title: Direct measurement of the phi(1020) leptonic branching ratio

abstract:
  The process e+e-->mu+mu- has been studied by SND detector at VEPP-2M e+e-
collider in the phi(1020)-resonance energy region. The measured effective phi
meson leptonic branching ratio:
B(phi->l+l-)=sqrt{B(phi->e+e-)*B(phi->mu+mu-)}=(2.89+-0.10+-0.06)*10^{-4}
agrees well with the PDG value B(phi->e+e-)=(2.91+-0.07)*10^{-4} confirming
mu-e universality. Without additional assumption of mu-e universality the
branching ratio B(phi->mu+mu-)=(2.87+-0.20+-0.14)*10^{-4} was obtained.


title: Measurement of CP-violating asymmetries in B0 decays to CP eigenstates

abstract:
  We present measurements of time-dependent CP-violating asymmetries in neutral
B decays to several CP eigenstates. The measurement uses a data sample of 23
million Upsilon(4S)-->B-anti-B decays collected by the BABAR detector at the
PEP-II asymmetric B Factory at SLAC. In this sample, we find events where one
neutral B meson is fully reconstructed in a CP eigenstate containing charmonium
and the flavor of the other neutral B meson is determined from its decay
products. The amplitude of the CP-violating asymmetry, which in the Standard
Model is proportional to sin2beta, is derived from the decay time distributions
in such events. The result is sin2beta=0.34 +/- 0.20 (stat) +/- 0.05 (syst).


title: Fiber R and D for the CMS HCAL

abstract:
  This paper documents the fiber R and D for the CMS hadron barrel calorimeter
(HCAL). The R and D includes measurements of fiber flexibility, splicing,
mirror reflectivity, relative light yield, attenuation length, radiation
effects, absolute light yield, and transverse tile uniformity. Schematics of
the hardware for each measurement are shown. These studies are done for
different diameters and kinds of multiclad fiber.


title: CMS Central Hadron Calorimeter

abstract:
  We present a description of the CMS central hadron calorimeter. We describe
the production of the 1996 CMS hadron testbeam module. We show the results of
the quality control tests of the testbeam module. We present some results of
the 1995 CMS hadron testbeam.


title: The Search for Stable, Massive, Elementary Particles

abstract:
  In this paper we review the experimental and observational searches for
stable, massive, elementary particles other than the electron and proton. The
particles may be neutral, may have unit charge or may have fractional charge.
They may interact through the strong, electromagnetic, weak or gravitational
forces or through some unknown force. The purpose of this review is to provide
a guide for future searches - what is known, what is not known, and what appear
to be the most fruitful areas for new searches. A variety of experimental and
observational methods such as accelerator experiments, cosmic ray studies,
searches for exotic particles in bulk matter and searches using astrophysical
observations is included in this review.


title: Search for neutralino pair production at sqrt(s) = 189 GeV

abstract:
  A search for pair-production of neutralinos at a LEP centre-of-mass energy of
189 GeV gave no evidence for a signal. This limits the neutralino production
cross-section and excludes regions in the parameter space of the Minimal
Supersymmetric Standard Model (MSSM).


title: New results from NA48 experiment on neutral kaon rare decays

abstract:
  Recent results by the NA48 collaboration on neutral kaons rare decays into
the pi+ pi- e+ e- final state are presented. A large CP-violating asymmetry
A(K_L)=(13.9+-2.7+-2.0)% has been observed in the K_L to pi+ pi- e+ e- decay.
The K_S to pi+ pi- e+ e- decay has been observed for the first time, showing no
such asymmetry.


title: Search for the Standard Model Higgs boson at LEP in the year 2000

abstract:
  Searches for the Standard Model Higgs boson have been performed in the data
collected by the DELPHI experiment at LEP in the year 2000 at centre-of-mass
energies between 200 and 209 GeV corresponding to a total integrated luminosity
of 224 pb^{-1}. No evidence for a Higgs signal is observed in the kinematically
accessible mass range, and a 95% CL lower mass limit of 114.3 GeV/c^2 is set,
to be compared with an expected median limit of 113.5 GeV/c^2 for these data.


title:
Double-Spin Asymmetry in the Cross Section for Exclusive rho^0
  Production in Lepton-Proton Scattering

abstract:
  Evidence for a positive longitudinal double-spin asymmetry <A_1^rho> = 0.24
+-0.11 (stat) +-0.02 (syst) in the cross section for exclusive diffractive
rho^0(770) vector meson production in polarised lepton-proton scattering was
observed by the HERMES experiment. The longitudinally polarised 27.56 GeV HERA
positron beam was scattered off a longitudinally polarised pure hydrogen gas
target. The average invariant mass of the photon-proton system has a value of
<W> = 4.9 GeV, while the average negative squared four-momentum of the virtual
photon is <Q^2> = 1.7 GeV^2. The ratio of the present result to the
corresponding spin asymmetry in inclusive deep-inelastic scattering is in
agreement with an early theoretical prediction based on the generalised vector
meson dominance model.


title:
Update of the search for supersymmetric particles in scenarios with
  Gravitino LSP and Sleptons NLSP

abstract:
  An update of the search for sleptons, neutralinos and charginos in the
context of scenarios where the lightest supersymmetric particle is the
gravitino and the next-to-lightest supersymmetric particle is a slepton, is
presented, together with the update of the search for heavy stable charged
particles in light gravitino scenarios and Minimal Supersymmetric Standard
Models. Data collected in 1999 with the DELPHI detector at centre-of-mass
energies around 192, 196, 200 and 202 GeV were analysed. No evidence for the
production of these supersymmetric particles was found. Hence, new mass limits
were derived at 95% confidence level.


title: Direct Search for Charged Higgs Bosons in Decays of Top Quarks

abstract:
  We present a search for charged Higgs bosons in decays of pair-produced top
quarks in pbar p collisions at sqrt(s) = 1.8 TeV using 62.2 pb^-1 of data
recorded by the D0 detector at the Fermilab Tevatron collider. No evidence is
found for signal, and we exclude at 95% confidence most regions of the (M
higgs, tan beta) parameter space where the decay t->H b has a branching
fraction greater than 0.36 and B(H -> tau nu) is large.


title:
Measurement of the relative branching ratio BR(\Xi_c^+ \to p^+
  K^-\pi^+)\BR(\Xi_c^+ \to \Xi^- \pi^+ \pi^+)

abstract:
  We report the observation of the Cabibbo suppressed decay \Xi_c^+ \to p
K^-\pi^+ using data collected with the FOCUS spectrometer during the 1996--97
Fermilab fixed target run. We find a \Xi_c^+ signal peak of 202\pm35 events. We
have measured the relative branching ratios BR(\Xi^+_c\to p
K^-\pi^+)/BR(\Xi^+_c\to\Xi^-\pi^+\pi^+)= 0.234 \pm 0.047 \pm 0.022 and
BR(\Xi^+_c\to p \bar{K}^*(892)^0)/BR(\Xi^+_c\to p K^-\pi^+)= 0.54 \pm 0.09 \pm
0.05 .


title:
Measurement of Trilinear Gauge Boson Couplings WWV, (V = Z,gamma) in
  e+e- Collisions at 189 GeV

abstract:
  Measurements of the trilinear gauge boson couplings WWgamma and WWZ are
presented using the data taken by DELPHI in 1998 at a centre-of-mass energy of
189 GeV and combined with DELPHI data at 183 GeV. Values are determined for
Delta(g_1^Z) and Delta(kappa_gamma), the differences of the WWZ charge coupling
and of the WWgamma dipole coupling from their Standard Model values, and for
lambda_gamma, the WWgamma quadrupole coupling. A measurement of the magnetic
dipole and electric quadrupole moment of the W is extracted from the results
for Delta(kappa_gamma) and lambda_gamma. The study uses data from the final
states jjlv, jjjj, lX, jjX and gammaX, where j represents a quark jet, l an
identified lepton and X missing four-momentum. The observations are consistent
with the predictions of the Standard Model.


title:
Measurement of dijet production in neutral current deep inelastic
  scattering at high Q**2 and determination of alpha_s

abstract:
  Dijet production has been studied in neutral current deep inelastic e+p
scattering for 470 < Q**2 < 20000 GeV**2 with the ZEUS detector at HERA using
an integrated luminosity of 38.4 pb**{-1}. Dijet differential cross sections
are presented in a kinematic region where both theoretical and experimental
uncertainties are small. Next-to-leading-order (NLO) QCD calculations describe
the measured differential cross sections well. A QCD analysis of the measured
dijet fraction as a function of Q**2 allows both a precise determination of
alpha_s(M_Z) and a test of the energy-scale dependence of the strong coupling
constant. A detailed analysis provides an improved estimate of the
uncertainties of the NLO QCD cross sections arising from the parton
distribution functions of the proton. The value of alpha_s(M_Z), as determined
from the QCD fit, is alpha_s(M_Z) = 0.1166 +- 0.0019 (stat.) {+
0.0024}_{-0.0033} (exp.)} {+ 0.0057}_{- 0.0044} (th.).


title:
Measurement of the leptoquark Yukawa couplings in e+e- collisions at
  TESLA

abstract:
  Measurement of the Yukawa couplings of the first-generation leptoquarks has
been studied for e+e- collisions at TESLA, at sqrt(s)=800 GeV. By combining
measurements from different production and decay channels, determination of
Yukawa couplings with precision on the few per-cent level is possible. TESLA
will be sensitive to very small leptoquark Yukawa couplings not accessible at
LHC, down to lambda ~ 0.05 [e]. Distinction between left-handed and
right-handed Yukawa couplings is feasible even for leptoquark masses very close
to the pair-production kinematic limit.


title: Search for the sgoldstino at sqrt(s) from 189 to 202 GeV

abstract:
  A search for the supersymmetric partner of the goldstino, the sgoldstino S,
at LEP2 is presented. The production Sgamma followed by S decay into two gluons
or into two photons was studied at 189 - 202 GeV LEP centre-of-mass energies.
No evidence for the S production was found and limits on the S mass
corresponding to different theory parameters are given.


title:
Search for Spontaneous R-parity violation at sqrt(s) = 183 GeV and 189
  GeV

abstract:
  Searches for spontaneous R-parity violating signals at sqrt(s) = 183 GeV and
sqrt(s) = 189 GeV have been performed using the 1997 and 1998 DELPHI data,
under the assumption of R-parity breaking in the third lepton family. The
expected topology for the decay of a pair of charginos into two acoplanar taus
plus missing energy was investigated and no evidence for a signal was found.
The results were used to derive a limit on the chargino mass and to constrain
the allowed domains of the MSSM parameter space.


title: A Pixel Vertex Tracker for the TESLA Detector

abstract:
  In order to fully exploit the physics potential of a e+e- linear collider,
such as TESLA, a Vertex Tracker providing high resolution track reconstruction
is required. Hybrid Silicon pixel sensors are an attractive sensor technology
option due to their read-out speed and radiation hardness, favoured in the high
rate TESLA environment, but have been so far limited by the achievable single
point space resolution. A novel layout of pixel detectors with interleaved
cells to improve their spatial resolution is introduced and the results of the
characterisation of a first set of test structures are discussed. In this note,
a conceptual design of the TESLA Vertex Tracker, based on hybrid pixel sensors
is presented


title:
Investigation of Quark-Antiquark Interaction Properties using Leading
  Particle Measurements in e+e- Annihilation

abstract:
  Measurements of heavy quark production in electron-positron collisions are
used to analyse the strong interactions between quarks and anti-quarks. A
scaling behaviour is observed in distributions of the rapidity change of D*,
B*, and B mesons. From these distributions information is obtained on the
hadron formation time, effective quark masses, and the potential between
quark-antiquark pairs. Predictions for fragmentation functions are presented.


title:
Search for heavy particles decaying into electron-positron pairs in
  p-pbar collisions

abstract:
  We present results of searches for technirho, techniomega, and Z' particles,
using the decay channels technirho, techniomega, Z' -> e+e-. The search is
based on 124.8 pb-1 of data collected by the D0 detector at the Fermilab
Tevatron during 1992-1996. In the absence of a signal, we set 95% C.L. upper
limits on the cross sections for the processes p pbar -> technirho,
techniomega, Z' -> e+e- as a function of the mass of the decaying particle. For
certain model parameters, we exclude the existence of degenerate technirho and
techniomega states with masses below about 200 GeV. We exclude a Z' with mass
below 670 GeV, assuming that it has the same couplings to fermions as the Z
boson.


