title: Photon collider at TESLA

abstract:
  High energy photon colliders (gamma-gamma, gamma-electron) based on backward
Compton scattering of laser light is a very natural addition to e+e- linear
colliders. In this report we consider this option for the TESLA project. Recent
study has shown that the horizontal emittance in the TESLA damping ring can be
further decreased by a factor of four. In this case the gamma-gamma luminosity
luminosity in the high energy part of spectrum can reach (1/3)L_{e+e-}. Typical
cross sections of interesting processes in gamma-gamma collisions are higher
than those in e+e- collisions by about one order of magnitude, so the number of
events in gamma-gamma collisions will be more than that in e+e- collisions.
Photon colliders can, certainly, give additional information and they are the
best for the study of many phenomena. The main question is now the technical
feasibility. The key new element in photon colliders is a very powerful laser
system. An external optical cavity is a promising approach for the TESLA
project. A free electron laser is another option. However, a more
straightforward solution is ``an optical storage ring (optical trap)'' with
diode pumped solid state laser injector which is today technically feasible.
This paper briefly reviews the status of a photon collider based at TESLA, its
possible parameters and existing problems.

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


title:
Introduction and recent developments in gamma-gamma, gamma-electron
  colliders

abstract:
  High energy photon colliders (gamma-gamma, gamma-electron) based on backward
Compton scattering of laser light is a very natural addition to e+e- linear
colliders. In this report we consider mainly this option for the TESLA project.
Recent study has shown that the horizontal emittance in the TESLA damping ring
can be further decreased by a factor of four. In this case the gamma-gamma
luminosity luminosity in the high energy part of spectrum can reach 0.3--0.5
L_e+e-. Typical cross sections of interesting processes in gamma-gamma
collisions are higher than those in e+e- collisions by about one order of
magnitude, so the number of events in gamma-gamma collisions will be more that
in e+e- collisions. The key new element in photon colliders is a very powerful
laser system. The most straightforward solution is ``an optical storage ring
(optical trap)'' with diode pumped laser injector which is today technically
feasible. This paper briefly review the status of a photon collider based at
TESLA, its possible parameters.


title: Observation of the $\Omega_{c}^{0}$ Charmed Baryon at CLEO

abstract:
  The CLEO experiment at the CESR collider has used 13.7 fb$^{-1}$ of data to
search for the production of the $\Omega_c^0$ (css-ground state) in
$e^{+}e^{-}$ collisions at $\sqrt{s} \simeq 10.6$ {\rm GeV}. The modes used to
study the $\Omega_c^0$ are $\Omega^- \pi^+$,
  $\Omega^- \pi^+ \pi^0$, $\Xi^- K^- pi^+ \pi^+$, $\Xi^0 K^- pi^+$, and
$\Omega^- \pi^+ \pi^- \pi^+$. We observe a signal of 40.4$\pm$9.0(stat) events
at a mass of 2694.6$\pm$2.6(stat)$\pm$1.9(syst) {\rm MeV/$c^2$}, for all modes
combined.


title: Study of $B\to \psi (2S)K$ and $B\to \psi (2S)K^{*}$(892) Decays

abstract:
  Color-suppressed decays of $B$ mesons to final states with $\psi(2S)$ mesons
have been observed with the CLEO detector. The branching fractions for the
decays $B^+ \to \psi(2S) K^+$, $B^+ \to \psi(2S) K^*(892)^+$, $B^0 \to \psi(2S)
K^0$, and $B^0 \to \psi(2S) K^*(892)^0$ are measured to be (7.8 +- 0.7 +- 0.9)
10^{-4}$, (9.2 +- 1.9 +- 1.2) 10^{-4}$, (5.0 +- 1.1 +- 0.6) 10^{-4}$, and (7.6
+- 1.1 +- 1.0) 10^{-4}$, respectively, where the first uncertainty is
statistical and the second is systematic. The first measurement of the
longitudinal polarization fraction is extracted from the angular analysis of
the $B \to \psi(2S) K^*(892)$ candidates: $\Gamma_L / \Gamma = 0.45 +- 0.11 +-
0.04 $. Our measurements of the decays $B^0 \to \psi(2S) K^0$ and $B^+ \to
\psi(2S) K^*(892)^+$ are first observations.


title: The "Golden Mode" at the Upgraded Tevatron?

abstract:
  The exiatence of extra SM families results in essential enhancement of the
gluon fusion channel Higgs boson production at hadron colliders. In this case,
the SM Higgs boson can be seen at the upgraded Tevatron via the "golden mode"
(H-->4l) for certain values of its mass.


title: Light meson and baryon spectroscopy from charm decays in Fermilab E791

abstract:
  We present results from Fermilab experiment E791. We extracted the fractions
of resonant components in the $\Lambda_c^+\to p K^- \pi^+$ decays, and found a
significant polarization of the $\Lambda_c^+$ using a fully 5-dimensional
resonant analysis. We also did resonant analyses of $D^+$ and $D^+_s$ decays
into $\pi^+\pi^-\pi^+$. We observed an insignificant asymmetry in the Breit
Wigner describing the $f_0(980)$ and found good evidence for a light and broad
scalar resonance in the $D^+$ decays.


title: Rare Kaon Decays

abstract:
  Rare kaon decays via Flavor Changing Neutral Currents are discussed in the
context of the CKM unitarity triangle with a particular interest in the rare
kaon decays K^+ --> pi^+ nu nubar and K^0_L --> pi^0 nu nubar. New results and
the status of these experiments are reported.


title: Possible Observation of a Second Kind of Light

abstract:
  According to classical electrodynamics, sunlight that is passed through an
iron layer can be detected with the naked eye only if the thickness of the
layer is less than 170nm. However, in an old experiment, August Kundt was able
to see the sunlight with the naked eye even when it had passed an iron layer
with thickness greater than 200nm. To explain this observation, we propose a
second kind of light which was introduced in a different context by Abdus
Salam. A tabletop experiment can verify this possibility.


title:
Comparison of Deep Inelastic Electron-Photon Scattering Data with the
  Herwig and Phojet Monte Carlo Models

abstract:
  Deep inelastic electron-photon scattering is studied in the Q**2 range from
1.2 to 30 GeV**2 using the LEP1 data taken with the ALEPH, L3 and OPAL
detectors at centre-of-mass energies close to the mass of the Z boson.
Distributions of the measured hadronic final state are corrected to the hadron
level and compared to the predictions of the HERWIG and PHOJET Monte Carlo
models. For large regions in most of the distributions studied the results of
the different experiments agree with one another. However, significant
differences are found between the data and the models. Therefore the combined
LEP data serve as an important input to improve on the Monte Carlo models.


title: Introduction to high$-p_T$ inclusives

abstract:
  A selection of theoretical and experimental results are presented in the
broader context of understanding QCD and its relation to photon physics. A
phenomenological analysis of HERA data to constrain the gluon content of the
proton and photon is discussed. Measurements from the Tevatron and fixed-target
experiments are compared to theoretical predictions. Finally, the future of
higher order pQCD calculations is addressed.


title:
Direct measurement of the pion valence quark momentum distribution, the
  pion light-cone wave function squared

abstract:
  We present the first direct measurements of the pion valence quark momentum
distribution which is related to the square of the pion light-cone wave
function. The measurements were carried out using data on diffractive
dissociation of 500 GeV/c $\pi^-$ into di-jets from a platinum target at
Fermilab experiment E791. The results show that the $|q\bar {q}>$ light-cone
asymptotic wave function, which was developed using perturbative QCD methods,
describes the data well for $Q^2 \sim 10 ~{\rm (GeV/c)^2}$ or more. We also
measured the transverse momentum distribution of the diffractive di-jets.


title: Observation of color-transparency in diffractive dissociation of pions

abstract:
  We have studied the diffractive dissociation into di-jets of 500 GeV/c pions
scattering coherently from carbon and platinum targets. Extrapolating to
asymptotically high energies (where t_{min} approaches 0) we find that when the
per-nucleus cross-section for this process is parameterized as $\sigma =
\sigma_0 A^{\alpha}, \alpha$ has values near 1.6, the exact result depending on
jet transverse momentum. These values are in agreement with those predicted by
theoretical calculations of color-transparency.


title:
Centrality dependence of K+ produced in Pb+Pb collisions at 158 GeV per
  nucleon

abstract:
  The NA52 collaboration searches for a discontinuous behaviour of charged
kaons produced in Pb+Pb collisions at 158 A GeV as a function of the impact
parameter, which could reveal a hadron to quark-gluon plasma (QGP) phase
transition. The K+ yield is found to grow proportional to the number of
participating ('wounded') nucleons N, above N=100. Previous NA52 data agree
with the above finding and show a discontinuous behaviour in the kaon
centrality dependence near N=100, marking the onset of strangeness enhancement
-over e.g. p+A data at the same \sqrt{s}- in a chemically equilibrated phase.


title: Event shape studies at HERA

abstract:
  Recent progress on the study of power corrections applied to event shape
variables in deep inelastic ep scattering is discussed.


title: Search for a Scalar Bottom Quark with Mass 3.5-4.5 GeV/$c^{2}$

abstract:
  We report on a search for a supersymmetric $\tilde{B}$ meson with mass
between 3.5 and 4.5 GeV/$c^2$ using 4.52 ${\rm fb}^{-1}$ of integrated
luminosity produced at $\sqrt{s}=10.52$ GeV, just below the $e^+e^-\to
B\bar{B}$ threshold, and collected with the CLEO detector. We find no evidence
for a light scalar bottom quark.


title: Rare Kaon Decays

abstract:
  The current status of the study of rare kaon decays is reviewed. Future
prospects are discussed.


title:
Lower limit on the mass of the neutralino (LSP) at LEP with the ALEPH
  detector

abstract:
  The large amount of data accumulated at LEP2 by the ALEPH experiment has been
used to search for supersymmetric particles. No signal has been found therefore
limits have been determined. Within the Constrained Minimal Supersymmetric
Standard Model, the constraints from direct SUSY searches of charginos,
sleptons and neutralinos, are combined to extract a lower limit on the mass of
the neutralino considered to be the Lightest Supersymmetric particle. An
improved limit is obtained when the limit on the Higgs mass is included.
Neutralino masses up to 38 GeV/c^2 are excluded at 95 % confidence level.


title: Recent Results on Charm Photoproduction

abstract:
  Photoproduction of $D_s^{\pm}$ mesons has been measured in the ZEUS detector
at HERA and compared with predictions of NLO pQCD calculations. The ratio of
$D_s^{*\pm}$ to $D^{*\pm}$ cross sections has been compared to results from
$e^{+}e^{-}$ experiments. Orbitally excited P-wave charm mesons have been
observed in the $D^{*\pm}\pi^{\mp}$ final state. The fraction of $D^{*\pm}$ 's
originating from these mesons has been calculated and compared with that from
$e^{+}e^{-}$ interactions. No evidence for radially excited mesons decaying to
$D^{*\pm}\pi^{+}\pi^{-}$ was found. The inelastic production of J/$\psi$ mesons
has been measured and compared to LO and NLO pQCD predictions.


title: Energy loss of fast quarks in nuclei

abstract:
  We report an analysis of the nuclear dependence of the yield of Drell-Yan
dimuons from the 800 GeV/c proton bombardment of $^2H$, C, Ca, Fe, and W
targets. Employing a new formulation of the Drell-Yan process in the rest frame
of the nucleus, this analysis examines the effect of initial-state energy loss
and shadowing on the nuclear-dependence ratios versus the incident proton's
momentum fraction and dimuon effective mass. The resulting energy loss per unit
path length is $-dE/dz = 2.32 \pm 0.52\pm 0.5$ GeV/fm. This is the first
observation of a nonzero energy loss of partons traveling in nuclear
environment.


