title:
Measurement of the longitudinal and transverse cross-section in e^+e^-
  annihilation at sqrt(s)=35-44 GeV

abstract:
  An investigation of the polar angle distribution of charged hadrons is
presented using data taken by the JADE experiment at the PETRA e^+e^- collider
at centre-of-mass energies of 35 and 44 GeV. From fits to the polar angle
distribution the longitudinal, sigma_L, and transverse, sigma_T, cross-section
relative to the total hadronic are determined at an average energy scale of
36.6 GeV. The results are sigma_L/sigma_tot = 0.067 +/- 0.013,
sigma_T/sigma_tot = 0.933 -/+ 0.013 where total errors are given and the
results are exactly anti-correlated. Using the next-to-leading order QCD
prediction for the longitudinal cross-section, the value alpha_S(36.6 GeV) =
0.150 +/- 0.025 of the strong coupling constant is obtained in agreement with
the world average value of alpha_S evolved to an energy scale of 36.6 GeV.


title: Deeply Virtual Compton Scattering at H1 and ZEUS

abstract:
  Results on Deeply Virtual Compton Scattering at HERA measured by the H1 and
ZEUS Collaborations are presented. The cross section, measured for the first
time, is reported for $Q^2 > 2 GeV^2$, $30 < W < 120 GeV$ and $|t| < 1 GeV^2$.


title:
Measurement of the Beam-Spin Azimuthal Asymmetry Associated with
  Deeply-Virtual Compton Scattering

abstract:
  The beam-spin asymmetry in hard electroproduction of photons has been
measured for the first time. The data have been accumulated by the HERMES
experiment at DESY using the HERA 27.6 GeV longitudinally polarized positron
beam and an unpolarized hydrogen gas target. The asymmetry in the azimuthal
distribution of the produced photons in the angle phi relative to the lepton
scattering plane was determined with respect to the helicity state of the
incoming positron beam. The beam-spin analyzing power in the sin(phi) moment
was measured to be -0.23 +/- 0.04(stat) +/- 0.03(syst) in the missing-mass
range below 1.7 GeV. The observed asymmetry is attributed to the interference
of the Bethe-Heitler and deeply-virtual Compton scattering processes.


title: Implications of the Tevatron Jet Results on PDF

abstract:
  We report a new measurement of the pseudorapidity (eta) and transverse-
energy (Et) dependence of the inclusive jet production cross section in pbar p
collisions at sqrt(s)=1.8 TeV using 95 pb**-1 of data collected with the D0
detector at the Fermilab Tevatron. The differential cross section d^2sigma/(dEt
deta) is presented up to |eta|=3, significantly extending previous
measurements. The results are in good overall agreement with next-to-leading
order predictions from QCD, indicate a preference for certain parton
distribution functions, and provide the world's best constraint on the gluon
distribution at high parton momentum fraction x.


title: Photoproduction with a Leading Proton at HERA

abstract:
  The total cross section for the photoproduction process with a leading proton
in the final state has been measured at gamma p centre-of-mass energies W of
91, 181 and 231 GeV. The measured cross sections apply to the kinematic range
with the transverse momentum of the scattered proton restricted to p_Tproton <=
0.2 GeV and 0.68 <= z <= 0.88, where z = E_p'/E_p is the scattered proton
energy normalised to the beam energy. The cross section dsigma_(gamma p ->
Xp')(W,z)/dz is observed to be independent of W and z within the measurement
errors and amounts to 8.05 +- 0.06 stat +- 0.89 syst mub on average. The data
are well described by a Triple Regge model in which the process is mediated by
a mixture of exchanges with an effective Regge trajectory of intercept
alpha_i(0)=0.33 +- 0.04 stat +- 0.04 syst. The total cross section for the
interaction of the photon with this mixture (gamma alpha_i -> X) can be
described by an effective trajectory of intercept alpha_k(0)=0.99 +- 0.01 stat
+- 0.05 syst. Predictions based on previous triple Regge analyses of pp-> pX
data assuming vertex factorisation are broadly consistent with the gamma p
data. The measured cross sections are compared with deep inelastic scattering
leading proton data in the same region of z and pT_proton for photon virtuality
Q^2 > 2.5 GeV^2. The ratio of the cross section for leading proton production
to the total cross section is found to rise with Q^2.


title:
A new measurement of K+(e4) decay and the s-wave pi-pi-scattering length
  a00

abstract:
  A sample of 400000 events from the decay K+->pi+pi-e+nu(e)(K(e4)) has been
collected in experiment E865 at the Brookhaven AGS. The analysis of these data
yields new measurements of the K(e4) branching ratio
(4.11+-0.01+-0.11)*10**(-5)), the s-wave pi-pi scattering length
a00=0.228+-0.012+-0.003, and the form factors F, G, and H of the hadronic
current and their dependence on the invariant pi-pi mass.


title:
Multiple Jet Production at Low Transverse Energies in pbarp Collisions
  at sqrt(s) = 1.8 TeV

abstract:
  We present data on multiple jet production for transverse energies greater
than 20 GeV in pbarp collisions at sqrt(s) = 1.8 TeV. QCD calculations in the
parton shower approximation (PYTHIA) and in the next-to-leading order
approximation (JETRAD) show discrepancies with data for three and four-jet
production. This disagreement is especially apparent in multiple jet angular
and transverse momentum distributions.


title: Measurements of Single W Production at LEP2

abstract:
  In the energy region of LEP2 and above, four fermion final states in e+e-
collisions can be produced by Feynman diagrams involving two, one or zero
resonant bosons...


title: Higgs Discovery before LHC?

abstract:
  The proposed Run IIb of the Tevatron Collider will provide 15 fb-1 worth of
ppbar data at c.o.m energy of 2 TeV per experiment by year 2007. We review the
plans of the Tevatron accelerator complex upgrade and the plans for the
upgrades of the experiments to match this challenge. Perspectives for the
discovery of an Higgs particle are reviewed and the concrete possibility of a 5
sigmas discovery for a low mass Higgs are discussed.


title:
Measurement of the quadratic slope parameter in the K_L -> 3\pi^0 decay
  Dalitz plot

abstract:
  A value of (-6.1 +- 0.9_{stat} +- 0.5_{syst})*10^{-3} is obtained for the
quadratic slope parameter h in the K_L -> 3\pi^0 decay Dalitz plot at the NA48
experiment at the CERN SPS. The result is based on 14.7*10^6 fully
reconstructed K_L -> 3\pi^0 -> 6\gamma decays. This is the most precise
measurement of any of the Dalitz plot slope parameters in the charged and
neutral kaon decays so far.


title: Color Transparency at COMPASS - Feasibility Study

abstract:
  We examine the potential of the COMPASS experiment at CERN to study color
transparency via exclusive vector meson production in hard muon-nucleus
scattering. It is demonstrated that COMPASS has high sensitivity to test this
important prediction of perturbative QCD.


title:
Modified Breit-Wigner formula for mesonic resonances describing OZI
  decays of confined $q\bar{q}$ states and the light scalar mesons

abstract:
  A general expression resembling Breit-Wigner formulae is derived for the
description of resonances which appear in meson-meson scattering. Starting
point is a unitarised meson model, but reduced to a simpler form and freed from
the specific assumption about the confining force. The parameters of the
resulting ``Resonance-Spectrum Expansion'' are directly related to the
confinement spectrum and the mechanism of $^3P_0$ valence-quark-pair creation
for OZI-allowed hadronic decay, and not to the central positions and widths of
resonances. The method also provides a straightforward explanation for the
origin of the light scalar mesons without requiring extra degrees of freedom.


