title:
Emulsion Chamber with Big Radiation Length for Detecting Neutrino
  Oscillations

abstract:
  A conceptual scheme of a hybrid-emulsion spectrometer for investigating
various channels of neutrino oscillations is proposed. The design emphasizes
detection of $\tau$ leptons by detached vertices, reliable identification of
electrons, and good spectrometry for all charged particles and photons. A
distributed target is formed by layers of low-Z material,
emulsion-plastic-emulsion sheets, and air gaps in which $\tau$ decays are
detected. The tracks of charged secondaries, including electrons, are
momentum-analyzed by curvature in magnetic field using hits in successive thin
layers of emulsion. The $\tau$ leptons are efficiently detected in all major
decay channels, including \xedec. Performance of a model spectrometer, that
contains 3 tons of nuclear emulsion and 20 tons of passive material, is
estimated for different experimental environments. When irradiated by the
$\nu_\mu$ beam of a proton accelerator over a medium baseline of $<L/E_\nu >
\sim 1$ km/GeV, the spectrometer will efficiently detect either the \omutau and
\omue transitions in the mass-difference region of $\Delta m^2 \sim 1$ eV$^2$,
as suggested by the results of LSND. When exposed to the neutrino beam of a
muon storage ring over a long baseline of $<L/E_\nu > \sim$ 10-20 km/GeV, the
model detector will efficiently probe the entire pattern of neutrino
oscillations in the region $\Delta m^2 \sim 10^{-2}-10^{-3}$ eV$^2$, as
suggested by the data on atmospheric neutrinos.


title: The Physical Significance of Confidence Intervals

abstract:
  We define some appropriate statistical quantities that indicate the physical
significance (reliability) of confidence intervals in the framework of both
Frequentist and Bayesian statistical theories. We consider the expectation
value of the upper limit in the absence of a signal (that we propose to call
"exclusion potential", instead of "sensitivity" as done by Feldman and Cousins)
and its standard deviation, we define the "Pull" of a null result, expressing
the reliability of an experimental upper limit, and the "upper and lower
detection functions", that give information on the possible outcome of an
experiment if there is a signal. We also give a new appropriate definition of
"sensitivity", that quantifies the capability of an experiment to reveal the
signal that is searched for at the given confidence level.


title: Analytical and Numerical Flash-Algorithms for Track Fits

abstract:
  Flash-algorithm track-reconstruction routines with speed factors 3000-4000 in
excess those of traditional iterative routines are presented.
  The methods were successfully tested in the alignment of the Test Beam setup
for the ATLAS Pixel Detector
  MCM-D modules yielding a
  60 fold increase in alignment resolution over iterative routines, for the
same amount of alocated CPU time.


title: Charm Results on CP Violation and Mixing

abstract:
  The most recent results on CP violation and mixing in the charm system are
reviewed as a guide to the future. While no surprising results are reported so
far, charm provides a unique window to physics beyond the Standard Model. The
results reported here come from four sources: ALEPH at LEP, E791 and FOCUS/E831
at Fermilab, and CLEO II.V at CESR. Results beyond these sources may be
expected as a byproduct of B-motivated experiments.


title:
Solar panels as air Cherenkov detectors for extremely high energy cosmic
  rays

abstract:
  Increasing interest towards the observation of the highest energy cosmic rays
has motivated the development of new detection techniques. The properties of
the Cherenkov photon pulse emitted in the atmosphere by these very rare
particles indicate low-cost semiconductor detectors as good candidates for
their optical read-out.
  The aim of this paper is to evaluate the viability of solar panels for this
purpose. The experimental framework resulting from measurements performed with
suitably-designed solar cells and large conventional photovoltaic areas is
presented.
  A discussion on the obtained and achievable sensitivities follows.


title: Measurements of R_b, A_FB^b and A_FB^c in e+e- Collisions at 130-189 GeV

abstract:
  The cross-section ratio Rb=sigma(e+e- to b-antib)/sigma(e+e- to q-antiq) and
the bottom and charm forward-backward asymmetries AFB^b and AFB^c are measured
using event samples collected by the OPAL detector at centre-of-mass energies
between 130 and 189 GeV. Events with bottom quark production are selected with
a secondary vertex tag, and a hemisphere charge algorithm is used to extract
AFB^b. In addition, the bottom and charm asymmetries are measured using leptons
from semileptonic decays of heavy hadrons and pions from D*+ to D0pi+ decays.
The results are in agreement with the Standard Model predictions.


title: R-values in Low Energy e^+e^- Annihilation

abstract:
  This presentation briefly summarizes the recent measurements of R-values in
low energy e^+e^- annihilation. The new experiments aimed at reducing the
uncertainties in R-values and performed with the upgraded Beijing Spectrometer
(BESII) at Beijing Electron Positron Collider (BEPC) in Beijing and with CMD-2
and SND at VEEP-2M in Novosibirsk are reviewed and discussed.


title:
Consistent Measurements of alpha_s from Precise Oriented Event Shape
  Distributions

abstract:
  An updated analysis using about 1.5 million events recorded at $\sqrt{s} =
M_Z$ with the DELPHI detector in 1994 is presented. Eighteen infrared and
collinear safe event shape observables are measured as a function of the polar
angle of the thrust axis. The data are compared to theoretical calculations in
${\cal O} (\alpha_s^2)$ including the event orientation. A combined fit of
$\alpha_s$ and of the renormalization scale $x_{\mu}$ in $\cal O(\alpha_s^2$)
yields an excellent description of the high statistics data.
  The weighted average from 18 observables including quark mass effects and
correlations is $\alpha_s(M_Z^2) = 0.1174 \pm 0.0026$. The final result,
derived from the jet cone energy fraction, the observable with the smallest
theoretical and experimental uncertainty, is $\alpha_s(M_Z^2) = 0.1180 \pm
0.0006 (exp.) \pm 0.0013 (hadr.) \pm 0.0008 (scale) \pm 0.0007 (mass)$.
  Further studies include an $\alpha_s$ determination using theoretical
predictions in the next-to-leading log approximation (NLLA), matched NLLA and
$\cal O(\alpha_s^2$) predictions as well as theoretically motivated optimized
scale setting methods. The influence of higher order contributions was also
investigated by using the method of Pad\'{e} approximants. Average $\alpha_s$
values derived from the different approaches are in good agreement.


title:
Detecting the (Quasi-)Two-Body Decays of $\tau$ Leptons in
  Short-Baseline Neutrino Oscillation Experiments

abstract:
  Novel detector schemes are proposed for the short-baseline neutrino
experiments of next generation, aimed at exploring the large-$\Delta m^2$
domain of \omutau oscillations in the appearance mode. These schemes emphasize
good spectrometry for charged particles and for electromagnetic showers and
efficient reconstruction of \ypi_gg decays. The basic elements are a sequence
of relatively thin emulsion targets, immersed in magnetic field and
interspersed with electronic trackers, and a fine-grained electromagnetic
calorimeter built of lead glass. These elements act as an integral whole in
reconstructing the electromagnetic showers. This conceptual scheme shows good
performance in identifying the $\tau$ (quasi-)two-body decays by their
characteristic kinematics and in selecting the electronic decays of the $\tau$.


title:
Upper Limits in the Case That Zero Events are Observed: An Intuitive
  Solution to the Background Dependence Puzzle

abstract:
  We compare the ``unified approach'' for the estimation of upper limits with
an approach based on the Bayes theory, in the special case that no events are
observed. The ``unified approach'' predicts, in this case, an upper limit that
decreases with the increase in the expected level of background. This seems
absurd. On the other hand, the Bayesian approach leads to a result which is
background independent. An explanation of the Bayesian result is presented,
together with suggested reasons for the paradoxical result of the ``unified
approach''.


title: A Search for Lightly Ionizing Particles with the MACRO Detector

abstract:
  A search for lightly ionizing particles has been performed with the MACRO
detector. This search was sensitive to particles with charges between
$\fractional{5}$$e$ and close to the charge of an electron, with $\beta$
between approximately 0.25 and 1.0. Unlike previous searches both single track
events and tracks buried within high multiplicity muon showers were examined.
  In a period of approximately one year no candidates were observed. Assuming
an isotropic flux, for the single track sample this corresponds to a 90% C.L.
upper flux limit $\Phi \leq 9.2 \times 10^{-15} cm^{-2} sec^{-1} sr^{-1}$ .


title: A Status Report of KLOE at DAFNE

abstract:
  The major goal of the KLOE experiment is to measure Re(epsilon' /epsilon) in
the kkbar system, with a precision of 10^{-4},both via the traditional double
ratio method and quantum interferometry. The experiment has started taking data
at DAFNE, the phi-factory built at the Frascati National Laboratory (LNF) of
INFN in Italy, beginning in April 1999. In the early phase of the commissioning
(before KLOE roll-in), DAFNE has achieved multi bunch luminosities of 10^{31}
cm^{-2} s^{-1} with 13 bunches and 200 mA. Detailed studies are presently
underway to compensate for the large perturbation brought in by the KLOE
solenoid, which has caused a drastic decrease of the peak luminosity.
Nevertheless the first collected data, corresponding to an integral luminosity
of 220 nb^{-1}, show that KLOE is performing to the design specifications in
all its hardware and software components.


title: Spectroscopy and lifetime of bottom and charm hadrons

abstract:
  We review recent experimental results on spectroscopy and lifetime of bottom
and charm hadrons.


title: Magnetic monopoles

abstract:
  The main aim of this lecture is to give an update on the lectures on Magnetic
Monopoles (MMs) of the 1995 Trieste School. The update concerns theoretical
developments, searches for GUT monopoles in the penetrating cosmic radiation at
ever lower fluxes, study of the energy losses of MMs in the Earth and in
detectors,searches for low mass monopoles, and finally mention byproducts of MM
searches.


title: Charged Pion Energy Reconstruction in the ATLAS Barrel Calorimeter

abstract:
  The intrinsic performance of the ATLAS barrel and extended barrel
calorimeters for the measurement of charged pions is presented. Pion energy
scans (E = 20, 50, 200, 400 and 1000 GeV) at two pseudo-rapidity points ($\eta$
= 0.3 and 1.3) and pseudorapidity scans ($-0.2 < \eta < 1.8$) with pions of
constant transverse energy ($E_T = 20$ and 50 GeV) are analysed. A simple
approach, that accounts in first order for non-compensation and dead material
effects, is used for the pion energy reconstruction. The intrinsic performances
of the calorimeter are studied: resolution, linearity, effect of dead material,
tails in the energy distribution. The effect of electronic noise, cell energy
cuts and restricted cone size are investigated.


title:
Measurement of Hadron and Lepton-Pair Production at 130GeV < \sqrt{s} <
  189 GeV at LEP

abstract:
  We report on measurements of e+e- annihilation into hadrons and lepton pairs.
The data have been collected with the L3 detector at LEP at centre-of-mass
energies between 130 and 189 GeV. Using a total integrated luminosity of 243.7
pb^-1, 25864 hadronic and 8573 lepton-pair events are selected for the
measurement of cross sections and leptonic forward-backward asymmetries. The
results are in good agreement with Standard Model predictions.