title:
Search for Neutral Supersymmetric Higgs Bosons in $p\bar{p}$ Collisions
  at $\sqrt{s}=1.8$ TeV

abstract:
  We present the results of a search for neutral Higgs bosons produced in
association with $b$ quarks in $p\bar{p}\to b\bar{b} \phi\to b\bar{b}b\bar{b}$
final states with $91 \pm 7$ pb$^{-1}$ of $p\bar{p}$ collisions at
$\sqrt{s}=1.8$ TeV recorded by the Collider Detector at Fermilab. We find no
evidence of such a signal and the data is interpreted in the context of the
neutral Higgs sector of the Minimal Supersymmetric extension of the Standard
Model. With basic parameter choices for the supersymmetric scale and the stop
quark mixing, we derive 95% C.L. lower mass limits for neutral Higgs bosons for
$\tb$ values in excess of 35.


title:
Measurement and QCD Analysis of Jet Cross Sections in Deep-Inelastic
  Positron-Proton Collisions at sqrt(s) of 300 GeV

abstract:
  Jet production is studied in the Breit frame in deep-inelastic
positron-proton scattering over a large range of four-momentum transfers 5 <
Q^2 < 15000 GeV^2 and transverse jet energies 7 < E_T < 60 GeV. The analysis is
based on data corresponding to an integrated luminosity of L_int \simeq 33
pb^(-1) taken in the years 1995-1997 with the H1 detector at HERA at a
center-of-mass energy sqrt(s)=300 GeV. Dijet and inclusive jet cross sections
are measured multi-differentially using k_perp and angular ordered jet
algorithms. The results are compared to the predictions of perturbative QCD
calculations in next-to-leading order in the strong coupling constant
alphas.QCD fits are performed in which alphas and the gluon density in the
proton are determined separately. The gluon density is found to be in good
agreement with results obtained in other analyses using data from different
processes. The strong coupling constant is determined to be
alphas(MZ)=0.1186+-0.0059. In addition an analysis of the data in which both
alphas and the gluon density are determined simultaneously is presented.


title: Neutrino physics and astrophysics with the MACRO detector

abstract:
  After a brief presentation of the MACRO detector we discuss the data on
atmospheric neutrinos and neutrino oscillations, on high energy (E> 1 GeV)
neutrino astronomy, on indirect searches for WIMPs and low energy (E >7 MeV)
stellar collapse neutrinos.


title: Energy calibration of large underwater detectors using stopping muons

abstract:
  We propose to use stopping cosmic-ray muons in the energy calibration of
planned and deployed large underwater detectors. The method is based on the
proportionality between the incident muon energy and the length of the muon
path before it stops. Simultaneous measurements of the muon path and the
amplitude of the signal from the photomultiplier tubes allow a relation between
the energy deposited in the sensitive volume of the detector and the observed
signal to be derived, and also provide a test of detector simulations. We
describe the proposed method and present the results of simulations.


title: Kaon and $\Phi$ production vs Participants in Nuclear Collisions

abstract:
  Data on kaon and $\Phi$ production in nuclear collisions as a function of
centrality are analysed both at AGS and SPS energy range. We compare the
results of several experiments, looking for common trend in `participant
scaling' of production yields. We find a smooth description of scaled kaon and
$\Phi$ yields as a function of participant density. We also show a participant
density dependence of kaons and $\Phi$ produced in the forward hemisphere for
proton-nucleus collisions.


title:
PIN Photodiodes for Radiation Monitoring and Protection in the BaBar
  Silicon Vertex Tracker

abstract:
  We discuss the design, implementation and performance of the radiation
monitoring and protection system used by the Silicon Vertex Tracker (SVT) in
the BaBar detector. Using 12 reverse-biased PIN photodiodes mounted around the
beampipe near the IP, we are able to provide instantaneous radiation dose
rates, absorbed dose integrals, and active protection that aborts the
circulating beams in the PEP-II storage ring when radiation levels exceed
user-defined thresholds. The system has reliably protected the SVT from
excessive radiation damage and has also served as a key diagnostic tool in
understanding radiation backgrounds at PEP-II.


title: A Measurement of the Branching Ratio of $K_L \to e^+e^-\gamma\gamma$

abstract:
  We report on a study of the decay $K_L \to e^+e^-\gamma\gamma$ carried out as
a part of the KTeV/E799 experiment at Fermilab. The 1997 data yielded a sample
of 1543 events, including an expected background of $56 \pm 8$ events. An
effective form factor was determined from the observed distribution of the
$e^+e^-$ invariant mass. Using this form factor in the calculation of the
detector acceptance, the branching ratio was measured to be ${\mathcal B}(K_L
\to e^+ e^- \gamma \gamma, E^*_\gamma > 5 {MeV}) = (5.84 \pm 0.15 {\rm ~(stat)}
\pm 0.32 {\rm ~(sys)})\times 10^{-7}$.


title: Charm and bottom production in two-photon collisions with OPAL

abstract:
  A preliminary update of the previous OPAL measurement of the inclusive
production of D* mesons in anti-tagged photon-photon collisions is presented
together with the first preliminary OPAL measurement of bottom production in
photon-photon collisions.


title: Clopper-Pearson Bounds from HEP Data Cuts

abstract:
  For the measurement of $N_s$ signals in $N$ events rigorous confidence bounds
on the true signal probability $p_{\rm exact}$ were established in a classical
paper by Clopper and Pearson [Biometrica 26, 404 (1934)]. Here, their bounds
are generalized to the HEP situation where cuts on the data tag signals with
probability $P_s$ and background data with likelihood $P_b<P_s$. The Fortran
program which, on input of $P_s$, $P_b$, the number of tagged data $N^Y$ and
the total number of data $N$, returns the requested confidence bounds as well
as bounds on the entire cumulative signal distribution function, is available
on the web. In particular, the method is of interest in connection with the
statistical analysis part of the ongoing Higgs search at the LEP experiments.


title:
Searches for neutral Higgs bosons in e+e- collisions at centre-of-mass
  energies from 192 to 202GeV

abstract:
  Searches for neutral Higgs bosons are performed with the 237 pb-1 of data
collected in 1999 by the ALEPH detector at LEP, for centre-of-mass energies
between 191.6 and 201.6 GeV. These searches apply to Higgs bosons within the
context of the Standard Model and its minimal supersymmetric extension (MSSM)
as well as to invisibly decaying Higgs bosons. No evidence of a signal is seen.
A lower limit on the mass of the Standard Model Higgs boson of 107.7 GeV/c2 at
95% confidence level is set. In the MSSM, lower limits of 91.2 and 91.6 GeV/c2
are derived for the masses of the neutral Higgs bosons h and A, respectively.
For a Higgs boson decaying invisibly and produced with the Standard Model cross
section, masses below 106.4 GeV/c2 are excluded.


title: Search for Susy with Missing Transverse Energy and Jets at CDF

abstract:
  Events with signatures involving large missing transverse energy (MET) are
among the quintessential search modes for R-parity conserving supersymmetry.
CDF has conducted two recent analyses for supersymmetry which use MET and jets.
The MET and monojet signature is employed to determine process independent
limits for the production of new physics beyond the Standard Model and then
applied to models of spontaneous breaking of supersymmetry to determine limits
on the supersymmetry breaking parameter and the gravitino mass. Direct searches
for scalar top and scalar bottom quarks within the framework of supersymmetric
models are performed using a signature of MET and two heavy flavor jets. Since
the data is found to be consistent with Standard Model expectations, limits are
determined in the mass planes $m (\tilde{\chi}_{1}^{0}) - m (\tilde{t}_{1})$
and $m (\tilde{\chi}_{1}^{0}) - m (\tilde{b}_{1})$.


title: Search for Second and Third Generation Leptoquarks at CDF

abstract:
  We report the results of a search for second and third generation leptoquarks
using 88 ${pb}^{-1}$ of data recorded by the Collider Detector at Fermilab.
Color triplet technipions, which play the role of scalar leptoquarks, are
investigated due to their potential production in decays of strongly coupled
color octet technirhos. Events with a signature of two heavy flavor jets and
missing energy may indicate the decay of a second (third) generation leptoquark
to a charm (bottom) quark and a neutrino. As the data is found to be consistent
with Standard Model expectations, mass limits are determined.


title:
Implementation of the Dead-Time Free F1 TDC in the COMPASS Detector
  Readout

abstract:
  In the scope of the COMPASS experiment a multi-purpose, high rate capable TDC
with digitisation width of 60 ps has been developed. The integration into the
readout system and the flexible input of the CATCH readout driver is presented.


title: TAC Proposal for Fundamental and Applied Research

abstract:
  Main parameters of linac-ring type $phi$ factory and 1-5 GeV energy proton
synchrotron proposed in the framework of the Turkic Accelerator Complex (TAC)
Project are discussed


title:
Measurements of Inclusive and Exclusive B Decays to Charmonium with
  BABAR

abstract:
  Using 8.5M B-anti-B events recorded by the BABAR detector the yield of
inclusive J/psi, the branching ratios of psi(2S) and chi_C1 are presented.
Combining the charmonium state with either a K+,KS, K*+ or K*0 exclusive B
decays are reconstructed and their branching ratios determined. Using the fully
reconstructed decays, both the B0 and B+ masses and their difference is
measured. Finally the contributions of CP even and odd amplitudes in the decay
B to J/psi K* are determined from an angular analysis.


title: DIRC, the Particle Identification System for BABAR

abstract:
  The DIRC, a novel type of Cherenkov ring imaging device, is the primary
hadronic particle identification system for the BABAR detector at the
asymmetric B-factory, PEP-II at SLAC. BABAR began taking data with colliding
beams mode in late spring 1999. This paper describes the performance of the
DIRC during the first 16 months of operation.


title: A study of bB production mechanisms in Pythia

abstract:
  The influence of the Pt_hat cutoff on the production of bB events in Pythia
has been studied. Versions 5.75, 6.115 and 6.152 have been considered.


title: Hadron-hadron and hadron-nuclei collisions at high energies

abstract:
  A brief review is made of the present situation of hadron-hadron and
hadron-nuclei total elastic and inelastic cross sections at high energies


title: Search for B+ -> K+ l+ l- and B0 -> K*0 l+ l-

abstract:
  Using a sample of 3.7 x 10^6$ Upsilon(4S) -> B Bbar events collected with the
BaBar detector at the PEP-II storage ring, we search for the electroweak
penguin decays B+ -> K+ e+ e-, B+ -> K+ mu+ mu-, B0 -> K*0 e+ e-, and B0 -> K*0
mu+ mu-. We observe no significant signals for these modes and set preliminary
90% C.L. upper limits of Br(B+ -> K+ e+ e-) < 12.5 x 10^(-6), Br(B+ -> K+ mu+
mu-) < 8.3 x 10^(-6), Br(B0 -> K*0 e+ e-) < 24.1 x 10^(-6), and Br(B0 -> K*0
mu+ mu-) < 24.5 x 10^(-6).


title:
First Measurement of the Branching Fraction of the Decay psi(2S) --> tau
  tau

abstract:
  The branching fraction of the psi(2S) decay into tau pair has been measured
for the first time using the BES detector at the Beijing Electron-Positron
Collider. The result is $B_{\tau\tau}=(2.71\pm 0.43 \pm 0.55) \times 10^{-3}$,
where the first error is statistical and the second is systematic. This value,
along with those for the branching fractions into e+e- and mu+mu of this
resonance, satisfy well the relation predicted by the sequential lepton
hypothesis. Combining all these values with the leptonic width of the resonance
the total width of the psi(2S) is determined to be $(252 \pm 37)$ keV.


title: Latest Results on Weak Semi-Leptonic Hyperon Decays in KTeV

abstract:
  The KTeV experiment at Fermilab has finished its $\Xi^0$ semi-leptonic decay
analysis from the 1997 run and presented here are the final numbers for the
branching ratio and form factors. A new run with three times the statistics was
taken in 1999 and a first look at the data shows the quality and consistency of
the results, predicting a similar improvement in these measurements.