title: Three-Jet Production in Deep-Inelastic Scattering at HERA

abstract:
  Three-jet production is studied for the first time in deep-inelastic
positron-proton scattering. The measurement carried out with the H1 detector at
HERA covers a large range of four-momentum transfer squared 5 < Q^2 < 5000
GeV^2 and invariant three-jet masses 25 < M_(3jet) < 140 GeV. Jets are defined
by the inclusive k_T algorithm in the Breit frame. The size of the three-jet
cross section and the ratio of the three-jet to the dijet cross section R_(3/2)
are described over the whole phase space by the predictions of perturbative QCD
in next-to-leading order. The shapes of angular jet distributions deviate
significantly from a uniform population of the available phase space but are
well described by the QCD calculation.


title:
The onset of the anomalous J/psi suppression in Pb-Pb collisions at the
  CERN SPS

abstract:
  The J/psi suppression observed by the NA50 experiment is one of the most
striking signatures for quark gluon plasma formation in Pb-Pb collisions at 158
AGeV. The J/psi production has been studied as a function of the centrality of
the collision estimated via the forward energy EZDC released in a zero degree
calorimeter (ZDC). The study of the correlation between the number of
participant nucleons in the collisions, Npart, and EZDC allows to check whether
the J/psi suppression pattern vs. EZDC is compatible with a sudden J/psi
suppression mechanism expressed as a function of Npart.


title: Multiplicity Fluctuations in DIS

abstract:
  The charged multiplicity fluctuations in deep-inelastic scattering (DIS) are
investigated to test perturbative QCD and local parton hadron duality (LPHD).
The fluctuations were measured with the ZEUS detector at HERA in restricted
phase space domains in the current Breit frame region. The measurements are
compared to analytic pQCD + LPHD predictions and QCD-based Monte Carlo models.


title:
Measurement of charm production in deep inelastic scattering with the
  ZEUS detector

abstract:
  We present measurements of charm production in DIS using the ZEUS detector.
Data with an integrated luminosity of 83 pb$^{-1}$ have been analysed. For the
channel $D^{*+} \to D^{0}\pi_{s}^{+} \to K^{-}\pi^{+}\pi_{s}^{+} (+ c.c.)$ a
cross section has been extracted, differential in the kinematical variables
$Q^{2}$ and Bjorken $x$. In addition the decay $\overline{c}q \to
e^-\overline{\nu}_e X$ has been studied in a data sample of an integrated
luminosity of 34 pb$^{-1}$. This results in a cross section, differential in
$Q^2$,$x$ and $W$ of the event and in $p_{T}$ and $\eta$ of the decay electron.
The structure function f2-charm has also been determined for this channel. All
measured cross sections show good agreement with NLO pQCD predictions from
HVQDIS.


title: A Brief Review of Future Lepton-Hadron and Photon-Hadron Colliders

abstract:
  Options for future $lepton-proton,lepton-nucleus,\gamma -proton,\gamma
-nucleus$ and FEL$\gamma -nucleus$ colliders are discussed. In the spirit of
this content, we consider TESLAxHERA, LEPxLHC, $\mu$xTEVATRON, exRHIC,
LinacxLHC, $\sqrt{s}=3TeV$ $\mu p$ and CLIC based colliders.

categories: hep-ex hep-ph nucl-ex nucl-th physics.acc-ph


title: The NuMI Hadronic Hose

abstract:
  The Neutrinos at the Main Injector (NuMI) beam supplies an intense
$\nu_{\mu}$ beam to the Main Injector Neutrino Oscillation Search (MINOS). The
$\nu_{\mu}$'s are derived from a secondary $\pi^+$ beam that is allowed to
decay within a 675 m decay tunnel. As part of this effort, we are developing a
continuous toroidal magnetic focusing system, called the Hadronic Hose, to
better steer the secondary beam. The Hose will both increase the net neutrino
flux reaching the MINOS detectors and reduce systematic differences in the
neutrino energy spectra at the two detectors due to solid angle acceptances.


title: Measuring the Phases of G_E and G_M of the Nucleon

abstract:
  The nucleon electromagnetic form factors G_E and G_M are complex quantities
in the time-like region. The absolute values can be determined by measuring the
angular distribution of the nucleons in e^+ e^- --> N N-bar. The complex phase
can only be determined by measuring one or more polarizations of the initial or
final state. For PEP-N, we can use unpolarized e+ and e- and measure the
polarization of one of the outgoing nucleons.


title: Experimental Status of Photon Photon into Baryon Antibaryon Pairs

abstract:
  The exclusive production of baryon antibaryon pairs in the collisions of two
quasi-real photons have been studied in different experiments at e+e-
colliders. Results are presented for the processes gamma gamma to proton
antiproton and gamma gamma to lambda antilambda. The cross-section measurements
are compared with the recent analytic calculations based on the quark-diquark
model predictions. Monte Carlo studies have been done to investigate the PEP-N
expectations for the gamma gamma to proton antiproton process.


title: Why Do Solar Neutrino Experiments Below 1 Mev

abstract:
  I discuss why we need solar neutrino experiments below 1 MeV. I also express
my prejudices about the desired number and types of such experiments,
emphasizing the importance of p-p solar neutrino experiments


title: Hints of Higgs Boson Production at LEP

abstract:
  An excess of signal-like events above the expected background, corresponding
to approximately three standard deviations, was observed in the search for the
standard model Higgs boson at LEP in 2000. This excess is consistent with the
existence of a 115GeV/c2 Higgs particle.


title: Hadron Formation in DIS in a nuclear environment

abstract:
  The influence of the nuclear medium on the production of charged hadrons in
semi-inclusive deep inelastic scattering has been studied by the HERMES
experiment at DESY using 27.5 GeV positrons.
  A substantial reduction of the multiplicity of charged hadrons and identified
charged pions from nuclei relative to that from deuterium has been measured as
function of the relevant kinematic variables. The preliminary results on
krypton show a larger reduction of the multiplicity ratio $R_M^{h}$ with
respect to the one previously measured on nitrogen and suggest a possible
modification of the quark fragmentation process in the nuclear environment.


title: An Experimentalist's View of Neutrino Oscillations

abstract:
  Neutrinos, and primarily neutrino oscillations, have undoubtedly been one of
the most exciting topics in the field of high-energy physics over the past few
years. The existence of neutrino oscillations would require an extension of the
currently accepted description of sub-nuclear phenomena beyond the Standard
Model. Compelling evidence of new physics, which seems to be pointing towards
neutrino oscillations, is coming from the solar neutrino deficit and from the
atmospheric neutrino anomaly. More controversial effects have been observed
with artificially produced neutrinos. The present experimental status of
neutrino oscillations is reviewed, as well as the planned future experimental
programme, which, it is hoped, will solve most of the outstanding puzzles.