title: Measurement of the Running of the Fine-Structure Constant

abstract:
  Bhabha scattering data recorded at \sqrt{s}=189 GeV by the L3 detector at LEP
are used to measure the running of the effective fine-structure constant for
spacelike momentum transfers. The results are alpha^-1(-2.1 GeV^2) -
alpha^-1(-6.25 GeV^2) = 0.78 +/- 0.26 alpha^-1(-12.25 GeV^2) - alpha^-1(-3434
GeV^2) = 3.80 +/- 1.29, in agreement with theoretical predictions.


title: Hard-Photon Production and Tests of QED at LEP

abstract:
  The total and differential cross sections of the process e+e- -> n gamma with
n >= 2 are measured using data collected by the L3 experiment at centre-of-mass
energies of \sqrt{s}=183 and 189 GeV. The results are in agreement with the
Standard Model expectations. Limits are set on deviations from QED, contact
interaction cut-off parameters and masses of excited electrons.


title:
Measurement of the e+e- -> Z gamma gamma Cross Section and Determination
  of Quartic Gauge Boson Couplings at LEP

abstract:
  A first measurement of the cross section of the process e+e- -> Z gamma gamma
is reported using a total integrated luminosity of 231 pb^-1 collected with the
L3 detector at centre-of-mass energies of 182.7 GeV and 188.7 GeV. By selecting
hadronic events with two isolated photons the e+e- -> Z gamma gamma cross
section is measured to be 0.49 +0.20 -0.17 +/- 0.04 pb at 182.7 GeV and 0.47
+/- 0.10 +/- 0.04 pb at 188.7 GeV. The measurements are consistent with
Standard Model expectations. Limits on Quartic Gauge Boson Couplings
a_0/Lambda^2 and a_c/Lambda^2 of -0.009 GeV^-2 < a_0/Lambda^2 < 0.008 GeV^-2
and -0.007 GeV^-2 < a_c/Lambda^2 < 0.013 GeV^-2 are derived at 95% confidence
level.


title: Search for Resonances Decaying to e^+ jet in e^+ p Interactions at HERA

abstract:
  The e^+ jet invariant mass spectrum produced in the reaction e^+ p -> e^+ X
has been studied at a center-of-mass energy of 300 GeV. The data were collected
using the ZEUS detector operating at the HERA collider, and correspond to an
integrated luminosity of 47.7 pb^{-1}. The observed mass spectrum is in good
agreement with Standard Model expectations up to an e^+ jet mass of 210 GeV.
Above this mass, some excess is seen. The angular distribution of these events
is typical of high-Q^2 neutral current events and does not give convincing
evidence for the presence of a narrow scalar or vector state. Limits are
presented on the product of cross section and branching ratio for such a state
and are interpreted as limits on leptoquark or R-parity-violating squark
production. Specific leptoquark types are ruled out at 95% confidence level for
coupling strength lambda=0.3 for masses between 150 and 280 GeV.


title: Physics of CP Violation and Rare Decays

abstract:
  Lectures note for Cargese 99 Summer School Particle Physics: Ideas and Recent
Development NATO Advanced Institute, Corsica, July 26-August 7, 1999


title: Study of b -> u l nu Decays with an Inclusive Generator

abstract:
  A generator for inclusive b -> u l nu decays has been developed. Different
prescriptions have been applied to describe the kinematics of the b-quark
inside the hadron and the generation of the hadronic final states. Results are
presented with particular attention to the invariant mass of the hadronic
system recoiling against the lepton and its resonance decomposition. These
studies are of special relevance for the extraction of Vub from semileptonic B
decays at LEP and at B factories.


title:
Use of Crystals for High Energy Photon Beam Linear Polarization
  Conversion into Circular

abstract:
  The possibility to convert the photon beam linear polarization into circular
one at photon energies of hundreds GeV with the use of crystals is considered.
The energy and orientation dependencies of refractive indexes are investigated
in case of diamond, silicon and germanium crystal targets. To maximize the
values for figure of merit, the corresponding crystal optimal orientation
angles and thickness are found. The degree of circular polarization and
intensity of photon beam are estimated and possibility of experimental
realization is discussed.


title: Enhancing the physical significance of Frequentist confidence intervals

abstract:
  It is shown that all the Frequentist methods are equivalent from a
statistical point of view, but the physical significance of the confidence
intervals depends on the method. The Bayesian Ordering method is presented and
confronted with the Unified Approach in the case of a Poisson process with
background. Some criticisms to both methods are answered. It is also argued
that a general Frequentist method is not needed.


title:
Search for Charginos with a Small Mass Difference with the Lightest
  Supersymmetric Particle at \sqrt{s} = 189 GeV

abstract:
  A search for charginos nearly mass-degenerate with the lightest
supersymmetric particle is performed using the 176 pb^-1 of data collected at
189 GeV in 1998 with the L3 detector. Mass differences between the chargino and
the lightest supersymmetric particle below 4 GeV are considered. The presence
of a high transverse momentum photon is required to single out the signal from
the photon-photon interaction background. No evidence for charginos is found
and upper limits on the cross section for chargino pair production are set. For
the first time, in the case of heavy scalar leptons, chargino mass limits are
obtained for any \tilde{\chi}^{+-}_1 - \tilde{\chi}^0_1 mass difference.


title: The H1 Silicon Vertex Detector

abstract:
  The design, construction and performance of the H1 silicon vertex detector is
described. It consists of two cylindrical layers of double sided, double metal
silicon sensors read out by a custom designed analog pipeline chip. The analog
signals are transmitted by optical fibers to a custom designed ADC board and
are reduced on PowerPC processors. Details of the design and construction are
given and performance figures from the first data taking periods are presented.


title: Selex

abstract:
  A summary of the path which lead to a high energy physics group at Instituto
de Fisica de la Universidad Autonoma de San Luis Potosi is presented. This
group is the result of the initial push made by Leon Lederman at the beginning
of the 80's.


title:
Measurements of Cross Sections and Forward-Backward Asymmetries at the Z
  Resonance and Determination of Electroweak Parameters

abstract:
  We report on measurements of hadronic and leptonic cross sections and
leptonic forward-backward asymmetries performed with the L3 detector in the
years 1993-95. A total luminosity of 103 pb^-1 was collected at centre-of-mass
energies \sqrt{s} ~ m_Z and \sqrt{s} ~ m_Z +/- 1.8 GeV which corresponds to 2.5
million hadronic and 245 thousand leptonic events selected. These data lead to
a significantly improved determination of Z parameters. From the total cross
sections, combined with our measurements in 1990-92, we obtain the final
results: m_Z = 91189.8 +/- 3.1 MeV, Gamma_Z = 2502.4 +/- 4.2 MeV, Gamma_had =
1741.1 +/- 3.8 MeV, Gamma_l = 84.14 +/- 0.17 MeV. An invisible width of
Gamma_inv = 499.1 +/- 2.9 MeV is derived which in the Standard Model yields for
the number of light neutrino species N_nu = 2.978 +/- 0.014. Adding our results
on the leptonic forward-backward asymmetries and the tau polarisation, the
effective vector and axial-vector coupling constants of the neutral weak
current to charged leptons are determined to be \bar{g}_V^l = -0.0397 +/-
0.0017 and \bar{g}_A^l = -0.50153 +/- 0.00053.Including our measurements of the
Z -> b \bar{b} forward-backward and quark charge asymmetries a value for the
effective electroweak mixing angle of sin^2\bar{\theta}_W = 0.23093 +/- 0.00066
is derived. All these measurements are in good agreement with the Standard
Model of electroweak interactions. Using all our measurements of electroweak
observables an upper limit on the mass of the Standard Model Higgs boson of m_H
< 133 GeV is set at 95% confidence level.


title:
Large-Area Scintillator Hodoscope with 50 ps Timing Resolution Onboard
  BESS

abstract:
  We describe the design and performance of a large-area scintillator hodoscope
onboard the BESS rigidity spectrometer; an instrument with an acceptance of 0.3
m^{2}sr.
  The hodoscope is configured such that 10 and 12 counters are respectively
situated in upper and lower layers.
  Each counter is viewed from its ends by 2.5 inch fine-mesh photomultiplier
tubes placed in a stray magnetic field of 0.2 Tesla.
  Various beam-test data are presented.
  Use of cosmic-ray muons at ground-level confirmed 50 ps timing resolution for
each layer, giving an overall time-of-flight resolution of 70 ps rms using a
pure Gaussian resolution function.
  Comparison with previous measurements on a similar scintillator hodoscope
indicates good agreement with the scaling law that timing resolution is
proportional to 1/$\sqrt{N_{\rm pe}}$, where $N_{\rm pe}$ is the effective
number of photoelectrons.


title: Search for antihelium in cosmic rays

abstract:
  The Alpha Magnetic Spectrometer (AMS) was flown on the space shuttle
Discovery during flight STS-91 in a 51.7 degree orbit at altitudes between 320
and 390 km. A total of 2.86 * 10^6 helium nuclei were observed in the rigidity
range 1 to 140 GV. No antihelium nuclei were detected at any rigidity. An upper
limit on the flux ratio of antihelium to helium of < 1.1 * 10^-6 is obtained.


title: Protons in near earth orbit

abstract:
  The proton spectrum in the kinetic energy range 0.1 to 200 GeV was measured
by the Alpha Magnetic Spectrometer (AMS) during space shuttle flight STS-91 at
an altitude of 380 km. Above the geomagnetic cutoff the observed spectrum is
parameterized by a power law. Below the geomagnetic cutoff a substantial second
spectrum was observed concentrated at equatorial latitudes with a flux ~ 70
m^-2 sec^-1 sr^-1. Most of these second spectrum protons follow a complicated
trajectory and originate from a restricted geographic region.


title:
A New Approach to Background Subtraction in Low-Energy Neutrino
  Experiments

abstract:
  We discuss a new method to extract neutrino signals in low energy
experiments. In this scheme the symmetric nature of most backgrounds allows for
direct cancellation from data. The application of this technique to the Palo
Verde reactor neutrino oscillation experiment allowed us to reduce the
measurement errors on the anti-neutrino flux from $\sim 20$% to $\sim 10$%. We
expect this method to substantially improve the data quality in future low
background experiments such as KamLAND and LENS.


title: Underground Muon Physics with the MACRO experiment

abstract:
  Underground muon events detected by the MACRO experiment at Gran Sasso have
been studied for different purposes. The studies include the vertical muon
intensity measurement, multiplicity distribution, lateral and angular muon
distribution and searches for substructures inside muon bundles. These analyses
have contributed to bring new insights in cosmic ray physics, in particular in
the framework of primary cosmic ray composition studies. Moreover, this
activity allows the testing and tuning of Monte Carlo simulations, in
particular for aspects associated with models of hadronic interactions and muon
propagation through the rock.


title: Cosmic Ray Muon Physics

abstract:
  We present a review of atmospheric and underground muon flux measurements.
The relevance of these data for the atmospheric neutrino flux computation is
emphasized. Possible sources of systematic errors in the measurements are
discussed, focusing on the sea level muon data. Underground muon data are also
reported.


title: New constraints on WIMPs from the Canfranc IGEX dark matter search

abstract:
  The IGEX Collaboration enriched 76Ge double-beta decay detectors are
currently operating in the Canfranc Underground Laboratory with an overburden
of 2450 m.w.e. A recent upgrade has made it possible to use them in a search
for WIMPs. A new exclusion plot has been derived for WIMP-nucleon
spin-independent interaction. To obtain this result, 30 days of data from one
IGEX detector, which has an energy threshold of ~4 keV, have been considered.
These data improve the exclusion limits derived from other germanium diode
experiments in the ~50 GeV DAMA region, and show that with a moderate
improvement of the background below 10 keV, the DAMA region may be tested with
an additional 1 kg-year of exposure.


