, B0 --> J/psi K* and B_s --> J/psi phi, to determine the
amplitudes for decays with parity-even longitudinal and transverse polarization
and parity-odd transverse polarization. The measurements are based on 190 B0
candidates and 40 B_s candidates collected from a data set corresponding to 89
inverse pb of pbarp collisions at root(s) = 1.8 TeV at the Fermilab Tevatron.
In both decays the decay amplitude for longitudinal polarization dominates and
the parity-odd amplitude is found to be small.


title: A Search for Excited Fermions at HERA

abstract:
  A search for excited fermions f^* of the first generation in e^+p scattering
at the collider HERA is presented using H1 data with an integrated luminosity
of 37 pb^(-1). All electroweak decays of excited fermions, f^* -> f gamma, f W,
f Z are considered and all possible final states resulting from the Z or W
hadronic decays or decays into leptons of the first two generations are taken
into account. No evidence for f^* production is found. Mass dependent exclusion
limits on cross-sections and on the ratio of coupling constants to the
compositeness scale are derived.


title:
Charged particle multiplicity near mid-rapidity in central Au+Au
  collisions at $\sqrt{s} = $ 56 and 130 AGeV

abstract:
  We present the first measurement of pseudorapidity densities of primary
charged particles near mid-rapidity in Au+Au collisions at $\sqrt{s} =$ 56 and
130 AGeV. For the most central collisions, we find the charged particle
pseudorapidity density to be $dN/d\eta |_{|\eta|<1} = 408 \pm 12 {(stat)} \pm
30 {(syst)}$ at 56 AGeV and $555 \pm 12 {(stat)} \pm 35 {(syst)}$ at 130 AGeV,
values that are higher than any previously observed in nuclear collisions.
Compared to proton-antiproton collisions, our data show an increase in the
pseudorapidity density per participant by more than 40% at the higher energy.


title: Jet Fragmentation and MLLA

abstract:
  Recent CDF results on inclusive momentum distributions and multiplicities of
particles in restricted cones around jets are compared to predictions using the
Modified Leading Log Approximation. We found that MLLA gives a very reasonable
description of jet fragmentation for a wide range of energies. Model parameters
are extracted separately from the multiplicity and from the shape of the
momentum distributions and are found to agree. The ratio of charged particle
multiplicities in gluon and quark jets measured in the context of MLLA is
compared to the model-independent result and also found to agree.


title: Structure Functions at Low x and Q2 at ZEUS

abstract:
  Using 3.9 $pb^{-1}$ of data from ep $\ra$ eX interactions recorded using the
ZEUS detector in 1997,the proton structure function, F$_2$, has been measured
in the range 0.015 GeV$^2$ $<$ Q$^2 <$ 0.65 GeV$^2$ and $6 \times 10^{-7} < x <
1 \times 10^{-3}$. The analysis is based on data taken incorporating new
detector components. Compared with the previous analysis, these components
allow improved background suppression and better control of systematic
uncertainties, extending the accessible kinematic region towards lower Q$^2$.


title:
Experimentation and Physics at a Future Electron-Positron Linear
  Collider

abstract:
  I summarise the physics opportunities and experimental challenges at future
Linear Colliders, using material from the recent ECFA/DESY workshop on the
subject as well as contributions to the series of worldwide studies. For
reasons of economy, the discussion is restricted to the European Tesla project
and to its electron-positron mode only.


title:
Two Higgs Doublet Model and Model Independent Interpretation of Neutral
  Higgs Boson Searches

abstract:
  Searches for the neutral Higgs bosons h0 and A0, are used to obtain limits on
the Type II Two Higgs Doublet Model (2HDM(II)) with no CP-violation in the
Higgs sector and no additional particles besides the five Higgs bosons. The
analysis combines approximately 170 pb-1 of data collected with the OPAL
detector at sqrt{s} ~ 189 GeV with previous runs at sqrt{s} ~ mZ and sqrt{s} ~
183 GeV. The searches are sensitive to the h0, A0 -> qq, gg, tau+tau- and h0 ->
A0A0 decay modes of the Higgs bosons. For the first time, the 2HDM(II)
parameter space is explored in a detailed scan, and new flavour independent
analyses are applied to examine regions in which the neutral Higgs bosons decay
predominantly into light quarks or gluons. Model-independent limits are also
given.