title: The Experiment Road to the Heavier Quarks and Other Heavy Objects

abstract:
  After a brief history of heavy quarks, I will discuss charm, bottom, and top
quarks in turn. For each one, I discuss its first observation, and then what we
have learned about production, hadronization, and decays - and what these have
taught us about the underlying physics. I will also point out remaining open
issues. For this series of lectures, the charm quark will be emphasized. It is
the first of the heavy quarks, and its study is where many of the techniques
and issues first appeared. Only very brief mention is made of CP violation in
the bottom-quark system since that topic is the subject of a separate series of
lectures by Gabriel Lopez. As the three quarks are reviewed, a pattern of
techniques and lessons emerges. These are identified, and then briefly
considered in the context of anticipated physics signals of the future; e.g.,
for Higgs and SUSY particles.


title: Bounds on the CP Asymmetry in $b\to s\gamma$ Decays

abstract:
  We have measured the CP asymmetry A_CP = [BF(b -> s gamma) - BF(bbar -> sbar
gamma)]/ [BF(b -> s gamma) + BF(bbar -> sbar gamma)] to be A_CP = (-0.079 +/-
0.108 +/- 0.022)(1.0 +/- 0.030), implying that, at 90% confidence level, A_CP
lies between -0.27 and +0.10. These limits rule out some extreme non-Standard
Model predictions, but are consistent with most, as well as with the Standard
Model.


title: First Year of the BABAR Experiment Data Taking

abstract:
  The BABAR experiment at the PEP-II asymmetric B factory observed its first
hadronic events on the 26th of May 1999. We present the progress made so far on
the data taking, the BABAR detector performances and the physics analyses.


title: Recent results from SND detector at VEPP-2M

abstract:
  The current status of experiments with SND detector at VEPP-2M $e^+e^-$
collider in the energy range $2E_0=0.4-1.4$ GeV is given. The new results of
analysis of $\phi$ decay into $\pi^0\pi^0\gamma$, $\eta\pi^0\gamma$ are based
on the full SND statistics corresponding 20 million of $\phi$ decay. New
measurement of $\omega\to\pi^0\pi^0\gamma$ decay and a first observation of
$\rho\to\pi^0\pi^0\gamma$ are presented. The accuracy of many other rare decays
of light vector mesons was improved. In the energy range $2E_0=1.0\div1.4$ GeV
the cross sections of the processes $e^+e^-\to\omega\pi^0$ and
$e^+e^-\to\pi^+\pi^-\pi^0$ were measured. The results of the fitting of data
are discussed.


title: Measurement of Charmed Meson Lifetimes with Belle

abstract:
  The lifetimes of charmed mesons have been measured using 2.75fb$^{-1}$ 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 $\tau(D^0)=(414.8\pm3.8\pm3.4)$ fs,
$\tau(D^+)=(1040^{+23}_{-22}\pm18)$ fs and
$\tau(D_s^+)=(479^{+17}_{-16}{}^{+6}_{-8})$ fs, where the first error is
statistical and the second error is systematic. The mixing parameter $y_{CP}$
is also measured through the lifetime difference of $D^0$ mesons decaying into
CP-mixed states and CP eigenstates. We find
$y_{CP}=(1.0^{+3.8}_{-3.5}{}^{+1.1}_{-2.1})%$, corresponding to a 95%
confidence interval $-7.0%<\ycp<8.7%$.


title:
Measurements of Diffractive Vector-Meson Photoproduction at High
  Momentum Transfer from the ZEUS Experiment at HERA

abstract:
  We discuss recent preliminary results on the diffractive photoproduction of
{\rhoz}, $\phi$, and {\jpsi} mesons at high momentum transfer reported by the
ZEUS collaboration at HERA. A special-purpose calorimeter served to tag the
quasi-real photons ($\qsq<0.01 \gevsq$) in the process $\gamma + p \to {\rm
VM}+ Y$, where $Y$ represents a dissociated state of the proton. The resulting
range in photon-proton center-of-mass energy extends from 80 to 120 \gev. The
differential cross sections $\frac{\D\sigma}{\D t}$ were obtained in the region
${\abst}>1.2 \gevsq$, where $t$ denotes the squared momentum transfer to the
proton. The measurements provide good sensitivity to the observed power-law
dependence $\frac{\D\sigma}{\D t} \propto {(-t)}^{-n}$. Over the region in
momentum transfer covered by the data, the power is found to be approximately
$n\simeq 3$ for {\rhoz} and $\phi$ photoproduction, and approximately $n\simeq
2$ for {\jpsi} photoproduction.


title: Observation of New States Decaying into $\Lambda_{c}^{+}\pi^{-}\pi^{+}$

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


title:
A Water \v{C}erenkov Calorimeter as the Next Generation Neutrino
  Detector

abstract:
  We propose here a large homogeneous calorimeter as the next generation
neutrino detector for $\nu$ factories and/or conventional $\nu$ beams. The
active media is chosen to be water for obvious economical reasons. The \v
Cerenkov light produced in water is sufficient to have good energy resolution,
and the pattern recognition is realized by a modular water tank structure.
Monte Carlo simulations demonstrate that the detector performance is excellent
for identifying neutrino CC events while rejecting background events.


title:
Observation of the Askaryan Effect: Coherent Microwave Cherenkov
  Emission from Charge Asymmetry in High Energy Particle Cascades

abstract:
  We present the first direct experimental evidence for the charge excess in
high energy particle showers predicted nearly 40 years ago by Askaryan. We
directed bremsstrahlung photons from picosecond pulses of 28.5 GeV electrons at
the SLAC Final Focus Test Beam facility into a 3.5 ton silica sand target,
producing electromagnetic showers several meters long. A series of antennas
spanning 0.3 to 6 GHz were used to detect strong, sub-nanosecond radio
frequency pulses produced whenever a shower was present. The measured electric
field strengths are consistent with a completely coherent radiation process.
The pulses show 100% linear polarization, consistent with the expectations of
Cherenkov radiation. The field strength versus depth closely follows the
expected particle number density profile of the cascade, consistent with
emission from excess charge distributed along the shower. These measurements
therefore provide strong support for experiments designed to detect high energy
cosmic rays and neutrinos via coherent radio emission from their cascades.


title: Studies of hadronic decays of Z0 bosons at SLD

abstract:
  The latest SLD results on light-quark fragmentation and tests of
hadronisation models are presented


title: Results on B to Charmonia Decays from CLEO

abstract:
  We review some recent results on B to charmonia decays from CLEO based on 9.7
BBbar pairs collected with the CLEO detector. These include measurements of
B^{0} to J\Psi K^0_s, \chi_{c1} K^0_s and J/\Psi \pi^0 branching fractions,
search for direct CP violation in B^{\pm} to J/\Psi K^\pm and \Psi(2S) K^\pm,
observation of B \to \eta_{c} K, study of \chi_{c1}, \chi_{c2} production and
measurement of the relative branching fraction of \Upsilon(4S) to charged and
neutral B meson pairs.


title:
Search for the Supersymmetric Partner of the Top-Quark in $p \bar{p}$
  Collisions at $\sqrt{s} = 1.8 {\rm TeV}$

abstract:
  We report on a search for the supersymmetric partner of the top quark (stop)
produced in $t \bar{t}$ events using $110 {\rm pb}^{-1}$ of $p \bar{p}$
collisions at $\sqrt{s} = 1.8 {\rm TeV}$ recorded with the Collider Detector at
Fermilab. In the case of a light stop squark, the decay of the top quark into
stop plus the lightest supersymmetric particle (LSP) could have a significant
branching ratio. The observed events are consistent with Standard Model $t
\bar{t}$ production and decay. Hence, we set limits on the branching ratio of
the top quark decaying into stop plus LSP, excluding branching ratios above 45%
for a LSP mass up to 40 {\rm GeV/c}$^{2}$.


title: Beyond the Standard Model at Tevatron

abstract:
  This article presents recent results of searches for physics beyond the
Standard Model using the CDF and the D$\not$O detector at the Fermilab Tevatron
Collider. All results shown correspond to analysis performed using the past
1992-1996 Fermilab Tevatron run I data (roughly $100$ $pb^{-1}$ per each
experiment). In particular we describe recent Tevatron searches for scalar top
in the $b+\ell+$missing-$E_{T}$ channel, for squark and gluinos using like-sign
dileptons (LS), for large extra space-time dimensions and the search for
leptoquarks and technicolor in the missing-$E_{T}$+heavy flavour jet events.
Tight limits on the existence of such models have been set.


title:
A study of B0-anti-B0 oscillations with full reconstructed B mesons with
  the BABAR detector

abstract:
  Time-dependent B0-anti-B0 flavor oscillations are studied in e+e-
annihilation data collected with the BABAR detector at center-of-mass energies
near the Upsilon(4S) resonance. We report a preliminary result for the
time-dependent B0-anti-B0 oscillation frequency, Delta_md = 0.512 +/- 0.017 +/-
0.022 hbar ps^{-1}.


title: B lifetime measurements with exclusively reconstructed B decays

abstract:
  Data collected with the BABAR detector at the PEP-II asymmetric B Factory at
SLAC are used to study the lifetime of the B0 and B+ mesons. The data sample
consists of 7.4 fb-1 collected near the Y(4S) resonance. B0 and B+ mesons are
fully reconstructed in several exclusive hadronic decay modes to charm and
charmonium final states. The B lifetime are determined from the flight length
difference between the two B mesons. The preliminary measurements of the
lifetimes are tau_{B0} = 1.506 +/- 0.052 (stat) +/- 0.029 (syst) ps tau_{B+} =
1.602 +/- 0.049 (stat) +/- 0.035 (syst) ps and of their ratio is
tau_{B+}/tau_{B0} = 1.065 +/- 0.044 (stat) +/- 0.021 (syst).


title:
Search for R-Parity Violating Decays of Supersymmetric Particles in e+e-
  Collisions at Centre-of-Mass Energies from 189GeV to 202GeV

abstract:
  Searches for the production of supersymmetric particles under the assumption
that R-parity is violated via a single dominant LLE, LQD or UDD coupling were
performed. These use the data collected by the ALEPH detector at LEP at
centre-of-mass energies from 188.6 to 201.6 GeV. The numbers of candidate
events observed in the data are consistent with Standard Model expectations.
Upper limits on the production cross sections and lower limits on the masses of
charginos, sleptons, squarks and sneutrinos are derived.


title: Report of the Working Group on Precision Measurements

abstract:
  In the first part of this report, we discuss the prospects for measuring the
W mass and width in Run II. The basic techniques used to measure M_W are
described and the statistical, theoretical and detector-related uncertainties
are discussed in detail. Alternative methods of measuring the W mass at the
Tevatron and the prospects for M_W measurements at other colliders are also
described. In the second part, we discuss the measurement of the forward
backward asymmetry in Drell Yan production in Run II which can be used to
determine the effective weak mixing angle. Estimates of the statistical and
systematic uncertainties in Run II are given. The third part summarizes the
features of the FORTRAN package GAPP which performs a fit to the electroweak
observables and extracts the probability distribution function of the Higgs
boson mass.


title:
Preliminary BABAR results on B0 mixing with dileptons and on lifetime
  with partially reconstructed B0 decays

abstract:
  With an integrated luminosity of 7.7 fb-1 collected on resonance by BABAR at
the PEP-II asymmetric B Factory, we measure the difference in mass between the
neutral B eigenstates, Delta(m_d), to be (0.507+/-0.015+/-0.022)x 10^{12} hbar
s^{-1} with dileptons events and present preliminary results for the B^0
lifetime, tau(B^0) = 1.55+/-0.05+/-0.07 ps and tau(B^0) = 1.62+/-0.02+/-0.09 ps
obtained from partial reconstruction of the two B^0 decay processes
respectively B^0-->D^{*-}pi^+ and B^0-->D^{*-} l^+ nu_l.


title:
Measurement of Orthopositronium Decay Rate Using SiO2 Powder:
  Integration of Thermalization into Time Spectrum

abstract:
  The intrinsic decay rate of orthopositronium (o-Ps) formed in SiO_2 powder
was measured using a modified method which determined the time dependence of
the pick-off annihilation rate using high-energy-resolution germanium
detectors. That is, the main systematic error due to thermalization was
accounted for and integrated into the time spectrum fitting procedure. The
averaged value was found to be lambda_(o-Ps)=7.0399+0.0020-0.0021(stat.)
+-0.0015(sys.) mu s^{-1}, which agrees well with the O(alpha^2) QED prediction;
varying 2.8-4.2 experimental standard deviations from other measurements.