title:
Precise Measurement of Dimuon Production Cross-Sections in muon neutrino
  Fe and muon antineutrino Fe Deep Inelastic Scattering at the Tevatron

abstract:
  We present measurements of the semi-inclusive cross-sections for muon
neutrino and muon antineutrino-nucleon deep inelastic scattering interactions
with two oppositely charged muons in the final state. These events dominantly
arise from production of a charm quark during the scattering process. The
measurement was obtained from the analysis of 5102 muon neutrino-induced and
1458 muon antineutrino-induced events collected with the NuTeV detector exposed
to a sign-selected beam at the Fermilab Tevatron. We also extract a
cross-section measurement from a re-analysis of 5030 muon neutrino-induced and
1060 muon antineutrino-induced vents collected from the exposure of the same
detector to a quad-triplet beam by the CCFR experiment. The results are
combined to obtain the most statistically precise measurement of
neutrino-induced dimuon production cross-sections to date. These measurements
should be of broad use to phenomenologists interested in the dynamics of charm
production, the strangeness content of the nucleon, and the CKM matrix element
Vcd.


title: Searches at HERA for Squarks in R-Parity Violating Supersymmetry

abstract:
  A search for squarks in R-parity violating supersymmetry is performed in e^+p
collisions at HERA at a centre of mass energy of 300 GeV, using H1 data
corresponding to an integrated luminosity of 37 pb^(-1). The direct production
of single squarks of any generation in positron-quark fusion via a Yukawa
coupling lambda' is considered, taking into account R-parity violating and
conserving decays of the squarks. No significant deviation from the Standard
Model expectation is found. The results are interpreted in terms of constraints
within the Minimal Supersymmetric Standard Model (MSSM), the constrained MSSM
and the minimal Supergravity model, and their sensitivity to the model
parameters is studied in detail. For a Yukawa coupling of electromagnetic
strength, squark masses below 260 GeV are excluded at 95% confidence level in a
large part of the parameter space. For a 100 times smaller coupling strength
masses up to 182 GeV are excluded.


title: Soft Hadronic Interactions

abstract:
  Recent developments in soft hadronic interactions are reviewed. Emphasis it
put on measurements of the proton structure at low x, photon structure,
diffraction and exclusive processes such as vector-meson production and their
interpretation in approaches to QCD dynamics like BFKL or CCFM.


title: Detection of Accelerator-Produced Neutrinos at a Distance of 250 km

abstract:
  The KEK to Kamioka long-baseline neutrino experiment (K2K) has begun its
investigation of neutrino oscillations suggested by atmospheric neutrino
observations. Twenty-eight neutrino events have been detected in coincidence
with the expected arrival time of the beam in the 22.5 kt fiducial volume of
Super--Kamiokande, the far detector at 250 km distance. The expectation is
37.8+3.5-3.8, derived using measurements of neutrino interactions in a near
detector and extrapolation using a beam simulation validated by a measurement
of pion kinematics after production and focusing. The background is of order
10^-3 events.


title: Time-dependent angular analyses of B decays

abstract:
  When both B0 and B0bar can decay to the same final state composed of two
vectors, the interference between them and those among three polarization
states result in intricate phenomena. In this note we derive the time and
angular distributions for general B to Va Vb processes in a form convenient for
actual analyses. We then apply them to specific examples and clarify the CP
violating parameters obtainable in the D* rho and J/\psi K* final states. The
time distributions for the D*pi final states are also discussed.


title:
Measurement of D*+/- diffractive cross sections in photoproduction at
  HERA

abstract:
  The first measurement of D*+/- meson diffractive photoproduction cross
sections has been performed with the ZEUS detector at the HERA $ep$ collider,
using an integrated luminosity of 38 pb^-1. The measurement has been performed
for photon--proton center-of-mass energies in the range 130 < W < 280 GeV and
photon virtualities Q^2 < 1 GeV^2. D*+/- mesons have been reconstructed with
p_T(D*)>2 GeV and -1.5<\eta(D*)<1.5 from the decay channel D*+ --> D^0 \pi^+_s
with D^0 --> K-\pi^+ (+c.c.). The diffractive component has been selected with
0.001<x_Pom<0.018. The measured diffractive cross section in this kinematic
range is: \sigma_(ep --> e'D*Xp') =
  0.74 +/- 0.21 (stat.)^{+0.27}_{-0.18} (syst.) +/-0.16 (p. diss.) ~nb (ZEUS
preliminary). Measured integrated and differential cross sections have been
compared to theoretical expectations.


title: Measurement of the ZZ cross-section in e+e- interactions at 183-189 GeV

abstract:
  Measurements of on-shell ZZ production are described, using data collected by
DELPHI in 1997 and 1998, at centre-of-mass energies sqrt(s) = 182.6 GeV and
188.6 GeV respectively. Results obtained in each of the final states q qbar q
qbar, mu+mu- q qbar, e+e- q qbar, nu nubar q qbar, l+l-l+l-, and nu nubar l+l-
are presented. The measured cross-sections for on-shell ZZ production via the
tree-level doubly-resonant graphs (NC02) are: sigma_{NC02}(182.6 GeV) = 0.38 +-
0.18 (stat) +- 0.04 (syst) pb, sigma_{NC02}(188.6 GeV) = 0.60 +- 0.13 (stat) +-
0.07 (syst) pb. They are consistent with the Standard Model expectations of
0.25 pb and 0.65 pb at each energy.


title:
Determination of the e+e- -> gamma gamma (gamma) cross-section at
  centre-of-mass energies ranging from 189 GeV to 202 GeV

abstract:
  A test of the QED process e+e- -> gamma gamma (gamma) is reported. The data
analysed were collected with the DELPHI detector in 1998 and 1999 at the
highest energies achieved at LEP, reaching 202 GeV in the centre-of-mass. The
total integrated luminosity amounts to 375.7 pb^{-1}. The differential and
total cross-sections for the process e+e- -> gamma gamma were measured, and
found to be in agreement with the QED prediction. 95% Confidence Level (C.L.)
lower limits on the QED cut-off parameters of Lambda+ > 330 GeV and Lambda- >
320 GeV were derived. A 95% C.L. lower bound on the mass of an excited electron
of 311 GeV/c^2 (for lambda_gamma = 1) was obtained. s-channel virtual graviton
exchange was searched for, resulting in 95% C.L. lower limits on the string
mass scale, M_S: M_S > 713 GeV/c^2 (lambda = 1) and M_S > 691 GeV/c^2 (lambda =
-1).


title:
Search for SUSY with R-parity violating LL\bar{E} couplings at sqrt(s) =
  189 GeV

abstract:
  Searches for pair production of supersymmetric particles under the assumption
that R-parity is not conserved are presented, based on data recorded by the
DELPHI detector in 1998 from e+e- collisions at a centre-of-mass energy of 189
GeV. Only one R-parity violating LL\bar{E} term (i.e. one lambda coupling),
which couples scalar leptons to leptons, is considered to be dominant at a
time. Moreover, it is assumed that the strength of the R-parity violating
couplings is such that the lifetimes can be neglected. The search for pair
production of neutralinos, charginos and sleptons has been performed for both
direct R-parity violating decays and indirect cascade decays. The results are
in agreement with Standard Model expectations, and are used to update the
constraints on the MSSM parameter values and the mass limits previously derived
at sqrt(s) = 183 GeV. The present 95% C.L. limits on supersymmetric particle
masses are: m_{\tilde{\chi}^0} > 30 GeV/c^2 and m_{\tilde{\chi}^\pm} > 94
GeV/c^2; m_{\tilde{\nu}} > 76.5 GeV/c^2 (direct and indirect decays);
m_{\tilde{\ell}_R} > 83 GeV/c^2 (indirect decay only).


title:
Search for T-violation in K^+ --> pi^0 mu^+ nu and K^+ --> mu^+ nu gamma
  Decays

abstract:
  The recent progress in search for T-violating transverse muon polarization in
the decays K^+ --> pi^0 mu^+ nu and K^+ --> mu^+ nu gamma in the on-going
experiment E246 at KEK is reported. Future prospects in polarization
measurements are also discussed.


title:
The ICARUS Experiment, A Second-Generation Proton Decay Experiment and
  Neutrino Observatory at the Gran Sasso Laboratory

abstract:
  The final phase of the ICARUS physics program requires a sensitive mass of
liquid Argon of 5000 tons or more. The T600 detector stands today as the first
living proof that such large detector can be built and that liquid Argon
imaging technology can be implemented on such large scales. After the
successful completion of a series of technical tests to be performed at the
assembly hall in Pavia, the T600 detector will be ready to be transported into
the LNGS tunnel. The operation of the T600 at the LNGS will allow us (1) to
develop the local infrastructure needed to operate our large detector (2) to
start the handling of the underground liquid argon technology (3) to study the
local background (4) to start the data taking with an initial liquid argon mass
that will reach in a 5-6 year program the multi-kton goal. The T600 is to be
considered as the first milestone on the road towards a total sensitive mass of
5000 tons: it is the first piece of the detector to be complemented by further
modules of appropriate size and dimensions, in order to reach in a most
efficient and rapid way the final design mass. In this document, we describe
the physics program that will be accomplished within the first phase of the
program.


title: Search for "large" extra dimensions at the Tevatron

abstract:
  We report on a search for extra spatial dimensions compactified at radii that
are vast compared to those of the Planck length, and even larger than the
distance corresponding to the scale of electroweak symmetry breaking. The study
is based on the suggestion that there may be only a single mass scale
appropriate to particle phenomena, this being the effective Planck scale M_S,
which also serves as the scale for electroweak symmetry breaking. The only
results that have been presented thus far from the Tevatron are based on data
for e^+e^- and \gamma\gamma production at D\O, and provide the most restrictive
lower limits to date on M_S of \approx 1 TeV.


title: Tau2000 Conference Summary

abstract:
  This is a review of some of the highlights of the 6th workshop on the physics
of the tau lepton and its neutrino. This includes the test of lepton
universality, measurement of Lorentz Structure, study of hadronic decays,
direct evidence of tau neutrino, status of neutrino oscillations, and search
for neutrinoless decays. This review concludes with a look at the prospect for
tau physics in the future.


title: A Novel Optical Package for ATLAS Pixel Detector

abstract:
  An optical package of novel design has been developed for the ATLAS pixel
detector. The package contains two VCSELs and one PIN diode to transmit and
receive optical signals. The design is based on a simple connector-type concept
and is made of radiation-hard material. Several packages have been fabricated
and show promising results.


title: Measurement of the Branching Ratio for D_s->tau nu_tau Decays

abstract:
  Using about 3.9 million hadronic Z decays from e+e- collisions recorded by
the OPAL detector at LEP at centre-of-mass energies near MZ the branching ratio
for the decay D_s -> tau nu_tau has been measured to be (7.0 +/- 2.1(stat) +/-
2.0 (syst))%. This result can be used to derive the decay constant of the D_s
meson: f(D_s) = 286 +/- 44(stat) +/- 41(syst) MeV.


title:
W pair production cross-section and W branching fractions in e+e-
  interactions at 189 GeV

abstract:
  The cross-section for the process e+e- -> W+W- has been measured with the
data sample collected by DELPHI at an average centre-of-mass energy of 189 GeV
and corresponding to an integrated luminosity of 155 pb^{-1}. Based on the 2392
events selected as WW candidates, the cross-section for the doubly resonant
process e+e- -> W+W- has been measured to be 15.83 +- 0.38 (stat) +- 0.20
(syst) pb. The branching fractions of the W decay were also measured and found
to be in good agreement with the Standard Model expectation. From these a value
of the CKM mixing matrix element |V_{cs}| = 1.001 +- 0.040 (stat) +- 0.020
(syst) was derived.