title:
Spin alignment of $K^*(892)^\pm$ mesons produced in neutron-carbon
  interactions

abstract:
  A new precise measurements of spin density matrix element $\rho_{00}$ of
$K^*(892)^{\pm}$ mesons produced inclusively in neutron-carbon interactions at
\~60 GeV have been carried out in the EXCHARM experiment at the Serpukhov
accelerator. The values of $\rho_{00}$ obtained in the transversity frame are
$0.424\pm0.011(stat)\pm0.018(sys)$ for $K^*(892)^+$ and
$0.393\pm0.025(stat)\pm0.018(sys)$ for $K^*(892)^-$. Significant $P_T$
dependence of $\rho_{00}$ has been observed in $K^*(892)^+$ production.


title: Confidence limits: what is the problem? Is there the solution?

abstract:
  This contribution to the debate on confidence limits focuses mostly on the
case of measurements with `open likelihood', in the sense that it is defined in
the text. I will show that, though a prior-free assessment of {\it confidence}
is, in general, not possible, still a search result can be reported in a mostly
unbiased and efficient way, which satisfies some desiderata which I believe are
shared by the people interested in the subject. The simpler case of `closed
likelihood' will also be treated, and I will discuss why a uniform prior on a
sensible quantity is a very reasonable choice for most applications. In both
cases, I think that much clarity will be achieved if we remove from scientific
parlance the misleading expressions `confidence intervals' and `confidence
levels'.


title:
Uncertainties due to imperfect knowledge of systematic effects: general
  considerations and approximate formulae

abstract:
  Starting from considerations about meaning and subsequent use of asymmetric
uncertainty intervals of experimental results, we review the issue of
uncertainty propagation. We show that, using a probabilistic approach (the
so-called Bayesian approach), all sources of uncertainty can be included in a
logically consistent way. Practical formulae for the first moments of the
probability distribution are derived up to second-order approximations.


title: Search for spatial anisotropy in beta-decays

abstract:
  Theoretically a possibility of covariance violation in weak decays is not
ruled out from the first principles, while there are some models predicting
non-covariance revealed in weak interactions. The experimental evidence for
isotropy violation in $\beta$-decays was recently reported. We present a study
of the dependence of electron flow rate and $\beta$-electron energy in the
decay of $Sr^{90}$ with respect to the direction of electron emission. An upper
limit of $1.4 \cdot 10^{-5}$ on directional dependence of $\beta$-electron
energy was obtained.


title:
Spin Correlation in tt-bar Production from pp-bar Collisions at
  sqrt(s)=1.8 TeV

abstract:
  The D0 collaboration has performed a study of spin correlation in tt-bar
production for the process tt-bar to bb-bar W^+W^-, where the W bosons decay to
e-nu or mu-nu. A sample of six events was collected during an exposure of the
D0 detector to an integrated luminosity of approximately 125 pb^-1 of
sqrt{s}=1.8 TeV pp-bar collisions. The standard model (SM) predicts that the
short lifetime of the top quark ensures the transmission of any spin
information at production to the tt-bar decay products.
  The degree of spin correlation is characterized by a correlation coefficient
k. We find that k>-0.25 at the 68% confidence level, in agreement with the SM
prediction of k=0.88.


title: A Review of Bs Mixing: Past, Present and Future

abstract:
  We review the experimental status of Bs mixing. After a brief historical
overview, current studies of the time dependence of Bs oscillations are
described, with an emphasis on the different experimental techniques used by
the ALEPH, CDF, DELPHI, OPAL, and SLD Collaborations. To conclude, the outlook
for future experiments is presented.


title: Study of RPC gas mixtures for the ARGO-YBJ experiment

abstract:
  The ARGO-YBJ experiment consists of a RPC carpet to be operated at the
Yangbajing laboratory (Tibet, P.R. China), 4300 m a.s.l., and devoted to the
detection of showers initiated by photon primaries in the energy range 100 GeV
- 20 TeV. The measurement technique, namely the timing on the shower front with
a few tens of particles, requires RPC operation with 1 ns time resolution, low
strip multiplicity, high efficiency and low single counting rate. We have
tested RPCs with many gas mixtures, at sea level, in order to optimize these
parameters. The results of this study are reported.


title: Spin Physics with the STAR detector

abstract:
  The STAR detector will bring unique capabilities to the study of
$\vec{p}+\vec{p}$ collisions up to total center of mass energies of 500 GeV at
RHIC. The large acceptance of the time projection chamber and the
electromagnetic calorimeter enable STAR to observe jets, and to detect photons
and electrons in important regions of phase space. The premier experiments of
the STAR spin program are discussed in this contribution. Photon + jet
coincidence measurements will provide the world's best determination of the
contribution gluons make to the proton's spin. Detection of the daughter
electrons and positrons from $W^\pm$ decay will enable the determination of the
polarization of the $q\bar{q}$ sea within the proton.


title:
Transverse and Longitudinal Bose Einstein Correlations in hadronic Z0
  Decays

abstract:
  Bose-Einstein correlations in pairs of identical charged pions produced in a
sample of 4.3 million Z0 hadronic decays are studied as a function of the three
components of the momentum difference, transverse ("out" and "side") and
longitudinal with respect to the thrust direction of the event. A significant
difference between the transverse, r_t_side, and longitudinal, r_l, dimensions
is observed, indicating that the emitting source of identical pions, as
observed in the Longitudinally CoMoving System, has an elongated shape. This is
observed with a variety of selection techniques. Specifically, the values of
the parameters obtained by fitting the extended Goldhaber parametrisation to
the correlation function C'= C^{DATA}}/C^{MC} for two-jet events, selected with
the Durham algorithm and resolution parameter ycut=0.04, are
r_t_out=(0.647+-0.011(stat})+0.022-0.124(syst)) fm,
r_t_side=(0.809+-0.009(stat)+0.019-0.032}(syst)) fm,
r_l=(0.989+-0.011(stat)+0.030-0.015(syst})) fm and
r_l/r_t_side=1.222+-0.027(stat})+0.075-0.012(syst). The results are discussed
in the context of a recent model of Bose-Einstein correlations based on string
fragmentation.


title:
Germanium Detector with Internal Amplification for Investigation of Rare
  Processes

abstract:
  Device of new type is suggested - germanium detector with internal
amplification. Such detector having effective threshold about 10 eV opens up
fresh opportunity for investigation of dark matter, measurement of neutrino
magnetic moment, of neutrino coherent scattering at nuclei and for study of
solar neutrino problem. Construction of germanium detector with internal
amplification and perspectives of its use are described.


title: Dynamics of the decay eta->3pi0

abstract:
  The parameter $ \alpha = -0.005 \pm 0.007 (stat) \pm 0.004 (syst)$ describing
the density of events within the $ \eta \to 3\pi^0 $ Dalitz plot has been
measured using data from Brookhaven experiment E852. The result is compared to
previous values and theoretical predictions.


title: Study of the Decays B0 --> D(*)+D(*)-

abstract:
  The decays B0 --> D*+D*-, B0 --> D*+D- and B0 --> D+D- are studied in 9.7
million Y(4S) --> BBbar decays accumulated with the CLEO detector. We determine
Br(B0 --> D*+D*-) = (9.9+4.2-3.3+-1.2)e-4 and limit Br(B0 --> D*+D-) < 6.3e-4
and Br(B0 --> D+D-) < 9.4e-4 at 90% confidence level (CL). We also perform the
first angular analysis of the B0 --> D*+D*- decay and determine that the
CP-even fraction of the final state is greater than 0.11 at 90% CL. Future
measurements of the time dependence of these decays may be useful for the
investigation of CP violation in neutral B meson decays.


title: Inclusive Sigma+ and Sigma0 Production in Hadronic Z Decays

abstract:
  We report on measurements of the inclusive production rate of Sigma+ and
Sigma0 baryons in hadronic Z decays collected with the L3 detector at LEP. The
Sigma+ baryons are detected through the decay Sigma+ -> p pi0, while the Sigma0
baryons are detected via the decay mode Sigma0 -> Lambda gamma. The average
numbers of Sigma+ and Sigma0 per hadronic Z decay are measured to be: <
N_Sigma+ > + < N_Sigma+~ > = 0.114 +/- 0.011 (stat) +/- 0.009 (syst), <
N_Sigma0 > + < N_Sigma0~ > = 0.095 +/- 0.015 (stat) +/- 0.013 (syst). These
rates are found to be higher than the predictions from Monte Carlo
hadronization models and analytical parameterizations of strange baryon
production.


title: What is the Usefulness of Frequentist Confidence Intervals?

abstract:
  The following questions are discussed: ``Why confidence intervals are a hot
topic?''; ``Are confidence intervals objective?''; ``What is the usefulness of
coverage?''; ``How to obtain useful information from experiment?''; ``The
confidence level must be chosen independently from the knowledge of the
data?''.


title:
Search for Compositeness, Leptoquarks and Large Extra Dimensions in eq
  Contact Interactions at HERA

abstract:
  The reaction e+p --> e+X is studied with the H1 detector at Hera. The data
cover momentum transfers Q^2 between 200 GeV^2 and 30,000 GeV^2 and correspond
to an integrated luminosity of 35.6 pb^(-1). The differential cross section
dsigma/dQ^2 is compared to the Standard Model expectation for neutral current
scattering and analysed to search for bar(e)e bar(q)q contact interactions. No
evidence for new phenomena is observed. The results are used to set limits on
scales within models of electron--quark compositeness, quark form factors and
the exchange of virtual heavy leptoquarks. A search for gravitational effects
mediated through the exchange of virtual gravitons which propagate into large
extra dimensions is presented.


title: Energy Losses of Q-balls

abstract:
  After a short review of Q-balls properties, in this paper we discuss their
interaction with matter, and their energy losses in the earth, for a large
range of velocities. These calculations are used to compute the fractional
angular acceptance of a detector located at Gran Sasso Laboratory. Furthermore
we computed the light yield in liquid scintillators, the ionization in streamer
tubes and the Restricted Energy Loss in the CR39 nuclear track detector.


title:
Search for CP violation in B+- -> J/psi K+- and B+- -> psi(2S) K+-
  decays

abstract:
  We present a search for direct CP violation in B+- -> J/psi K+- and B+- ->
psi(2S) K+- decays. In a sample of 9.7 million B meson pairs collected with the
CLEO detector, we have fully reconstructed 534 B+- -> J/psi K+- and 120 B+- ->
psi(2S) K+- decays with very low background. We have measured the CP-violating
charge asymmetry to be (+1.8+-4.3[stat]+-0.4[syst])% for B+- -> J/psi K+- and
(+2.0+-9.1[stat]+-1.0[syst])% for B+- -> psi(2S) K+-.