title:
Jet energy scale setting with "photon+Jet" events at LHC energies.
  Generalities, selection rules

abstract:
  "photon+Jet" events, based on the q~q-> g+photon and qg-> q+photon
subprocesses, are proposed for jet energy scale setting and hadron calorimeter
calibration at LHC energies. General features and selection criteria of
"photon+Jet" events that would provide a good photon Pt - jet Pt balance are
described. CMS detector geometry is taken as the basement.


title:
Jet energy scale setting with "photon+Jet" events at LHC energies. Event
  rates, Pt structure of jet

abstract:
  In this paper the study of "photon+Jet" events is continued, aimed at jet
energy scale setting and hadron calorimeter calibration at LHC energies. The
event number distribution over Pt and pseudorapidity eta in the barrel region
of the photon is presented. The features of "photon+Jet" events in CMS detector
|eta|<1.4 are exposed. Pt structure of the region in the eta-phi space inside
and beyond jet is also shown.


title:
Jet energy scale setting with "photon+Jet" events at LHC energies.
  Selection of events with a clean "photon+Jet" topology and photon Pt - jet Pt
  disbalance

abstract:
  It is shown in the paper that Pt activity limitation (modulus of the vector
sum) of all particle beyond "photon+Jet" system Pt^out leads to the noticeable
photon Pt - jet Pt disbalance decreasing. On a simultaneous restriction of the
cluster Pt and Pt^out from above it is possible to reach an acceptable balance
between photon Pt - jet Pt with a sufficient number of the photon Pt - jet Pt
events for the jet energy scale setting and hadron calorimeter calibratiom of
the CMS detector at LHC.


title:
"photon+Jet" events rate estimation for gluon distribution determination
  at LHC

abstract:
  It is shown that "photon+Jet" events, being collected at LHC, would provide
us with the data sufficient for an extraction of gluon distribution function in
a proton using valence and s quark distributions measured in the same
experiment with another physical proces A new region of 10^{-4}< x < 10^{-1}
with 1.6x10^3< Q^2<10^5 ~(GeV/c)^2 can be covered. The rates of g c-> photon
+Jet events are also given.


title: SUSY Searches at Tevatron Collider

abstract:
  This article presents recent results of searches for Supersymmetry using the
CDF and the D$\not$O detector at the Fermilab Tevatron Collider. Described are
the Tevatron searches for third generation scalar quarks and for supersymmetric
signatures involving photons. All the reported results have been obtained
assuming theoretical models in which $\mathcal{R}$-parity is conserved.


title:
Jet energy scale setting with "Gamma+Jet" events at LHC energies.
  Detailed study of the background suppression

abstract:
  The possibilities of the background events suppression, based on the QCD
subprocesses of qg-, gg-, qq- scattering with big cross sections, to the signal
\gpj events are studied. Basing on the introduced selection criteria, the
background suppression factors and signal events selection efficiencies and the
number of the events, that can be collected at LHC with low luminosity
L=10^{33}cm^2 s^{-1} during one month of continuous work, are determined.


title: Studies of Charmless Two-Body, Quasi-Two-Body and Three-Body B Decays

abstract:
  Preliminary results are presented on a search for several exclusive charmless
hadronic B decays, from data collected by the BABAR detector near the
Upsilon(4S) resonance. These include two-body decay modes h^{+/-}h^{-/+}
three-body decay modes with final states h^{+/-}h^{-/+}h^{+/-} and
h^{+/-}h^{-/+}\pi^0, and quasi-two-body decay modes with final states X^0 h and
X^0 K_s^0, where h = pi or K and X^0 = eta^prime or omega. The measurement of
branching fractions for four decay modes, and upper limits for nine modes are
presented.


title:
Kinematic Fit for the Radiative Bhabha Calibration of BaBar's
  Electromagnetic Calorimeter

abstract:
  For the radiative Bhabha calibration of BaBar's electromagnetic calorimeter,
the measured energy of a photon cluster is being compared with the energy
obtained via a kinematic fit involving other quantities from that event. The
details of the fitting algorithm are described in this note, together with its
derivation and checks that ensure that the fitting routine is working properly.


title: Charm Hadroproduction at Fermilab E769

abstract:
  E769 has just recorded on tape the interactions of 500 million pions, kaons,
and protons. A Cerenkov counter and a TRD were used to tag beam particle types
in both positive and negative 250 GeV/c hadron beams. Thin foil Be, Al, Cu, and
W targets were used with a spectrometer including silicon microstrips to look
for charm decay vertices. Preliminary results show D0 --> K- pi+ and D+ --> K-
pi+ pi+ mass peaks. As the event reconstruction progresses on numerous parallel
microprocessors, we intend to explore the pT, xF, A, and flavor dependence of
the production of charmed mesons and baryons.


title: Search for CP violation at CLEO

abstract:
  Recent results from CLEO on the search for CP violation in beauty and charm
meson decays are reviewed.


title: Charged Multiplicities in Z Decays into u, d, and s Quarks

abstract:
  About 4.4 million hadronic decays of Z bosons, recorded by the OPAL detector
at LEP at a centre-of-mass energy of around sqrt(s) = 91.2 GeV, are used to
determine the mean charged particle multiplicities for the three light quark
flavours. Events from primary u, d, and s quarks are tagged by selecting
characteristic particles which carry a large fraction of the beam energy. The
charged particle multiplicities are measured in the hemispheres opposite to
these particles. An unfolding procedure is applied to obtain these
multiplicities for each primary light quark flavour. This yields <n_u> = 17.77
+- 0.51 +0.86 -1.20,
  <n_d> = 21.44 +- 0.63 +1.46 -1.17,
  <n_s> = 20.02 +- 0.13 +0.39 -0.37, where statistical and systematic errors
are given. The results for <n_u> and <n_d> are almost fully statistically
anti-correlated. Within the errors the result is consistent with the flavour
independence of the strong interaction for the particle multiplicities in
events from the light up, down, and strange quarks.


title: The Future of Diffraction at Tevatron

abstract:
  This paper summarizes the main current upgrade for Diffractive Physics at
Tevatron. We describe both CDF and D0 new devices that are being installed
around the CDF and D0 area that will allow to produce new results in
Diffractive Physics.


title: First CP Violation Results from BABAR

abstract:
  We present a preliminary measurement of time-dependent CP-violating
asymmetries in B^0-->J/psi K_S and B^0-->psi(2S) K_S decays recorded by the
BABAR detector at the PEP-II asymmetric B Factory at SLAC. The data sample
consists of 9.0 fb-1 collected at the Upsilon(4S) resonance and 0.8 fb-1
off-resonance. One of the neutral B mesons, produced in pairs at the
Upsilon(4S), is fully reconstructed. The flavor of the other neutral B meson is
tagged at the time of its decay, mainly with the charge of identified leptons
and kaons. The time difference between the decays is determined by measuring
the distance between the decay vertices. Wrong-tag probabilities and the time
resolution function are measured with samples of fully-reconstructed
semileptonic and hadronic neutral B final states. The value of the asymmetry
amplitude, sin(2*beta), is determined from a maximum likelihood fit to the time
distribution of 120 tagged B^0-->J/psi K_S and B^0-->psi(2S) K_S candidates:
sin(2*beta) = 0.12+/-0.37(stat)+/-0.09(syst).


title: First Neutrino Observations from the Sudbury Neutrino Observatory

abstract:
  The first neutrino observations from the Sudbury Neutrino Observatory are
presented from preliminary analyses. Based on energy, direction and location,
the data in the region of interest appear to be dominated by 8B solar
neutrinos, detected by the charged current reaction on deuterium and elastic
scattering from electrons, with very little background. Measurements of
radioactive backgrounds indicate that the measurement of all active neutrino
types via the neutral current reaction on deuterium will be possible with small
systematic uncertainties. Quantitative results for the fluxes observed with
these reactions will be provided when further calibrations have been completed.


title: Observation of the conversion decay $\phi\to\pi^0e^+e^-$ at CMD-2

abstract:
  Using 15.1^{-1} of data collected by CMD-2 in the $\phi$-meson energy range,
the branching ratio of the conversion decay $\phi\to\pi^0e^+e^-$ has been
measured for the first time: B(\phi\to\pi^0e^+e^-) = (1.22 \pm 0.34 \pm 0.21)
\cdot 10 ^{-5}.


title: Neutrino Physics: An Experimental Overview

abstract:
  The field of neutrino physics is currently very exciting, with several recent
results pointing to new physics. I will give an overview of the current
experimental situation, focusing primarily on neutrino oscillation results. The
data are not entirely consistent however, and puzzles remain. I will then
review the new experiments which are poised to solve the outstanding puzzles.


title: The Belle Silicon Vertex Detector

abstract:
  The silicon vertex detector of the Belle experiment has been built to provide
the vertex information of $B$ meson decays at the KEKB accelerator. Performance
during the initial data taking period and a brief description of the upgrade
plan are also presented.


title: The e p -> e' p eta reaction at and above the S11(1535) baryon resonance

abstract:
  New cross sections for the reaction e p -> ep eta are reported for total
center of mass energy W = 1.5--1.86 GeV and invariant momentum transfer Q^2 =
0.25--1.5 GeV^2. This large kinematic range allows extraction of important new
information about response functions, photocouplings, and eta N coupling
strengths of baryon resonances. Expanded W coverage shows sharp structure at W
\~ 1.7 GeV; this is shown to come from interference between S and P waves and
can be interpreted in terms of known resonances. Improved values are derived
for the photon coupling amplitude for the S11(1535) resonance.


title:
Observation of Polarization in Bottomonium Production at sqrt(s)=38.8
  GeV

abstract:
  We present a measurement of the polarization observed for bottomonium states
produced in p-Cu collisions at sqrt(s)=38.8 GeV. The angular distribution of
the decay dimuons of the Upsilon(1S) state show no polarization at small xF and
pT but significant positive transverse production polarization for either pT >
1.8 GeV/c or for xF > 0.35. The Upsilon(2S+3S) unresolved states show a large
transverse production polarization at all values of xF and pT measured. These
observations are compared with an NRQCD calculation that predicts a transverse
polarization in bottomonium production arising from quark-antiquark fusion and
gluon-gluon fusion diagrams.


title: Charmless Hadronic B Decays at BABAR

abstract:
  We present preliminary results of several searches for rare charmless
hadronic decays of the B meson using data collected by the BABAR detector at
the Stanford Linear Accelerator Center's PEP-II storage ring. We search for the
decays h^+h^-, h^+h^-h^+, h^+h^-pi^0, X^0h^+, and X^0 K_S^0, where h = pi or K,
and X^0 = eta^prime or omega. In a sample of 8.8 million B-anti-B decays we
measure the branching fractions: BF(B^0 --> pi^+pi^-) =
(9.3^{+2.6}_{-2.3}^{+1.2}_{-1.4}) x 10^{-6}, BF(B^0 --> K^+pi^-) =
(12.5^{+3.0}_{-2.6}^{+1.3}_{-1.7}) x 10^{-6}, BF(B^0 --> rho^-pi^+) = (49 +/-
13^{+6}_{-5}) x 10^{-6}$, and BF(B^+ --> eta^prime K^+) = (62 +/- 18 +/- 8) x
10^{-6}$. We calculate upper limits for the modes without a significant signal.


title: Recent Results from BES

abstract:
  We report partial wave analysis results for $J/\psi \to \gamma K^+ K^-$ based
on $7.8 \times 10^6$ BESI $J/\psi$ events, and find $0^{++}$ to be dominant in
the $f_J(1710)$ mass region. Some very preliminary results are presented from
the $2.2 \times 10^7$ $J/\psi$ events newly collected at the upgraded
BES(BESII). Using the world largest $\psi(2S)$ data sample, BES measures
branching ratios of $\psi(2S)$ radiative and hadronic decays. The preliminary R
values measured by BESII in the 2-5 GeV energy region are also presented.