title: Limits on the Masses of Supersymmetric Particles at sqrt(s)=189 GeV

abstract:
  Searches for charginos, neutralinos and sleptons at LEP2 centre-of-mass
energies from 130 GeV to 189 GeV have been used to set lower limits on the mass
of the Lightest Supersymmetric Particle and other supersymmetric particles
within the MSSM framework. R-parity conservation has been assumed. The lightest
neutralino was found to be heavier than 32.3 GeV/c^2 independent of the m_0
value. The lightest chargino, the second-to-lightest neutralino, the
next-to-heaviest neutralino, the heaviest neutralino, the sneutrino and the
right-handed selectron were found to be heavier than 62.4 GeV/c^2, 62.4
GeV/c^2, 99.9 GeV/c^2, 116.0 GeV/c^2, 61.0 GeV/c^2, and 87.0 GeV/c^2,
respectively. These limits do not depend on m_0 or M_2 and are valid for 1 \leq
tan(beta) \leq 40, in the mu region where the lightest neutralino is the LSP.
If the sneutrino is heavier than the chargino the lightest neutralino has to be
heavier than 32.4 GeV/c^2. The effects of mixings in the third family of
sfermions on these limits are discussed. The confidence level of all limits
given is 95%.


title:
Search for R-parity violation with a Ubar Dbar Dbar coupling at
  sqrt(s)=189 GeV

abstract:
  Searches for pair production of gauginos and squarks in e+e- collisions at a
centre-of-mass energy of 189 GeV have been performed on data corresponding to
an integrated luminosity of 158 pb^{-1} collected by the DELPHI detector at
LEP. The data were analyzed under the assumption of non-conservation of
R-parity through a single dominant Ubar Dbar Dbar coupling between squarks and
quarks. Typical final states contain between 4 and 10 jets with or without
additional leptons. No excess of data above Standard Model expectations was
observed. The results were used to constrain domains of the MSSM parameter
space and derive limits on the masses of supersymmetric particles. The
following mass limits at 95% CL were obtained from these searches:
  neutralino mass: m_{\tilde{\chi^0_{1}}} \geq 32 GeV
  chargino mass: m_{\tilde{\chi^+_{1}}} \geq 94 GeV
  stop and sbottom mass (indirect decay) with \Delta M > 5 GeV:
  m_{\tilde{t_1}} \geq 74 GeV, for \Phi_{mix}=0 rad
  m_{\tilde{t_1}} \geq 59 GeV, for \Phi_{mix}=0.98 rad
  m_{\tilde{b_1}} \geq 72 GeV, for \Phi_{mix}=0 rad.
  The angle \phi_{mix} is the mixing angle between left and right handed
quarks.


title: B Mixing

abstract:
  The neutral $B$ mesons, $B^0$ and $B_s$, can oscillate between their particle
and antiparticle states owing to flavor-changing weak interactions. In recent
years, techniques to detect these oscillations as a function of the meson's
decay time have been developed. In this article the physics of flavor
oscillations is reviewed and theoretical predictions are summarized. The many
observations that demonstrate the time-dependence of $B^0-\B0bar$ oscillations
are presented along with a combined measurement of its frequency, $\delta m_d$.
The attempts to measure the $B_s$ oscillation frequency, both directly and
indirectly, are then summarized. Finally, values for the CKM elements
$|V_{td}|$ and $|V_{ts}/V_{td}|$ are extracted.


title:
Inclusive production of $\rho^{0}(770), f_0(980)$ and $f_2(1270)$ mesons
  in $\nu_{\mu}$ charged current interactions

abstract:
  The inclusive production of the meson resonances $\rho^{0}(770)$, $f_0(980)$
and $f_2(1270)$ in neutrino-nucleus charged current interactions has been
studied with the NOMAD detector exposed to the wide band neutrino beam
generated by 450 GeV protons at the CERN SPS. For the first time the
$f_{0}(980)$ meson is observed in neutrino interactions. The statistical
significance of its observation is 6 standard deviations. The presence of
$f_{2}(1270)$ in neutrino interactions is reliably established. The average
multiplicity of these three resonances is measured as a function of several
kinematic variables. The experimental results are compared to the
multiplicities obtained from a simulation based on the Lund model. In addition,
the average multiplicity of $\rho^{0}(770)$ in antineutrino - nucleus
interactions is measured.


title: Colour Reconnection in W Decays

abstract:
  The studies of colour reconnection in e+e- -> WW -> 4 jets events at LEP are
reviewed. It is shown that the analysis of the particle- and energy flow
between jets is sensitive to realistic model predictions. The effects on the W
mass measurement are discussed.


title: Non-linear energy calibration of CMS calorimeters for single pions

abstract:
  CMS calorimeter energy calibration was done in the full CMS simulated
geometry for the pseudorapidity region eta = 0. The samples of single pion
events were generated with a set of incident energies from 10 GeV to 3 TeV. The
analysis of the simulated data shows that standard calibration using just
sampling coefficients for calorimeter parts with different sampling ratio gives
nonlinear calorimeter response.
  Non-linear calibration technique was applied for improving calorimeter energy
resolution and restoring the calorimeter linearity.


title: Inclusive Sigma- and Lambda(1520) production in hadronic Z decays

abstract:
  Production of Sigma- and Lambda(1520) in hadronic Z decays has been measured
using the DELPHI detector at LEP. The Sigma- is directly reconstructed as a
charged track in the DELPHI microvertex detector and is identified by its Sigma
-> n pi decay leading to a kink between the Sigma- and pi-track. The
reconstruction of the Lambda(1520) resonance relies strongly on the particle
identification capabilities of the barrel Ring Imaging Cherenkov detector and
on the ionisation loss measurement of the TPC. Inclusive production spectra are
measured for both particles. The production rates are measured to be
  <N_{Sigma-}/N_{Z}^{had}> = 0.081 +/- 0.002 +/- 0.010,
  <N_{Lambda(1520)}/N_{Z}^{had}> = 0.029 +/- 0.005 +/- 0.005.
  The production rate of the Lambda(1520) suggests that a large fraction of the
stable baryons descend from orbitally excited baryonic states. It is shown that
the baryon production rates in Z decays follow a universal phenomenological law
related to isospin, strangeness and mass of the particles.


title: First Observation of B -> D(*) rho', rho' -> omega pi-

abstract:
  We report on the observation of B-> D(*) pi+ pi- pi- pi^o decays. The
branching ratios for D*+ and D*o are (1.72+/-0.14+/-0.24)% and
(1.80+/-0.24+/-0.27)%, 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+/-0.04)% and (0.41+/-0.07+/-0.06)%, respectively. A spin parity
analysis of the D omega pi- final state prefers a wide 1^- resonance. A fit to
the omega pi- mass spectrum finds a central mass of (1349+/-25^{+10}_{-5}) MeV
and width of (547+/-86^{+46}_{-45}) MeV. We identify this object as the
rho(1450) or the \rho'.


title:
Hadronization properties of b quarks compared to light quarks in e+e- ->
  q qbar from 183 to 200 GeV

abstract:
  The DELPHI detector at LEP has collected 54 pb^{-1} of data at a
centre-of-mass energy around 183 GeV during 1997, 158 pb^{-1} around 189 GeV
during 1998, and 187 pb^{-1} between 192 and 200 GeV during 1999. These data
were used to measure the average charged particle multiplicity in e+e- -> b
bbar events, <n>_{bb}, and the difference delta_{bl} between <n>_{bb} and the
multiplicity, <n>_{ll}, in generic light quark (u,d,s) events: delta_{bl}(183
GeV) = 4.55 +/- 1.31 (stat) +/- 0.73 (syst) delta_{bl}(189 GeV) = 4.43 +/- 0.85
(stat) +/- 0.61 (syst) delta_{bl}(200 GeV) = 3.39 +/- 0.89 (stat) +/- 1.01
(syst). This result is consistent with QCD predictions, while it is
inconsistent with calculations assuming that the multiplicity accompanying the
decay of a heavy quark is independent of the mass of the quark itself.


title:
Prospects of measuring gluon fusion and weak boson fusion cross sections
  at the LHC with CMS (diploma thesis)

abstract:
  The possibility to observe a Higgs boson having a mass between 300 and 600
GeV and to measure its couplings to vector bosons and top quark with CMS at the
LHC is studied. Six different signatures are analyzed. The possibility to
separate the Higgs events produced through weak boson fusion from the Higgs
produced through gluon fusion using the forward going jets emitted in the weak
boson fusion process is discussed for each of these different channels. The
results are then used to determine the possible statistical errors on the ratio
between the two Higgs decay branching fractions when it decays into Ws and into
Zs and the possible statistical errors on the weak boson fusion and gluon
fusion cross sections after one year of LHC running.


title: Superbunch Hadron Colliders

abstract:
  A novel concept of a high luminosity hadron collider is proposed. This would
be a typical application of an induction synchrotron being newly developed.
Extremely long bunches, referred to as superbunches, are generated by a multi-
bunch stacking method employing barrier buckets at the injection into the
collider, and are accelerated to the collider energy with an step-voltage
induced in the induction gaps. Superbunches intersect with each other, yielding
a luminosity of more than $10^{35} /cm^2/sec$. A combination of vertical
crossing and horizontal crossing can be used in order to avoid any significant
beam-beam tune shift.


title:
Measurement and Interpretation of Fermion-Pair Production at LEP
  Energies of 183 and 189 GeV

abstract:
  An analysis of the data collected in 1997 and 1998 with the DELPHI detector
at e+e- collision energies close to 183 and 189 GeV was performed in order to
extract the hadronic and leptonic fermion-pair cross-sections, as well as the
leptonic forward-backward asymmetries and angular distributions. The data are
used to put limit on contact interactions between fermions, the exchange of
R-parity violating SUSY sneutrinos, Z' bosons and the existence of gravity in
extra dimensions.


title:
Search for supersymmetric particles in scenarios with a gravitino LSP
  and stau NLSP

abstract:
  Sleptons, neutralinos and charginos were searched for in the context of
scenarios where the lightest supersymmetric particle is the gravitino. It was
assumed that the stau is the next-to-lightest supersymmetric particle. Data
collected with the DELPHI detector at a centre-of-mass energy near 189 GeV were
analysed combining the methods developed in previous searches at lower
energies. No evidence for the production of these supersymmetric particles was
found. Hence, limits were derived at 95% confidence level.


title: Transition to the region of central collisions

abstract:
  The experimental results on the behaviour of the characteristics of secondary
particles depending on the disintegration degree of nuclei are used to
determine the region of central collisions. It was therefore possible that : -
the correlation between the prosesses of total disintegration of nuclei and the
central collisions of nuclei had been shown; - the existence of the regime
change points in the behaviour of the considered characteristics of secondary
particles depending on the disintegration degree of nuclei had been observed in
the other earlier experiments as well. The number of all protons in
12CC-interactions at the momentum of 4.2 A GeV/c obtained from the 2-m propane
bubble chamber exposed at the Dubna machine is considered as a disintegration
degree of nuclei. The experimental results demonstrate that there are cases
corresponding to the critical phenomena among the events with the central
collisions of nuclei. For 12CC-interaction the behaviour of the number of the
events, depending on Q also depends on the number of fragments and has a
two-steps form. This result could be explained by the existence of nuclear
clusters. The experimental results on the relation between the number of
events, the angular distributions of protons and full number of protons are
presented for 12CC-interactions at the momentum of 4.2 A GeV/c. The influence
of nuclear fragmentation process on the results is also considered. The
obtained results confirm the assumption that there exist the critical phenomena
among the central collisions and it is necessary to use a percolation approach
for the full description of the central collisions.


title: A High-Pt Trigger for the HERA-B Experiment

abstract:
  We have constructed a high-$p_T$ trigger for the HERA-B experiment at DESY.
The HERA-B experiment produces B mesons by inserting wire targets into the halo
of the proton beam circulating in HERA. The high-\pt trigger records events
that contain tracks that have high transverse momentum with respect to the
beam. Such a trigger is efficient for recording $B \to \pi^+\pi^-$, $B \to
K^-\pi^+$, $B_s \to K^+ K^-$, $B_s \to D_s^-\pi^+$, and other topical hadronic
B decays. These decays provide sensitivity to the internal angles $\alpha$ and
$\gamma$ of the CKM unitarity triangle, and they also can be used to measure or
constrain the $B_s$-$\bar B_s$ mixing parameter $x_s$.


title: Search for the Standard Model Higgs Boson in OPAL

abstract:
  A search for the Standard Model Higgs boson with the OPAL detector at LEP was
reported. The analysis was based on the full data sample collected at
center-of-mass energies of 192-209 GeV in 1999 and 2000, corresponding to an
integrated luminosity of approximately 426 /pb. The data shows an excess in a
range of 95-120 GeV. The data slightly favour the hypothesis that a signal is
present, but also that the data are consistent with the background hypothesis.
A lower bound of 109.7 GeV is obtained on the Higgs boson mass at the 95%
confidence level.