title:
Search for New Particles Decaying to top-antitop in proton-antiproton
  collisions at squareroot(s)=1.8 TeV

abstract:
  We use 106 $\ipb$ of data collected with the Collider Detector at Fermilab to
search for narrow-width, vector particles decaying to a top and an anti-top
quark. Model independent upper limits on the cross section for narrow, vector
resonances decaying to $\ttbar$ are presented. At the 95% confidence level, we
exclude the existence of a leptophobic $\zpr$ boson in a model of
topcolor-assisted technicolor with mass $M_{\zpr}$ $<$ 480 $\gev$ for natural
width $\Gamma$ = 0.012 $M_{\zpr}$, and $M_{\zpr}$ $<$ 780 $\gev$ for $\Gamma$ =
0.04 $M_{\zpr}$.


title: About EAS size spectra and primary energy spectra in the knee region

abstract:
  Based on the unified analyses of KASCADE, AKENO, EAS-TOP and ANI EAS size
spectra, the approximations of energy spectra of different primary nuclei have
been found. Calculations were carried out using SIBYLL and QGSJET interaction
models in 0.1-100 PeV primary energy range. The results point to existence of
both rigidity-dependent steepening energy spectra at R=200-400 TV and an
additional proton (neutron) component with differential energy spectrum
(6.1+/-0.7)10^{-11}(E/Ek)^{-1.5} (m^2.s.sr.TeV)^{-1} before the knee
Ek=2030+/-130 TeV and with power index g2=-3.1+/-0.05 after the knee.


title:
Ratio of Electron Scattering from Nuclei to Deuterium at low x and low
  Momentum Transfer

abstract:
  We have extracted ratios of cross sections for scattering electrons from high
mass targets compared to low mass targets in the region of x ~ 0.02 and Q^2 < 1
(GeV/c)^2 from SLAC experiments performed over the past three decades.
Additional analysis was needed for radiative corrections, target end caps and
calibration runs. We observe no significant difference in the nuclear ratio for
low Q^2 compared to results at Q^2 > 1.


title: Hybrid Meson Structure at COMPASS

abstract:
  We describe a pion physics program attainable with the CERN COMPASS
spectrometer, involving tracking detectors and an electromagnetic calorimeter.
COMPASS can realize state-of-the-art pion beam hybrid meson and meson radiative
transition studies. We review here the physics motivation for this program. We
describe the beam, detector, trigger requirements, and hardware/software
requirements for this program. The triggers for all this hybrid meson physics
can be implemented for simultaneous data taking.
  We will investigate hybrid meson production via pion-photon Primakoff and
pion-Pomeron diffractive interactions. We will determine new properties of
quark-antiquark-gluon hybrid mesons, using unique production methods, to
improve our understanding of these exotic mesons.
  The CERN COMPASS experiment uses 100-280 GeV beams (muon, pion), and magnetic
spectrometers and calorimeters, to measure the complete kinematics of
pion-photon and pion-Pomeron reactions. The COMPASS experiment is currently
under construction, and scheduled to begin data runs in 2001. We carry out
simulation studies to optimize the beam, detector, trigger, and
hardware/software for achieving high statistics data with low systematic
uncertainties in the hybrid meson component of this program. We will improve
previous Primakoff Hybrid studies by three orders of magnitude. We implement
special detectors and triggers for hybrid meson production reactions. We
propose to prepare for these COMPASS pion beam hybrid studies by setting up
with muon beam tests.


title:
Central Pb+Pb Collisions at 158 A GeV/c Studied by Pion-Pion
  Interferometry

abstract:
  Two-particle correlations have been measured for identified negative pions
from central 158 AGeV Pb+Pb collisions and fitted radii of about 7 fm in all
dimensions have been obtained. A multi-dimensional study of the radii as a
function of kT is presented, including a full correction for the resolution
effects of the apparatus. The cross term Rout-long of the standard fit in the
Longitudinally CoMoving System (LCMS) and the vl parameter of the generalised
Yano-Koonin fit are compatible with 0, suggesting that the source undergoes a
boost invariant expansion. The shapes of the correlation functions in Qinv and
Qspace have been analyzed in detail. They are not Gaussian but better
represented by exponentials. As a consequence, fitting Gaussians to these
correlation functions may produce different radii depending on the acceptance
of the experimental setup used for the measurement.


title:
Analysis of the experimental results from the EAS installation GAMMA at
  Mt. Aragats

abstract:
  The phenomenological characterstics of the electron and muon components of
EAS with the size 10^5-10^7 are obtained by the GAMMA installation of the ANI
experiment at the Mt. Aragats in Armenia at the observation level 700 g/cm^2.
The experimental results are compared with other experiments and with the
simulation carried out using the CORSIKA code.


title:
Measurement of Di-jet Cross-Sections in Photoproduction and Photon
  Structure

abstract:
  The production of hard di-jet events in photoproduction at HERA is dominated
by resolved photon processes in which a parton in the photon with momentum
fraction x_gamma is scattered from a parton in the proton. These processes are
sensitive to the quark and gluon content of the photon. The differential di-jet
cross-section dsigma/dlog(x_gamma) is presented here, measured in tagged
photoproduction at HERA using data taken with the H1 detector, corresponding to
an integrated luminosity of 7.2 pb^(-1). Using a restricted data sample at high
transverse jet energy, E_(T,jet)>6 GeV, the effective parton density
f_gamma,eff(x_gamma) = [q(x_gamma) + bar(q)(x_gamma) +9/4g(x_gamma)] in the
photon in leading order QCD is measured down to x_gamma=0.05 from which the
gluon density in the photon is derived.


title: High pt charged-pion production in Pb-Au collisions at 158AGeV/c

abstract:
  The CERES/Na45 experiment at CERN SPS measured transverse momentum spectra of
charged-pions in the range 1<pt<4GeV/c near mid-rapidity in 158 AGeV/c Pb-Au
collisions. The invariant transverse momentum spectra are exponential over the
entire observed range. The average inverse slope is 245+/- 5MeV/c, it shows a
2.4% increase with centrality of the collision over the 35% most central
fraction of the cross section. The pi-/pi+ ratio is constant at 1.028+/-0.005
over the pt interval measured.


title: Measurement of |Vcb| using B0 to D*l nu decays

abstract:
  The magnitude of the Cabibbo-Kobayashi-Maskawa matrix element Vcb has been
measured using B0 to D*l nu decays recorded on the Z0 peak using the OPAL
detector at LEP. The D* to D0 pi+ decays were reconstructed both in the
particular decay modes D0 to K- pi+ and D0 to K- pi+ pi- and via an inclusive
technique. The product of |Vcb| and the decay form factor of the B0 to D* l nu
transition at zero recoil F(1) was measured to be F(1)|Vcb| =
(37.1+-1.0+-2.0)x10^-3, where the uncertainties are statistical and systematic
respectively. By using Heavy Quark Effective Theory calculations for F(1), a
value of |Vcb| = (40.7+-1.1+-2.2+-1.6)x 10^-3 was obtained, where the third
error is due to theoretical uncertainties in the value of F(1). The branching
ratio Br(B0 to D* l nu) was also measured to be (5.26+-0.20+-0.46)%.


title: High Energy Particles from the Universe

abstract:
  The field of high energy particle astronomy is exciting and rapidly
developing. In the last few years, we have detected extragalactic sources of
intense TeV gamma radiation and individual cosmic ray particles with energies
exceeding 25 Joules. Understanding the workings of astrophysics under extreme
conditions is the primary goal of this field. Also important is the possibility
of using high energy particles from space to probe beyond the standard models
of particle physics and cosmology. This paper presents a review of high energy
particle astronomy using photons, cosmic rays, and neutrinos.


title:
Present Situation of Diffracted X-ray Radiation and Resonance (Coherent)
  Transition Radiation Induced by High Energy Charged Particles in Frequencies
  Region Exiding Atomic one

abstract:
  The review is devoted to the modern investigations of electromagnetic
radiation by relativistic charged particles propagating with constant velocity
through the periodic media. Two examples of radiation are considered in this
review, the first corresponds to the Bragg scattering of charged particles
pseudophotons in crystals, the second one to the Fresnel scattering of
pseudophotons in periodic medium. Both examples play essential role in
construction new compact tunable sources in X-ray region.


title: Z boson pair production in e+e- collisions at sqrt(s) = 183 and 189 GeV

abstract:
  A study of Z boson pair production in e+e- annihilation at center-of-mass
energies near 183 GeV and 189 GeV is reported. Final states containing only
leptons, (l+l-l+l- and l+l-nu nubar), quark and lepton pairs, (q qbar l+l-, q
qbar nu nubar) and the all-hadronic final state (q qbar q qbar) are considered.
In all states with at least one Z boson decaying hadronically, q qbar and b
bbar final states are considered separately using lifetime and event-shape
tags, thereby improving the cross-section measurement. At sqrt(s) = 189 GeV the
Z-pair cross section was measured to be 0.80 (+0.14-0.13, stat.) (+0.06-0.05,
syst.) pb, consistent with the Standard Model prediction. At sqrt(s) = 183 GeV
the 95% C.L. upper limit is 0.55 pb. Limits on anomalous ZZgamma and ZZZ
couplings are derived.


title: Measurement of Azimuthal Asymmetries in Deep Inelastic Scattering

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


title: Measurement of Inclusive Ds+- Photoproduction at HERA

abstract:
  The first measurement of inclusive Ds+- photoproduction at HERA has been
performed with the ZEUS detector for photon-proton centre-of-mass energies 130
< W < 280 GeV. The measured cross section for 3 < pt(Ds) < 12 GeV and
|eta(Ds)|< 1.5 is sigma(ep -> Ds X) = 3.79 +- 0.59 (stat.) +0.26-0.46 (syst.)
+- 0.94 (br.) nb, where the last error arises from the uncertainty in the Ds
decay branching ratio. The measurements are compared with inclusive D*+-
photoproduction cross sections in the same kinematic region and with QCD
calculations. The Ds cross sections lie above a fixed-order next-to-leading
order calculation and agree better with a tree-level O(alpha,alpha_s^3)
calculation that was tuned to describe the ZEUS D* cross sections. The ratio of
Ds+- to D*+- cross sections is 0.41 +- 0.07 (stat.) +0.03-0.05 (syst.) +- 0.10
(br.). From this ratio, the strangeness-suppression factor in charm
photoproduction, within the LUND string fragmentation model, has been
calculated to be gamma_s = 0.27 +- 0.05 +- 0.07 (br.). The cross-section ratio
and gamma_s are in good agreement with those obtained in charm production in
e+e- annihilation.


title: Measurement of Structure Dependent K^+ -> mu^+ nu gamma

abstract:
  We report the first measurement of a structure dependent component in the
decay K^+ -> mu^+ nu gamma. Using the kinematic region where the muon kinetic
energy is greater than 137 MeV and the photon energy is greater than 90 MeV, we
find that the absolute value of the sum of the vector and axial-vector form
factors is |F_V+F_A| =0.165 \pm 0.007 \pm 0.011. This corresponds to a
branching ratio of BR(SD^+) = (1.33 \pm 0.12 \pm 0.18) \times 10^{-5}. We also
set the limit -0.04 < F_V-F_A < 0.24 at 90% c.l.