title:
Prospects for CP-violation searches in the future experiment with
  RF-separated K+/- beam at U-70

abstract:
  The first description of the experimental program "OKA" with RF-separated
K+/- beam at Protvino U-70 PS is presented. The parameters of the beam as well
as the potential for CP-violation searches are discussed.


title: Open Charm and Beauty Production at HERA

abstract:
  Selected new results from the H1 and ZEUS collaborations on $ep$ interactions
at 300 - 318 GeV centre-of-mass energy are presented. The full pre-upgrade
integrated luminosity of HERA of 110 pb$^{-1}$ is used. Charm cross sections
are measured up to high values of $x_B$ and $Q^2$ and are found to be well
described by NLO QCD in the 3 flavour scheme. Orbitally excited $D$ mesons are
observed; radial excitations are searched for, but are not seen. The first $b$
cross section measurement is confirmed with a lifetime based method,
establishing the excess over NLO QCD.


title:
Light resonances in Ks K pi and eta pi pi final states in gamma gamma
  collisions at LEP

abstract:
  The e+e- -> e+e- Ks K+- pi-+ e+e- -> e+e- eta pi+ pi- and final states are
studied with the L3 detector at LEP using data collected at centre-of-mass
energies from 183 GeV up to 202 GeV. The mass spectrum of the Ks K+- pi-+ final
state shows an enhancement around 1470MeV, which is identified with the
pseudoscalar meson eta(1440). This state is observed in gamma gamma collisions
for the first time and its two-photon width is measured to be Gamma_gamma
gamma(eta(1440))x BR(eta(1440)->KK pi)= 212 +/- 50(stat) +/- 23(sys)eV. Clear
evidence is also obtained for the formation of the axial vector mesons f1(1420)
and f1(1285). In the eta pi+ pi- channel the f1(1285) is observed, and upper
limits for the formation of eta(1440) and eta(1295) are obtained.


title: Inclusive Jet Production in pbar p Collisions

abstract:
  We report a new measurement of the pseudorapidity (eta) and transverse-energy
(Et) dependence of the inclusive jet production cross section in pbar b
collisions at sqrt(s) = 1.8 TeV using 95 pb**-1 of data collected with the
DZero detector at the Fermilab Tevatron. The differential cross section
d^2sigma/dEt deta is presented up to |eta| = 3, significantly extending
previous measurements. The results are in good overall agreement with
next-to-leading order predictions from QCD and indicate a preference for
certain parton distribution functions.


title:
K0s K0s Final State in Two-Photon Collisions and Implications for
  Glueballs

abstract:
  The K0s K0s final state in two-photon collisions is studied with the L3
detector at LEP. The mass spectrum is dominated by the formation of the
f_2'(1525) tensor meson in the helicity-two state with a two-photon width times
the branching ratio into K Kbar of 76 +- 6 +- 11 eV. A clear signal for the
formation of the f_J(1710) is observed and it is found to be dominated by the
spin-two helicity-two state. No resonance is observed in the mass region around
2.2 GeV and an upper limit of 1.4 eV at 95% C.L. is derived for the two-photon
width times the branching ratio into K0s K0s for the glueball candidate
xi(2230).


title: Neutral Hyperon and H-Dibaryon Results from KTeV

abstract:
  Results from the KTeV experiment at Fermilab using neutral Xi hyperons are
presented, especially the first form-factor (FF) measurement from its
semi-leptonic decay. This decay, which is an important test of the Standard
Model, was observed for the first time using the 1997 KTeV experiment. We also
report on the analysis of a large samples of neutral Xi weak radiative decays,
and a search for the decay of a lightly bound $H^0$ dibaryon.


title:
Recent Results from the K2K (KEK-to-Kamioka) Neutrino Oscillation
  Experiment

abstract:
  The latest results of the K2K experiment are reported. The results are based
on data taken from June, 1999, to June, 2000, corresponding to a total $2.6
\cdot 10^{19}$ protons on target. Twenty seven fully-contained events in the
22.5 kton fiducial volume of Super-Kamiokande (SK) are observed. The expected
number of events is estimated to be 40.3^{+4.7}_{-4.6} assuming the null
oscillations hypothesis.


title: $B_s$ Mixing at SLD

abstract:
  We set a preliminary 95% C.L. exclusion on the oscillation frequency of
$B_s^0 - \bar{B_s^0}$ mixing using a sample of 400,000 hadronic $Z^0$ decays
collected by the SLD experiment at the SLC during the 1996-98 run. Three
analyses are presented in this paper. The first analysis partially reconstructs
the $B_s^0$ by combining a fully reconstructed $D_s$ with the remaining charged
B decay tracks. The second analysis selects a sample of events with a partially
reconstructed charm vertex and a lepton track. The third analysis reconstructs
b-hadrons topologically and exploits the $b \to c$ cascade charge structure to
determine the flavor of the b-hadron at decay. All three analyses take
advantage of the large forward-backward asymmetry of the polarized $Z^0 \to b
\bar{b}$ decays and information in the hemisphere opposite to the reconstructed
B vertex to determine the b-hadron flavor at production. The results of the
three analyses are combined to exclude the following values of the $B_s^0 -
\bar{B_s^0}$ oscillation frequency: $\Delta m_s < 7.6 ps^{-1}$ and $11.8 <
\Delta m_s < 14.8 ps^{-1}$ at the 95% confidence level.


title:
Time Dependent $B_s^0 - \bar{B_s^0}$ Oscillations Using Exclusively
  Reconstructed $D_s^+$ Decays at SLD

abstract:
  We set a preliminary 95% C.L. exclusion on the oscillation frequency of
$B_s^0 - \bar{B_s^0}$ mixing using a sample of 400,000 hadronic $Z^0$ decays
collected by the SLD experiment at the SLC during the 1996-98 run. In this
analysis, $B_s^0$ mesons are partially reconstructed by combining a fully
reconstructed $D_s$ with other $B_s^0$ decay tracks. The $D_s$ decays are
reconstructed via the $\phi \pi$ and $K^* K$ channels. The $b$-hadron flavor at
production is determined by exploiting the large forward-backward asymmetry of
polarized $Z^0 \to b \bar{b}$ decays as well as information from the hemisphere
opposite to the reconstructed B decay. The flavor of the $B_s^0$ at the decay
vertex is determined by the charge of the $D_s$. A total of 361 candidates
passed the final event selection cuts. This analysis excludes the following
values of the $B_s^0 - \bar{B_s^0}$ mixing oscillation frequency: $\Delta m_s <
1.5$ ps$^{-1}$, $2.6 < \Delta m_s < 4.9$ ps$^{-1}$, and $10.8 < \Delta m_s <
13.5$ ps$^{-1}$ at the 95% confidence level.


title:
Dalitz plot analysis and branching fraction measurement of D+ and Ds+ ->
  pi+pi-pi+

abstract:
  Fermilab fixed target experiment E791 obtained a sample of $1172 \pm 61$
events of $D^+ \to \pi^- \pi^+ \pi^+$ and 848 $\pm 44$ events of $D_s^+ \to
\pi^- \pi^+ \pi^+$ decays. We find respectively $B (D^+ \to \pi^- \pi^+ \pi^+)
/ B (D^+
  \to K^- \pi^+ \pi^+) = 0.0311 \pm 0.0018 ^
  {+0.0016}_{-0.0026}$ and $B(D_s^+ \to \pi^+ \pi^- \pi^+)
  / B(D_s^+ \to \phi \pi^+) = 0.245 \pm 0.028^{+0.019}_{-0.012}$. Using a
coherent amplitude analysis to fit the Dalitz plot of the $D^+ \to \pi^- \pi^+
  \pi^+$ decay, we find strong evidence for a scalar resonance of mass
$478^{+24}_{-23}
  \pm 17 $MeV/$c^2$ and width $324^{+42}_{-40} \pm 21$
  MeV/$c^2$, compatible with what is expected for the isoscalar meson $\sigma$
>. The $D^+ \to \sigma(500)
  \pi^+$ fraction accounts for approximately half of all three-charged-pion
decays of the $D^+$ . From the Dalitz plot analysis of the $D_s^+ \to \pi^-
\pi^+ \pi^+$ decay events, we find significant contributions from the channels
$\rho^0(770)\pi^+$, $\rho^0(1450)\pi^+$,
  $f_0(980)\pi^+$, $f_2(1270)\pi^+$, and $f_0(1370)\pi^+$. We also present new
measurement of the masses and widths of the isoscalar resonances $f_0(980)$ and
$f_0(1370)$.


title: Higgs Candidates in e+e- Interactions at root(s) = 206.6 GeV

abstract:
  In a search for the Standard Model Higgs boson, carried out on 212.5 pb-1 of
data collected by the L3 detector at the highest LEP centre-of-mass energies,
including 116.5 pb-1 above root(s) = 206GeV, an excess of candidates for the
process e+e- -> Z* -> HZ is found for Higgs masses near 114.5GeV. We present an
analysis of our data and the characteristics of our strongest candidates.


title: Results on Charmed Meson Spectroscopy from Focus

abstract:
  We report the preliminary measurement by the FOCUS Collaboration (E831 at
Fermilab) of masses and widths of the L=1 charm mesons D_2^{*0} and D_2^{*+}.


title:
Observation of an Excess in the Search for the Standard Model Higgs
  Boson at ALEPH

abstract:
  A search has been performed for the Standard Model Higgs boson in the data
sample collected with the ALEPH detector at LEP, at centre-of-mass energies up
to 209GeV. An excess of 3sigma beyond the background expectation is found,
consistent with the production of the Higgs boson with a mass near 114GeV/c2.
Much of this excess is seen in the four-jet analyses, where three high purity
events are selected.


title: Prescise measurement of jet energies with the ZEUS detector

abstract:
  A method to correct the jet transverse energy has been developed for the ZEUS
detector which attains an uncertainty better than 3%. The procedure is based on
a combination of tracking and calorimeter information that optimises the
resolution of reconstructed kinematic variables. The selected calorimeter
clusters and tracks are referred to as Energy Flow Objects (EFOs). The
conservation of energy and momentum in neutral current deep inelastic $e^+p$
scattering events is exploited to determine the required energy corrections by
balancing the scattered positron with the hadronic final state. The method has
been applied to data and simulated events independently. The corrected EFOs are
used as input to a $k_T$-cluster jet algorithm to reconstruct the jets and to
determine kinematic variables. In addition, the corrected EFOs allow an
improved measurement of the internal structure of a jet.


title:
Search for Supersymmetric Particles in e+e- Collisions at sqrt(s) up to
  202GeV and Mass Limit for the Lightest Neutralino

abstract:
  Searches for pair production of squarks, sleptons, charginos, and neutralinos
are performed with the data collected by the ALEPH detector at LEP at
centre-of-mass energies from 188.6 to 201.6 GeV. No evidence for any such
signals is observed in a total integrated luminosity of about 410pb-1. The
negative results of the searches are translated into exclusion domains in the
space of the relevant MSSM parameters, which improve significantly on the
constraints set previously. Under the assumptions of gaugino and sfermion mass
unification, these results allow a 95% C.L. lower limit of 37GeV/c2 to be set
on the mass of the lightest neutralino for any tan beta and sfermion mass.
Additional constraints in the MSSM parameter space are derived from the
negative results of ALEPH searches for Higgs bosons. The results are also
interpreted in the framework of minimal supergravity.


title:
Limits on radiative decays of solar neutrinos from a measurement during
  a solar eclipse

abstract:
  A search for possible radiative decays of solar neutrinos with emission of
photons in the visible range was performed during the total solar eclipse of
August 11, 1999. Due to very bad weather conditions our two telescopes were
unable to collect useful data; fortunately we obtained several video camera
images from a local TV station. An analysis of the digitised images is
presented and limits on the lifetime for radiative decay are discussed.