title:
Primary cosmic ray chemical composition in the energy region around
  10**16 eV investigated by means of gamma-hadron families

abstract:
  Primary Cosmic Ray Chemical Composition is investigated in energy region
close to 10**16 eV. Studies are based on comparisons of gamma-hadron families
observed by Pamir and Pamir-Chacaltaya Collaboration, with families generated
by means of quasi-scaling model MC0. It is shown, that all characteristics of
observed families, including their intensity, are in a very good agreement with
simulated event properties at the normal chemical composition and are in
disagreement at heavy dominant compositions. Code CORSICA with VENUS and DPM
models also contradicts with experimental data of families. One- and
multi-dimensional methods of recognition of Fe-like families is worked up and
approved. They are based on family characteristics sensitive to atomic number
of induced nuclei and are not correlated between each others. It is shown that
the fraction of Fe-like families is consistent with the normal chemical
composition and strongly contradicts to heavy dominant ones. The success of MC0
model, in description of families properties, is due to large inelasticity
coefficient of soft interactions at superhigh energies.


title: Measurements of hadronic structure functions of the photon at LEP

abstract:
  The present status of the measurements of hadronic structure functions of the
photon, investigated in deep inelastic electron-photon scattering at LEP, is
presented. This article covers the hadronic structure function F_2^gamma of
quasi-real photons as well as the structure function of virtual photons.
Special emphasis is given to new developments in the analysis and to the most
recent measurements.


title: Preliminary trigger studies for the PEP-N detector

abstract:
  A very preliminary study for a trigger for the PEP-N experiment is presented.
Its aim is to show the feasibility of a very efficient trigger for
multihadronic events based on energy releases in the electromagnetic
calorimeter. Though the efficiency of such a trigger is very high and simple
topology requirements can be applied to reduce cosmic background, an accurate
study of machine background is going to be made to provide final trigger design
and performance.


title: D0-D0bar Mixing in FOCUS

abstract:
  We report on a direct measurement of the mixing parameter
y=(3.42+-1.39+-0.74)% in the D0-D0bar system by measuring the lifetime
difference between the CP mixed final state K^+pi^- and the CP even state
K^+K^-. We also present a study of the decay \ws based on a sample of 149+-31
observed events compared to 36760+-195 events observed in the Cabibbo favored
channel D0->K^-pi^+. The observed branching ratio R=(0.404+-0.085+-0.025)% is
used to obtain limits on the mixing parameters x' and y' and the doubly Cabibbo
suppressed branching ratio, R_DCS. These studies are based on a large sample of
photoproduced charm mesons from the FOCUS experiment at Fermilab (FNAL-E831).


title:
How robust is the result of the Standard Model Higgs boson search at
  LEP?

abstract:
  An excess of signal-like events above the expected background, corresponding
to approximately three standard deviations, was observed in the search for the
Standard Model Higgs boson at LEP in 2000. This excess is consistent with the
existence of a Higgs boson with mass 115GeV/c2. Relevant consistency and
robustness checks, which further support the signal interpretation, are
presented.


title: Search for Direct CP Violation in B -> K pi Decays

abstract:
  We search for direct CP violation in flavor specific B -> K pi decays by
measuring the rate asymmetry between charge conjugate modes. The search is
performed on a data sample of 11.1 million B B bar events recorded on the
Upsilon(4S) resonance by the Belle experiment at KEKB. We measure 90%
confidence intervals in the partial rate asymmetry A_CP of -0.25 < A_CP(K-/+
pi+/-) < 0.37, -0.40 < A_CP(K-/+ pi^0) < 0.36, and -0.53 < A_CP(K^0 pi-/+) <
0.82. By combining the K-/+ pi+/- and K-/+ pi^0 final states, we conclude that
-0.22 < A_CP[K-/+(pi+/- + pi^0)] < 0.25 at the 90% confidence level.


title: New Directions in Data Analysis

abstract:
  In the next decade, high energy physicists will use very sophisticated
equipment to record unprecedented amounts of data in the hope of making major
advances in our understanding of particle phenomena. Some of the signals of new
physics will be small, and the use of advanced analysis techniques will be
crucial for optimizing signal to noise ratio. I will discuss new directions in
data analysis and some novel methods that could prove to be particularly
valuable for finding evidence of any new physics, for improving precision
measurements and for exploring parameter spaces of theoretical models.


title: Exotic searches at LEP

abstract:
  In the last five years, the operation of the LEP accelerator has provided the
HEP community with a unique opportunity to search for physics beyond the
standard model at the typical energy scale of $~200$ GeV. Although most of the
data analysis has been focused on the traditional sectors of Higgs and
gravity-mediated SUSY physics, a considerable effort has been dedicated by
ALEPH, DELPHI L3 and OPAL to the search for more exotic physics scenarios,
which go from gauge-mediated supersymmetry breaking, to compositeness, to
gravitational extra-dimensions. This talk reviews the latest experimental
results on a selection of final states which are believed to be of particular
interest for exotic physics or which present some anomaly in the data with
respect to standard model expectations.


title: Diffractive Production of Neutral Vector Mesons at THERA

abstract:
  We consider the contribution to our understanding of vacuum-exchange
processes to be made by investigations at the proposed electron-proton collider
THERA. Recent results have highlighted the value of such studies for testing
quantum chromodynamical descriptions of both long-range and short-range strong
interactions. Stringent quantitative constraints have been provided by
exploiting the opportunity to correlate scaling behaviour with helicity
selection in exclusive and semi-exclusive vector-meson production. After
reviewing the progress achieved by the measurement programs presently being
carried out by the H1 and ZEUS collaborations at HERA, we discuss the
performance criteria imposed by such investigations on the THERA accelerator
complex and on the detector design. We conclude that the study of vector-meson
production will form an essential component of the THERA physics program
beginning with the early turn-on stage of the machine and continuing throughout
the achievement of its full high-luminosity potential.


title: Advanced Analysis Methods in High Energy Physics

abstract:
  During the coming decade, high energy physics experiments at the Fermilab
Tevatron and around the globe will use very sophisticated equipment to record
unprecedented amounts of data in the hope of making major discoveries that may
unravel some of Nature's deepest mysteries. The discovery of the Higgs boson
and signals of new physics may be around the corner. The use of advanced
analysis techniques will be crucial in achieving these goals. I will discuss
some of the novel methods of analysis that could prove to be particularly
valuable for finding evidence of any new physics, for improving precision
measurements and for exploring parameter spaces of theoretical models.


title:
Measurement of the hadronic cross section at KLOE using the radiative
  return

abstract:
  We report on the measurement of the hadronic cross section below 1GeV at the
electron-positron-collider DAPHNE, using the multiple purpose detector KLOE.
The radiative return, which is due to initial state radiation (e+ e- \to gamma
+ hadrons), allows us to obtain the cross section for variable
center-of-mass-energies of the hadronic system from the 2m_pi threshold up to
1.02GeV. This measurement can be performed while DAPHNE is running with a fixed
accelerator energy on the phi mass (1.02 GeV). For the exclusive process e+ e-
\to pi+ pi- gamma, the status of the analysis and first preliminary results of
the invariant mass spectrum of the two-pion-state are presented.