title:
Improved Measurement of the $\bar d / \bar u$ Asymmetry in the Nucleon
  Sea

abstract:
  Measurements of the ratio of Drell-Yan yields from an 800 \rm{GeV/c} proton
beam incident on liquid hydrogen and deuterium targets are reported.
Approximately 360,000 Drell-Yan muon pairs remained after all cuts on the data.
  From these data, the ratio of anti-down ($\bar{d}$) to anti-up ($\bar{u}$)
quark distributions in the proton sea is determined over a wide range in
Bjorken-$x$. These results confirm previous measurements by E866 and extend
them to lower $x$. From these data, $(\bar{d}-\bar{u})$ and
$\int(\bar{d}-\bar{u})dx$ are evaluated for $0.015<x<0.35$. These results are
compared with parameterizations of various parton distribution functions,
models and experimental results from NA51, NMC, and HERMES.


title:
Charged and Identified Particles in the Hadronic Decay of W Bosons and
  in e+e- -> q qbar from 130 to 200 GeV

abstract:
  Inclusive distributions of charged particles in hadronic W decays are
experimentally investigated using the statistics collected by the DELPHI
experiment at LEP during 1997, 1998 and 1999, at centre-of-mass energies from
183 to around 200 GeV. The possible effects of interconnection between the
hadronic decays of two Ws are not observed. Measurements of the average
multiplicity for charged and identified particles in q qbar and WW events at
centre-of-mass energies from 130 to 200 GeV and in W decays are presented. The
results on the average multiplicity of identified particles and on the position
xi^* of the maximum of the xi_p = -log(2p/sqrt(s)) distribution are compared
with predictions of JETSET and MLLA calculations.


title:
Solar 8B and hep Neutrino Measurements from 1258 Days of
  Super-Kamiokande Data

abstract:
  Solar neutrino measurements from 1258 days of data from the Super-Kamiokande
detector are presented. The measurements are based on recoil electrons in the
energy range 5.0-20.0MeV. The measured solar neutrino flux is 2.32 +-
0.03(stat.) +0.08-0.07(sys.)*10^6cm^{-2}s^{-1}, which is
45.1+-0.5(stat.)+1.6-1.4(sys.)% of that predicted by the BP2000 SSM. The day vs
night flux asymmetry is 0.033+-0.022(stat.)+0.013-0.012(sys.). The recoil
electron energy spectrum is consistent with no spectral distortion
(\chi^2/d.o.f. = 19.0/18). The seasonal variation of the flux is consistent
with that expected from the eccentricity of the Earth's orbit (\chi^2/d.o.f. =
3.7/7). For the hep neutrino flux, we set a 90% C.L. upper limit of 40
*10^3cm^{-2}s^{-1}, which is 4.3 times the BP2000 SSM prediction.


title:
Constraints on Neutrino Oscillations Using 1258 Days of Super-Kamiokande
  Solar Neutrino Data

abstract:
  We report the result of a search for neutrino oscillations using precise
measurements of the recoil electron energy spectrum and zenith angle variations
of the solar neutrino flux from 1258 days of neutrino-electron scattering data
in Super-Kamiokande. The absence of significant zenith angle variation and
spectrum distortion places strong constraints on neutrino mixing and mass
difference in a flux-independent way. Using the Super-Kamiokande flux
measurement in addition, two allowed regions at large mixing are found.


title:
Search for supersymmetric partners of top and bottom quarks at sqrt(s) =
  189 GeV

abstract:
  Searches for supersymmetric partners of top and bottom quarks are presented
using data taken by the DELPHI experiment at LEP in 1997 and 1998. No
deviations from standard model expectations are observed in these data sets,
which are taken at centre-of-mass energies of 183 GeV and 189 GeV and
correspond to integrated luminosities of 54 pb^{-1} and 158 pb^{-1}. These
results are used in combination with those obtained by DELPHI at lower
centre-of-mass energies to exclude regions in the squark-neutralino mass plane
at 95% confidence level.


title:
Update of the search for charginos nearly mass-degenerate with the
  lightest neutralino

abstract:
  The data collected by DELPHI in 1998 at the centre-of-mass energy of 189 GeV
have been used to update the search for charginos nearly mass-degenerate with
the lightest supersymmetric particle, which is assumed to be the lightest
neutralino. Mass differences below \Delta M = 3 GeV/c^2 are considered. No
excess of events with respect to the Standard Model expectation has been
observed, and exclusions in the plane of \Delta M versus chargino mass are
given. The new \Delta M independent lower limit on the mass of the chargino is
62.4 GeV/c^2 in the higgsino scenario (which includes the gaugino mass
unification scenario), if all sfermions are heavier than the lightest chargino.
In the approximation of large sfermion masses the limit is 59.8 GeV/c^2,
independently of the field content.


title:
A study of time-dependent CP-violating asymmetries in B0 --> J/psi K0S
  and B0 --> psi(2S) K0S decays

abstract:
  BABAR has studied the time dependent asymmetries in the the decays B0 ->
J/psi K0S and B0 -> psi(2S) K0S in a data set of 9.0 fb^-1 taken at the
Y(4S)resonance. In these channels we reconstruct 168 events of which 120 are
flavor tagged and used in a likelihood fit where we determine sin2beta. The
flavor of the other neutral $B$ mesons is tagged using information primarily
from identified leptons and Kaons. A neural network is used to recover events
without any clear Kaon or lepton signature. A preliminary result of
sin2beta=0.12+/-0.37+/-0.09 is obtained.


title: The Power Supply System of the CLEO III Silicon Detector

abstract:
  The CLEO III detector has recently commenced data taking at the Cornell
electron Storage Ring (CESR). One important component of this detector is a 4
layer double-sided silicon tracker with 93% solid angle coverage. This detector
ranges in size and number of readout channels between the LEP and LHC silicon
detectors. In order to reach the detector performance goals of signal-to-noise
ratios greater than 15:1 low noise front-end electronics together with highly
regulated low noise power supplies were used. In this paper we describe the
low-noise power supply system and associated monitoring and safety features
used by the CLEO III silicon tracker.


title:
Search for Heavy Stable and Long-Lived Particles in e+e- Collisions at
  sqrt(s)=189 GeV

abstract:
  A search for stable and long-lived heavy charged particles was performed
using the data taken by the DELPHI experiment at an energy of 189 GeV. The
Cherenkov light detected in the Ring Imaging Cherenkov Detector and the
ionisation loss measured in the Time Projection Chamber were used to identify
heavy particles passing through the detector. No evidence for the production of
such particles has been found, therefore exclusion limits at 95% confidence
level were derived on the masses of left and right handed smuons and staus. The
results were combined with previous DELPHI searches in this channel. Including
previous DELPHI results, masses of left (right) handed stable smuons and staus
can be excluded between 2 GeV/c^2 and 88 (87.5) GeV/c^2 at 95% CL.


title:
Two-fermion and Two-photon Final States at LEP2 and Search for Extra
  Dimensions

abstract:
  For the first time the experiments ALEPH, DELPHI, L3 and OPAL have presented
preliminary results for fermion-pair and photon-pair production in e+e-
collisions on the full LEP2 data set. The details of the experimental
measurements and results from their LEP-wide combination are presented. No
statistically significant deviations from the Standard Model expectations are
observed and lower limits, some obtained in dedicated analyses, for new physics
phenomena at 95 % confidence level are derived. The scales of contact
interactions are constrained to lie above 10-20 TeV, depending on the helicity
structure. The Standard Model has thus been tested at LEP2 down to distances
10^{-19} - 10^{-20} m. This has many implications, one example being the
interpretation of the new result on the anomalous magnetic moment of the muon
as coming from muon substructure. For gamma-gamma final states the QED cut-offs
are Lambda_+ > 0.44 TeV and Lambda_- > 0.37 TeV. In a combined analysis, using
e+e- and gamma-gamma final states, the most stringent lower limits to date,
M_s^+ > 1.13 TeV (lambda = +1) and M_s^- > 1.39 TeV (lambda = -1), on the low
gravity effective Planck scale are set. Constrains on the scales of string
models like TeV strings and D-branes are derived. In the last case the lower
limit is 1.5 - 4 TeV, depending on the coupling strength.


title: Search for $B^{0}\to \pi^{0}\pi^{0}$ Decay

abstract:
  We have searched for the charmless hadronic decay of B0 mesons into two
neutral pions. Using 9.13fb^-1 taken at the Upsilon(4S) with the CLEO detector,
we obtain an improved upper limit for the branching fraction BR(B0-->pi0pi0) <
5.7*10^-6 at the 90% confidence level.


title:
Measurement of Inclusive Production of Neutral Pions from Upsilon(4S)
  Decays

abstract:
  Using the Belle detector operating at the KEKB e+e- storage ring, we have
measured the mean multiplicity and the momentum spectrum of neutral pions from
the decays of the Upsilon(4S) resonance. We measure a mean of 4.70 +/- 0.04 +/-
0.22 neutral pions per Upsilon(4S) decay.


title:
A Measurement of the Branching Fraction for the Inclusive B --> X(s)
  gamma Decays with the Belle Detector

abstract:
  We have measured the branching fraction of the inclusive radiative B meson
decay B --> X(s) gamma to be Br(B->X(s)gamma)=(3.36 +/- 0.53(stat) +/-
0.42(sys) +0.50-0.54(th)) x 10^{-4}.
  The result is based on a sample of 6.07 x 10^6 BBbar events collected at the
Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e^+e^-
storage ring.


title:
Study of the Process e+ e- ---> eta gamma in c.m. Energy Range 600-1380
  MeV at CMD-2

abstract:
  The cross section of the process e+ e- ---> eta gamma has been measured in
the 600-1380 MeV c.m. energy range with the CMD-2 detector. The following
branching ratios have been determined:
  B(rho ---> eta gamma) = (3.28 +- 0.37 +- 0.23) 10^{-4},
  B(omega ---> eta gamma) = (5.10 +- 0.72 +- 0.34) 10^{-4},
  B(phi --> eta gamma) = (1.287 +- 0.013 +- 0.063) 10^{-2}.
  Evidence for the rho'(1450) ---> eta gamma decay has been obtained for the
first time.


title: Photon Events with Missing Energy at sqrt(s) = 183 to 189 GeV

abstract:
  The production of single photons has been studied in the reaction e+e- ->
gamma + invisible particles at centre-of-mass energies of 183 GeV and 189 GeV.
A previously published analysis of events with multi-photon final states
accompanied by missing energy has been updated with 189 GeV data. The data were
collected with the DELPHI detector and correspond to integrated luminosities of
about 51 pb^{-1} and 158 pb^{-1} at the two energies. The number of light
neutrino families is measured to be 2.84 +/- 0.15(stat) +/- 0.14(syst). The
absence of an excess of events beyond that expected from Standard Model
processes is used to set limits on new physics as described by supersymmetric
and composite models. A limit on the gravitational scale is also determined.


title:
Precision Neutral Current Asymmetry Parameter Measurements from the Tau
  Polarization at LEP

abstract:
  Measurements of the tau lepton polarization and forward-backward polarization
asymmetry near the Z resonance using the OPAL detector are described. The
measurements are based on analyses of tau -> e nu_e nu_tau, tau -> mu nu_mu
nu_tau, tau -> pi nu_tau, tau -> rho nu_tau and tau -> a1 nu_tau decays from a
sample of 144810 e+e- -> tau+ tau- candidates corresponding to an integrated
luminosity of 151 pb-1. Assuming that the tau lepton decays according to V-A
theory, we measure the average tau polarization near Ecm = MZ to be <Ptau> =
(-14.10 +/- 0.73 +/- 0.55)% and the tau polarization forward-backward asymmetry
to be Afb = (-10.55 +/- 0.76 +/- 0.25)%, where the first error is statistical
and the second systematic. Taking into account the small effects of the photon
propagator, photon-Z interference and photonic radiative corrections, these
results can be expressed in terms of the lepton neutral current asymmetry
parameters:
  Atau = 0.1456 +/- 0.0076 +/- 0.0057,
  Ae = 0.1454 +/- 0.0108 +/- 0.0036.
  These measurements are consistent with the hypothesis of lepton universality
and combine to give Al = 0.1455 +/- 0.0073. Within the context of the Standard
Model this combined result corresponds to sin^2(theta)(lept,effective) =
0.23172 +/- 0.00092. Combing these results with those from the other OPAL
neutral current measurements yields a value of sin^2(theta)(lept,effective) =
0.23211 +/- 0.00068.