title:
First Observation of the $\Sigma_{c}^{*+}$ Baryon and a New Measurement
  of the $\Sigma_{c}^{+}$ Mass

abstract:
  Using data recorded with the CLEO II and CLEO II.V detector configurations at
the Cornell Electron Storage Rings, we report the first observation and mass
measurement of the $\Sigma_c^{*+}$ charmed baryon, and an updated measurement
of the mass of the $\Sigma_c^+$ baryon. We find
$M(\Sigma_c^{*+})-M(\Lambda_c^+)$= 231.0 +- 1.1 +- 2.0 MeV, and
$M(\Sigma_c^{+})-M(\Lambda_c^+)$= 166.4 +- 0.2 +- 0.3 MeV, where the errors are
statistical and systematic respectively.


title:
Search for Decays of B^{0} Mesons into Pairs of Leptons: B{0} ->
  e^{+}e^{-}, B^{0} -> \mu^{+}\mu^{-} and B^{0} -> e^{\pm}\mu^{\mp}

abstract:
  We search for the decays of the $B^0$ meson into $e^+e^-$, $\mu^+\mu^-$
$e^{\pm}\mu^{\mp}$ pairs in a sample of $9.7\times 10^6$ $B{\bar B}$ pairs
recorded by CLEO detector. No signal is found, and the following upper limits
on the corresponding branching fractions are established: $<8.3\times 10^{-7}$,
$<6.1\times 10^{-7}$, $< 15\times 10^{-7}$ at 90% confidence level. A new lower
limit on the Pati-Salam leptoquark mass $M_{LQ}>27$ TeV is established at 90%
confidence level.


title: "Four Ways to TeV Scale", Ankara'97 Workshop and Something Else

abstract:
  The first Part contains the invited talk given at the First International
Workshop on Linac-Ring Type ep and $gamma$p Colliders (9-11 April 1997, Ankara,
Turkey). Four known types of colliders, which may give an opportunity to
achieve TeV center of mass energies in the near future (10-15 years), are
discussed. Parameters of the linac-ring type e-p, $gamma$-p, e-nucleus and
$gamma$-nucleus machines are roughly estimated. Some speculations on TeV scale
physics are given. The physics goals of the TeV energy $gamma$-p and
$gamma$-nucleus colliders are considered. Information about the Ankara'97
Workshop, including Workshop Conclusion and Recommendations, is presented in
Part II. Finally, an Appeal to ICFA, ECFA and ACFA is presented in Part III.


title: Measurement of the W Boson Mass with the Collider Detector at Fermilab

abstract:
  We present a measurement of the W boson mass using data collected with the
CDF detector during the 1994-95 collider run at the Fermilab Tevatron. A fit to
the transverse mass spectrum of a sample of 30,115 W -> enu events recorded in
an integrated luminosity of 84 pb^(-1) gives a mass Mw = 80.473 +- 0.065(stat.)
+- 0.092(syst.) GeV/c^2. A fit to the transverse mass spectrum of a sample of
14,740 W -> munu events from 80 pb^(-1) gives a mass Mw = 80.465 +-
0.100(stat.) +- 0.103(syst.) GeV/c^2. The dominant contributions to the
systematic uncertainties are the uncertainties in the electron energy scale and
the muon momentum scale, 0.075 GeV/c^2 and 0.085 GeV/c^2, respectively. The
combined value for the electron and muon channel is Mw = 80.470 +- 0.089
GeV/c^2. When combined with previously published CDF measurements, we obtain Mw
= 80.433 +- 0.079 GeV/c^2.


title:
Studies of the Response of the Prototype CMS Hadron Calorimeter,
  Including Magnetic Field Effects, to Pion, Electron, and Muon Beams

abstract:
  We report on the response of a prototype CMS hadron calorimeter module to
charged particle beams of pions, muons, and electrons with momenta up to 375
GeV/c. The data were taken at the H2 and H4 beamlines at CERN in 1995 and 1996.
The prototype sampling calorimeter used copper absorber plates and scintillator
tiles with wavelength shifting fibers for readout. The effects of a magnetic
field of up to 3 Tesla on the response of the calorimeter to muons, electrons,
and pions are presented, and the effects of an upstream lead tungstate crystal
electromagnetic calorimeter on the linearity and energy resolution of the
combined calorimetric system to hadrons are evaluated. The results are compared
with Monte Carlo simulations and are used to optimize the choice of total
absorber depth, sampling frequency, and longitudinal readout segmentation.