title: Precision Measurement of Muon g-2 at BNL

abstract:
  The Muon (g-2) Experiment (E821) at Brookhaven National Laboratory (BNL) has
measured the anomalous magnetic moment of the positive muon to an unprecedented
precision of 1.3 parts per million. The result, a_{\mu^+} = (g-2)/2 = 11 659
202(14)(6) X 10^{-10}, is based on data recorded in 1999 and is in good
agreement with previous measurements. Upcoming analysis of data recorded in
2000 and 2001 will substantially reduce the uncertainty on this measurement.
Comparison of the new world average experimental value with the most
comprehensive Standard Model calculation, a_\mu(SM) = 11 659 159.6(6.7) X
10^{-10}, yields a difference of a_\mu(exp)-a_\mu(SM) = 43(16) X 10^{-10}.


title:
Final NOMAD results on nu_mu->nu_tau and nu_e->nu_tau oscillations
  including a new search for nu_tau appearance using hadronic tau decays

abstract:
  Results from the nu_tau appearance search in a neutrino beam using the full
NOMAD data sample are reported. A new analysis unifies all the hadronic tau
decays, significantly improving the overall sensitivity of the experiment to
oscillations. The "blind analysis" of all topologies yields no evidence for an
oscillation signal. In the two-family oscillation scenario, this sets a 90%
C.L. allowed region in the sin^2(2theta)-Delta m^2 plane which includes
sin^2(2theta)<3.3 x 10^{-4} at large Delta m^2 and Delta m^2 < 0.7 eV^2/c^4 at
sin^2(2theta)=1. The corresponding contour in the nu_e->nu_tau oscillation
hypothesis results in sin^2(2theta)<1.5 x 10^{-2} at large Delta m^2 and Delta
m^2 < 5.9 eV^2/c^4 at sin^2(2theta)=1. We also derive limits on effective
couplings of the tau lepton to nu_mu or nu_e.


title: Test of CPT and Lorentz invariance from muonium spectroscopy

abstract:
  Following a suggestion of Kostelecky et al. we have evaluated a test of CPT
and Lorentz invariance from the microwave spectroscopy of muonium. Hamiltonian
terms beyond the standard model violating CPT and Lorentz invariance would
contribute frequency shifts $\delta\nu_{12}$ and $\delta\nu_{34}$ to $\nu_{12}$
and $\nu_{34}$, the two transitions involving muon spin flip, which were
precisely measured in ground state muonium in a strong magnetic field of 1.7 T.
The shifts would be indicated by anti-correlated oscillations in $\nu_{12}$ and
$\nu_{34}$ at the earth's sidereal frequency. No time dependence was found in
$\nu_{12}$ or $\nu_{34}$ at the level of 20 Hz, limiting the size of some CPT
and Lorentz violating parameters at the level of $2\times10^{-23}$ GeV,
representing Planck scale sensitivity and an order of magnitude improvement in
sensitivity over previous limits for the muon.


title:
Sub MeV Particles Detection and Identification in the MUNU detector
  ((1)ISN, IN2P3/CNRS-UJF, Grenoble, France, (2)Institut de Physique,
  Neuch\^atel, Switzerland, (3) INFN, Padova Italy, (4) Physik-Institut,
  Z\"{u}rich, Switzerland)

abstract:
  We report on the performance of a 1 m$^{3}$ TPC filled with CF$_{4}$ at 3
bar, immersed in liquid scintillator and viewed by photomultipliers. Particle
detection, event identification and localization achieved by measuring both the
current signal and the scintillation light are presented. Particular features
of $\alpha$ particle detection are also discussed. Finally, the ${54}$Mn
photopeak, reconstructed from the Compton scattering and recoil angle is shown.


title: B0_d - anti-B0_d Mixing and CPT tests at Belle

abstract:
  We present results on the mixing parameter Delta-m_d and tests of the CPT
symmetry in the B0_d anti-B0_d mixing from the time evolution of dilepton
events on the Upsilon(4S) resonance. The analysis is based on a 5.9 fb^{-1}
data sample collected by the Belle detector at the KEKB accelerator from
January to July of 2001. We obtain Delta-m_d = 0.463 +- 0.008 (stat) +- 0.016
(syst) ps^{-1}. No evidence for CPT violation is found. This is the first
determination of Delta-m_d from time evolution measurements at Upsilon(4S), and
the first time that an experimental limit on |m_{B0_d} - m_{anti-B0_d}| /
m_{B0_d} has been obtained.


title: Diffractive Jet Production in DIS - Testing QCD Factorisation

abstract:
  A measurement is presented of diffractive dijet production in deep-inelastic
scattering (DIS) interactions at HERA of the type ep-->eXY, where the X system
is separated by a large rapidity gap from a low-mass leading baryonic system Y.
The data are consistent with QCD factorisation in diffractive DIS and yield
tight constraints on both shape and normalisation of the diffractive gluon
distribution. The data are able to distinguish between various models for
diffractive DIS and are in agreement with a 2-gluon exchange calculation at
small x-pom values.


title:
Measurement of the z- and x-dependence of the Mean Transverse Momentum
  of Charged Hadrons, Charged Pions and K_s^0 at HERMES

abstract:
  The mean transverse momenta of hadrons, <P_{\bot}>, produced in e^+ N deep
inelastic scattering was studied as a function of the hadron energy fraction z
and the Bjorken variable x. The statistical accuracy of the HERMES data
permitted to observe at high z differences in <P_{\bot}> between hadrons with
positive and negative charges, h^+, h^- and K_s^0 for the first time. These
differences can presumably be explained by the flavour dependence of the
intrinsic transverse momentum distributions of quarks in the initial nucleon.


title: Three-jet production in diffractive deep inelastic scattering at HERA

abstract:
  Three-jet production in the reaction ep --> eXp has been studied with the
ZEUS detector at HERA using an integrated luminosity of 42.74 pb^-1. The data
were measured in the kinematic region 5 < Q^2 < 100 GeV^2, 200 < W < 250 GeV
and 23 < M_X < 40 GeV. The diffractive signal was selected by requiring a large
rapidity gap in the outgoing proton direction. Jets were reconstructed in the
centre-of-mass system of X using the exclusive k_T-algorithm. A sample of
three-jet events in diffraction has been identified. Differential cross
sections were measured as a function of the jet pseudorapidity and jet
transverse momentum with respect to the virtual photon-Pomeron axis. The jets
going in the Pomeron direction are broader than those going in the
virtual-photon direction. This is consistent with models predicting that gluons
are predominantly produced in the Pomeron direction and quarks in the
virtual-photon direction.


title: Measurement of Deeply Virtual Compton Scattering at HERA

abstract:
  A measurement is presented of elastic Deeply Virtual Compton Scattering e^+ +
p -> e^+ + photon + p at HERA using data taken with the H1 detector. The cross
section is measured as a function of the photon virtuality, Q^2, and the
invariant mass, W, of the gamma p system, in the kinematic range 2 < Q^2 < 20
GeV^2, 30 < W < 120 GeV and |t| < 1 GeV^2, where t is the squared momentum
transfer to the proton. The measurement is compared to QCD based calculations.


title: A novel concept for a anti nu_e Neutrino Factory

abstract:
  The evolution of neutrino physics demands new schemes to produce intense,
collimated and pure neutrino beams. The current neutrino factory concept
implies the production, collection, and storage of muons to produce beams of
muon and electron neutrinos at equal intensities at the same time. Research and
development addressing its feasibility are still going on. In the current
paper, we propose a new neutrino factory concept, that could possibly achieve
beams of similar intensity, perfectly known energy spectrum and a single
neutrino avour, electron anti- neutrino. The scheme relies on existing
technology.