title: Elastic Photoproduction of J/psi and Upsilon Mesons at HERA

abstract:
  Cross sections for elastic photoproduction of J/Psi and Upsilon mesons are
presented. For J/Psi mesons the dependence on the photon-proton centre-of-mass
energy W_gammap is analysed in an extended range with respect to previous
measurements of 26<=W_gammap<= 285 GeV. The measured energy dependence is
parameterized as sigma_gammap proportional W_gammap^delta with
delta=0.83+-0.07. The differential cross section dsigma/dt for J/Psi mesons is
derived, its dependence on W_gammap and on t is analysed and the effective
trajectory (in terms of Regge theory) is determined to be
alpha(t)=(1.27+-0.05)+(0.08+-0.17)*t/GeV^2. Models based on perturbative QCD
and on pomeron exchange are compared to the data.


title: Color reconnection and Bose-Einstein correlations at LEP2

abstract:
  Recent investigations of final state interactions of W+W- events in e+e-
collisions up to center of mass energies sqrt{S}=189GeV at LEP2 are reviewed.
The data were used to look for color reconnection and Bose-Einstein
correlations between the two color singlets of fully hadronic W events.


title: Results from the Palo Verde Neutrino Oscillation Experiment

abstract:
  The $\nuebar$ flux and spectrum have been measured at a distance of about 800
m from the reactors of the Palo Verde Nuclear Generating Station using a
segmented Gd-loaded liquid scintillator detector. Correlated positron-neutron
events from the reaction $\nuebar$p$\to$e^+n were recorded for a period of 200
d including 55 d with one of the three reactors off for refueling. Backgrounds
were accounted for by making use of the reactor-on and reactor-off cycles, and
also with a novel technique based on the difference between signal and
background under reversal of the e^+ and n portions of the events. A detailed
description of the detector calibration, background subtraction, and data
analysis is presented here. Results from the experiment show no evidence for
neutrino oscillations. $\nuebar\to\bar\nu_x$ oscillations were excluded at 90%
CL for $\dm>1.12\times10^{-3}$ eV^2 for full mixing, and $\sinq>0.21$ for large
$\dm$. These results support the conclusion that the observed atmospheric
neutrino oscillations does not involve $\nu_{\rm e}$.


title: Measurement of the Lifetime of the Tau Lepton

abstract:
  The tau lepton lifetime is measured with the L3 detector at LEP using the
complete data taken at centre-of-mass energies around the Z pole resulting in
tau_tau = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result
with the muon lifetime supports lepton universality of the weak charged current
at the level of six per mille. Assuming lepton universality, the value of the
strong coupling constant, alpha_s is found to be alpha_s(m_tau^2) = 0.319 +/-
0.015(exp.) +/- 0.014 (theory).


title: Photon colliders: key problems, new ideas

abstract:
  High energy photon colliders based on laser backscattering are a very natural
extension of a e+e- linear colliders and open new possibilities to study of the
matter. This option has been included in the pre-conceptual designs of linear
colliders and work on Technical Design Reports is in progress. The physics
motivation for photon colliders is quite clear though more studies are needed.
The proof of its technical feasibility and the search for the best solutions is
of first priority now. In this talk we discuss: physics motivation, laser
problems and new possible solutions, and generation of low emittance beams
needed for obtaining very high luminosities.

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


title: Heavy Quark Decays

abstract:
  The status of heavy-quark decays as of summer 1999 is reviewed. New
measurements of semileptonic B decays from LEP and from CLEO are reported and
the status of determining the CKM parameters |Vcb| and |Vub| is assessed. Rare
charmless hadronic B decays are reviewed, including the first observation of
B->pi pi from CLEO. First attempts to measure CP asymmetries in rare decays are
described. The implications of all of the data for our understanding of the
Standard Model are briefly assessed.


title:
Limits on Gravitino Production and New Processes with Large Missing
  Transverse Energy in p-pbar Collisions at sqrt(s)=1.8 TeV

abstract:
  Events collected by the Collider Detector at Fermilab (CDF) with an energetic
jet plus large missing transverse energy can be used to search for physics
beyond the Standard Model. We see no deviations from the expected background
and set upper limits on the production of new processes. We consider in
addition the production of light gravitinos within the framework of the Gauge
Mediated Supersymmetry Breaking models and set a limit at 95% confidence level
on the breaking scale sqrt(F) >= 217 GeV, which excludes gravitino masses
smaller than 1.1x10^-5 eV/c^2.


title: Bottom Quark Physics - Past, Present, Future

abstract:
  On the occasion of a symposium honoring my collegue Adrian Melissinos, I gave
an informal, personal review of bottom quark physics. This paper is a writeup
of that talk. I first summarize the early days, the decade from the discovery
through the determination of the b quark's rough features. I note a change in
objective which occurred around 1990, with the new emphasis being USING the b
quark, to probe the Standard Model and to search for physics `beyond the
Standard Model'. I review the flavor sector of the Standard Model, showing why
the b quark is such a useful probe. I then discuss three topics of current
interest: the determination of V_ub; studies of rare hadronic B decays; and the
radiative penguin decay b -> s gamma.


title: Search for "light" magnetic monopoles

abstract:
  We propose to implement one passive nuclear track detector array of 400 m^2
at the Chacaltaya High Altitude Laboratory (5230 m a.s.l.). The main purposes
of the experiment concern the searches for magnetic monopoles of relatively low
masses at the Parker bound level, searches for low mass nuclearites and
searches for some supersymmetric dark matter candidates (Q-balls).


title:
Multiplicity dependence of correlation functions in \bar{p}p reactions
  at sqrt(s) = 630 GeV

abstract:
  Discussions about Bose-Einstein correlations between decay products of
coproduced W-bosons again raise the question about the behaviour of
correlations if several strings are produced. This is studied by the
multiplicity dependence of correlation functions of particle pairs with
like-sign and opposite-sign charge in \bar{p}p reactions at sqrt{s} = 630 GeV.


title:
Prompt Photon Production and Observation of Deeply Virtual Compton
  Scattering

abstract:
  Two recent results in ep physics using the ZEUS detector at HERA are
discussed: a measurement of the prompt photon production cross section in
photoproduction, and the first observation of Deeply Virtual Compton Scattering
in DIS.


title: The $\phi\to\eta\pi^0\gamma$ decay

abstract:
  Rare radiative decay $\phi\to\eta\pi^0\gamma$ was studied with SND detector
at {VEPP-2M} electron-positron collider and its branching ratio was measured:
$B(\phi\to\eta\pi^0\gamma)=(0.88\pm0.14\pm0.09)\cdot 10^{-4}$. Significant
contribution of the $a_0(980)\gamma$ intermediate state was observed in the
decay. The result is based on total integrated luminosity corresponding to
$2\cdot10^7$ produced $\phi$ mesons.


title: Capacitance of Silicon Pixels

abstract:
  Capacitance measurements have been made on silicon pixel sensors of types n+
on n, p+ on n, and n+ on p. The arrays test a variety of implant and gap
widths, and the n+ on n devices test several p-stop designs. The measurements
examine inter-pixel and backplane contributions and include studies of
temperature dependence. Measurements were made before and after irradiation
with fluences relevant to LHC experiments and Fermilab Tevatron Run 2.


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

abstract:
  The reaction pp -> pf (eta eta) ps has been studied at 450 GeV/c. For the
first time a partial wave analysis of the centrally produced eta eta system has
been performed. Signals for the f0(1500), f0(1710) and f2(2150) are observed
and the decay branching fractions of these states are determined.


title: Nucleon Electromagnetic Form Factors

abstract:
  A review of data on the nucleon electromagnetic form factors in the
space-like region is presented. Recent results from experiments using polarized
beams and polarized targets or nucleon recoil polarimeters have yielded a
significant improvement on the precision of the data obtained with the
traditional Rosenbluth separation. Future plans for extended measurements are
outlined.


title: Measurement of B(/\c->pKpi)

abstract:
  The /\c->pKpi yield has been measured in a sample of two-jet continuum events
containing a both an anticharm tag (Dbar) as well as an antiproton (e+e- ->
Dbar pbar X), with the antiproton in the hemisphere opposite the Dbar. Under
the hypothesis that such selection criteria tag e+e- -> Dbar pbar (/\c) X
events, the /\c->pkpi branching fraction can be determined by measuring the
pkpi yield in the same hemisphere as the antiprotons in our Dbar pbar X sample.
Combining our results from three independent types of anticharm tags, we obtain
B(/\c->pKpi)=(5.0+/-0.5+/-1.2)%


title: Resonance structure of tau->Kpipi decays

abstract:
  Using a sample of 4.7/fb integrated luminosity accumulated with the CLEO II
detector at the Cornell Electron Storage Ring (CESR), we investigate the mass
spectrum and resonant structure in tau->Kpipi decays. We measure the relative
fractions of K1(1270) and K1(1400) resonances in these decays, as well as the
K1 masses and widths. Our fitted K1 resonances are somewhat broader than
previous hadroproduction measurements, and in agreement with recent LEP results
from tau decay. The larger central value of our measured width supports models
which attribute the small tau->Kpipi branching fraction to larger K1 widths
than are presently tabulated. We also determine the Ka-Kb mixing angle theta_K.


title:
Search for Second and Third Generation Leptoquarks Including Production
  via Technicolor Interactions in $p \bar{p}$ collisions at $\sqrt{s}=1.8$ TeV

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: Polarimetry at a Future Linear Collider - How Precise?

abstract:
  At a future linear collider, a polarized electron beam will play an important
role in interpreting new physics signals. Backgrounds to a new physics reaction
can be reduced by choice of the electron polarization state. The origin of a
new physics reaction can be clarified by measuring its polarization-dependence.
This paper examines some options for polarimetry with an emphasis on physics
issues that motivate how precise the polarization determination needs to be. In
addition to Compton polarimetry, the possibility of using Standard Model
asymmetries, such as the asymmetry in forward W-pairs, is considered as a
possible polarimeter. Both e+e- and e-e- collider modes are considered.


title: Measurement of the Photon Structure Function at High Q^2 at LEP

abstract:
  The structure functions of real and virtual photons are derived from cross
section measurements of the reaction e^+e^ -> e^+e^- + hadrons at LEP. The
reaction is studied at \sqrt{s} ~ 91 GeV with the L3 detector. One of the final
state electrons is detected at a large angle relative to the beam direction,
leading to Q^2 values between 40 GeV^2 and 500 GeV^2. The other final state
electron is either undetected or it is detected at a four-momentum transfer
squared P^2 between 1 GeV^2 and 8 GeV^2. These measurements are compared with
predictions of the Quark Parton Model and other QCD based models.


title:
Search for an invisibly decaying Higgs boson in e^+e^- collisions at
  \sqrt{s} = 183 - 189 GeV

abstract:
  A search for a Higgs boson decaying into invisible particles is performed
using the data collected at LEP by the L3 experiment at centre-of-mass energies
of 183 GeV and 189 GeV. The integrated luminosities are respectively 55.3 pb^-1
and 176.4 pb^-1. The observed candidates are consistent with the expectations
from Standard Model processes. In the hypothesis that the production cross
section of this Higgs boson equals the Standard Model one and the branching
ratio into invisible particles is 100%, a lower mass limit of 89.2 GeV is set
at 95% confidence level.