title: Measurement of the $\Lambda_{c}^{+}$ Lifetime

abstract:
  The $\Lambda_{c}^{+}$ lifetime is measured using 9.0 fb$^{-1}$ of $e^+e^-$
annihilation data collected on or just below the $\Upsilon(4S)$ resonance with
the CLEO II.V detector at CESR. Using an unbinned maximum likelihood fit, the
$\Lambda_{c}^{+}$ lifetime is measured to be $(179.6 \pm 6.9(stat.) \pm
4.4(syst.))$ fs. The precision of this colliding beam measurement is comparable
to other measurements, which are based on fixed target experiments with
different systematic errors.


title: Diffractive Vector Meson Production at HERA

abstract:
  The H1 and ZEUS collaborations at HERA report new data on the diffractive
production of vector mesons with a many-fold increase of luminosity compared to
previous measurements. The new data include photoproduction and
electroproduction of $\rho^0,\phi,J/\psi$. The available data on elastic VM
production indicate that the interaction scales as $Q^2+M_{V}^2$.


title: D^0-$\bar D^0$ Mixing and CP Violation from FOCUS Experiment

abstract:
  Measurement results on $D^0$-$\bar D^0$ mixing and CP violation are
presented. FOCUS, a fixed target experiment at Fermilab, collected a high
statistics photo-produced charm sample collected during the 96-97 run. We
reconstructed more than 1 million charmed particles and compared the lifetimes
of two $D^0$ meson decays to $K^-\pi^+$ and $K^-K^+$. The mixing parameter,
$y_{\rm cp}$, we obtained is $(3.42\pm 1.39\pm 0.74)%$. We also searched CP
asymmetries in $D^+\to K^-K^+\pi^+$, $D^0\to K^-K^+$ and $D^0\to \pi^-\pi^+$
decay modes. We did not see any evidence of CP violation by comparing the decay
rates for particle and antiparticle.


title: A Study of Bs Meson Oscillation Using Ds-Lepton Correlations

abstract:
  From data collected around the Z resonance by the OPAL detector at LEP, a
sample of Bs decays was obtained using Ds^-l^+ combinations, where the Ds^- was
fully reconstructed in the phi pi-, K*0K- and Ks0K- decay channels or partially
reconstructed in the phi l- nu (X) decay channel. These events were used to
study Bs oscillation. The flavor (b or bbar) at decay was determined from the
lepton charge while the flavor at production was determined from a combination
of techniques. The expected sensitivity of the experiment is 4.1 ps-1. The
experiment was not able to resolve the oscillatory behavior, and we deduced
that the Bs oscillation frequency Delta m_s > 1.0 ps-1 at the 95% confidence
level.


title: Hybrid Pixel Detector Development for the Linear Collider Vertex Tracker

abstract:
  In order to fully exploit the physics potential of the future high energy
e+e- linear collider, a Vertex Tracker able to provide particle track
extrapolation with very high resolution is needed. Hybrid Si pixel sensors are
an attractive technology due to their fast read-out capabilities and radiation
hardness. A novel pixel detector layout with interleaved cells has been
developed to improve the single point resolution. Results of the
characterisation of the first processed prototypes by electrostatic
measurements and charge collection studies are discussed.


title: First Results in Exclusive Radiative Penguin Decays at BABAR

abstract:
  We present a preliminary measurement of the branching fraction of the
exclusive penguin decay B^0 -> K^*0 gamma using (8.6+/-0.3) x 10^6 B-anti-B
decays BF(B^0 -> K^*0 gamma) = (5.2+/-0.82 (stat.) +/- 0.47 (sys.)) x 10^-5. In
addition we search for the related penguin decays with a lepton pair in the
final state, B^+ -> K^+ l^+l^-, B^0 -> K^*0 l^+l^-. We find no evidence for
these decays in 3.7+/-0.1 x 10^6 B-anti-B decays and set preliminary 90% C.L
upper limits of BF(B^+ -> K^+ e^+ e^-) < 12.5 x 10^{-6}, BF(B^+ -> K^+ mu^+
mu^-) < 8.3 x 10^{-6}, BF(B^0 -> K^*0 e^+ e^-) < 24.1 x 10^{-6}, BF(B^0 -> K^*0
mu^+ mu^-) < 24.5 x 10^{-6}.


title: New FOCUS results on charm mixing and CP violation

abstract:
  We present a summary of recent results on CP violation and mixing in the
charm quark sector based on a high statistics sample collected by
photoproduction experiment FOCUS (E831 at Fermilab). We have measured the
difference in lifetimes for the $D^0$ decays: $D^0 \to K^-\pi^+$ and $D^0 \to
K^-K^+$. This translates into a measurement of the $y_{CP}$ mixing parameter in
the $\d0d0$ system, under the assumptions that $K^-K^+$ is an equal mixture of
CP odd and CP even eigenstates, and CP violation is negligible in the neutral
charm meson system. We verified the latter assumption by searching for a CP
violating asymmetry in the Cabibbo suppressed decay modes $D^+ \to
K^-K^+\pi^+$, $D^0 \to K^-K^+$ and $D^0 \to \pi^-\pi^+$. We show preliminary
results on a measurement of the branching ratio $\Gamma(D^{*+}\to \pi^+
(K^+\pi^-))/\Gamma(D^{*+}\to \pi^+ (K^-\pi^+))$.


title: QCD measurements in photon-photon collisions at LEP

abstract:
  An overview of the latest results of the LEP collaborations on QCD
measurements in photon-photon collisions is presented, including measurements
of the total hadronic cross-section, the production of heavy quarks and dijets
and the structure functions of real and virtual photons.


title: Kernel Estimation in High-Energy Physics

abstract:
  Kernel Estimation provides an unbinned and non-parametric estimate of the
probability density function from which a set of data is drawn. In the first
section, after a brief discussion on parametric and non-parametric methods, the
theory of Kernel Estimation is developed for univariate and multivariate
settings. The second section discusses some of the applications of Kernel
Estimation to high-energy physics. The third section provides an overview of
the available univariate and multivariate packages. This paper concludes with a
discussion of the inherent advantages of kernel estimation techniques and
systematic errors associated with the estimation of parent distributions.


title: Inclusive Particle Production at LEP

abstract:
  New results on inclusive production of Sigma^- and Lambda(1520) and on proton
production in quark and gluon jets are presented. These results are based on 2
million hadronic Z decays collected with the DELPHI detector at LEP. They are
compared with the results of other LEP experiments and with models. It has been
shown that the total production rates of all light-flavour hadrons measured so
far at LEP 1 follow phenomenological laws related to the spin, isospin,
strangeness and mass of the particles. A significant proton enhancement in
gluon jets is observed, indicating that baryon production proceeds directly
from colour objects.


title: The diffractive structure function at the Tevatron: CDF results

abstract:
  Results on hard diffraction from CDF are reviewed with emphasis on the
determination of the diffractive structure function of the (anti)proton from
single diffractive and double Pomeron exchange dijet production. Comparison of
the diffractive dijet results with predictions based on diffractive deep
inelastic scattering at HERA shows a breakdown of conventional QCD
factorization. A similar breakdown is observed within the CDF results in
comparing the structure functions obtained from single diffraction and double
Pomeron exchange.


title: Diffraction in hadron-hadron interactions

abstract:
  Results on soft and hard diffraction in $pp$ and $\bar pp$ collisions are
reviewed with emphasis on factorization and scaling properties of differential
cross sections. While conventional factorization breaks down at high energies,
a scaling behavior emerges, which leads to a universal description of
diffractive processes in terms of a (re)normalized rapidity gap probability
distribution.


title: Momentum Reconstruction and Triggering in the TALAS Detector

abstract:
  A neural network solution for a complicated experimental High Energy Physics
problem is described. The method is used to reconstruct the momentum and charge
of muons produced in collisions of particle in the ATLAS detector. The
information used for the reconstruction is limited to the output of the outer
layer of the detector, after the muons went through strong and inhomogeneous
magnetic field that have bent their trajectory. It is demonstrated that neural
network solution is efficient in performing this task. It is shown that this
mechanism can be efficient in rapid classification as required in triggering
systems of the future particle accelerators. The parallel processing nature of
the network makes it relevant for hardware realization in the ATLAS triggering
system.


title:
Vertex Reconstructing Neural Network at the ZEUS Central Tracking
  Detector

abstract:
  An unconventional solution for finding the location of event creation is
presented. It is based on two feed-forward neural networks with fixed
architecture, whose parameters are chosen so as to reach a high accuracy. The
interaction point location is a parameter that can be used to select events of
interest from the very high rate of events created at the current experiments
in High Energy Physics. The system suggested here is tested on simulated data
sets of the ZEUS Central Tracking Detector, and is shown to perform better than
conventional algorithms.


title:
Nonmesonic decay of the Lambda-hyperon in hypernuclei produced by p+Au
  collisions

abstract:
  The lifetime of the Lambda-hyperon for the nonmesonic decay Lambda N ---> N N
has been determined by a measurement at COSY Juelich of the delayed fission of
heavy hypernuclei produced in proton - Au collisions at T_p=1.9 GeV. It is
found that heavy hypernuclei with mass numbers A= 180 +- 5 and atomic numbers
Z= 74 +-2 fission with a lifetime
  130ps +- 13ps (stat.) +- 15ps (syst.) . This value together with the results
obtained for other heavy hypernuclei in previous investigations indicates (on
the confidence level of 0.9) a violation of the phenomenological Delta I = 1/2
rule for Lambda N ---> NN transitions as known from the weak mesonic decays of
kaons and hyperons. PACS:
  {13.30.-a}{Decays of baryons}
  {13.75.Ev}{Hyperon-nucleon interaction}
  {21.80}{Hypernuclei}
  {25.80.Pw}{Hyperon-induced reactions}


title: The CRESST Experiment: Recent Results and Prospects

abstract:
  The CRESST experiment seeks hypothetical WIMP particles that could account
for the bulk of dark matter in the Universe. The detectors are cryogenic
calorimeters in which WIMPs would scatter elastically on nuclei, releasing
phonons. The first phase of the experiment has successfully deployed several
262 g sapphire devices in the Gran Sasso underground laboratories. A main
source of background has been identified as microscopic mechanical fracturing
of the crystals, and has been eliminated, improving the background rate by up
to three orders of magnitude at low energies, leaving a rate close to one count
per day per kg and per keV above 10 keV recoil energy. This background now
appears to be dominated by radioactivity, and future CRESST scintillating
calorimeters which simultaneously measure light and phonons will allow
rejection of a great part of it.


title: Dalitz Analysis of the Decay $D^{0}\to K^{-}\pi^{+}\pi^{0}$

abstract:
  We use data collected with the CLEO II detector to perform a high-statistics
measurement of the resonant substructure in $D^0 \to K^-\pi^+\pi^0$ decays. We
find the Dalitz Plot is well represented by a combination of seven
quasi-two-body decay channels ($\bar{K}^{*0} \pi^0$, $K^- \rho$, $K^{*-}
\pi^+$, $K^*_0(1430)^-\pi^+$, $\bar{K}^*_0(1430)^0 \pi^0$, $K^- \rho^+(1700)$,
and $K^*(1680)^- \pi^+$), plus a small non-resonant component. Using the
amplitudes and phases from this analysis, we calculate an integrated CP
asymmetry of $-0.031 \pm 0.086$.


title: Exclusive Measurements in B to D^* N Nbar X

abstract:
  We report the first observation of exclusive decays of the type B to D^* N
Nbar X, where N is a nucleon. Using a sample of 9.7 x 10^6 BBbar pairs
collected with the CLEO detector operating at the Cornell Electron Storage
Ring, we measure the branching fractions B(B^0 to D^*-p pbar pi^+) =
(6.5+1.3-1.2 +-1.0) x 10^-4, and B(B^0 to D^*- p nbar) = (14.5+3.4-3.0 +-2.7) x
10^-4. The charge conjugate process is implied in the reconstruction of B^0 to
D^*- p nbar, only the mode with the antineutron is used in our measurement
because neutrons do not have a distinctive annihilation signature.
  Antineutrons are used for the first time in the exclusive reconstruction of a
B meson. By finding conclusive evidence for the existence of decay modes of the
type B to D N Nbar X, we challenge the assumption that the B to Baryons rate is
dominated by decays to charmed mesons.