title: B Mixing and Lifetime Measurements with the BaBar Detector

abstract:
  Recent BaBar measurements on lifetime and mixing of B mesons are reported.
Various techniques are used, ranging from the full reconstruction of hadronic B
decays, to partial reconstruction techniques, and to a totally inclusive
approach with dilepton events. The results presented are based on a data sample
collected by BaBar during the 1999-2000 data taking, and should be considered
as preliminary.


title:
Measurement of the Antilambda Polarization in nu_mu Charged Current
  Interactions in the NOMAD Experiment

abstract:
  We present a measurement of the polarization of Antilambda hyperons produced
in nu_mu charged current interactions. The full data sample from the NOMAD
experiment has been analyzed using the same V0 identification procedure and
analysis method reported in a previous paper for the case of Lambda hyperons.
The Antilambda polarization has been measured for the first time in a neutrino
experiment. The polarization vector is found to be compatible with zero.


title:
A Combination of Preliminary Electroweak Measurements and Constraints on
  the Standard Model

abstract:
  This note presents a combination of published and preliminary electroweak
results from the four LEP collaborations and the SLD collaboration which were
prepared for the 2000 summer conferences. Averages from Z0 resonance results
are derived for hadronic and leptonic cross sections, the leptonic
forward-backward asymmetries, the tau polarisation asymmetries, the bbbar and
ccbar partial widths and forward-backward asymmetries and the qqbar charge
asymmetry. Above the Z0 resonance, averages are derived for di-fermion cross
sections and asymmetries, W-pair, Z-pair and single-W production cross section,
electroweak gauge boson couplings and W mass and decay branching ratios. The
major changes with respect to results presented in summer 1999 are final Z0
lineshape results from LEP, updates to the W mass and gauge-boson couplings
from LEP, and ALR from SLD. The results are compared with precise electroweak
measurements from other experiments. The parameters of the Standard Model are
evaluated, first using the combined LEP electroweak measurements, and then
using the full set of electroweak results.


title:
Study of the effective transverse momentum of partons in the proton
  using prompt photons in photoproduction at HERA

abstract:
  The photoproduction of prompt photons, together with an accompanying jet, has
been measured with the ZEUS detector at HERA using an integrated luminosity of
38.6 pb^{-1}. A study of the effective transverse momentum, k_T, of partons in
the proton, as modelled within the framework of the PYTHIA Monte Carlo, gives a
value of k_T = 1.69+/-0.18 ^{+0.18}_{-0.20} GeV for the photon-proton
centre-of-mass energy range 134 < W < 251 GeV. This result is in agreement with
the previously observed trend in hadron-hadron scattering for k_T to rise with
interaction energy.


title:
Hadron Energy Reconstruction for the ATLAS Calorimetry in the Framework
  of the Non-parametrical Method

abstract:
  This paper discusses hadron energy reconstruction for the ATLAS barrel
prototype combined calorimeter (consisting of a lead-liquid argon
electromagnetic part and an iron-scintillator hadronic part) in the framework
of the non-parametrical method. The non-parametrical method utilizes only the
known $e/h$ ratios and the electron calibration constants and does not require
the determination of any parameters by a minimization technique. Thus, this
technique lends itself to an easy use in a first level trigger. The
reconstructed mean values of the hadron energies are within $\pm 1%$ of the
true values and the fractional energy resolution is $[(58\pm3)%
/\sqrt{E}+(2.5\pm0.3)%]\oplus (1.7\pm0.2)/E$. The value of the $e/h$ ratio
obtained for the electromagnetic compartment of the combined calorimeter is
$1.74\pm0.04$ and agrees with the prediction that $e/h > 1.7$ for this
electromagnetic calorimeter. Results of a study of the longitudinal hadronic
shower development are also presented. The data have been taken in the H8 beam
line of the CERN SPS using pions of energies from 10 to 300 GeV.


title: On the Particle Data Group evaluation of Psi' and chi_c Branching Ratios

abstract:
  I propose a new evaluation of $\psi'(2S)$ and $\chi_c(1P)$ branching ratios
which avoids the correlations affecting the current Particle Data Group
evaluation.
  These correlations explain the apparent technique-dependent discrepancies
between the available determinations of the ${\cal B}(\chi_c(1P)\to p\bar p)$
and $\Gamma(\chi_c(1P)\to \gamma\gamma)$ under the hypotesis that the current
values of the $\psi'(2S)\to\chi_c(1P)\gamma$ branching ratios are
overestimated.
  In the process I also noticed that Particle Data Group has not restated many
of the older measurements, when necessary, for the new value of ${\cal
B}(J/\psi\to l^+l^-)$, which significantly affects the evaluation of some
relevant $\psi'(2S)$ and $\chi_c(1P)$ exclusive branching ratios.


title:
Multiplicity of Charged and Neutral Pions in Deep-Inelastic Scattering
  of 27.5 GeV Positrons on Hydrogen

abstract:
  Measurements of the individual multiplicities of pi+, pi- and pi0 produced in
the deep-inelastic scattering of 27.5 GeV positrons on hydrogen are presented.
The average charged pion multiplicity is the same as for neutral pions, up to
approximately z= 0.7, where z is the fraction of the energy transferred in the
scattering process carried by the pion. This result (below z= 0.7) is
consistent with isospin invariance. The total energy fraction associated with
charged and neutral pions is 0.51 +/- 0.01 (stat.) +/- 0.08 (syst.) and 0.26
+/- 0.01 (stat.) +/- 0.04 (syst.), respectively. For fixed z, the measured
multiplicities depend on both the negative squared four momentum transfer Q^2
and the Bjorken variable x. The observed dependence on Q^2 agrees qualitatively
with the expected behaviour based on NLO-QCD evolution, while the dependence on
x is consistent with that of previous data after corrections have been made for
the expected Q^2-dependence.


title:
Single-spin Azimuthal Asymmetries in Electroproduction of Neutral Pions
  in Semi-inclusive Deep-inelastic Scattering

abstract:
  A single-spin asymmetry in the azimuthal distribution of neutral pions
relative to the lepton scattering plane has been measured for the first time in
deep-inelastic scattering of positrons off longitudinally polarized protons.
The analysing power in the sin(phi) moment of the cross section is 0.019 +/-
0.007(stat.) +/- 0.003(syst.). This result is compared to single-spin
asymmetries for charged pion production measured in the same kinematic range.
The pi^0 asymmetry is of the same size as the pi^+ asymmetry and shows a
similar dependence on the relevant kinematic variables. The asymmetry is
described by a phenomenological calculation based on a fragmentation function
that represents sensitivity to the transverse polarization of the struck quark.


title:
Momentum Resolution Improvement Technique for Silicon Tracking Detectors
  using dE/dx

abstract:
  A technique for improving the momentum resolution for low momentum charged
particles in few layer silicon based trackers is presented. The particle
momenta are determined from the measured Landau dE/dx distribution and the
Bethe-Bloch formula in the 1/beta^2 region. It is shown that a factor of two
improvement of the momentum determination is achieved as compared to standard
track fitting methods. This improvement is important in large scale heavy ion
experiments which cover the low transverse momentum spectra using stand-alone
silicon tracking devices with a few planes like the ones used in STAR at RHIC
and ALICE at LHC.


title: Search for sleptons in e+e- collisions at sqrt(s) = 183 to 189 GeV

abstract:
  Data taken by the DELPHI experiment at centre-of-mass energies of 183 GeV and
189 GeV with a total integrated luminosity of 212 pb^{-1} have been used to
search for the supersymmetric partners of the electrons, muons, and taus in the
context of the Minimal Supersymmetric Standard Model (MSSM). The decay
topologies searched for were the direct decay ({\tilde \ell} -> \ell {\tilde
\chi_1^0}), producing acoplanar lepton pairs plus missing energy, and the
cascade decay ({\tilde \ell} -> \ell {\tilde \chi_2^0} -> \ell \gamma {\tilde
\chi_1^0}), producing acoplanar lepton and photon pairs plus missing energy.
The observed number of events is in agreement with Standard Model predictions.
The 95% CL excluded mass limits for selectrons, smuons and staus are m_{\tilde
{e}} \leq 87 GeV/c^2, m_{\tilde {\mu}} \leq 80 GeV/c^2 and m_{\tilde {\tau}}
\leq 75 GeV/c^2, respectively, for values of \mu=-200 GeV/c^2 and
tan(beta)=1.5.


title:
Recent Results From CLEO on D0-D0Bar Mixing, CP Violation in D0 Decays,
  and D*+ Width

abstract:
  We present preliminary results of several analyses searching for the effects
of CP violation and mixing in the decay of $D^0$ mesons. We find no evidence of
CP asymmetry in five different two-body decay modes of the $D^0$ to pairs of
light pseudo-scalar mesons: $A_{CP}(K^+ K^-) = (+0.05 \pm 2.18 \pm 0.84)% $,
$A_{CP}(\pi^+ \pi^-) = (+2.0 \pm 3.2 \pm 0.8)% $, $A_{CP}(K^0_{\rm S} \pi^0) =
(+0.1 \pm 1.3)%$, $A_{CP}(\pi^0 \pi^0) = (+0.1 \pm 4.8)%$, and $A_{CP}(K^0_{\rm
S} K^0_{\rm S}) = (-23 \pm 19)%$. We present the first measurement of the rate
of wrong-sign $D^0 \to K^+ \pi^- \pi^0$ decay: $R = 0.0043^{+0.0011}_{-0.0010}
\pm 0.0007$. We also describe a measurement of the mixing parameter $y_{CP}=
{\Delta\Gamma\over 2 \Gamma}$ by searching for a lifetime difference between
the CP neutral $K^{-}\pi^{+}$ final state and the CP even $K^+K^-$ and
$\pi^+\pi^-$ final states. Under the assumption that CP is conserved we find
$y_{CP} = -0.011 \pm 0.025 \pm 0.014$. Finally, we present our measurement of
the \dstarp width: $96 \pm 4 \pm 22$~k$e$V.


title: Search for CP Violation in $\tau\to \pi\pi^{0}\nu_{\tau}$ Decay

abstract:
  We search for CP non-conservation in the decays of tau leptons produced via
$e^+ e^-$ annihilation at $\sqrt{s}\sim$ 10.6 GeV. The method uses correlated
decays of pairs of tau leptons, each decaying to the $\pi \pi^0 \nu_{\tau}$
final state. The search is done within the framework of a model with a scalar
boson exchange. In an analysis of a data sample corresponding to 12.2 million
produced tau pairs collected with the CLEO detector, we find no evidence of
violation of CP symmetry. We obtain a limit on the imaginary part of the
coupling constant parameterizing the relative contribution of diagrams that
would lead to CP violation to be $-0.046 <\Im(\Lambda) < 0.022$ at 90% C.L.
This result provides a restriction on CP non-conservation in the tau lepton
decays. As a cross check, we study the decay angular distribution and perform a
model-independent search for a CP violation effect of a scalar exchange in
single $\tau\to \pi\pi^0\nu_\tau$ decays. The limit on the imaginary part of
the $\tau$ scalar coupling is $-0.033 < \Im(\Lambda) < 0.089$ at 90% C.L.


title: A Fast High Resolution Track Trigger for the H1 Experiment

abstract:
  After 2001 the upgraded ep collider HERA will provide an about five times
higher luminosity for the two experiments H1 and ZEUS. In order to cope with
the expected higher event rates the H1 collaboration is building a track based
trigger system, the Fast Track Trigger (FTT). It will be integrated in the
first three levels (L1-L3) of the H1 trigger scheme to provide higher
selectivity for events with charged particles. The FTT will allow to
reconstruct 3-dimensional tracks in the central drift chamber down to 100 MeV/c
within the L2 latency of ~ 23 mus. To reach the necessary momentum resolution
of ~ 5% (at 1 GeV/c) sophisticated reconstruction algorithms have to be
implemented using high density Field Programmable Gate Arrays (FPGA) and their
embedded Content Addressable Memories (CAM). The final track parameter
optimization will be done using non-iterative fits implemented in DSPs. While
at the first trigger level rough track information will be provided, at L2
tracks with high resolution are available to form trigger decisions on
topological and other track based criteria like multiplicities and momenta. At
the third trigger level a farm of commercial processor boards will be used to
compute physics quantities such as invariant masses.