title:
Radio-Frequency Measurements of Coherent Transition and Cherenkov
  Radiation: Implications for High-Energy Neutrino Detection

abstract:
  We report on measurements of 11-18 cm wavelength radio emission from
interactions of 15.2 MeV pulsed electron bunches at the Argonne Wakefield
Accelerator. The electrons were observed both in a configuration where they
produced primarily transition radiation from an aluminum foil, and in a
configuration designed for the electrons to produce Cherenkov radiation in a
silica sand target. Our aim was to emulate the large electron excess expected
to develop during an electromagnetic cascade initiated by an ultra high-energy
particle. Such charge asymmetries are predicted to produce strong coherent
radio pulses, which are the basis for several experiments to detect high-energy
neutrinos from the showers they induce in Antarctic ice and in the lunar
regolith. We detected coherent emission which we attribute both to transition
and possibly Cherenkov radiation at different levels depending on the
experimental conditions. We discuss implications for experiments relying on
radio emission for detection of electromagnetic cascades produced by ultra
high-energy neutrinos.


title:
Track Fit Hypothesis Testing and Kink Selection using Sequential
  Correlations

abstract:
  Deviations between the form of trajectory assumed in a fit to a set of
measurements and the actual form of the trajectory can give rise to sequential
correlations in the residuals from the fit. These correlations can provide a
more powerful goodness-of-fit test than that based on the minimum chi-square
from a least squares fit. The use of this additional information is explored in
the context of several common trajectory errors (e.g. decays in flight)
encountered in charged particle tracking.


title:
Hadron Energy Reconstruction for the ATLAS Barrel Prototype Combined
  Calorimeter in the Framework of the Non-parametrical Method

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


title: Energy Spectra, Altitude Profiles and Charge Ratios of Atmospheric Muons

abstract:
  We present a new measurement of air shower muons made during atmospheric
ascent of the High Energy Antimatter Telescope balloon experiment. The muon
charge ratio mu+ / mu- is presented as a function of atmospheric depth in the
momentum interval 0.3-0.9 GeV/c. The differential mu- momentum spectra are
presented between 0.3 and about 50 GeV/c at atmospheric depths between 13 and
960 g/cm^2. We compare our measurements with other recent data and with Monte
Carlo calculations of the same type as those used in predicting atmospheric
neutrino fluxes. We find that our measured mu- fluxes are smaller than the
predictions by as much as 70% at shallow atmospheric depths, by about 20% at
the depth of shower maximum, and are in good agreement with the predictions at
greater depths. We explore the consequences of this on the question of
atmospheric neutrino production.


title: Confronting classical and Bayesian confidence limits to examples

abstract:
  Classical confidence limits are compared to Bayesian error bounds by studying
relevant examples. The performance of the two methods is investigated relative
to the properties coherence, precision, bias, universality, simplicity. A
proposal to define error limits in various cases is derived from the
comparison. It is based on the likelihood function only and follows in most
cases the general practice in high energy physics. Classical methods are
discarded because they violate the likelihood principle, they can produce
physically inconsistent results, suffer from a lack of precision and
generality. Also the extreme Bayesian approach with arbitrary choice of the
prior probability density or priors deduced from scaling laws is rejected.


title:
Inclusive production of omega mesons at large transverse momenta in
  pi-Be interactions at 515 GeV/c

abstract:
  We present results on the production of omega mesons at high transverse
momenta in pi^-Be interactions at 515 GeV/c. The data span the kinematic range
3.5 < p_T < 8 GeV/c. We compare the measured cross section with expectations
from Monte Carlo QCD generators. The relative yield of omega to pi^0 mesons is
used to extract the ratio of vector to pseudoscalar meson production for the
first generation of quarks.


title: TESLA*HERA as Lepton (Photon)-Hadron Collider

abstract:
  New facilities for particle and nuclear physics research, which will be
available due to constructing the TESLA linear electron-positron collider
tangentially to the HERA proton ring, are discussed.


title:
Measurement of the flux of atmospheric muons with the CAPRICE94
  apparatus

abstract:
  A new measurement of the momentum spectra of both positive and negative muons
as function of atmospheric depth was made by the balloon-borne experiment
CAPRICE94. The data were collected during ground runs in Lynn Lake on the
19-20th of July 1994 and during the balloon flight on the 8-9th of August 1994.
We present results that cover the momentum intervals 0.3-40 GeV/c for negative
muons and 0.3-2 GeV/c for positive muons, for atmospheric depths from 3.3 to
1000 g/cm**2, respectively. Good agreement is found with previous measurements
for high momenta, while at momenta below 1 GeV/c we find latitude dependent
geomagnetic effects. These measurements are important cross-checks for the
simulations carried out to calculate the atmospheric neutrino fluxes and to
understand the observed atmospheric neutrino anomaly.


title: Current status of K2K long-baseline neutrino-oscillation experiment

abstract:
  The K2K (KEK to Kamioka) long-baseline neutrino-oscillation experiment was
successfully started in early 1999. A total intensity of 7.20 x 10^18 protons
on target, which is about 7% of the goal of the experiment, was accumulated in
39.4 days of data-taking in 1999. We obtained 3 neutrino events in the fiducial
volume of the Super-Kamiokande detector, whereas the expectation based on
observations in the front detectors is 12.3 +1.7/-1.9. An analysis of
oscillation searches from the view points of absolute event numbers, distortion
of neutrino energy spectrum, and nu_e/nu_mu ratio is in progress.


title: Linac*LHC based ep, gamma-p, eA, gamma-A and FEL gamma-A Colliders

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


title:
Direct Measurement of the W Boson Width in ppbar Collisions at roots =
  1.8 TeV

abstract:
  This Letter describes a direct measurement of the $W$ boson total decay
width, $\gw$, using the Collider Detector at Fermilab. The measurement uses an
integrated luminosity of $90\invpb$, collected during the 1994--1995 run of the
Fermilab Tevatron $p\pbar$ collider. The width is determined by normalizing
predicted signal and background distributions to 49844 $\wenu$ candidates and
21806 $\wmunu$ candidates in the transverse-mass region $M_T<200\gev$ and then
fitting the predicted shape to the 438 electron events and 196 muon events in
the high-$M_T$ region, $100<M_T<200\gev$. The result is
$\Gamma_W=2.04\pm0.11$(stat)$\pm0.09$(syst)GeV.


title: The Scientific Need for a Scalar/Higgs Factory

abstract:
  The scalar sector of the electroweak theory can be probed by a mu^+mu^-
collider S channel resonance machine. We give arguments for when such a machine
may be needed and when this information could be obtained by the LHC detector.
A very interesting case is the possibility that several scalar particles are in
the same mass range for the supersymmetric Higgs bosons h, H, and A, which
would definitely require such a machine. The Higgs factory could follow the
construction of a neutrino factory.


title: Magnetic monopoles, nuclearites, Q-balls: a qualitative picture

abstract:
  We present qualitative pictures of the structures of magnetic monopoles
(MMs), nuclearites (nuggets of strange quark matter, strangelets, surrounded by
electrons) and Q-balls (supersymmetric states of squarks, sleptons and Higgs
fields). In particular we discuss the relation between their mass and size.
MMs, nuclearites and Q-balls could be part of the cold Dark Matter (DM); we
consider astrophysical limits on the flux of these particles in the cosmic
radiation.


title:
A Neutrino-Factory Muon Storage Ring to Provide Beams for Multiple
  Detectors Around the World

abstract:
  We briefly discuss the physics motivation for a neutrino factory with varying
baseline distances of about 1000 to 9000 km. We describe the amount of non
planarity of the storage ring required to service three or four detectors at
once. A novel bowtie storage ring is described that could in part provide these
beams; a preliminary lattice design is given. We give the space angles between
the various detector locations and possible sites for neutrino factories.
Finally we describe detectors at the Gran Sasso Laboratory and at a new
laboratory near Carlsbad, NM to observe the neutrino interactions with wrong
sign leptons.


title: Determination of the QCD Coupling $\alpha_s$

abstract:
  Theoretical basics and experimental determinations of the coupling parameter
of the Strong Interaction, $\alpha_s$, are reviewed. The world average value of
$\alpha_s$, expressed at the energy scale of the rest mass of the $Z^0$ boson,
is determined from analyses which are based on complete NNLO perturbative QCD.
The result is $\alpha_s (M_Z) = 0.1184 \pm 0.0031$. No significant deviations
or systematic biases of subsamples of experimental results are found. From the
observed energy dependence of $\alpha_s$, which is in excellent agreement with
the expectations of QCD, the number of colour degrees of freedom can be
constrained to $N_c = 3.03 \pm 0.12$.


title:
Charged Higgs Mass Limits from the Charged Kaon and Tau to Kaon
  Branching Fractions

abstract:
  From an analysis of the current world averages of the charged kaon and tau to
kaon branching fractions, we derive, within the framework of type II Higgs
doublets models such as the Minimal Supersymmetric Extension of the Standard
Model, $\tan{\beta}/m_H < 0.21$ GeV$^{-1}$ at a 90% confidence limit.


title:
Exclusive Leptoproduction of rho^0 Mesons from Hydrogen at Intermediate
  Virtual Photon Energies

abstract:
  Measurements of the cross section for exclusive virtual-photoproduction of
rho^0 mesons from hydrogen are reported. The data were collected by the HERMES
experiment using 27.5 GeV positrons incident on a hydrogen gas target in the
HERA storage ring. The invariant mass W of the photon-nucleon system ranges
from 4.0 to 6.0 GeV, while the negative squared four-momentum Q^2 of the
virtual photon varies from 0.7 to 5.0 GeV^2. The present data together with
most of the previous data at W > 4 GeV are well described by a model that
infers the W-dependence of the cross section from the dependence on the Bjorken
scaling variable x of the unpolarized structure function for deep-inelastic
scattering. In addition, a model calculation based on Off-Forward Parton
Distributions gives a fairly good account of the longitudinal component of the
rho^0 production cross section for Q^2 > 2 GeV^2.


title:
Design, construction, and operation of SciFi tracking detector for K2K
  experiment

abstract:
  We describe the construction and performance of a scintillating fiber
detector used in the near detector for the K2K (KEK to Kamioka, KEK E362) long
baseline neutrino oscillation experiment. The detector uses 3.7 m long and
0.692 mm diameter scintillating fiber coupled to image-intensifier tubes (IIT),
and a CCD camera readout system. Fiber sheet production and detector
construction began in 1997, and the detector was commissioned in March, 1999.
Results from the first K2K runs confirm good initial performance : position
resolution is estimated to be about 0.8 mm, and track finding efficiency is $98
\pm 2$ % for long tracks (i.e., those which intersect more than 5 fiber
planes). The hit efficiency was estimated to be $92 \pm 2$ % using cosmic-ray
muons, after noise reduction at the offline stage. The possibility of using the
detector for particle identification is also discussed.


title:
Measurements of spin rotation parameter A in pion-proton elastic
  scattering at 1.62 GeV/c

abstract:
  The ITEP-PNPI collaboration presents the results of the measurements of the
spin rotation parameter A in the elastic scattering of positive and negative
pions on protons at P_beam = 1.62 GeV/c. The setup included a
longitudinally-polarized proton target with superconductive magnet, multiwire
spark chambers and a carbon polarimeter with thick filter. Results are compared
to the predictions of partial wave analyses. The experiment was performed at
the ITEP proton synchrotron, Moscow.