title: Study of chi_{c1} and chi_{c2} meson production in B meson decays

abstract:
  Using a sample of 9.7 million B meson pairs collected with the CLEO detector,
we study inclusive B meson decays to the chi_c1 and chi_c2 charmonia states. We
measure the branching fraction for the inclusive chi_c1 production in B decays
to be Br(B->chi_c1 X)=(4.14+-0.31+-0.40)*10^-3, where the first uncertainty is
statistical and the second one is systematic. We obtain the branching fractions
for direct chi_c1 and chi_c2 production in B decays by subtracting the
contribution from the decay chain B->psi(2S)X with psi(2S)->chi_c1,2 gamma. We
measure Br(B->chi_c1[direct] X)=(3.83+-0.31+-0.40)*10^-3. No statistically
significant signal for chi_c2 production is observed in either case. We
determine the 95% C.L. upper limits to be Br(B->chi_c2 X)<2.0*10^-3,
Br(B->chi_c2[direct] X)<1.7*10^-3, and Br(B->chi_c2[direct]
X)/Br(B->chi_c1[direct] X)<0.44. All quoted results are preliminary.


title: Observation of the Omega_c Charmed Baryon at CLEO

abstract:
  The CLEO detector at the CESR collider has used 13.7 fb^{-1} to search for
the production of Omega_c (css-ground state) in e^{+}e^{-} collisions at
sqrt{s} = 10.6 GeV The modes used to study the Omega_c are Omega- pi+, Omega-
pi+ pi0, Xi- K- pi+ pi+, Xi0 K- pi+, and Omega- pi+ pi+ pi-. We observe 40.4 +-
9.0(stat) combined events at a mass of 2694.6 +- 2.6(stat) +- 2.4(syst) MeV. We
have also measured the \sigma * Br of the above modes for xp > 0.5 to be 11.3
+- 3.9 +- 2.3 fb, 47.6 +- 18.0 +- 2.8 fb, 45.1 +- 23.2 +- 4.1 fb, 18.2 +- 10.6
+- 3.8 fb, and <5.1 fb @ 90 % CL, respectively.


title: Setting Confidence Belts

abstract:
  We propose using a Bayes procedure with uniform improper prior to determine
credible belts for the mean of a Poisson distribution in the presence of
background and for the continuous problem of measuring a non-negative quantity
$\theta$ with a normally distributed measurement error. Within the Bayesian
framework, these belts are optimal. The credible limits are then examined from
a frequentist point of view and found to have good frequentist and conditional
frequentist properties.


title: Observation of New States Decaying into Lambda_c^+pi-pi+

abstract:
  Using 13.7 fb^{-1} of data recorded by the CLEO detector at CESR, we
investigate the spectrum of charmed baryons which decay into Lambda_c^+ pi^-
pi^+ and are more massive than the Lambda_{c1} baryons. We find evidence for
two new states: one is broad and has an invariant mass roughly 480 MeV above
that of the Lambda_c^+; the other is narrow with an invariant mass of 596 +- 1
+- 2 MeV above the Lambda_c^+ mass. These results are preliminary.


title: Evidence of New States Decaying into Xi_c^{prime} pi

abstract:
  Using 13.7 fb^{-1} of data recorded by the CLEO detector at CESR, we report
preliminary 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)=318.4+-1.5+-2.9 MeV, and
M(Xi_c^+ gamma pi^-)-M(Xi_c^+)=323.9+-pm1.4+-pm3.0 MeV. We interpret these new
states as the J^P = (1/2)^-1 Xi_{c1} particles, the charmed-strange analogues
of the Lambda_{c1}^+(2593).


title: First symmetry tests in polarized Z0 decays to b bbar g

abstract:
  We have made the first direct symmetry tests in the decays of polarized Z0
bosons into fully-identified b bbar g states, collected in the SLD experiment
at SLAC. We searched for evidence of parity violation at the b bbar g vertex by
studying the asymmetries in the b-quark polar- and azimuthal-angle
distributions, and for evidence of T-odd, CP-even or odd, final-state
interactions by measuring angular correlations between the three-jet plane and
the Z0 polarization. We found results consistent with Standard Model
expectations, and set 95% C.L. limits on anomalous contributions.


title: Determination of the B -> D^*+l-nu Decay Width and |V_{cb}|

abstract:
  We determine the CKM matrix element |Vcb| using a sample of 3.33 million
BBbar events in the CLEO detector at CESR. We determine the yield of
reconstructed B --> D*+ l nu decays as a function of w = v_B . v_D*, and from
this we obtain the differential decay rate d\Gamma/dw. By extrapolating the
differential decay rate to w=1, the kinematic point at which the D* is at rest
relative to the B, we extract the product |Vcb| F(1), where F(1) is the form
factor at w=1 and is predicted accurately by theory. We find |Vcb| F(1) =
0.0424 +- 0.0018(stat.) +- 0.0019(syst.). We also integrate the differential
decay rate over w to obtain B(B --> D*+ l nu) = (5.66 +- 0.29 +- 0.33)%. All
results are preliminary.