title:
A Quasi-Model-Independent Search for New Physics at Large Transverse
  Momentum

abstract:
  We apply a quasi-model-independent strategy ("Sleuth") to search for new high
p_T physics in approximately 100 pb^-1 of ppbar collisions at sqrt(s) = 1.8 TeV
collected by the DZero experiment during 1992-1996 at the Fermilab Tevatron.
Over thirty-two e mu X, W+jets-like, Z+jets-like, and 3(lepton/photon)X
exclusive final states are systematically analyzed for hints of physics beyond
the standard model. Simultaneous sensitivity to a variety of models predicting
new phenomena at the electroweak scale is demonstrated by testing the method on
a particular signature in each set of final states. No evidence of new high p_T
physics is observed in the course of this search, and we find that 89% of an
ensemble of hypothetical similar experimental runs would have produced a final
state with a candidate signal more interesting than the most interesting
observed in these data.


title:
Search for Excited Leptons in e+ e- Interactions at sqrt(s)=192 - 202
  GeV

abstract:
  Excited leptons are searched for using the L3 detector at LEP. The data
collected at centre-of-mass energies in the range from 192 up to 202 GeV
correspond to a total luminosity of 233 pb^(-1). No evidence of either pair
production of excited leptons, nor of single production is found. From the
searches for pair produced excited leptons, lower mass limits close to the
kinematic limit are set. From the searches for singly produced excited leptons,
upper limits on their couplings are derived in the mass range up to 200 GeV.


title: The Power of Confidence Intervals

abstract:
  We consider the power to reject false values of the parameter in Frequentist
methods for the calculation of confidence intervals. We connect the power with
the physical significance (reliability) of confidence intervals for a parameter
bounded to be non-negative. We show that the confidence intervals (upper
limits) obtained with a (biased) method that near the boundary has large power
in testing the parameter against larger alternatives and small power in testing
the parameter against smaller alternatives are physically more significant.
Considering the recently proposed methods with correct coverage, we show that
the physical significance of upper limits is smallest in the Unified Approach
and highest in the Maximum Likelihood Estimator method. We illustrate our
arguments in the specific cases of a bounded Gaussian distribution and a
Poisson distribution with known background.


title:
Measurements of the Cross Sections for Open Charm and Beauty Production
  in gamma gamma Collisions at root(s)=189-202 GeV

abstract:
  The production of c and b quarks in gamma-gamma collisions is studied with
the L3 detector at LEP with 410 pb^-1 of data, collected at centre-of-mass
energies from 189 GeV to 202 GeV. Hadronic final states containing c and b
quarks are identified by detecting electrons or muons from their semileptonic
decays. The cross sections sigma(e+e- -> e+e- c c~ X) and sigma(e+e- -> e+e- b
b~ X) are measured and compared to next-to-leading order perturbative QCD
calculations. The cross section of b production is measured in gamma-gamma
collisions for the first time. It is in excess of the QCD prediction by a
factor of three.


title: A Quasi-Model-Independent Search for New High p_T Physics at DZero

abstract:
  We apply a quasi-model-independent strategy ("Sleuth") to search for new high
p_T physics in approximately 100 pb^-1 of ppbar collisions at sqrt(s) = 1.8 TeV
collected by the DZero experiment during 1992-1996 at the Fermilab Tevatron. We
systematically analyze many exclusive final states and demonstrate sensitivity
to a variety of models predicting new phenomena at the electroweak scale. No
evidence of new high p_T physics is observed.


title: Preliminary Results on Charmed Meson Spectroscopy

abstract:
  We report the preliminary measurement by the FOCUS Collaboration (E831 at
Fermilab) of masses and widths of the L=1 charm mesons $D_2^{*0}$ and
$D_2^{*+}$. The fit of the invariant mass distribution requires an additional
term to account for a broad structure over background.


title:
A Measurement of the Decay Asymmetry Parameters in $\Xi_{c}^{0}\to
  \X^{-}\pi^{+}$

abstract:
  Using the CLEO II detector at the Cornell Electron Storage Ring we have
measured the $\Xi_c^{0}$ decay asymmetry parameter in the decay $\Xi_c^{0} \to
\Xi^{-} \pi^+$. We find $\alpha_{\Xi_c^{0}} \alpha_{\Xi} = 0.26 \pm
0.18{(stat)}^{+0.05}_{-0.04}{(syst)}$, using the world average value of
$\alpha_{\Xi} = -0.456 \pm 0.014$ we obtain $\alpha_{\Xi_c^{0}} = -0.56 \pm
0.39{(stat)}^{+0.10}_{-0.09}{(syst)}$. The physically allowed range of a decay
asymmetry parameter is $-1<\alpha<+1$. Our result prefers a negative value:
$\alpha_{\Xi_c^{0}}$ is $<0.1$ at the 90% CL. The central value occupies the
middle of the theoretically expected range but is not yet precise enough to
choose between models.


title: Importance of Future Hyperon Beta Decay Experiments

abstract:
  Recent results from the KTeV experiment at Fermilab using $\Xi^0$ hyperons
have enabled a great leap in improving our understanding of elementary particle
physics, especially with the first form-factor measurement from the
semi-leptonic decay $\Xi^0 \to \Sigma^+ e^- \bar{\nu}$. This decay is a test of
whether the standard model contains all of the needed parameters to fully
describe hyperon beta decay. It was observed for the first time only in 1997
even though its importance had been explicitly stated in 1961 by the early
theories of the standard model as formulated by N. Cabibbo. We have the ability
to improve this measurement substantially by making the definitive form-factor
measurement with a sample of 30,000 such decays from a forthcoming experiment,
which will either show or rule out the existence any additional second class
weak currents, an obviously important measurement allowing particle physics to
finally put this question to rest. We also have the ability to make a
measurement of hyperon compositeness by measuring the charged $\Sigma^{\pm}$
beta decay into $\Lambda^0$, and in addition to search for mass coupling terms
in hyperon beta decays where the muon replaces the electron, important for
determining the $g_3$ and $f_3$ form-factors. These are the important questions
to answer in studying strange baryon decays, and are reviewed in this article.


title: Beam Test of BTeV Pixel Detectors

abstract:
  The silicon pixel vertex detector is one of the key elements of the BTeV
spectrometer. Detector prototypes were tested in a beam at Fermilab. We report
here on the measured spatial resolution as a function of the incident angles
for different sensor-readout electronics combinations. We compare the results
with predictions from our Monte Carlo simulation.


title:
Measurement of Delta-md Using a Probability Based Same-Side Tagger at
  CDF

abstract:
  A measurement of Delta m_d is performed using inclusive lepton+vertex events
at CDF. A probability based Same-Side Tagger was developed to tag the initial
b-flavor of the B^0_d, which suppresses tagging on B-decay products. We find
Delta m_d = 0.42 +/- 0.09 +/- 0.03 ps^-1.


title:
Search for Rare and Forbidden Charm Meson Decays D0--> V l+ l- and h h l
  l

abstract:
  We report the results of a search for flavor-changing neutral current,
lepton-flavor, and lepton-number violating decays of the 3 and 4-body decay
modes of D0 (and its antiparticle) containing muons and electrons. Using data
from Fermilab charm hadroproduction experiment E791, we examine modes with two
leptons and either a Rho(0), Kstar, or Phi vector meson or a non-resonant Pi
Pi, K Pi, or K K pair of pseudoscalar mesons. No evidence for any of these
decays is found. Therefore, we present branching-fraction upper limits at 90%
confidence level for the 27 decay modes examined (18 new).


title: A QCD Survey: 0 < Q**2 < 10**5 Gev**2

abstract:
  Selected, recent results, primarily from collider experiments but including
some fixed target experiments, are presented as a survey of Quantum
Chromodynamics (QCD). The concepts of leading order and next-to-leading order
QCD are introduced. Inclusive proton-antiproton jet and dijet production and
deep inelastic electron-proton scattering at very large momentum transfer are
shown to be in good agreement with perturbative QCD (pQCD). Dijet, three-jet
and multi-jet results from proton-antiproton, electron-proton, and
electron-electron colliders at moderate Q**2 are also compared to pQCD. BFKL
searches from all three colliders are discussed. Recent measurements of
structure functions and contributions to the parton distribution functions are
presented. New measurements of the strong coupling constant are summarized, the
world average is 0.1184 with an uncertainty of 0.0031.


title: Search for Rare 3 and 4-Body D0 Decays at FNAL E791

abstract:
  Limits at the 10**-4 level are reported for rare and forbidden decays of the
D0 charm meson to a pair of leptons and either a vector meson or two
pseudoscalar mesons. Of these searches, 18 are investigations of decays without
previous published results; several others have significantly improved
sensitivity over previous results.


title: A Luminosity Spectrometer for the Zeus Experiment at HERA

abstract:
  The HERA luminosity upgrade is expected to generate two major problems in the
current method of luminosity determination which is based on counting
brehmsstrahlung photons: damage of the calorimeter monitor due to high primary
synchrotron radiation and large multiple event (pile-up) corrections. The
luminosity spectrometer presented in this talk, is a novel method that reduces
the impact of these problems in the luminosity measurement and is expected to
yield a total systematic uncertainty of 1.4%. The spectrometer counts
brehmsstrahlung photon conversions in the beam pipe exit window using two small
calorimeters (former ZEUS beam pipe calorimeters) symmetrically placed away
from the synchrotron radiation plane. The photon conversion rate is measured by
counting electron-positron (ep) coincidences in the calorimeters. The ep
acceptance is measured using a third calorimeter (6 meter tagger) which tags
the brehmsstrahlung electrons. The electron-positron pair is separated by a
small dipole magnet.


title: Measurement of open beauty production in photoproduction at HERA

abstract:
  The production and semi-leptonic decay of heavy quarks have been studied in
the photoproduction process $e^+p -> e^+ + {dijet} + e^- + X with the ZEUS
detector at HERA using an integrated luminosity of 38.5 ${\rm pb^{-1}}$. Events
with photon-proton centre-of-mass energies, $W_{\gamma p}$, between 134 and 269
GeV and a photon virtuality, Q^2, less than 1 ${\rm GeV^2}$ were selected
requiring at least two jets of transverse energy $E_T^{\rm jet1(2)} >7(6)$ GeV
and an electron in the final state. The electrons were identified by employing
the ionisation energy loss measurement. The contribution of beauty quarks was
determined using the transverse momentum of the electron relative to the axis
of the closest jet, $p_T^{\rm rel}$. The data, after background subtraction,
were fit with a Monte Carlo simulation including beauty and charm decays. The
measured beauty cross section was extrapolated to the parton level with the b
quark restricted to the region of transverse momentum $p_T^{b} > p_T^{\rm min}
=$ 5 GeV and pseudorapidity $|\eta^{b}| <$ 2. The extrapolated cross section is
$1.6 \pm 0.4 (stat.)^{+0.3}_{-0.5} (syst.) ^{+0.2}_{-0.4} (ext.) {nb}$. The
result is compared to a perturbative QCD calculation performed to
next-to-leading order.


title:
Search for a Higgs Boson Decaying into Two Photons with the L3 Detector
  at LEP

abstract:
  A search is performed for a Higgs boson, decaying into two photons, using the
L3 data collected at centre of mass energies between $\sqrt s$ = 189 and 202
GeV, corresponding to an integrated luminosity of 400 pb$^{-1}$. The processes
$e^{+}e^{-}\to {Zh} \to {q} \bar{q} \gamma \gamma $, $e^{+}e^{-}\to {Zh} \to
\nu \bar{\nu} \gamma \gamma $, $e^{+}e^{-}\to {Zh} \to {l}^{+} {l}^{-} \gamma
\gamma $ are considered. The observed data are found to be consistent with the
expected background from standard physics processes. Limits on the branching
fraction of the Higgs boson decay into two photons as a function of the Higgs
mass are shown and a lower mass limit on a fermiophobic Higgs is derived.