title: Bose-Einstein correlations in WW events at LEP

abstract:
  The current status of the LEP results on Bose-Einstein correlations is
discussed. Emphasis is given to the measurement of Bose-Einstein correlations
between decay products from different W's, in an energy range between 172 and
209 GeV, dependent on the experiment. For the first time all four LEP
experiments conclude that no evidence for correlations between pions from
different W's is seen at the current level of precision.


title: The Drift Chambers Of The Nomad Experiment

abstract:
  We present a detailed description of the drift chambers used as an active
target and a tracking device in the NOMAD experiment at CERN. The main
characteristics of these chambers are a large area, a self supporting structure
made of light composite materials and a low cost. A spatial resolution of 150
microns has been achieved with a single hit efficiency of 97%.


title:
Determination of the high-twist contribution to the structure function
  $xF^{\nu N}_3$

abstract:
  We extract the high-twist contribution to the neutrino-nucleon structure
function $xF_3^{(\nu+\bar{\nu})N}$ from the analysis of the data collected by
the IHEP-JINR Neutrino Detector in the runs with the focused neutrino beams at
the IHEP 70 GeV proton synchrotron. The analysis is performed within the
infrared renormalon (IRR) model of high twists in order to extract the
normalization parameter of the model. From the NLO QCD fit to our data we
obtained the value of the IRR model normalization parameter
$\Lambda^2_{3}=0.69\pm0.37~({\rm exp})\pm0.16~({\rm theor})~{\rm GeV}^2$. We
also obtained $\Lambda^2_{3}=0.36\pm0.22~({\rm exp})\pm0.12~({\rm theor})~{\rm
GeV}^2$ from a similar fit to the CCFR data. The average of both results is
$\Lambda^2_{3}=0.44\pm0.19~({\rm exp})~{\rm GeV}^2$.


title: Current Status of the K2K Experiment

abstract:
  Current status of the K2K (KEK to Kamioka) long-baseline neutrino-oscillation
experiment is presented.


title: Recent Results from the Super-Kamiokande Experiment

abstract:
  New physics results from the Super-Kamiokande experiment in 2000 are
presented.


title: Experimental Studies of Power Corrections

abstract:
  We present recent results from experimental studies of power corrections in
the model of Dokshitzer, Marchesini and Webber using data from the process e+e-
-> hadrons at several centre-of-mass energies. Fitted O(alpha_S^2)+NLLA QCD
predictions combined with power corrections to model hadronisation effects
successfully describe differential distributions and mean values of event shape
observables. The fit results for the strong coupling constant and the free
parameter of the power correction calculations from the various observables are
consistent with each other within the uncertainties. The same fits are further
employed to study the gauge structure of QCD by additionally varying the QCD
colour factors in the fits. The results are consistent with QCD based on the
SU(3) symmetry group. A new measurement of the transverse cross section is
shown using reanalysed data of the former JADE experiment at DESY and its
implications for power correction are discussed.


title:
A study of the centrally produced pi0pi0pi0 channel in pp interactions
  at 450 GeV/c

abstract:
  The reaction pp -> pf (pi0pi0pi0) ps has been studied at 450 GeV/c. The
pi0pi0pi0 effective mass spectrum shows clear eta(547) and pi2(1670) signals.
Branching ratios for the eta(547) and pi_2(1670) are given as well as upper
limits for the decays of the omega(782), a1(1260) and a2(1320) into 3pi0.


title: Charmless B decays into three charged track final states

abstract:
  Using a data sample of 10.5 1/fb collected by the Belle detector, three-body
charmless decays B+ --> K+h+h- have been studied. The following branching
fractions have been obtained: Br(B+ --> K+pi-pi+) = (64.8+-10.0+-7.0) x 10**-6
and Br(B+ --> K+K-K+) = (36.5+-6.1+-5.5) x 10**-6. The upper limits for other
combinations of charged kaons and pions have been placed. Analysis of the
intermediate two-body states gives evidence for production of scalar resonances
in charmless B decays.


title: Fragmentation of very high energy heavy ions

abstract:
  A stack of CR39 (C12H18O7)n nuclear track detectors with a Cu target was
exposed to a 158 A GeV lead ion beam at the CERN-SPS, in order to study the
fragmentation properties of lead nuclei.
  Measurements of the total, break-up and pick-up charge-changing cross
sections of ultrarelativistic Pb ions on Cu and CR39 targets are presented and
discussed.


title:
Searches for Neutral Higgs Bosons in e+e- Collisions around sqrt(s) =
  189 GeV

abstract:
  Searches for neutral Higgs bosons in the Standard Model and the MSSM have
been performed using data collected by the DELPHI experiment at a
centre-of-mass energy of 188.7 GeV, corresponding to an integrated luminosity
of 158 pb^{-1}. These analyses are used, in combination with our results from
lower energies, to set new 95% confidence level lower mass bounds on the
Standard Model Higgs boson (94.6 GeV/c^2) and on the lightest neutral scalar
(82.6 GeV/c^2) and neutral pseudoscalar (84.1 GeV/c^2) Higgs bosons in a
representative scan of the MSSM parameters. The results are also interpreted in
the framework of a general two-Higgs doublet model.


title:
Addendum to: Searches for Neutral Higgs Bosons in e+e- Collisions around
  sqrt(s) = 189 GeV

abstract: A more general MSSM parameter scan is described


title:
New calibrations and time stability of the response of the INTERCAST
  CR-39

abstract:
  We present new calibrations of different production batches (from 1989 to
1999) of the INTERCAST CR-39, using the BNL-AGS 1 A GeV iron beam. The
comparison with previous results, obtained with the 158 A GeV lead beam from
the CERN-SPS shows that, while each production batch has a different
calibration curve (mainly due to minor differences in the production
conditions), the aging effect is negligible. We also tested the dependence of
the CR-39 response from the time elapsed between exposure and analysis (fading
effect). The fading effect, if present, is less than 10%. It may be compatible
with the experimental uncertainties on the bulk etching rate vB.


title: Search for CP violation in tau decays

abstract:
  The results of the searches for CP non-conservation in the decays of tau
leptons are presented. No evidence of violation of CP symmetry is observed
neither in CLEO nor in BELLE data. Interpretation of these results is done
within the framework of a model with a scalar boson exchange. Limits on the
imaginary part of the coupling constant \Lambda, parameterizing the relative
contribution of diagrams that would lead to CP violation, are -0.046
<\Im(\Lambda) < 0.022 at 90% C.L. and |\Im(\Lambda)| < 1.7 at 90% C.L. in tau->
pi pi^0 nu_{\tau} and tau-> K pi^0 nu_{\tau} modes, respectively.


title: K+K- and KsKs Production in Two-Photon Collisions at Belle

abstract:
  The production of a kaon pair ($K^+ K^-$ and $K^0_S K^0_S$) in two-photon
processes has been measured using the Belle detector at the electron-positron
collider KEKB. We have obtained the invariant-mass distribution of the
processes between 1.3 and 2.3 GeV. A broad bump structure around 1.7 GeV in the
$K^0_S K^0_S$ channel is confirmed, while, in the $K^+ K^-$ channel, a bump
structure is seen near 1.9 GeV. The angular distribution of the final-state
kaons is analyzed to explore the spin(-helicity) structure in each
invariant-mass region for the two processes. Contributions from existing and
postulated resonances are discussed.


title: Search for a fermiophobic Higgs at LEP 2

abstract:
  Higgs bosons predicted by the fermiophobic scenario within Two Higgs Doublets
Models were searched for in the data collected by the DELPHI detector at
centre-of-mass energies between 189 GeV and 202 GeV, corresponding to a total
integrated luminosity of 380 pb^{-1}. No signal was found and confidence limits
were derived in the framework of possible extensions of the Standard Model
Higgs sector.


title:
Measurement of V_{cb} from the decay process \bar{B^0} -> D^{*+} \ell^-
  \bar{\nu}

abstract:
  A new precise measurement of |V_{cb}| and of the branching ratio BR(\bar{B^0}
-> D^{*+} \ell^- \bar{\nu_\ell}) has been performed using a sample of about
5000 semileptonic decays \bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell}, selected by
the DELPHI detector at LEP I by tagging the soft pion from D^{*+} -> D^0 \pi^+.
The results are:
  V_{cb}=(39.0 +/- 1.5 (stat.) ^{+2.5}_{-2.6} (syst. exp.) +/- 1.3 (syst. th.))
x 10^{-3}
  BR(\bar{B^0} -> D^{*+} \ell^- \bar{\nu_\ell})=(4.70 +/- 0.13 (stat.)
^{+0.36}_{-0.31} (syst. exp.))%
  The analytic dependences of the differential cross-section and of the Isgur
Wise form factor as functions of the variable w = v_{B^0}.v_{D^*} have also
been obtained by unfolding the experimental resolution.


title: Search for charginos in e+e- interactions at sqrt(s) = 189 GeV

abstract:
  An update of the searches for charginos and gravitinos is presented, based on
a data sample corresponding to the 158 pb^{-1} recorded by the DELPHI detector
in 1998, at a centre-of-mass energy of 189 GeV. No evidence for a signal was
found. The lower mass limits are 4-5 GeV/c^2 higher than those obtained at a
centre-of-mass energy of 183 GeV. The (\mu,M_2) MSSM domain excluded by
combining the chargino searches with neutralino searches at the Z resonance
implies a limit on the mass of the lightest neutralino which, for a heavy
sneutrino, is constrained to be above 31.0 GeV/c^2 for tan(beta) \geq 1.


title: Hadronic B Decays to Charmless Final States and to J/psi K*

abstract:
  Preliminary results from the BABAR experiment on charmless B decays to
charged pions or kaons, and the measurement of the B -> J/psi K* decay
amplitudes are presented. The data sample, collected at the asymmetric-energy
B-factory PEP-II at SLAC, comprises a total number of 22.7 million Y(4S)
decays, corresponding to an integrated on-resonance luminosity of approximately
21 fb-1. We measure the following CP-averaged branching fractions:
  BR(B -> pi+pi-) = (4.1 +- 1.0(stat) +- 0.7(sys))xE-6 BR(B -> K+pi-) = (16.7
+- 1.6(stat) +1.2-1.7(sys))xE-6
  and an upper limit of BR(B -> K+K-) < 2.5xE-6, at 90% confidence limit. The
measurement of the J/psi K* decay amplitudes results in R_\perp = 0.160 +-
0.032(stat) +- 0.036(sys), and reveals a dominant longitudinal component. The
phase of the longitudinal amplitude shows evidence for non-vanishing final
state interaction.


title:
Search for the Lepton Number Violating Process nu_mu-bar e^- -> mu^-
  nu_e-bar

abstract:
  The NuTeV experiment at Fermilab has used a sign-selected neutrino beam to
perform a search for the lepton number violating process nu_mu-bar e^- -> mu^-
nu_e-bar, and to measure the cross-section of the Standard Model inverse muon
decay process nu_mu e^- -> mu^- nu_e. NuTeV measures the inverse muon decay
asymptotic cross-section sigma/E to be 13.8 +/- 1.2 +/- 1.4 x 10^-42 cm^2/GeV.
The experiment also observes no evidence for lepton number violation and places
one of the most restrictive limits on the LNV/IMD cross-section ratio at < 1.7%
at 90% C.L. for V-A couplings and < 0.6% for scalar couplings.