title:
The first determination of Generalized Polarizabilities of the proton by
  a Virtual Compton Scattering experiment

abstract:
  Absolute differential cross sections for the reaction (e+p -> e+p+gamma) have
been measured at a four-momentum transfer with virtuality Q^2=0.33 GeV^2 and
polarization \epsilon = 0.62 in the range 33.6 to 111.5 MeV/c for the momentum
of the outgoing photon in the photon-proton center of mass frame. The
experiment has been performed with the high resolution spectrometers at the
Mainz Microtron MAMI. From the photon angular distributions, two structure
functions which are a linear combination of the generalized polarizabilities
have been determined for the first time.


title: Study of the spatial resolution achievable with the BTeV pixel sensors

abstract:
  A Monte Carlo simulation has been developed to predict the spatial resolution
of silicon pixel detectors. The results discussed in this paper focus on the
unit cell geometry of 50 $\mu$m x 400 $\mu$m, as chosen for BTeV. Effects taken
into account include energy deposition fluctuations along the charged particle
path, diffusion, magnetic field and response of the front end electronics. We
compare our predictions with measurements from a recent test beam study
performed at Fermilab.


title:
Determination of Scanning Efficiencies in Experiments Using Nuclear
  Emulsion Sheets

abstract:
  During their exposure, nuclear emulsion sheets detect both tracks from
experiment-related particles, as well as a considerable amount of background
tracks, mainly due to cosmic rays. Unless the exposure has been fairly short,
it is therefore fairly likely that a fraction of the tracks that have been
identified as belonging to the particles the experiment is interested in, are
really due to background. A method, which allows to measure this fraction
reliably directly from the data, is described.


title: The Atmospheric Neutrino Anomaly: Muon Neutrino Disappearance

abstract:
  With the 1998 announcement of new evidence for muon neutrino disappearance
observed by the Super-Kamiokande experiment, the more than a decade old
atmospheric neutrino anomaly moved from a possible indication for neutrino
oscillations to an almost inescapable implication. The evidence from all
experiments is reviewed, and indications are presented that the oscillations
are probably between muon and tau neutrinos with nearly maximal mixing.
Implications and future directions in neutrino oscillations research are
discussed.


title: A Search for $B\to \tau\nu$

abstract:
  We report results of a search for $B\to\tau\nu$ in a sample of 9.7 million
charged $B$ meson decays. The search uses both $\pi\nu$ and $\ell\nu\bar\nu$
decay modes of the $\tau$, and demands exclusive reconstruction of the
companion $\bar B$ decay to suppress background. We set an upper limit on the
branching fraction ${\cal B}(B\to \tau\nu) < 8.4\times 10^{-4}$ at 90%
confidence level. With slight modification to the analysis we also establish
${\cal B}(B^\pm\to K^\pm\nu\bar\nu) < 2.4\times 10^{-4}$ at 90% confidence
level.


title: On the Structure of the Proton, the Photon, and Colour Singlet Exchange

abstract:
  Structure function measurements of the proton, the photon, and of colour
singlet exchange are analysed using fits based on logarithmic Q**2-dependence.
The fits reveal the x-dependencies of the hadronic structures and the
interaction dynamics as directed by the data.


title:
Search for light-to-heavy quark flavor changing neutral currents in $\nu
  _{\mu}N$ and $\bar{\nu}_{\mu}N$ scattering at the Tevatron

abstract:
  We report on a search for flavor-changing neutral-currents (FCNC) in the
production of heavy quarks in deep inelastic $\nu_{\mu}N$ and $\bar{\nu}%
_{\mu}N$ scattering by the NuTeV experiment at the Fermilab Tevatron. This
measurement, made possible by the high-purity NuTeV sign-selected beams, probes
for FCNC in heavy flavors at the quark level and is uniquely sensitive to
neutrino couplings of potential FCNC mediators. All searches are consistent
with zero, and limits on the effective mixing strengths $% | V_{uc}| ^{2}$, $|
V_{db}| ^{2}$, and $| V_{sb}| ^{2}$ are obtained.


title: Role of Group and Phase Velocity in High-Energy Neutrino Observatories

abstract:
  Kuzmichev recently showed that use of phase velocity rather than group
velocity for Cherenkov light signals and pulses from calibration lasers in
high-energy neutrino telescopes leads to errors in track reconstruction and
distance measurement. We amplify on his remarks and show that errors for four
cases of interest to AMANDA, IceCube, and RICE (radio Cherenkov detector) are
negligibly small.