title: Measurement of the B0 and B- meson lifetimes in ALEPH

abstract:
  The lifetimed of the Bbar0 and B- meson lifetimes are measured using data
recorded on the Z peak with the ALEPH detector at LEP. An improved analysis
based on partially reconstructed Bbar0 -> D*+l-nubar and B- -> D0l-nubar decays
is presented.


title:
Jet energy scale setting with "photon+Jet" events at LHC energies.
  Minijets and cluster suppression and photon Pt - jet Pt disbalance

abstract:
  In this paper the study of "photon+Jet" events is continued and the event
number determination useful for jet energy scale setting with the possible CMS
detector hadron calorimeter calibration at LHC is fulfiled. The sources of
photon Pt and jet Pt disbalance are exposed. It is shown that the cluster Pt
limitation, which is found in an event outside of the jet, can be a good
criterion for this disbalance decreasing.


title:
Study of gamma gamma Background in e+e- -> W+W- nu nu -> H nu nu Events
  at the Tesla e+e- Linear Collider

abstract:
  The effect of the overlap of gamma gamma -> hadrons to H nu nu events has
been studied for the case of the Tesla e+e- linear collider at 350 GeV. It was
found that, due to the significant bunch length and the track extrapolation
accuracy provided by the Vertex Tracker, the gamma gamma background to physics
events can be substantially reduced, with moderate loss in reconstruction
efficiency, by a combination of kinematical and vertex topology observables.
The remaining background, being confined to very forward hadron production,
does not significantly interfere with the event reconstruction.


title: The 115 GeV Higgs Odyssey

abstract:
  On his way home from Troy, Odysseus had arrived within reach of Ithaca when a
great storm blew up. He was swept away, and only several years later was he
able to return to reclaim his rights from the rapacious suitors, with the aid
of his son Telemachus. Some wonder whether this epic is repeating itself, if
the Higgs weighs 115 GeV. If so, are CMS and ATLAS cast in the role of
Telemachus? In this paper, I first discuss how close to Ithaca LEP may have
been, the fact that a 115 GeV Higgs boson would disfavour technicolour, its
potential implications for supersymmetry, and finally the prospects for
completing the Higgs Odyssey.


title:
Search for R-parity Violating Decays of Supersymmetric Particles in e+e-
  Collisions at root(s)=189GeV

abstract:
  A search for chargino, neutralino and scalar lepton pair-production in e+e-
collisions at the centre-of-mass energy of 189 GeV is performed under the
assumptions that R-parity is not conserved in decays and only one of the
coupling constants lambda_ijk, lambda'_ijk or lambda''_ijk is non-negligible.
No signal is found in a data sample corresponding to an integrated luminosity
of 176.4 pb-1. Limits on the production cross sections, on the Minimal
Supersymmetric Standard Model parameters and on the masses of the
supersymmetric particles are derived.


title: Top Production Properties at the Tevatron

abstract:
  Following the confirmation of the top quark discovery at the Tevatron, the
next step is to begin studying its properties. Because the scale of electroweak
symmetry breaking is of the same order as the measured top mass, the top quark
may be very sensitive to new physics. We describe measurements of the total
top-antitop cross section, the top-antitop invariant mass, the top transverse
momentum distribution, and single top production from Run 1 data at D0 and CDF.
All of these measurements will become more precise in Run 2.


title: Search for Mixing and CP Violation in Charm Decays

abstract:
  Standard model mixing and CP violation are expected to be small in the charm
sector. Some argue that only in the presence of new physics do we currently
expect to observe these effects. Fermilab experiment E791 has the largest
sample of reconstructed charm decays recorded to date. We have made an
exhaustive search for D0 D0-bar mixing and CP violation in this data. We
present the charm mixing limits on the mixing parameter r_mix using hadronic
and semileptonic decays, and also present preliminary limits on the CP
asymmetry parameter, A_CP, for Cabibbo suppressed decays.


title:
Measurement of B0d - B0d-bar mixing rate from the time evolution of
  dilepton events at the Upsilon(4S)

abstract:
  We report a determination of the B0d - B0d-bar mixing parameter Delta-m_d
based on the time evolution of dilepton yields in Upsilon(4S) decays. The
measurement is based on a 5.9 /fb data sample collected by the Belle detector
at KEKB. The proper-time difference distributions for same-sign and
opposite-sign dilepton events are simultaneously fitted to an expression
containing Delta-m_d as a free parameter. Using both muons and electrons, we
obtain Delta-m_d = 0.463 +- 0.008(stat.) +- 0.016(sys.) ps^{-1} This is the
first determination of Delta-m_d from time evolution measurements at the
Upsilon(4S). We also place limits on possible CPT violations.


title:
Measurement of negative particle multiplicity in S-Pb collisions at 200
  GeV/c per nucleon with the NA36 TPC

abstract:
  A high statistics study of the negative multiplicity distribution from S-Pb
collisions at 200 GeV/c per nucleon is presented. The NA36 TPC was used to
detect charged particles; corrections are based upon the maximum entropy
method.


title:
Production Properties of the Orbitally Excited Mesons f_0(980),
  f_2(1270), K^*0_2(1430) and f'_2(1525) in Z^0 Hadronic Decays

abstract:
  DELPHI results are presented on the inclusive production of the neutral
mesons rho^0, f_0(980), f_2(1270), K^*0_2(1430) and f'_2(1525) in hadronic Z^0
decays. They are based on about 2 million multihadronic events collected in
1994 and 1995, using the particle identification capabilities of the DELPHI
Ring Imaging Cherenkov detectors and measured ionization losses in the Time
Projection Chamber. The total production rates per hadronic Z^0 decay have been
determined to be: 1.19 +/- 0.10 for rho^0; 0.164 +/- 0.021 for f_0(980); 0.214
+/- 0.038 for f_2(1270); 0.073 +/- 0.023 for K^*0_2(1430); and 0.012 +/- 0.006
for f'_2(1525). The total production rates for all mesons and differential
cross-sections for the rho^0, f_0(980) and f_2(1270) are compared with the
results of other LEP experiments and with models.


title: First Observation of the decay KL -> pi0 e e gamma

abstract:
  We report on the first observation of the decay KL -> pi0 ee gamma by the
KTeV E799 experiment at Fermilab. Based upon a sample of 48 events with an
estimated background of 3.6 +/- 1.1 events, we measure the KL -> pi0 ee gamma
branching ratio to be (2.34 +/- 0.35 +/- 0.13)x10^{-8}. Our data agree with
recent O(p^6) calculations in chiral perturbation theory that include
contributions from vector meson exchange through the parameter a_V. A fit was
made to the KL -> pi0 ee gamma data for a_V with the result -0.67 +/- 0.21 +/-
0.12, which is consistent with previous results from KTeV.


title:
A First Measurement of Low x Low Q^2 Structure Functions in Neutrino
  Scattering

abstract:
  A new structure function analysis of CCFR deep inelastic nu-N and nubar-N
scattering data is presented for previously unexplored kinematic regions down
to Bjorken x=0.0045 and Q^2=0.3 GeV^2. Comparisons to charged lepton scattering
data from NMC and E665 experiments are made and the behavior of the structure
function F2_nu is studied in the limit Q^2 -> 0.


title: Recent Structure Function Results from CCFR

abstract:
  A new structure function analysis of CCFR deep inelastic nu-N and nubar-N
scattering data is presented for previously unexplored kinematic regions down
to Bjorken x=0.0045 and Q^2=0.3 GeV^2. Comparisons to charged lepton scattering
data from NMC and E665 experiments are made and the behavior of the structure
function F2_nu is studied in the limit Q^2 -> 0


title: B decays to Ds^(*) and D^*

abstract:
  The e+e- annihilation data recorded with the BABAR detector has been used to
study B^0 decays to Ds^(*)+ and D^*-$ mesons. The production fraction of
inclusive Ds^(*)+ and the corresponding momentum spectra have been determined.
Exclusive decays B^0 --> D^*- Ds^(*)+ have been identified with a partial
reconstruction technique and their branching ratios have been measured. Fully
reconstructed B^0 decays in the hadronic modes B^0 --> D^*- pi+ andB^0 --> D^*-
rho+ have been also studied and the measurement of their absolute branching
fractions is reported.


title: Rare Decay Results from KTeV and (rho,eta)_{CKM}

abstract:
  Rare decay results from KTeV are reviewed, emphasizing modes that in
principle provide information about the CKM matrix. Our recent results in
lepton flavor violating modes are also presented.


title:
Differential cross section measurement of eta photoproduction on the
  proton from threshold to 1100 MeV

abstract:
  The differential cross section for the reaction p(gamma, eta p) has been
measured from threshold to 1100 MeV photon laboratory energy. For the first
time, the region of the S11(1535) resonance is fully covered in a
photoproduction experiment and allows a precise extraction of its parameters at
the photon point. Above 1000 MeV, S-wave dominance vanishes while a P-wave
contribution is observed whose nature will have to be clarified. These high
precision data together with the already measured beam asymmetry data will
provide stringent constraints on the extraction of new couplings of baryon
resonances to the eta meson.


title: Jet Flavour Identification at the CLIC Multi-TeV e+e- Collider

abstract:
  Jet flavour identification in multi-TeV e+e- collisions is expected to
provide insights on new phenomena at scales beyond those probed by the LHC. The
anticipated high track density and jet collimation represent a new challenge to
jet tagging algorithms. A method, based on the sampling of the jet charged
multiplicity, sensitive to the long decay length and large decay multiplicity
of heavy flavour hadrons is proposed and the expected performances for the
tagging of e+e- -> bb events at 3 TeV are discussed.


title: Physics results from BABAR and prospects

abstract:
  The BABAR experiment has been taking data since about one year. Physics
results, complementary to those described by G.Sciolla elsewhere in these
Proceedings, are presented: various measurements of the neutral and charged B
mesons lifetimes, the B^0 mixing frequency, the mistag fractions, and the B -->
D_s^(*) X and B^0 --> D_s^(*)+ D^* branching ratios. Some prospects for the
close future are shown. All the numbers given here are preliminary.


title: Review of Heavy-Quark Production at Fixed-Target Experiments

abstract:
  An increasingly large amount of quality fixed-target data on heavy-quark
production at fixed-target energies is appearing. This data can provide
information across a range of physics topics. The topics vary from
investigations of QCD predictions to the understanding of the structure of
hadrons. Recent results on neutrino, photon, and hadron production of charm and
beauty will be reviewed in this context. The greatest insight will come from
combining multiple measurements as they relate to the physics topics, and by
ensuring that the parameters used in models are consistent with all the
measurements. We have not yet really entered the time when this has been done
for fixed-target measurements.


title: A new limit on the permanent electric dipole moment of ^{199}Hg

abstract:
  We present the first results of a new search for a permanent electric dipole
moment of the ^{199}Hg atom using a UV laser. Our measurements give d(Hg)= -
(1.06 +/- 0.49 +/- 0.40) 10^{-28} e cm. We interpret the result as an upper
limit |d(Hg)| < 2.1 10^{-28} e cm (95% C.L.), which sets new constraints on
theta_{QCD}, chromo-EDMs of the quarks, and CP violation in Supersymmetric
models.


title: Lorentz Angle Measurement for CO2/Isobutane Gas Mixtures

abstract:
  We have developed a Lorentz angle measurement system for cool gas mixtures in
the course of our R&D for a proposed JLC central drift chamber (JLC-CDC). The
measurement system is characterized by the use of two laser beams to produce
primary electrons and flash ADCs to read their signals simultaneously. With
this new system, we have measured Lorentz angles for CO2/isobutane gas mixtures
with different proportions (95:5, 90:10, and 85:15), varying drift field from
0.6 to 2.0 kV/cm and magnetic field up to 1.5 T. The results of the measurement
are in good agreement with GARFIELD/MAGBOLTZ simulations.


title: Application of Neural Networks for Energy Reconstruction

abstract:
  The possibility to use Neural Networks for reconstruction of the energy
deposited in the calorimetry system of the CMS detector is investigated. It is
shown that using feed - forward neural network, good linearity, Gaussian energy
distribution and good energy resolution can be achieved. Significant
improvement of the energy resolution and linearity is reached in comparison
with other weighting methods for energy reconstruction.