title:
Measurement of the $\overline{p}p \to K_S K_S \eta$ cross section at
  beam momenta in the regions of 1.45 and 1.7 GeV/c

abstract:
  The PS185 experiment at LEAR/CERN has investigated strangeness production in
antiproton-proton collisions with final states such as $\overline{\Lambda}
\Lambda$, $\overline{\Sigma}^0 \Lambda + c.c$, $\overline{\Sigma^+} \Sigma^+$,
$\overline{\Sigma^-} \Sigma^-$ and $K_S K_S$. Results are presented from a
study of about 32,000 {$K_S K_S X$} events obtained at several antiproton
momenta in the regions of 1.45 and 1.7 GeV/c. The $\overline{p} p \to K_S K_S
\eta$ cross sections extracted at these momenta constitute the first
measurement of this reaction in flight and are broadly consistent with
expectations of a phase-space extrapolation of branching ratios from
annihilation at rest.


title:
Search for Quark-Lepton Compositeness and a Heavy Wprime Boson Using the
  e-nu Channel in p-pbar Collisions at sqrt(s) = 1.8 TeV

abstract:
  We present searches for quark-lepton compositeness and a heavy W' boson at
high electron-neutrino transverse mass. We use ~110/pb of data collected in
p-pbar collisions at sqrt(s) = 1.8 TeV by the CDF collaboration during
1992--95.
  The data are consistent with standard model expectations.
  Limits are set on the quark-lepton compositeness scale Lambda and the ratio
of partial cross sections sigma (W' -> e nu) / sigma (W -> e nu). The cross
section ratio is used to obtain a lower limit on the mass of a W' boson with
standard model couplings.
  We exclude Lambda < 2.81 TeV and a W' boson with mass below 754 GeV/c^2 at
the 95% confidence level. We combine the W' mass limit with our previously
published limit obtained using the muon channel, to exclude a W' boson with
mass below 786 GeV/c^2 at the 95% confidence level.


title: Final results from the Palo Verde Neutrino Oscillation Experiment

abstract:
  The analysis and results are presented from the complete data set recorded at
Palo Verde between September 1998 and July 2000. In the experiment, the
$\nuebar$ interaction rate has been measured at a distance of 750 and 890 m
from the reactors of the Palo Verde Nuclear Generating Station for a total of
350 days, including 108 days with one of the three reactors off for refueling.
Backgrounds were determined by (a) the $swap$ technique based on the difference
between signal and background under reversal of the positron and neutron parts
of the correlated event and (b) making use of the conventional reactor-on and
reactor-off cycles. There is no evidence for neutrino oscillation and the mode
$\nuebar\to\bar\nu_x$ was excluded at 90% CL for $\dm>1.1\times10^{-3}$ eV$^2$
at full mixing, and $\sinq>0.17$ at large $\dm$.


title:
A Multifunctional Processing Board for the Fast Track Trigger of the H1
  Experiment

abstract:
  The electron-proton collider HERA is being upgraded to provide higher
luminosity from the end of the year 2001. In order to enhance the selectivity
on exclusive processes a Fast Track Trigger (FTT) with high momentum resolution
is being built for the H1 Collaboration. The FTT will perform a 3-dimensional
reconstruction of curved tracks in a magnetic field of 1.1 Tesla down to 100
MeV in transverse momentum. It is able to reconstruct up to 48 tracks within 23
mus in a high track multiplicity environment. The FTT consists of two hardware
levels L1, L2 and a third software level. Analog signals of 450 wires are
digitized at the first level stage followed by a quick lookup of valid track
segment patterns.
  For the main processing tasks at the second level such as linking, fitting
and deciding, a multifunctional processing board has been developed by the ETH
Zurich in collaboration with Supercomputing Systems (Zurich). It integrates a
high-density FPGA (Altera APEX 20K600E) and four floating point DSPs (Texas
Instruments TMS320C6701). This presentation will mainly concentrate on second
trigger level hardware aspects and on the implementation of the algorithms used
for linking and fitting. Emphasis is especially put on the integrated CAM
(content addressable memory) functionality of the FPGA, which is ideally suited
for implementing fast search tasks like track segment linking.


title:
Fractions of proton, helium, middle and heavy nuclei in primary cosmic
  rays at energy 10**16eV

abstract:
  Classification of gamma-hadron families, registered by the Pamir
collaboration, on four groups of nuclei (P, He, middle and heavy), responsible
for their generation, is made, and fractions of families in each of the groups
are estimated. Results show, that below the knee of the energy spectrum the
chemical composition of primary cosmic rays remains close to the normal one.


title:
Measurement of the ratio of differential cross sections for W and Z
  boson production as a function of transverse momentum in pbar p collisions at
  sqrt(s)=1.8 TeV

abstract:
  We report on a measurement of the ratio of the differential cross sections
for W and Z boson production as a function of transverse momentum in
proton-antiproton collisions at sqrt(s) = 1.8 TeV. This measurement uses data
recorded by the D0 detector at the Fermilab Tevatron in 1994-1995. It
represents the first investigation of a proposal that ratios between W and Z
observables can be calculated reliably using perturbative QCD, even when the
individual observables are not. Using the ratio of differential cross sections
reduces both experimental and theoretical uncertainties, and can therefore
provide smaller overall uncertainties in the measured mass and width of the W
boson than current methods used at hadron colliders.


title: Observation of CP violation in the B^0 meson system

abstract:
  We present an updated measurement of time-dependent CP-violating asymmetries
in neutral B decays with the BABAR detector at the PEP-II asymmetric B Factory
at SLAC. This result uses an additional sample of Upsilon(4S) decays collected
in 2001, bringing the data available to 32 million B-anti-B pairs. We select
events in which one neutral B meson is fully reconstructed in a final state
containing charmonium and the flavor of the other neutral B meson is determined
from its decay products. The amplitude of the CP-violating asymmetry, which in
the Standard Model is proportional to sin2beta, is derived from the decay time
distributions in such events. The result sin2beta = 0.59 +/- 0.14 (stat) +/-
0.05 (syst) establishes CP violation in the B^0 meson system. We also determine
|lambda| = 0.93 +/- 0.09 {stat} +/- 0.03 {syst}, consistent with no direct CP
violation.


title: Search for Heavy Isosinglet Neutrino in e+e- Annihilation at LEP

abstract:
  We report on a search for the first generation heavy neutrino that is an
isosinglet under the standard SU(2)_L gauge group. The data collected with the
L3 detector at center-of-mass energies between 130 GeV and 208 GeV are used.The
decay channel N_e --> eW is investigated and no evidence is found for a heavy
neutrino, N_e, in a mass range between 80 GeV and 205 GeV. Upper limits on the
mixing parameter between the heavy and light neutrino are derived.


title:
Search for Heavy Neutral and Charged Leptons in e+ e- Annihilation at
  LEP

abstract:
  A search for exotic unstable neutral and charged heavy leptons as well as for
stable charged heavy leptons is performed with the L3 detector at LEP.
Sequential, vector and mirror natures of heavy leptons are considered. No
evidence for their existence is found and lower limits on their masses are set.