title: Latest Results of the KARMEN2 Experiment

abstract:
  The neutrino experiment KARMEN at the beam stop neutrino source ISIS
investigates the oscillation channel numubar->nuebar in the appearance mode by
looking for p(nuebar,e+)n reactions. An analysis of data collected from
February 1997 through March 2000 with the KARMEN2 experimental setup reveals 11
candidate events in good agreement with the background expectation of 12.3+-0.6
events. Hence, there is no indication of an oscillation signal. A maximum
likelihood analysis of the data leads to an upper limit (at 90% confidence
level) for the mixing angle of sin^2(2theta) < 1.3x10^-3 at large Dm^2 and Dm^2
< 0.049 eV^2 for sin^2(2theta)=1. The anomaly in the time spectrum of events
induced by nue and numubar seen in the KARMEN1 data could not be confirmed with
the KARMEN2 data.


title:
New Measurements of Nucleon Structure Functions from the CCFR/NuTeV
  Collaboration

abstract:
  We report on the extraction of the structure functions F_2 and Delta xF_3 =
xF_3nu-xF_3nubar from CCFR neutrino-Fe and antineutrino-Fe differential cross
sections. The extraction is performed in a physics model independent (PMI) way.
This first measurement for Delta xF_3, which is useful in testing models of
heavy charm production, is higher than current theoretical predictions. The F_2
(PMI) values measured in neutrino and muon scattering are in good agreement
with the predictions of Next to Leading Order PDFs (using massive charm
production schemes), thus resolving the long-standing discrepancy between the
two sets of data.


title:
Search for gamma gamma decays of a Higgs boson produced in association
  with a fermion pair in e+e- collisions at LEP

abstract:
  A serach for gamma gamma decays of Higgs boson is performed in the data
sample collected at LEP with the ALEPH detector between 1991 and 1999. This
corresponds to an integrated luminosity of 672 pb-1 centre-of-mass energies
ranging from 88 to 202 GeV. The search is based on topologies arising from a
Higgs boson produced in association with a fermion pair via the Higgs-strahlung
process e+e- -> Hffbar, with ffbar = nunubar, e+e-, mu+mu-, tau+tau- or
qqbar... (CERN)


title:
Search for charged Higgs bosons in e+e- collisions at energies up to
  sqrt(s) = 189GeV

abstract:
  The data collected at centre-of-mass energies of 188.6 GeV by ALEPH at LEP,
corresponding to an integrated luminosity of 176.2 pb-1, are analysed in a
search for pair-produced charged Higgs bosons H+/-. Three analyses are employed
to select the taunutaunu, taunucs and cscs final states. No evidence for a
signal is found. Upper limits are set on the production cross section as a
function of the branching fraction BR(H+ to tau nu) and of the mass M(H+),
assuming that the sum of the branching ratios is equal to one. In the framework
of a two-Higgs-doublet model, charged Higgs bosons with masses below 65.4
GeV/c2 are excluded at 95% confidence level independently of the decay mode.


title: Event Shapes and Power Corrections in ep DIS at HERA

abstract:
  Deep-inelastic ep scattering data, taken with the H1 and ZEUS detectors at
HERA, are used to study the means and distributions of the event shape
variables thrust, jet broadening, jet mass, C-parameter and two kinds of
differential two-jet rate. The data cover a range of the four-momentum transfer
Q, taken to be the relevant energy scale, between 7 GeV and 141 GeV. The Q
dependences are compared with second-order calculations of perturbative QCD.
Power law corrections are applied to account for hadronization effects.


title: The Cleo III Ring Imaging Cherenkov Detector

abstract:
  The CLEO detector has been upgraded to include a state of the art particle
identification system, based on the Ring Imaging Cherenkov Detector (RICH)
technology, in order to take data at the upgraded CESR electron positron
collider. The expected performance is reviewed, as well as the preliminary
results from an engineering run during the first few months of operation of the
CLEO III detector.


title:
Spin Observables in Antilambda-Lambda Production from Antiproton-Proton
  Annihilation with a Transverse Inital State Polarization

abstract:
  The formalism describing the scattering of two spin-1/2 objects is reviewed
for the case of antilambda-lambda production from antiproton-proton
annihilation. It is shown that an experiment utilizing a transverse target
polarization can, in principle, completely determine the spin structure of the
reaction. Additional measurements, even those using both beam and target
polarizations, would not be sensitive to any additional spin dynamics. Thus,
the transverse target polarization allows access to the complete set of spin
observables, not just the subset upon which the literature has previously
focused. This discussion is especially relevant in light of the data collected
by PS185/3 at LEAR.


title: Event Shapes and Power Correction Results from HERA

abstract:
  Inclusive event shape variables have been measured in the Breit Frame for
neutral current deep-inelastic positron-proton scattering using the H1 and ZEUS
detectors at HERA. The variables thrust, jet broadening, C-parameter, jet mass
and two kinds of differential two-jet rate have been studied in the kinematic
range 7 < Q < 100 GeV. The Q dependence of the shape variables have been
compared with QCD applying power corrections proportional to 1/Q^p to account
for hadronisation effects. The concept of power corrections is tested by
fitting the strong coupling constant alpha_s and a non-perturbative parameter
alpha(p-1)_bar.