title: Measurement of Branching Fractions for B->\pi\pi, K\pi and KK Decays

abstract:
  We report measurements of the branching fractions for $B^0\to\pi^+\pi^-$,
$K^+\pi^-$, $K^+K^-$ and $K^0\pi^0$, and $B^+\to\pi^+\pi^0$, $K^+\pi^0$,
$K^0\pi^+$ and $K^+\bar{K}{}^0$. The results are based on 10.4 fb$^{-1}$ of
data collected on the $\Upsilon$(4S) resonance at the KEKB $e^+e^-$ storage
ring with the Belle detector, equipped with a high momentum particle
identification system for clear separation of charged $\pi$ and $K$ mesons. We
find ${\cal B}(B^0\to\pi^+\pi^-) =(0.56^{+0.23}_{-0.20}\pm 0.04)\times
10^{-5}$, ${\cal B}(B^0\to K^+\pi^-) =(1.93^{+0.34 +0.15}_{-0.32 -0.06})\times
10^{-5}$, ${\cal B}(B^+\to K^+\pi^0) =(1.63^{+0.35 +0.16}_{-0.33 -0.18})\times
10^{-5}$, ${\cal B}(B^+\to K^0\pi^+) =(1.37^{+0.57 +0.19}_{-0.48 -0.18})\times
10^{-5}$, and ${\cal B}(B^0\to K^0\pi^0) =(1.60^{+0.72 +0.25}_{-0.59
-0.27})\times 10^{-5}$, where the first and second errors are statistical and
systematic. We also set upper limits of ${\cal B}(B^+\to\pi^+\pi^0)<1.34\times
10^{-5}$, ${\cal B}(B^0\to K^+K^-)<0.27\times 10^{-5}$, and ${\cal B}(B^+\to
K^+\bar{K}{}^0)<0.50\times 10^{-5}$ at the 90% confidence level.


title: ep Physics at High Q-squared

abstract:
  This article summarizes a talk presented at the SLAC Summer Institute 2000,
SLAC, Stanford, USA.
  The HERA ep collider allows the measurement of the proton structure and tests
of the Standard Model in a large region of phase space that has not been
accessible before. Such tests provide the framework for the H1 and ZEUS
Collaborations to look for physics beyond the Standard Model.


title:
Ratios of charged antiparticles to particles near mid-rapidity in Au+Au
  collisions at sqrt(s_NN) = 130 GeV

abstract:
  We have measured the ratios of antiparticles to particles for charged pions,
kaons and protons near mid-rapidity in central Au+Au collisions at sqrt(s_NN) =
130 GeV. For protons, we observe pbar/p = 0.60 +/- 0.04 (stat.) +/- 0.06
(syst.) in the transverse momentum range 0.15 < p_T < 1.0 GeV/c. This leads to
an estimate of the baryo-chemical potential mu_B of 45 MeV, a factor of 5-6
smaller than in central Pb+Pb collisions at sqrt(s_NN) = 17.2 GeV.


title: Transition to the region of central collisions and critical phenomena

abstract:
  The experimental results on the relation between the processes of total
disintegration of nuclei (or the cases with central collisions) and the
critical phenomena which can occur in the region of high degree of nuclear
disintegration or of collision centrality are discussed.


title: Measurement of Triple Gauge-Boson Couplings at LEP up to 189GeV

abstract:
  The triple gauge-boson couplings involving the W are determined using data
samples collected with the ALEPH detector at mean centre-of-mass energies of
183 GeV and 189 GeV, corresponding to integrated luminosities of 57 pb^-1 and
174 pb^-1, respectively. The couplings, g^Z_1, Kappa_gamma and lambda_gamma,
are measured using W-pair events, single-W production and single-gamma
production. Each coupling is measured individually with the other two coupling
fixed at their Standard Model value. Including ALEPH results from lower
energies, the 95% confidence level intervals for the deviation to the Standard
Model are -0.087 < Dg^Z_1 < 0.141 -0.200 < DKappa_gamma < 0.258 -0.062 <
Lambda_gamma < 0.147. Fits are also presented where two or all three couplings
are allowed to vary. In addition, W-pair events are used to set limits on the
C- or P-violating couplings g^V_4, g^V_5, Kappa_V, and Lambda_V, where V
denotes either gamma or Z. No deviations from the Standard Model expectations
are observed.


title: Search for solar axions using Li-7

abstract:
  We describe a novel approach to the search for solar, near-monochromatic
hadronic axions, the latter being suggested to be created in the solar core
during M1 transitions between the first excited level of Li-7, at 478 keV, and
the ground state. As a result of Doppler broadening, in principle these axions
can be detected via resonant absorption by the same nuclide on the Earth.
Excited nuclei of Li-7 are produced in the solar interior by Be-7 electron
capture and thus the axions are accompanied by emission of Be-7 solar neutrinos
of energy 384 keV. An experiment was made which has yielded an upper limit on
hadronic axion mass of 32 keV at the 95% confidence level.


title: Multiplicity moments in deep inelastic scattering at HERA

abstract:
  Multiplicity moments of charged particles in deep inelastic E+P scattering
have been measured with the ZEUS detector at HERA using an integrated
luminosity of 38.4 pb^{-1}$. The moments for Q^2 > 1000 GeV^2 were studied in
the current region of the Breit frame. The evolution of the moments was
investigated as a function of restricted regions in polar angle and, for the
first time, both in the transverse momentum and in absolute momentum of
final-state particles. Analytic perturbative QCD predictions in conjunction
with the hypothesis of Local Parton-Hadron Duality (LPHD) reproduce the trends
of the moments in polar-angle regions, although some discrepancies are
observed. For the moments restricted either in transverse or absolute momentum,
the analytic results combined with the LPHD hypothesis show considerable
deviations from the measurements. The study indicates a large influence of the
hadronisation stage on the multiplicity distributions in the restricted
phase-space regions studied here, which is inconsistent with the expectations
of the LPHD hypothesis.


title:
Observation of an Anomalous Number of Dimuon Events in a High Energy
  Neutrino Beam

abstract:
  A search for long-lived neutral particles (N^0's) with masses above 2.2
GeV/c^2 that decay into at least one muon has been performed using an
instrumented decay channel at the NuTeV experiment at Fermilab. Data were
examined for particles decaying into the final states mu mu, mu e, and mu pi.
Three mu mu events were observed over an expected Standard Model background of
0.069 +/- 0.010 events; no events were observed in the other modes.


title: Measurement of the Tau Polarisation at LEP

abstract:
  The polarisation of $\tau$'s produced in Z decay is measured using 160
pb$^{-1}$ of data accumulated at LEP by the ALEPH detector between 1990 and
1995. The variation of the polarisation with polar angle yields the two
parameters ${\cal A}_e = 0.1504 \pm 0.0068 $ and ${\cal A}_{\tau} = 0.1451 \pm
0.0059$ which are consistent with the hypothesis of $e$-$\tau$ universality.
Assuming universality, the value ${\cal A}_{e{-}\tau} = 0.1474 \pm 0.0045$ is
obtained from which the effective weak mixing angle $\sin^2
{\theta_{\mathrm{W}}^{\mathrm{eff}}} =0.23147 \pm 0.00057 $ is derived.


title: Energy Dependence of Nuclear Transparency in C(p,2p) Scattering

abstract:
  The transparency of carbon for (p,2p) quasi-elastic events was measured at
beam energies ranging from 6 to 14.5 GeV at 90 degrees c.m. The four momentum
transfer squared q*q ranged from 4.8 to 16.9 (GeV/c)**2. We present the
observed energy dependence of the ratio of the carbon to hydrogen cross
sections. We also apply a model for the nuclear momentum distribution of carbon
to normalize this transparency ratio. We find a sharp rise in transparency as
the beam energy is increased to 9 GeV and a reduction to approximately the
Glauber level at higher energies.


title:
Extraction of R = sigma_L/sigma_T from CCFR nu_mu-Fe and nubar_mu-Fe
  differential cross sections

abstract:
  We report on the extraction of R=sigma_L/sigma_T from CCFR nu_mu-Fe and
nubar_mu-Fe differential cross sections. The CCFR differential cross sections
do not show the deviations from the QCD expectations that are seen in the CDHSW
data at very low and very high x. R as measured in nu_mu scattering is in
agreement with R as measured in muon and electron scattering. All data on R for
Q^2 > 1 GeV^2 are in agreement with a NNLO QCD calculation which includes
target mass effects. We report on the first measurements of R in the low x and
Q^2 < 1 GeV^2 region (where an anomalous large rise in R for nuclear targets
has been observed by the HERMES collaboration).


title: Charmless B Decays Involving Vector Mesons in Belle

abstract:
  Using the data sample of 10.5 fb-1 collected by the Belle detector, we
searched for two-body charmless decays involving vector mesons. The clear
signal signature of B+ -> phi K+ is seen and its branching fraction is measured
to be (1.39+.32-.30 +- 0.2) X 10-5. The evidence for B+ -> rho pi+, B0 -> rho-
pi+ and B+ -> phi K*+ is reported and their branching fractions are determined.
No significant signals are observed for B0 -> phi K0S, -> phi K*0, -> rho- K+,
B+ -> rho K+, -> omega pi+ and -> omega K+ only the 90% C.L. upper limits are
given.


title:
Experimental Investigation of the Two-Photon Widths of the $\chi_{c0}$
  and the $\chi_{c2}$ Mesons

abstract:
  Using 12.7 $fb^{-1}$ of data collected with the CLEO detector at CESR, we
observed two-photon production of the $c \bar c$ states $\chi_{c0}$ and
$\chi_{c2}$ in their decay to $\pi^+ \pi^- \pi^+ \pi^-$. We measured
$\Gamma_{\gamma\gamma}(\chi_{c}) \times {\mathcal B}(\chi_{c} \to
\pi^+\pi^-\pi^+\pi^-)$ to be 75 +- 13 (stat) +- 8 (syst) eV for the $\chi_{c0}$
and 6.4 +- 1.8 (stat) +- 0.8 (syst) eV for the $\chi_{c2}$, implying
$\Gamma_{\gamma\gamma}(\chi_{c0})$ = 3.76 +- 0.65 (stat) +- 0.41 (syst) +- 1.69
(br) keV and $\Gamma_{\gamma\gamma}(\chi_{c2})$ = 0.53 +- 0.15 (stat) +- 0.06
(syst) +- 0.22 (br) keV. Also, cancelation of dominant experimental and
theoretical uncertainties permits a precise comparison of
$\Gamma_{\gamma\gamma}(\chi_{c0})/\Gamma_{\gamma\gamma}(\chi_{c2})$, evaluated
to be 7.4 +- 2.4 (stat) +- 0.5 (syst) +- 0.9 (br), with QCD-based predictions.


title: Measurements of the rare decay K_{L} -> e^{+} e^{-} e^{+} e^{-}

abstract:
  We observe 441 K_{L} -> e^{+} e^{-} e^{+} e^{-} candidate events with a
background of 4.2 events and measure B(K_{L} -> e^{+} e^{-} e^{+} e^{-}) =
(3.72 \pm 0.18(stat) \pm 0.23(syst)) \times 10^{-8} in the KTeV/E799II
experiment at Fermilab. Using the distribution of the angle between the planes
of the e^{+} e^{-} pairs, we measure the CP parameters beta_{CP} = -0.23 \pm
0.09(stat) \pm 0.02(syst) and gamma_{CP} = -0.09 \pm 0.09(stat) \pm 0.02(syst).
We also present the first detailed study of the e^{+} e^{-} invariant mass
spectrum in this decay mode.


title: Physics at TESLA

abstract:
  The physics at a 500-800 GeV electron positron linear collider, TESLA, is
reviewed. The machine parameters that impact directly on the physics are
discussed and a few key performance goals for a detector at TESLA are given.
Emphasis is placed on precision measurements in the Higgs and top sectors and
on extrapolation to high energy scales in the supersymmetric scenario.


title: Radiative B Meson Decay

abstract:
  We studied radiative B meson decays with the Belle detector. We measured the
following branching fractions; Br(B->K*0(892)\gamma) = (49.6 \pm 6.7 \pm 4.5) x
10^{-6}, Br(B->K*+(892)\gamma) = (38.9 \pm 9.3 \pm 4.1) x 10^{-6},
Br(B->Xs\gamma) = (3.39 \pm 0.53 \pm 0.42 +0.51-0.55) x 10^{-4}. We also set an
upper limit for B -> \rho\gamma as Br(B->\rho\gamma)/Br(B->K*(892)\gamma) <
0.19 at 90% confidence level.


title: The e/h ratio of the ATLAS Hadronic Tile Calorimeter

abstract: This paper has been withdrawn by the authors.