title: Measurement of Vub using b hadron semileptonic decays

abstract:
  The magnitude of the CKM matrix element Vub is determined by measuring the
inclusive charmless semileptonic branching fraction of beauty hadrons at OPAL
based on b -> Xu l nu event topology and kinematics. This analysis uses OPAL
data collected between 1991 and 1995, which correspond to about four million
hadronic Z decays. We measure Br(b -> Xu l) to be (1.63 +/- 0.53 +0.55/-0.62) x
10^(-3). The first uncertainty is the statistical error and the second is the
systematic error. From this analysis, Vub is determined to be:
  |Vub| = (4.00 +/- 0.65(stat) +0.67/-0.76(sys) +/- 0.19(HQE)) x 10^(-3).
  The last error represents the theoretical uncertainties related to the
extraction of |Vub| from Br(b -> Xu l) using the Heavy Quark Expansion.


title:
Searches for Leptoquarks, Squarks in $\not R_p$ SUSY and Excited
  Fermions at HERA

abstract:
  Various searches for leptoquarks, scalar quarks in $R_p$-violating
supersymmetric models, and excited fermions performed by the HERA experiments
H1 and ZEUS are reviewed. No evidence for new particle production was observed
from data collected by both experiments since 1994 in either electron-proton
and positron-proton collisions. Stringent limits derived on the masses and
couplings of these new particles are compared whenever appropriate with those
from LEP, the Tevatron and low energy experiments.


title: A first Design of the Pep-N Calorimeter

abstract:
  A preliminary design of the PEP-N electromagnetic calorimeter is given. The
spatial,energy and time resolutions achievable using a KLOE type
electromagnetic calorimeter are presented.


title:
Measurement of the B^0 and B^+ meson lifetimes with fully reconstructed
  hadronic final states

abstract:
  The B0 and B+ meson lifetimes have been measured in e+e- annihilation data
collected in 1999 and 2000 with the BABAR detector at center-of-mass energies
near the Upsilon(4S) resonance. Events are selected in which one B meson is
fully reconstructed in a hadronic final state while the second B meson is
reconstructed inclusively. A combined fit to the B0 and the B+ decay time
difference distributions yields tau_{B0} = 1.546 +/- 0.032 (stat) +/-
0.022(syst) ps, tau_{B+} = 1.673 +/- 0.032 (stat) +/- 0.023 (syst) ps and
tau_{B+} / tau_{B0} = 1.082 +/- 0.026 (stat) +/- 0.012 (syst).


title: Studies of K0S decays with the KLOE detector at DAFNE

abstract:
  The KLOE detector at DAFNE has collected about 30 pb-1 by the end of year
2000,' allowing, among other things, accurate measurements on several decay
channels of the K0S meson.
  With data acquired in the year 2000 run we have measured the ratio of the
branching ratios of the K0S to two charged and neutral pions to 1.5 percent
accuracy.
  The branching ratio of the semileptonic decay of the K0S is also measured to
5 percent accuracy, the best measurement of this BR to date.


title: Search for the Decay $\Upsilon(1S)\to \gamma\eta^{'}$

abstract:
  We report on a search for the radiative decay U(1S) -> gamma + eta' in 61.3
pb^-1 of data taken with the CLEO II detector at the Cornell Electron Storage
Ring. Three decay chains were investigated, all involving eta' -> pi+ pi- +
eta, followed by eta -> gamma + gamma, eta -> pi0 + pi0 + pi0, or eta -> pi+ +
pi- + pi0. We find no candidate events in any of the three cases and set a
combined upper limit of 1.6 x 10^-5 at 90% C.L., significantly smaller than the
previous limit. We compare our result to other radiative U(1S) decays, to
radiative J/psi decays, and to theoretical predictions.


title:
Detection of phi --> eta' photon, phi --> eta photon in pi+ pi- three
  photons final state with KLOE at DAFNE

abstract:
  KLOE has collected about 30 pb^-1 in year 2000 at the DAFNE collider, which
yields the largest population of phi meson radiative decays studied so far. We
present the result obtained for phi-->eta photon and phi -->eta' photon: the
ratio of these two BR's has been measured to be (5.3 +- 0.5 +- 0.3) times
10^-3, leading to a very accurate determination of the mixing angle in the
flavor basis (40 +1.7 -1.5 degrees) and to the most accurate determination of
BR(phi -->eta' photon) to date: (6.8 +- 0.6 +-0.5) times 10^-5.


title: Measuring the Hadronic Cross Section at KLOE using the Radiative Return

abstract:
  We present a study of the reaction e+e- \to pi+pi-gamma at the phi peak with
the KLOE detector at the phi-factory DAPHNE. This reaction allows us to obtain
the cross section for \e+e- \to pi+pi- from the e+e- center-of-mass energy W =
m_\phi = 1019 MeV down to threshold, i.e. 2m_pi < M_(pipi) < m_phi. This is
called radiative return. The status of the analysis and preliminary results on
the invariant mass spectrum of the two-pion-state are presented.


title:
Detection of phi-->f0(980) photon, phi-->a0(980) photon into five
  photons final state with KLOE at DAFNE

abstract:
  The KLOE detector at DAFNE, the Frascati phi-factory, has collected about 30
pb^-1 by the end of 2000, corresponding to about 90 millions of phi(1020)
mesons produced. The five photon final state has been exploited to study the
rare decays of phi into f0(980) photon and a0(980) photon, with statistical
accuracy never reached before. The preliminary results for these branching
ratios, from a data sample of 17 pb^-1, are the following: BR(phi-->f0(980)
photon)=(23.7 +- 0.6 (stat.) times 10^-5, BR(phi--> a0(980) photon)=(5.8 +- 0.5
(stat.)) times 10^-5. The systematic error is expected to be less than 10%, a
precise evaluation is going on. For the ratio of the branching ratios of phi-->
f0 photon to phi--> a0 photon we find 4.1 +- 0.4 (stat.).


title:
Measurement of branching fractions for exclusive B decays to charmonium
  final states

abstract:
  We report branching fraction measurements for exclusive decays of charged and
neutral B mesons into two-body final states containing a charmonium meson. We
use a sample of 22.72 +/- 0.36 million B anti-B events collected between
October 1999 and October 2000 with the BABAR detector at the PEP-II storage
rings at the Stanford Linear Accelerator Center. The charmonium mesons
considered here are J/psi, psi(2S), and chi_c1, and the light meson in the
decay is either a K, K^*, or pi^0.


title: Search for the Rare Decays B --> Kl^+l^- and B --> K^*(892)l^+ l^-

abstract:
  We present preliminary results from a search for the flavor-changing neutral
current decays B-->Kl^+l^- and B-->K^*(892)l^+l^- using a sample of 22.7 x 10^6
Upsilon(4S)-->B anti-B decays collected with the BABAR detector at the PEP-II B
Factory. We have reconstructed the following final states: B^+ --> K^+l^+l^-,
B^0 --> K^0l^+l^- (K_s^0 --> pi^+pi^-), B^+ --> K^{*+}l^+l^- (K^{*+} --> K_s^0
pi^+), and B^0 --> K^{*0}l^+l^- (K^{*0} --> K^+pi^-), where l^+l^- is either an
e^+e^- or mu^+mu^- pair. We obtain the 90% C.L. upper limits BF(B --> Kl^+l^-)<
0.6 x 10^{-6} and BF(B --> K^*l^+l^-)<2.5 x 10^{-6}, close to the Standard
Model predictions for these branching fractions.