title: Study of ATLAS Sensitivity to FCNC TOP Quark Decay t--> Zq

abstract:
  The sensitivity of ATLAS experiment to the top-quark rare decay via flavor-
changing neutral currents t \to Zq (q represents c and u quarks) have been
studied at \sqrt{s}= 14 TeV in two decay modes:
  1. The pure leptonic decay of gauge bosons: t\bar{t} \to ZqWb \to l^{+} l^{-}
j l^{+-} nu j_{b} (l=e, mu)
  2. The leptonic decay of Z bosons and hadronic decay of W bosons t\bar{t} \to
ZqWb \to l^{+} l^{-} jjjj_{b} (l=e, mu)
  The dominant backgrounds Z-jets, Zw and t\bar{t} has been analysed. The
signal and backgrounds were generated via PYTHIA 5.7, simulated and analysed
using ATLFAST 2.14. A branching ratio for t \to Zq as low as 1.1x1-^{4} for the
leptonic mode and 2.3x10^{4} for hadronic mode could be discovered at the
5\sigma level with an integrated luminosity of 10^{5} pb^{-1}.


title: Prompt Photons in Photoproduction at HERA

abstract:
  First inclusive measurements of isolated prompt photons in photoproduction at
HERA have been made with the ZEUS detector. Cross sections are given as a
function of the pseudorapidity and the transverse energy of the photon, for
E_T^gamma > 5 GeV in the gamma-p centre-of-mass energy range 134-285 GeV.
Comparisons are made with predictions from LO Monte Carlo models and NLO QCD
calculations. For forward eta^gamma (proton direction) good agreement is found,
but in the rear direction all predictions fall below the data.


title: Rare Kaon Decay Experiments

abstract:
  The status of rare kaon decay experiments is reviewed. With the current
generation of experiments now finishing, several exciting new results are
available. New limits in the search for Lepton Flavor Violation (LFV) will be
discussed, as will new limits and measurements of the CKM matrix parameters.
The next generation of rare kaon decay experiments and their contribution to
determination of CKM parameters will also be discussed.


title: A Measurement of the b-quark Mass from Hadronic Z Decays

abstract:
  Hadronic Z decay data taken with the ALEPH detector at LEP1 are used to
measure the three-jet rate as well as moments of various event-shape variables.
The ratios of the observables obtained from b-tagged events and from an
inclusive sample are determined. The mass of the b quark is extracted from a
fit to the measured ratios using a next-to-leading order prediction including
mass effects. Taking the first moment of the y3 distribution, which is the
observable with the smallest hadronization corrections and systematic
uncertainties, the result is: mb(MZ) = [3.27+-0.22(stat)
+-0.22(exp)+-0.38(had)+-0.16(theo)] GeV/c2. The measured ratio is alternatively
employed to test the flavour independence of the strong coupling constant for b
and light quarks.


title:
The KARMEN Time Anomaly: Search for a Neutral Particle of Mass 33.9 MeV
  in Pion Decay

abstract:
  We have searched for the pion decay pi^+ --> mu^+ X, where X is a neutral
particle of mass 33.905 MeV. This process was suggested by the KARMEN
Collaboration to explain an anomaly in their observed time distribution of
neutrino induced reactions. Having measured the muon momentum spectrum of
charged pions decaying in flight, we find no evidence for this process and
place an upper limit on the branching fraction eta leq 6.0 * 10^{-10} of such a
decay at a 95% confidence level.