title:
Measurement of the Mass and Width of the W Boson in e+e- Collisions at
  sqrt(s) = 189 GeV

abstract:
  A measurement of the W mass and width has been performed by the DELPHI
collaboration using the data collected during 1998. The data sample has an
integrated luminosity of 155 pb^{-1} and an average centre-of-mass energy of
188.6 GeV. Results are obtained by applying the method of direct reconstruction
of the mass of the W from its decay products in both the W+W- -> lvqq and W+W-
-> qqqq channels. The W mass result for the 1998 data set is M_W = 80.387 +/-
0.087 (stat) +/- 0.034 (syst) +/- 0.017 (LEP) +/- 0.035 (FSI) GeV/c2, where FSI
represents the uncertainty due to final state interaction effects in the qqqq
channel, and LEP represents that arising from the knowledge of the beam energy
of the accelerator. Combining this result with those previously published by
the DELPHI collaboration gives the result M_W = 80.359 +/- 0.074 (stat) +/-
0.032 (syst) +/- 0.017 (LEP) +/- 0.033 (FSI) GeV/c2. The combined value for the
W width is \Gamma_W = 2.266 +/- 0.176 (stat) +/- 0.056 (syst) +/- 0.052 (FSI)
GeV/c2.


title: Bs Physics at LEP, SLD, and CDF: Delta m_s and Delta Gamma_s

abstract:
  The current status of the experimental knowledge of $\Bs$ meson physics is
reviewed. Results from LEP and CDF on the width difference $\dgs$ are
presented, the corresponding average is found to be in good agreement with the
present theoretical estimation. The $\Bs$ oscillations have not yet been
resolved, despite the progress recently achieved by SLD and ALEPH. The world
combination, including results from the LEP experiments, SLD and CDF, is
presented, together with the expected and observed lower limit on the $\Bs$
oscillation frequency. A tantalizing hint of an oscillation is observed around
$\dms\sim17 \psin$, near future results could increase the significance of this
hint.


title:
Evidence for Neutrino Oscillations from the Observation of Electron
  Anti-neutrinos in a Muon Anti-Neutrino Beam

abstract:
  A search for muon anti-neutrino to electron anti-neutrino oscillations was
conducted by the Liquid Scintillator Neutrino Detector at the Los Alamos
Neutron Science Center using muon anti-neutrinos from positive muon decay at
rest. A total excess of 87.9 +/- 22.4 +/- 6.0 events consistent with electron
anti-neutrino plus proton scattering to positron plus neutron was observed
above the expected background. This excess corresponds to an oscillation
probability of (0.264 +/- 0.067 +/- 0.045), which is consistent with an earlier
analysis. In conjunction with other known limits on neutrino oscillations, the
LSND data suggest that neutrino oscillations occur in the 0.2-10 eV^2/c^4
Delta-m^2 range, indicating a neutrino mass greater than 0.4 eV/c^2.


title: BES R measurements and $J/\psi$ decays

abstract:
  R measurement results in 2--5 GeV region by BESII is reported in this talk.
The study on $\sigma$ particle in $J/\psi \to \omega \pi^+ \pi^-$, based on
$7.8 \times 10^6$ BESI $J/\psi$ data, is also reported.


title: Observation of Cabibbo suppressed $B \to D^{(*)}K^-$ decays at Belle

abstract:
  Cabibbo-suppressed decays $B \to D^{(*)} K^-$ using a 10.4 fb$^{-1}$ data
sample accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at
the KEKB $e^+ e^-$ storage ring. The high-momentum particle identification
system of Belle is used to isolate signals for $B\to D^0 K^-$, $D^+K^-$,
$D^{*0}K^-$ and $D^{*+}K^-$ from the $B\to D^{(*)}\pi^-$ decay processes which
have much larger branching fractions. We report ratios of Cabibbo-suppressed to
Cabibbo-favored branching fractions of: ${\cal B}(B^- \to D^0 K^-)/{\cal B}(B^-
\to D^0\pi^-) = 0.079\pm0.009\pm0.006$; ${\cal B}(\bar{B^0} \to D^+ K^-)/{\cal
B}(\bar{B^0} \to D^+\pi^-) = 0.068\pm0.015\pm0.007$; ${\cal B}(B^-\to
D^{*0}K^-)/{\cal B}(B^-\to D^{*0}\pi^-) = 0.078 \pm 0.019 \pm 0.009$; and
${\cal B}(\bar{B}^0\to D^{*+}K^-)/{\cal B}(\bar{B}^0\to D^{*+}\pi^-)= 0.074 \pm
0.015 \pm 0.006$. The first error is statistical and the second is systematic.
These are the first reported observations of the $B\to D^+K^-$, $D^{*0}K^-$ and
$D^{*+}K^-$ decay processes.


title: Tests of QED with Multi-Photonic Final States

abstract:
  In the Standard Model the process e+e- -> gamma-gamma is fully described by
QED. Measurements of the differential cross-sections from the four LEP
experiments are compared to the QED expectation and limits are set on
parameters describing physics beyond the Standard Model. Three-photon events
are used for a direct search for a photonically decaying resonance produced
together with a photon.


title:
Measurements of Charmed Meson Lifetimes and Search for
  $D^0$-$\overline{D}^0$ Mixing with the Belle Experiment

abstract:
  The lifetimes of charmed mesons have been measured using 11.1fb$^{-1} of data
collected with the Belle detector at KEKB. Each candidate is fully
reconstructed to identify the flavor of the charmed meson. The lifetimes are
measured to be $\tau(D^0)=(414.5\pm1.7)$ fs, $\tau(D^+)=(1029\pm12)$ fs and
$\tau(D_s^+)=(488.4^{+7.8}_{-7.7})$ fs, where the error is statistical only.
The mixing parameter $y_{CP}$ is also measured to be
$y_{CP}=(1.16^{+1.67}_{-1.65}(stat.))%$ through the lifetime difference of
$D^0$ mesons decaying into CP-mixed states and CP eigenstates.


title: Measurement of the decays B-->phi K and B-->phi K^*

abstract:
  We have observed the decays B-->phi K and phi K^* in a sample of over 45
million B mesons collected with the BABAR detector at the PEP-II collider. The
measured branching fractions are BF(B^+ --> phi K^+) = (7.7^{+1.6}_{-1.4}+/-
0.8) x 10^{-6}, BF(B^0 --> phi K^0) = (8.1^{+3.1}_{-2.5}+/- 0.8) x 10^{-6},
BF(B^+ --> phi K^{*+}) = (9.7^{+4.2}_{-3.4}+/- 1.7) x 10^{-6}, and BF(B^0 -->
phi K^{*0}) = (8.6^{+2.8}_{-2.4}+/- 1.1) x 10^{-6}. We also report the upper
limit BF(B^+ --> phi pi^+) < 1.4 x 10^{-6}$ (90% CL).


title:
Rate Measurement of $D^{0}\to K^{+}\pi^{-}\pi^{0}$ and Constraints on
  $D^{0} - \overline{D^{0}}$ Mixing

abstract:
  We present an observation and rate measurement of the decay D0 -> K+pi-pi0
produced in 9/fb of e+e- collisions near the Upsilon(4S) resonance. The signal
is inconsistent with an upward fluctuation of the background by 4.9 standard
deviations. We measured the rate of D0 -> K+pi-pi0 normalized to the rate of
D0bar -> K+pi-pi0 to be 0.0043 +0.0011 -0.0010 (stat) +/- 0.0007 (syst). This
decay can be produced by doubly-Cabibbo-suppressed decays or by the D0 evolving
into a D0bar through mixing, followed by a Cabibbo-favored decay to K+pi-pi0.
We also found the CP asymmetry A=(8 +25 -22)% to be consistent with zero.


title: Search for Electroweak Production of Single Top Quarks at DZero

abstract:
  This paper discusses 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. 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: A Search for Single Top Quark Production at DZero

abstract:
  We present details of 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. 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: Study of Rare B Meson Decays at Belle

abstract:
  In this paper, we briefly review results on rare decays of $B$ mesons from
the Belle experiment, based on 10.4 fb$^{-1}$ data collected on the
$\Upsilon$(4S) resonance. The topics include measurements of Cabibbo suppressed
decays $B \to D^{(*)} K^{(*)}$, charmless two-body decays $B \to \pi\pi$,
$K\pi$, $KK$ and $B \to \eta^{'} h (h = K^+, \pi^+, K^0)$, and a search for
flavor changing neutral current decays $B \to K^{(*)} \ell^{+} \ell^{-}$.


title:
Studies of Prototype CsI(Tl) Crystal Scintillators for Low-Energy
  Neutrino Experiments

abstract:
  Crystal scintillators provide potential merits for the pursuit of low-energy
low-background experiments. A CsI(Tl) scintillating crystal detector is being
constructed to study low-energy neutrino physics at a nuclear reactor, while
projects are underway to adopt this technique for dark matter searches. The
choice of the geometrical parameters of the crystal modules, as well as the
optimization of the read-out scheme, are the results of an R&D program.
Crystals with 40 cm in length were developed. The detector requirements and the
achieved performance of the prototypes are presented. Future prospects for this
technique are discussed.


title: Four Fermion processes at LEP II

abstract:
  In its second phase, LEP has given the unique opportunity to study four
fermion processes never observed before. This papers deals with a preliminary
study of $WW$, $We\nu$, $ZZ$ and $Z\gamma^\star$ production in $e^+e^-$
collisions. Measurement results on $WW$ cross section, $W$ branching fractions,
$WWV$ ($V=Z/\gamma$) anomalous couplings and $W$ average polarization in $WW$
events are presented. Moreover cross section measurements for $We\nu$, $ZZ$ and
$Z\gamma^\star$ production and limits on $ZZZ$ and $ZZ\gamma$ anomalous
couplings are reported. All the results are in good agreement with the Standard
Model expectations.


title: Studies of b-quark fragmentation

abstract:
  I will review new studies of b-quark fragmentation performed at the Z peak by
ALEPH and SLD. An improved sensitivity to distinguish between fragmentation
model and more accurate measurements of the mean b-hadron scaled energy have
been obtained.


title:
Experimental Investigations of Changes in beta-decay rate of Co-60 and
  Cs-137

abstract:
  Results of simultaneous measurements of beta-decay rate with the aid of
Ge(Li)-detectors performed at two laboratories 140km apart (INR RAS, Troitsk,
Co-60, and JINR, Dubna, Cs-137) during a period from 15.03.2000 till
10.04.2000, are presented. Regular deviations of the count rate of gamma-quanta
following the beta-decay of $\sim$ 0.7% (INR RAS, Co-60) and $\sim$ 0.2% (JINR,
Cs-137) from the statistical average, are observed. The analysis of extremum
deviations of gamma-quanta count rate shows that the set of directions of
tangents to the Earth's parallels of latitude at the extremum points of
trajectories of motion in the space of each laboratory clearly forms three
separate compact subsets of directions which agree, for two laboratories, to an
accuracy of $\pm10^\circ$. This phenomenon is shown not to be explained on the
basis of traditional notion. A possible explanation is suggested basing on the
hypothesis that there exists a new anisotropic interaction caused by the
cosmological vectorial potential \textbf{A}$_{\rm g}$, a new fundamental
constant having, according to the experiments carried out, the coordinate of
right ascension $\alpha \approx 285^\circ$ in the second equatorial system.
This is in agreement with earlier experiments.


title: Reach of future colliders in probing the structure of the photon

abstract:
  A comparison of the potentials of ep and e^+e^-$machines to probe the
structure of the photon is performed. In particular, the kinematic reach of a
proposed future ep facility, THERA, is compared with those of current
colliders, LEP and HERA, and with the proposed linear collider, TESLA. THERA
like HERA will use a proton beam of 920 GeV but with an increased electron beam
energy of 250 GeV allowing higher scales, Q^2, and lower values of parton
momentum fraction in the photon, x_\gamma, to be probed.


title: Study of N* Production from J/Psi--> p pbar eta

abstract:
  Data are presented on the reaction J/psi--> p pbar eta using 7.8 million
J/psi triggers collected by the BEjing Spectrometer (BES). A partial wave
analysis is performed. A clear enhancement near the p eta(pbar eta) threshold
is observed. It is fitted with a JP=1/2- resonance with mass $M= 1530\pm 10$
MeV and width $\Gamma = 95\pm 25$ MeV. In addition, there is a peak around 1650
MeV with JP=1/2- preferred also, fitted with $M =1647\pm 20$ MeV and $\Gamma =
145^{+80}_{-45}$ MeV. These two N* resonances are believed to be the two well
established states, S11(1535) and S11(1650), respectively. It is the first
partial wave study of the production of these resonances from J/psi decays.