title:
A High-Precision Measurement of the Left-Right Z Boson Cross-Section
  Asymmetry

abstract:
  We present a measurement of the left-right cross-section asymmetry (ALR) for
Z boson production by e+e- collisions. The measurement includes the final data
taken with the SLD detector at the SLAC Linear Collider (SLC) during the period
1996-1998. Using a sample of 383,487 Z decays collected during the 1996-1998
runs we measure the pole-value of the asymmetry, ALR0, to be 0.15056+-0.00239
which is equivalent to an effective weak mixing angle of sin2th(eff) =
0.23107+-0.00030. Our result for the complete 1992-1998 dataset comprising 537
thousand Z decays is sin2th(eff) = 0.23097+-0.00027.


title:
Measurement of J/Psi and Psi(2S) Polarization in ppbar Collisions at
  sqrt(s) = 1.8 TeV

abstract:
  We have measured the polarization of J/Psi and Psi(2S) mesons produced in
p\bar{p} collisions at \sqrt{s} = 1.8 TeV, using data collected at CDF during
1992-95.
  The polarization of promptly produced J/Psi [Psi(2S)] mesons is isolated from
those produced in B-hadron decay, and measured over the kinematic range 4[5.5]
< P_T < 20 GeV/c and |y| < 0.6. For P_T \gessim 12 GeV/c we do not observe
significant polarization in the prompt component.


title:
Measurements of Charm Fragmentation into $D_s^{*+}$ and $D_s^+$ in
  $e^+e^-$ Annihilations at $\sqrt{s}$=10.5 GeV

abstract:
  A study of charm fragmentation into $D_s^{*+}$ and $D_s^+$ in $e^+e^-$
annihilations at $\sqrt{s}$=10.5 GeV is presented. This study using $4.72 \pm
0.05$ fb$^{-1}$ of CLEO II data reports measurements of the cross-sections
$\sigma(D_s^{*+})$ and $\sigma(D_s^+)$ in momentum regions above $x=0.44$,
where $x$ is the $D_s$ momentum divided by the maximum kinematically allowed
$D_s$ momentum. The $D_s$ vector to vector plus pseudoscalar production ratio
is measured to be $P_V(x(D_s^+)>0.44)=0.44\pm0.04$


title: Noncontact measurement of the tension of a wire

abstract:
  We present a scheme for noncontact measurement of the tension of a wire, such
as that in a drift chamber or straw tube detector.


title: Energy losses of Q-balls in Matter, Earth and Detectors

abstract:
  We present a sudy of the interactions of Q-balls with matter, and their
energy losses in the earth, for a large range of velocities. These calculations
are used to computethe fractional geometrical acceptance of underground
detectors. Furthermore we computed the light yield in liquidscintillators, the
ionization in streamer tubes and the Restricted Energy Loss in nuclear track
detectors.


title: A Search for the Electric Dipole Moment of the Tau-Lepton

abstract:
  Using the ARGUS detector at the e+e- storage ring DORIS II, we have searched
for the real and imaginary part of the electric dipole formfactor d_tau of the
tau lepton in the production of tau pairs at q^2=100 GeV^2. This is the first
direct measurement of this CP violating formfactor. We applied the method of
optimised observables which takes into account all available information on the
observed tau decay products. No evidence for CP violation was found, and we
derive the following results: Re(d_tau)=(1.6+-.9)*10^(-16) ecm and
Im(d_tau)=(-0.2+-0.8)*10^(-16) ecm, where statistical and systematic errors
have been combined.


title: Study of exclusive two-body B0 meson decays to charmonium

abstract:
  We present a study of three B0 decay modes useful for time-dependent CP
asymmetry measurements. From a sample of 9.7 million B meson pairs collected
with the CLEO detector, we have reconstructed B0 -> J/psi K0S, B0 -> chi_c1
K0S, and B0 -> J/psi pi0 decays. The latter two decay modes have been observed
for the first time. We describe a K0S -> pi0 pi0 detection technique and its
application to the reconstruction of the decay B0 -> J/psi K0S. Combining the
results obtained using K0S -> pi+ pi- and K0S -> pi0 pi0 decays, we determine
Br(B0 -> J/psi K0) = (9.5 +- 0.8 +- 0.6)*10^-4, where the first uncertainty is
statistical and the second one is systematic.
  We also obtain Br(B0 -> chi_c1 K0)= (3.9 +1.9/-1.3 +- 0.4)*10^-4 and Br(B0 ->
J/psi pi0) = (2.5 +1.1/-0.9 +- 0.2)*10^-5.


title:
Measurement of the product branching fraction
  B(c->Theta_c)*B(Theta_c->/\X)

abstract:
  Based on an a high statistics e+e- -> ccbar data sample, we report on the
inclusive rate for charmed baryons to decay into / particles using charm-event
tagging. We select e+e- -> ccbar events which have a clear anti-charm tag and
measure the / content in the hemisphere opposite the tag (charge conjugate
modes are implicit). This allows us to determine the product branching
fraction: B(/)=B(c->Theta_c)*B(Theta_c->/\X), where Theta_c represents a sum
over all charmed baryons produced in e+e- fragmentation at sqrt(s)=10.5 GeV,
given our specific tags. We obtain B(/)=(1.87+/-0.03+/-0.33)%


title: A measurement of lifetime differences in the neutral D-meson system

abstract:
  Using a high statistics sample of photoproduced charm particles from the
FOCUS experiment at Fermilab, we compare the lifetimes of neutral D mesons
decaying via D0 to K- pi+ and K- K+ to measure the lifetime differences between
CP even and CP odd final states. These measurements bear on the phenomenology
of D0 - D0bar mixing. If the D0 to K-pi+ is an equal mixture of CP even and CP
odd eigenstates, we measure yCP = 0.0342 \pm 0.0139 \pm 0.0074.


title: Searches for Compositeness at the Tevatron

abstract:
  Quark-quark and quark-lepton searches for compositenss at the Fermilab
Tevatron are summarized. These are of the contact-interaction variety where
sqrt(s-hat) < the hypothesized mass scales, Lambda. Tevatron experiments limit
a variety of compositeness phenomena in the range from 1.9 to 8.3 TeV. These
limits result from measurements of: the Ht spectrum (D0), dijet mass (D0),
dijet angular distribution (CDF, D0), drell-yan production (CDF, D0), and the
Neutral Current to Charged Current ratio (CCFR/NuTeV).


title: Measurements of Z0 Electroweak Couplings at SLD

abstract:
  We present a summary of the results of several electroweak measurements
performed by the SLD experiment at the Stanford Linear Collider (SLC). Most of
these results are preliminary and are based, unless otherwise indicated, on the
full 1993-8 data set of approximately 550,000 hadronic decays of Z0 bosons
produced with an average electron beam polarization of 73%.


title:
Photonic events with missing energy in e+e- collisions at sqrt(s)=189
  GeV

abstract:
  Photonic events with large missing energy have been observed in e+e-
collisions at a centre-of-mass energy of 189GeV using the OPAL detector at LEP.
Results are presented for event topologies consistent with a single photon or
with an acoplanar photon pair. Cross-section measurements are performed within
the kinematic acceptance of each selection, and the number of light neutrino
species is measured. Cross-section results are compared with the expectations
from the Standard Model process e+e- to nu nubar + photon(s). No evidence is
observed for new physics contributions to these final states. Upper limits are
derived on sigma(e+e- to XY).BR(X to Y gamma) and sigma(e+e- to XX).BR**2(X to
Y gamma) for the case of stable and invisible Y. These limits apply to single
and pair production of excited neutrinos (X=nu*, Y = nu), to neutralino
production (X=neutralino_2, Y=neutralino_1) and to supersymmetric models in
which X = neutralino_1 and Y = light gravitino. The case of macroscopic decay
lengths of particle X is considered for e+e- to XX, X to Y gamma, when M_Y is
of order zero. The single-photon results are also used to place upper limits on
superlight gravitino pair production as well as graviton-photon production in
the context of theories with additional space dimensions.


title: Results from the CRESST Dark Matter Search at Gran Sasso

abstract:
  We present the current status of CRESST(Cryogenic Rare Event Search using
Superconducting Thermometers) project and new results concerning the
development of new detectors based on the simultaneous measurement of phonons
and scintillation light. A significant reduction in the background rate could
recently be achieved. With our newly developed method for the simultaneous
measurement of scintillation light, strong background discrimination is
possible also in larger detectors, resulting in a substantial increase in WIMP
detection sensitivity.


title: Examining CP Symmetry in Strange Baryon Decays

abstract:
  Non-conservation of CP symmetry can manisfest itself in non-leptonic hyperon
decays as a difference in the decay parameter between the strange-baryon decay
and its charge conjugate. By comparing the decay distribution in the $\Lambda$
helicity frame for the decay sequence $\Xi^{-} \to \Lambda \pi^{-}$, $\Lambda
\to p \pi^{-}$ with that of $\bar{\Xi}^{+}$ decay, E756 at Fermilab did not
observe any CP-odd effect at the $10^{-2}$ level. The status of a follow-up
experiment, HyperCP (FNAL E871), to search for CP violation in charged
$\Xi-\Lambda$ decay with a sensitivity of $10^{-4}$ is also presented.


title: Improved Experimental Limits on the Production of Magnetic Monopoles

abstract:
  We present new limits on low mass accelerator-produced point-like Dirac
magnetic monopoles trapped and bound in matter surrounding the D\O collision
region of the Tevatron at Fermilab (experiment E-882). In the context of a
Drell-Yan mechanism, we obtain cross section limits for the production of
monopoles with magnetic charge values of 1, 2, 3, and 6 times the minimum Dirac
charge of the order of picobarns, some hundred times smaller than found in
similar previous Fermilab searches. Mass limits inferred from these cross
section limits are presented.


title:
Neutrino Radiation Challenges and Proposed Solutions for Many-TeV Muon
  Colliders

abstract:
  Neutrino radiation is expected to impose major design and siting constraints
on many-TeV muon colliders. Previous predictions for radiation doses at TeV
energy scales are briefly reviewed and then modified for extension to the
many-TeV energy regime. The energy-cubed dependence of lower energy colliders
is found to soften to an increase of slightly less than quadratic when averaged
over the plane of the collider ring and slightly less than linear for the
radiation hot spots downstream from straight sections in the collider ring.
Despite this, the numerical values are judged to be sufficiently high that any
many-TeV muon colliders will likely be constructed on large isolated sites
specifically chosen to minimize or eliminate human exposure to the neutrino
radiation. It is pointed out that such sites would be of an appropriate size
scale to also house future proton-proton and electron-positron colliders at the
high energy frontier, which naturally leads to conjecture on the possibilities
for a new world laboratory for high energy physics. Radiation dose predictions
are also presented for the speculative possibility of linear muon colliders.
These have greatly reduced radiation constraints relative to circular muon
colliders because radiation is only emitted in two pencil beams directed along
the axes of the opposing linacs.