title: Measurements of B --> D_s^{(*)+} D^{*(*)} Branching Fractions

abstract:
  This article describes improved measurements by CLEO of the $B^0 \to D_s^+
D^{*-}$ and $B^0 \to D_s^{*+} D^{*-}$ branching fractions, and first evidence
for the decay $B^+ \to D_s^{(*)+} \bar{D}^{**0}$, where $\bar{D}^{**0}$
represents the sum of the $\bar{D}_1(2420)^0$, $\bar{D}_2^*(2460)^0$, and
$\bar{D}_1(j=1/2)^0$ L=1 charm meson states. Also reported is the first
measurement of the $D_s^{*+}$ polarization in the decay $B^0 \to D_s^{*+}
D^{*-}$. A partial reconstruction technique, employing only the fully
reconstructed $D_s^+$ and slow pion $\pi_s^-$ from the $D^{*-} \to \bar{D}^0
\pi^-_s$ decay, enhances sensitivity. The observed branching fractions are
${\mathcal B} (B^0 \to D_s^+ D^{*-}) =
  (1.10 \pm 0.18 \pm 0.10 \pm 0.28)%$, ${\mathcal B} (B^0 \to D_s^{*+} D^{*-})
=
  (1.82 \pm 0.37 \pm 0.24 \pm 0.46)%$, and ${\mathcal B} (B^+ \to D_s^{(*)+}
\bar{D}^{**0}) =
  (2.73 \pm 0.78 \pm 0.48 \pm 0.68)%$, where the first error is statistical,
the second systematic, and the third is due to the uncertainty in the $D_s^+
\to \phi \pi^+$ branching fraction. The measured $D_s^{*+}$ longitudinal
polarization, $\Gamma_L/\Gamma = (50.6 \pm 13.9 \pm 3.6)%$, is consistent with
the factorization prediction of 54%.


title: Measurement of the Bbar0 and B- Meson Lifetimes

abstract:
  The lifetimes of the Bbar0 and B- mesons are measured using a sample of about
four million hadronic Z decays collected from 1991 to 1995 with the ALEPH
detector at LEP. The data sample has been recently reprocessed, achieving a
substantial improvement in the tracking performance. Semileptonic decays of
Bbar0 and b- mesons are partially reconstructed by identifying events
containing a lepton with an associated D*+ or D0 meson. The proper time of the
B meson is estimated from the measured decay length and the momentum of the
D-lepton system. A fit to the proper time of 1880 D*+l- and 2856 D0l-
candidates yields the following results: tauBbar0 = 1.518 +- 0.053 +- 0.034 ps,
tauB = 1.648 +- 0.049 +- 0.035 ps, tauB-/tauBbar0 = 1.085 +- 0.059 +- 0.018.


title: Introduction to Superstring Theory

abstract:
  These four lectures, addressed to an audience of graduate students in
experimental high energy physics, survey some of the basic concepts in string
theory. The purpose is to convey a general sense of what string theory is and
what it has achieved. Since the characteristic scale of string theory is
expected to be close to the Planck scale, the structure of strings probably
cannot be probed directly in accelerator experiments. The most accessible
experimental implication of superstring theory is supersymmetry at or below the
TeV scale.


title:
Three-Pion Interferometry Results from Central Pb+Pb Collisions at 158 A
  GeV/c

abstract:
  Three-particle correlations have been measured for identified negative pions
from central 158 A GeV Pb+Pb collisions by the WA98 experiment at CERN. A
substantial contribution of the genuine three-body correlation has been found
as expected for a mainly chaotic and symmetric source.


title: Observation of the phi to pi+pi-pi+pi- Decay

abstract:
  Using 11.6 pb^{-1} of data collected in the energy range 0.984--1.06 GeV by
CMD-2 at VEPP-2M, the cross section of the reaction e+e- to pi+pi-pi+pi- has
been studied. For the first time an interference pattern was observed in the
energy dependence of the cross section near the phi meson. The branching ratio
of the phi to pi+pi-pi+pi- decay double suppressed by the G-parity and OZI rule
is measured Br(phi to pi+pi-pi+pi-) = (3.93 +- 1.74 +- 2.14) \cdot 10^{-6}. The
upper limits have been placed for the decays phi to pi+pi-pi+pi-pi0 and phi to
eta pi+pi-
  Br(phi to pi+pi-pi+pi-pi0) < 4.6 \cdot 10^{-6} 90% CL,
  Br(phi to eta pi+pi-) < 1.8 \cdot 10^{-5} 90% CL.


title:
Measurement of Bose-Einstein Correlations in e+e- -> W+W- at
  root(s)=189GeV

abstract:
  We investigate Bose-Einstein correlations (BEC) in W-pair production at
root(s)=189GeV using the L3 detector at LEP. We observe BEC between particles
from a single W decay in good agreement with those from a light-quark Z decay
sample. We investigate their possible existence between particles coming from
different W's. No evidence for such inter-W BEC is found.


title:
Cross Section for b Jet Production in pbar-p Collisions at sqrt(s) = 1.8
  TeV

abstract:
  Bottom quark production in pbar-p collisions at sqrt(s)=1.8 TeV is studied
with 5 inverse picobarns of data collected in 1995 by the DO detector at the
Fermilab Tevatron Collider. The differential production cross section for b
jets in the central rapidity region (|y(b)| < 1) as a function of jet
transverse energy is extracted from a muon-tagged jet sample. Within
experimental and theoretical uncertainties, DO results are found to be higher
than, but compatible with, next-to-leading-order QCD predictions.