title:
Study of $\ep\en$ Collisions in the 1.5-3 Gev C.M. Energy Region Using
  Isr at \babar

abstract:
  A preliminary analysis of low-energy $\ep\en$ collision data produced via
initial state radiation (ISR) has been performed using 22 $fb^{-1}$ of \babar
\~data. The selection of data samples corresponding to the $\mumu$, $\pipi$,
$\kk$, $p \bar p$, $\kk\pi^0$, 3$\pi$, 4$\pi$, 5$\pi$, 6$\pi$, 7$\pi$ final
states accompanied by the emitted ISR hard photon has been demonstrated. The
invariant mass of the hadronic final state defines the effective collision c.m.
energy, and so \babar ISR data can be compared to the relevant direct $\ep\en$
measurements. The resulting distributions are already competitive with DCI and
ADONE data in the 1.4-3.0 GeV energy range. In particular, they do not suffer
from the relative normalization uncertainties observed for certain reactions
when results from different experiments are combined. Eventually, such data may
be used to measure the energy dependence of R, the ratio of the $\ep\en\to
hadrons$ and $\ep\en\to\mumu$ cross sections, in the low-energy regime where
precise measurements will have an impact on the interpretation of the new
$(g-2)_{\mu}$ measurements.


title:
DRAFT: Photoproduction of the $\rho^0$ meson on the proton at large
  momentum transfer

abstract:
  The differential cross section, $d\sigma/dt$, for $\rho^0$ meson
photoproduction on the proton above the resonance region ($2.6<W<2.9$ GeV) was
measured up to a momentum transfer $-t = 5$ GeV$^2$ using the CLAS detector at
the Thomas Jefferson National Accelerator Facility. The $\rho^0$ channel was
extracted from the measured two charged-pion cross section by fitting the
$\pi^+\pi^-$ and $p\pi^+$ invariant masses. The low momentum transfer region
shows the typical diffractive pattern expected from Reggeon-exchange. The
flatter behavior at large -t cannot be explained solely in terms of
QCD-inspired two-gluon exchange models. The data indicate that other processes,
like quark interchange, are important to fully describe $\rho$ photoproduction.


title: Search for the Standard Model Higgs Boson at LEP

abstract:
  The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have collected 2465
pb-1 of e+e- collision data at energies between 189 and 209 GeV, of which 542
pb-1 were collected above 206 GeV. Searches for the Standard Model Higgs boson
have been performed by each of the LEP collaborations. Their data have been
combined and examined for their consistency with the Standard Model background
and various Standard Model Higgs boson mass hypotheses. A lower bound of 114.1
GeV has been obtained at the 95% confidence level for the mass of the Higgs
boson. The likelihood analysis shows a preference for a Higgs boson with a mass
of 115.6 GeV. At this mass, the probability for the background to generate the
observed effect is 3.4%.


title:
Searches for the Neutral Higgs Bosons of the MSSM: Preliminary Combined
  Results Using LEP Data Collected at Energies up to 209 GeV

abstract:
  In the year 2000 the four LEP experiments collected data at centre-of-mass
energies between 200 and 209 GeV, integrating approximately 870 pb-1 of
luminosity, with about 510 pb-1 above 206 GeV. The LEP working group for Higgs
boson searches has combined these data with data sets collected previously at
lower energies. In representative scans of the parameters of the Minimal
Supersymmetric Standard Model (MSSM), the mass limits mh>91.0 GeV and mA>91.9
GeV are obtained for the light CP-even and the CP-odd neutral Higgs boson,
respectively. For a top quark mass less than or equal to 174.3 GeV, assuming
that the stop quark mixing is maximal, and choosing conservative values for
other SUSY parameters affecting the Higgs sector, the range 0.5<tanbeta<2.4 is
excluded. Additionally, the results of flavour-independent searches for
hadronically decaying Higgs bosons are included, allowing exclusion of MSSM
models with suppressed decays of the Higgs bosons to pairs of b quarks.


title:
Search for Charged Higgs bosons: Preliminary Combined Results Using LEP
  data Collected at Energies up to 209 GeV

abstract:
  In the year 2000 the four LEP experiments have collected 870 pb-1 of data at
energies between 200 and 209 GeV, with about 510 pb-1 above 206 GeV. These data
have been combined with data sets collected earlier at lower energies. %The
following 95% confidence level bounds have been obtained. For charged Higgs
bosons predicted by two-doublet extensions of the Standard Model and decaying
only into the channels H+->csbar and tau+nutau, a lower mass bound of 78.6 GeV
is obtained, at the 95% confidence level.


title:
Searches for Invisible Higgs bosons: Preliminary combined results using
  LEP data collected at energies up to 209 GeV

abstract:
  In the year 2000 the four LEP experiments have collected data at energies
between 200 and 209 GeV, for approximately 868 pb-1 integrated luminosity. The
LEP working group for Higgs boson searches has combined these data with earlier
data sets collected at lower centre-of-mass energies to search for a neutral
CP-even Higgs boson, produced at the Standard Model rate, decaying into
"invisible" particles. No statistically significant excess has been observed
when compared to the Standard Model background prediction, and assuming that
the Higgs boson decays only into such states a lower bound has been set on its
mass at 95% confidence level of 114.4 GeV.


title: Measurement of Ab_FB using inclusive b-hadron decays

abstract:
  Based on a sample of four million events collected by ALEPH from 1991 to
1995, a measurement of the forward-backward asymmetry in Z -> b-barb decays
using inclusive final states is presented. High-performance tagging of b-barb
events in a wide angular range is achieved using neural network techniques. An
optimal hemisphere charge estimator is built by merging primary and secondary
vertex information, leading kaon identification and jet charge in a neural
network. The average charge asymmetry, the flavour tagging efficiencies and
mean b-hemisphere charges are measured from data and used to extract the pole b
asymmetry in the Standard Model A^{0,b}_{FB} = 0.1009 +- 0.0027 (stat) +-
0.0015 (syst), corresponding to a value of the effective weak mixing angle of
sin^2(theta_W^{eff}) = 0.23193 +- 0.00056.


title:
Flavour Independent Search for Hadronically Decaying Neutral Higgs
  Bosons at LEP

abstract:
  Hadronic decays of Higgs bosons, not necessarily into b-quarks, have been
searched for using data collected at LEP-2. Such searches are complementary to
the usual Standard Model Higgs searches and lead to more model-independence.
Preliminary results obtained by the four LEP collaborations are presented for
the hZ production mechanism (using the q-qbarq-qbar, q-qbarnu-nubar and
q-qbarl+l- channels) and combined for the first time.


title:
Searches for Higgs Bosons Decaying into Photons: Preliminary Combined
  Results Using LEP Data Collected at Energies up to 209 GeV

abstract:
  This note describes preliminary LEP-combined results of searches for Higgs
bosons decaying into photons. The analyses use data collected at sqrt(s)~88-209
GeV. Using the combined data for H -> gamma gamma, a lower bound of 108.2 GeV
is set at the 95% confidence level for the ``benchmark'' fermiophobic Higgs
boson.