title: Mighty MURINEs: Neutrino Physics at Very High Energy Muon Colliders

abstract:
  An overview is given of the potential for neutrino physics studies through
parasitic use of the intense high energy neutrino beams that would be produced
at future many-TeV muon colliders. Neutrino experiments clearly cannot compete
with the collider physics. Except at the very highest energy muon colliders,
the main thrust of the neutrino physics program would be to improve on the
measurements from preceding neutrino experiments at lower energy muon
colliders, particularly in the fields of B physics, quark mixing and CP
violation. Muon colliders at the 10 TeV energy scale might already produce of
order 10^8 B hadrons per year in a favorable and unique enough experimental
environment to have some analytical capabilities beyond any of the currently
operating or proposed B factories. The most important of the quark mixing
measurements at these energies might well be the improved measurements of the
important CKM matrix elements |V_ub| and |V_cb| and, possibly, the first
measurements of |V_td| in the process of flavor changing neutral current
interactions involving a top quark loop. Muon colliders at the highest
center-of-mass energies that have been conjectured, 100--1000 TeV, would
produce neutrino beams for neutrino-nucleon interaction experiments with
maximum center-of-mass energies from 300--1000 GeV. Such energies are
comparable to the 314 GeV center-of-mass energy for electron-proton scattering
at the HERA collider, but the luminosity would would be several orders of
magnitude larger. This would potentially open up the possibility for high
statistics studies of any exotic particles, such as leptoquarks, that might
have been previously discovered at these energy scales.


title: Prospects for Colliders and Collider Physics to the 1 PeV Energy Scale

abstract:
  A review is given of the prospects for future colliders and collider physics
at the energy frontier. A proof-of-plausibility scenario is presented for
maximizing our progress in elementary particle physics by extending the energy
reach of hadron and lepton colliders as quickly and economically as might be
technically and financially feasible. The scenario comprises 5 colliders beyond
the LHC -- one each of e+e- and hadron colliders and three muon colliders --
and is able to hold to the historical rate of progress in the log-energy reach
of hadron and lepton colliders, reaching the 1 PeV constituent mass scale by
the early 2040's. The technical and fiscal requirements for the feasibility of
the scenario are assessed and relevant long-term R&D projects are identified.
Considerations of both cost and logistics seem to strongly favor housing most
or all of the colliders in the scenario in a new world high energy physics
laboratory


title: A measurement of the tau mass and the first CPT test with tau leptons

abstract:
  We measure the mass of the tau lepton to be 1775.1+-1.6(stat)+-1.0(syst.) MeV
using tau pairs from Z0 decays. To test CPT invariance we compare the masses of
the positively and negatively charged tau leptons. The relative mass difference
is found to be smaller than 3.0 10^-3 at the 90% confidence level.


title: Measurement of elastic electroproduction of phi mesons at HERA

abstract:
  The elastic electroproduction of phi mesons is studied at HERA with the H1
detector for photon virtualities 1 < Q^2 < 15 GeV^2 and hadronic centre of mass
energies 40 < W < 130 GeV. The Q^2 and t dependences of the cross section are
extracted (t being the square of the four-momentum transfer to the target
proton). When plotted as function of (Q^2 + M_V^2) and scaled by the
appropriate SU(5) quark charge factor, the phi meson cross section agrees
within errors with the cross sections of the vector mesons V = rho, omega and
J/psi. A detailed analysis is performed of the phi meson polarisation state and
the ratio of the production cross sections for longitudinally and transversely
polarised phi mesons is determined. A small but significant violation of
s-channel helicity conservation (SCHC) is observed.


title: Measurements of the Sigma_c^0 and Sigma_c^{++} Mass Splittings

abstract:
  Using a high statistics sample of photoproduced charmed particles from the
FOCUS experiment at Fermilab (FNAL-E831), we measure the mass splittings of the
charmed baryons Sigma_c^0 and Sigma_c^{++}. We find M(Sigma_c^0 - Lambda_c^+) =
167.38 +/- 0.21 +/- 0.13 MeV/c^2 and M(Sigma_c^++ - Lambda_c^+) = 167.35 +/-
0.19 +/- 0.12 MeV/c^2 with samples of 362 +/- 36 and 461 +/- 39 events,
respectively. We measure the isospin mass splitting M(Sigma_c^++ - Sigma_c^0)
to be -0.03 +/- 0.28 +/- 0.11 Mev/c^2. The first errors are statistical and the
second are systematic.


title:
Run II Jet Physics: Proceedings of the Run II QCD and Weak Boson Physics
  Workshop

abstract:
  The Run II jet physics group includes the Jet Algorithms, Jet Shape/Energy
Flow, and Jet Measurements/Correlations subgroups. The main goal of the jet
algorithm subgroup was to explore and define standard Run II jet finding
procedures for CDF and DO. The focus of the jet shape/energy flow group was the
study of jets as objects and the energy flows around these objects. The jet
measurements/correlations subgroup discussed measurements at different beam
energies; strong coupling constant measurements; and LO, NLO, NNLO, and
threshold jet calculations. As a practical matter the algorithm and
shape/energy flow groups merged to concentrate on the development of Run II jet
algorithms that are both free of theoretical and experimental difficulties and
able to reproduce Run I measurements.
  Starting from a review of the experience gained during Run I, the group
considered a variety of cone algorithms and KT algorithms. The current
understanding of both types of algorithms, including calibration issues, are
discussed in this report along with some preliminary experimental results. The
jet algorithms group recommends that CDF and DO employ the same version of both
a cone algorithm and a KT algorithm during Run II. Proposed versions of each
type of algorithm are discussed. The group also recommends the use of full
4-vector kinematic variables whenever possible. The recommended algorithms
attempt to minimize the impact of seeds in the case of the cone algorithm and
preclustering in the case of the KT algorithm. Issues regarding precluster
definitions and merge/split criteria require further study.


title:
Precise Measurement of $B^{0}\to \bar{B^{0}$ Mixing Parameters at the
  $\Upsilon($S)$

abstract:
  We describe a measurement of B^0-B^0bar mixing parameters exploiting a method
of partial reconstruction of the decay chains B0 -> D^{*-}\pi^+ and B0 ->
D^{*-}\rho^+. Using 9.6 x 10^6 BBbar pairs collected at the Cornell Electron
Storage Ring, we find \chi_d = 0.198 +- 0.013 +- 0.014, |y_d|<0.41 at 95%
confidence level, and |Re(\epsilon_B)|<0.034 at 95% confidence level.


title: 16-N as a calibration source for Super-Kamiokande

abstract:
  The decay of 16-N is used to cross check the absolute energy scale
calibration for solar neutrinos established by the electron linear accelerator
(LINAC). A deuterium-tritium neutron generator was employed to create 16-N via
the (n,p) reaction on 16-O in the water of the detector. This technique is
isotropic and has different systematic uncertainties than the LINAC. The
results from this high statistics data sample agree with the absolute energy
scale of the LINAC to better than 1%. A natural source of 16-N from the capture
of mu^- on 16-O, which is collected as a background to the solar neutrino
analysis, is also discussed.


title: The ttbar Threshold and Machine Parameters at the NLC

abstract:
  One of the problems in the design of a high energy e+e- linear collider is
the distribution of the luminosity as a function of real collision energy,
dL/dE, due to initial state radiation, beamstrahlung, and the energy spread of
the collider. These effects smear a sharp feature in the cross section of e+e-
-> hadrons such as the ttbar threshold into a flatter structure. This study
reviews the impact on dL/dE of these effects as a function of machine
parameters, explores some methods of measuring dL/dE with Bhabha scattering,
how the dL/dE flattens the ttbar cross section near threshold, and the effect
the dL/dE measurement has on extracting parameters of the top quark, such as
the mass and width, in a 2.5/fb scan of the ttbar threshold.


title: An Improved Limit on the Rate Of Decay K+ -> pi+ mu+ e-

abstract:
  The experiment E865 at BNL places an upper limit on the branching ratio for
the decay K+ -> pi+ mu+ e- of 3.9x10^-11 (90% C.L.). Along with with other
results this yields a combined upper limit on this branching ratio of
2.8x10^-11. A new upper limit on the branching ratio for pi0 -> mu+ e- of
3.8x10^-10 (90% C.L.) is also established. The experiment and analysis are
described.


title: The $\phi(1020)\to\pi^0\pi^0\gamma$ decay

abstract:
  In the SND experiment at VEPP-2M $e^+e^-$ collider the
$\phi(1020)\to\pi^0\pi^0\gamma$ decay was studied and its branching ratio was
measured: $B(\phi\to\pi^0\pi^0\gamma)=(1.221\pm 0.098\pm0.061)\cdot10^{-4}$. It
was shown, that $f_0(980)\gamma$ intermediate state dominates in this decay and
the $f_0(980)$-meson parameters were obtained.


title: Measurement of the Proton Structure Function F_2 at Very Low Q^2 at HERA

abstract:
  A measurement of the proton structure function F_2(x,Q^2) is presented in the
kinematic range 0.045 GeV^2 < Q^2 < 0.65 GeV^2 and 6*10^{-7} < x < 1*10^{-3}.
The results were obtained using a data sample corresponding to an integrated
luminosity of 3.9pb^-1 in e^+p reactions recorded with the ZEUS detector at
HERA. Information from a silicon-strip tracking detector, installed in front of
the small electromagnetic calorimeter used to measure the energy of the
final-state positron at small scattering angles, together with an enhanced
simulation of the hadronic final state, has permitted the extension of the
kinematic range beyond that of previous measurements. The uncertainties in F_2
are typically less than 4%. At the low Q^2 values of the present measurement,
the rise of F_2 at low x is slower than observed in HERA data at higher Q^2 and
can be described by Regge theory with a constant logarithmic slope. The
dependence of F_2 on Q^2 is stronger than at higher Q^2 values, approaching, at
the lowest Q^2 values of this measurement, a region where F_2 becomes nearly
proportional to Q^2.


title:
Expected Coverage of Bayesian Confidence Intervals for the Mean of a
  Poisson Statistic in Measurements with Background

abstract:
  Expected coverage and expected length of 90% upper and lower limit and 68.27%
central intervals are plotted as functions of the true signal for various
values of expected background. Results for several objective priors are shown,
and formulas for calculation of confidence intervals are obtained. For
comparison, expected coverage and length of frequentist intervals constructed
with the unified approach of Feldman and Cousins and a simple classical method
are also shown. It is assumed that the expected background is accurately known
prior to performing an experiment. The plots of expected coverage and length
are provided for values of signal and background typical for particle
experiments with small numbers of events.


title: New Phenomena II: Recent Results from the Fermilab Tevatron

abstract:
  The CDF and D\O collaborations continue to search for new physics using more
than 100~pb$^{-1}$ of \xxbar{p} collisions at $\sqrt{s}=1.8$ TeV collected at
the Fermilab Tevatron. We present recent results from both experiments on
R-parity violating Supersymmetry and $Z'$/Technicolor production with $ee$ and
\xxbar{t} final states. In addition we introduce Sherlock, a new
quasi-model-independent search strategy.


title:
Measurements of F2, xF3nu-xF3nub from CCFR neutrino-Fe and
  antineutrino-Fe data in a model independent way

abstract:
  We report on the extraction of the structure functions F2 and Delta xF3 =
xF3nu-xF3nub from CCFR neutrino-Fe and antineutrino-Fe differential cross
sections. The extraction is performed in a physics model independent (PMI) way.
This first measurement for Delta xF3 which is useful in testing models of heavy
charm production, is higher than current theoretical predictions. The F2 (PMI)
values measured in neutrino and muon scattering are in good agreement with the
predictions of Next to Leading Order PDFs (using massive charm production
schemes), thus resolving the long-standing discrepancy between the two sets of
data.


title: Cornering Higgs Bosons at LEP

abstract:
  The most recent results of the searches for Higgs bosons in the data taken at
LEP in 1999 and their interpretation in a variety of theoretical framework are
reviewed.