title:
Measurement of the W+W-gamma Cross Section and Direct Limits on
  Anomalous Quartic Gauge Boson Couplings at LEP

abstract:
  The process e+e- -> W+W-gamma is analysed using the data collected with the
L3 detector at LEP at a centre-of-mass energy of 188.6GeV, corresponding to an
integrated luminosity of 176.8pb^-1. Based on a sample of 42 selected W+W-
candidates containing an isolated hard photon, the W+W-gamma cross section,
defined within phase-space cuts, is measured to be: sigma_WWgamma = 290 +/- 80
+/- 16 fb, consistent with the Standard Model expectation. Including the
process e+e- -> nu nu gamma gamma, limits are derived on anomalous
contributions to the Standard Model quartic vertices W+W- gamma gamma and W+W-Z
gamma at 95% CL: -0.043 GeV^-2 < a_0/Lambda^2 < 0.043 GeV^-2 0.08 GeV^-2 <
a_c/Lambda^2 < 0.13 GeV^-2 0.41 GeV^-2 < a_n/Lambda^2 < 0.37 GeV^-2.


title: Search for anomalous couplings in the Higgs sector at LEP

abstract:
  We search for a Higgs particle with anomalous couplings in the e+e- -> H
gamma, e+e- -> HZ and e+e- -> He+e- processes with the L3 detector at LEP. We
explore the mass range 70GeV < m_H < 170GeV using 176pb^-1 of integrated
luminosity at a center-of-mass energy of \sqrt{s} = 189GeV. The Higgs decays H
-> bb, H -> gamma gamma and H -> Z gamma are considered in the analysis. No
evidence for anomalous Higgs production is found. This is interpreted in terms
of limits on the anomalous couplings d, d_B, Delta g_1^Z and Delta kappa_gamma.
Limits on the Gamma(H -> gamma gamma) and Gamma(H -> Z gamma) partial widths in
the explored Higgs mass range are also obtained.


title:
Search for Electroweak Production of Single Top Quarks in ppbar
  Collisions

abstract:
  We present a search for electroweak production of single top quarks in the
electron+jets and muon+jets decay channels. The measurements use ~90 pb^-1 of
data from Run 1 of the Fermilab Tevatron collider, collected at 1.8 TeV with
the DZero detector between 1992 and 1995. We use events that include a tagging
muon, implying the presence of a b jet, to set an upper limit at the 95%
confidence level on the cross section for the s-channel process ppbar->tb+X of
39 pb. The upper limit for the t-channel process ppbar->tqb+X is 58 pb.


title:
Search for a Higgs Boson Decaying into Two Photons in e+e- Interactions
  at sqrt{s}=189GeV

abstract:
  A search is performed for a Higgs boson produced in association with a Z
boson and decaying into two photons, using the L3 data collected at LEP at a
centre-of-mass energy of 189 GeV. All decay modes of the Z are considered. No
signal is observed and limits on the branching fraction of the Higgs boson
decay into two photons as a function of the Higgs mass are derived assuming a
Standard Model production rate. A lower limit on the mass of a fermiophobic
Higgs is set at 94.9 GeV at 95% confidence level.


title:
Measurement of the W-Pair Production Cross Section and W-Decay Branching
  Fractions in e+e- Interactions at sqrt{s}=189GeV

abstract:
  The data collected by the L3 experiment at LEP at a centre-of-mass energy of
188.6 GeV are used to measure the W-pair production cross section and the
W-boson decay branching fractions. These data correspond to an integrated
luminosity of 176.8pb^-1. The total cross section for W-pair production,
combining all final states, is measured to be sigma_WW = 16.24 +/- 0.37(stat.)
+/- 0.22(syst.) pb. Including our data collected at lower centre-of-mass
energies, the hadronic branching fraction of the W-boson is determined to be
B(W ->qq) = [68.20 +/- 0.68 (stat.) +/- 0.33 (syst.) ] %. The results agree
with the Standard Model predictions.


title: The strong coupling and the gluon density from jets in DIS

abstract:
  The extraction of the parameters of perturbative QCD is one of the main tasks
for the HERA experiments. Studies on the structure of the hadronic final states
with jet algorithms give a direct handle on the parton density functions and
the strong coupling strength over a wide kinematic range. In this article, new
results of the H1 and ZEUS collaborations for the strong coupling and the gluon
density in the proton are presented.


title: Inclusive Hadron Production and Dijets at HERA

abstract:
  This article summarizes a talk given at the International Symposium on
Multiparticle Dynamics 1999 in Providence/USA. It provides an overview on the
variety of measurements of the hadronic final state in jet production for
deep-inelastic scattering and photoproduction at HERA.