title:
Measurement of the B^0-anti-B^0 oscillation frequency in hadronic B^0
  Decays

abstract:
  B^0-anti-B^0 flavor oscillations have been studied in 20.7 fb-1 of e^+e^-
annihilation data collected in 1999 and 2000 with the BABAR detector at
center-of-mass energies near the Upsilon(4S) resonance. The event sample
consists of one B^0 meson fully reconstructed in a hadronic decay mode, while
the flavor of the recoiling B^0 in the event is determined with a tagging
algorithm that exploits the correlation between the flavor of the heavy quark
and the charges of its decay products. By fitting the time development of the
observed mixed and unmixed final states, the B^0-anti-B^0 oscillation
frequency, Delta_md, is determined to be 0.519+/- 0.020+/- 0.016 ps^{-1}.


title:
Measurement of the exclusive branching fractions B^0 --> eta K^{*0) and
  B^+ --> eta K^{*+}

abstract:
  We present the results of searches for B decays to the two charmless two-body
final states B^0 --> eta K^{*0} and B^+ --> eta K^{*+}, based on 20.7 fb-1 of
data collected in 1999 and 2000 with the BABAR detector at PEP-II. We find the
branching fractions BF(B^0 --> eta K^{*0}) = (19.8^{+6.5}_{-5.6} +/- 1.7) x
10^{-6} and BF(B^+ --> eta K^{*+}) = (22.1^{+11.1}_{-9.2} +/- 3.3) x 10^{-6},
where the first error quoted is the statistical and the second systematic.


title: A Search for Leptoquark Bosons in e^-p Collisions at HERA

abstract:
  A search for scalar and vector leptoquarks coupling to first generation
fermions is performed in the H1 experiment at the ep collider HERA. The
analysis uses e^- p data collected in 1998 and 1999 at a centre-of-mass energy
of 320 GeV, corresponding to an integrated luminosity of 15 pb^-1. No evidence
for the direct production of such particles is found in a data sample with a
large transverse momentum final state electron or with large missing transverse
momentum, and constraints on leptoquark models are established. For a Yukawa
coupling of electromagnetic strength leptoquarks are excluded for masses up to
290 GeV. This analysis complements the leptoquark searches performed previously
using data collected whilst HERA was operating with positrons instead of
electrons.


title: Searches at HERA

abstract:
  Searches for physics beyond the Standard Model have been performed in
high-energy $e^{\pm}p$ collisions at HERA. No significant deviation from the
Standard Model has been observed while searching for contact interactions,
extra dimensions, leptoquarks, R-parity violating squarks and excited fermions.
Exclusion limits have been inferred which extend or complement bounds from
other colliders. The H1 collaboration has observed a puzzling excess of events
with an high $P_t$ isolated lepton and missing transverse momentum, and
interpretation as flavour changing neutral currents has been explored.


title: Measurement of the Xi_c+ Lifetime

abstract:
  The Xi_c+ lifetime is measured using 9.0 fb^{-1} of e+ e- annihilation data
collected on and just below the Upsilon(4S) resonance with the CLEO II.V
detector at CESR. The Xi_c+ lifetime is measured using an unbinned maximum
likelihood fit. The preliminary result for the Xi_c+ lifetime is (503 +- 47
(stat.) +- 18 (syst.)) fs.


title:
Near Muon Range Detector for the K2K Experiment -Construction and
  Performance-

abstract:
  A muon range detector (MRD) has been constructed as a near detector for the
KEK-to-Kamioka long-baseline neutrino experiment (K2K). It monitors the
neutrino beam properties at the near site by measuring the energy, angle and
production point of muons produced by charged-current neutrino interaction. The
detector has been working stably since the start of the K2K experiment.


title:
Observation of Pseudoscalar and Axial Vector Resonances in pi- p -> K+
  K- pi0 n at 18 GeV

abstract:
  A new measurement of the reaction pi- p -> K+ K- pi0 n has been made at a
beam energy of 18 GeV. A partial wave analysis of the K+ K- pi0 system shows
evidence for three pseudoscalar resonances, eta(1295), eta(1416), and
eta(1485), as well as two axial vectors, f1(1285), and f1(1420). Their observed
masses, widths and decay properties are reported. No signal was observed for
C(1480), an IG J{PC} = 1+ 1{--} state previously reported in phi pi0 decay.


title:
Observation of exclusive DVCS in polarized electron beam asymmetry
  measurements

abstract:
  We report the first results of the beam spin asymmetry measured in the
reaction e + p -> e + p + gamma at a beam energy of 4.25 GeV. A large asymmetry
with a sin(phi) modulation is observed, as predicted for the interference term
of Deeply Virtual Compton Scattering and the Bethe-Heitler process. The
amplitude of this modulation is alpha = 0.202 +/- 0.028. In leading-order and
leading-twist pQCD, the alpha is directly proportional to the imaginary part of
the DVCS amplitude.


title: Linear Collider Physics

abstract:
  We report on a study of the physics potential of linear $e^+e^-$ colliders.
Although a linear collider (LC) would support a broad physics program, we focus
on the contributions that could help elucidate the origin of electroweak
symmetry breaking. Many extensions of the standard model have a decoupling
limit, with a Higgs boson similar to the standard one and other, higher-mass
states. Mindful of such possibilities, we survey the physics of a (nearly)
standard Higgs boson, as a function of its mass. We also review how
measurements from an LC could help verify several well-motivated extensions of
the standard model. For supersymmetry, we compare the strengths of an LC with
the LHC. Also, assuming the lightest superpartner explains the missing dark
matter in the universe, we examine other places to search for a signal of
supersymmetry. We compare the signatures of several scenarios with extra
spatial dimensions. We also explore the possibility that the Higgs is a
composite, concentrating on models that (unlike technicolor) have a Higgs boson
with mass of a few hundred GeV or less. Where appropriate, we mention the
importance of high luminosity, for example to measure branching ratios of the
Higgs, and the importance of multi-TeV energies, for example to explore the
full spectrum of superpartners.


title: Recent Results from KTeV

abstract:
  Recent results are presented for (1) the charge asymmetry in semielectronic
kaon decay; (2) the charge radius of the neutral kaon; (3) the decay Klong ->
pi0 pi0 e+e-; (4) constraints on rho(CKM) from kaon decays; (5) lepton flavor
violation. A few words about future kaon physics work at Fermilab are included.


title: Angular Analysis of the Muon Pair Asymmetry at LEP 1

abstract:
  Data on muon pair production obtained by the OPAL collaboration at centre of
mass energies near the Z peak are analysed. Small angular mismatches between
the directions of the two muons are used to assess the effects of initial state
photon radiation and initial-final-state radiation interference on the
forward-backward asymmetry of muon pairs. The dependence of the asymmetry on
the invariant mass of the pair is measured in a model-independent way.
Effective vector and axial-vector couplings of the Z boson are determined and
compared to the Standard Model expectations.


title:
Measurement of Z/gamma* production in Compton scattering of quasi-real
  photons

abstract:
  The process e+ e- -> e+ e- Z/gamma* is studied with the OPAL detector at LEP
at a centre of mass energy of sqrt(s) = 189 GeV. The cross-section times the
branching ratio of the Z/gamma* decaying into hadrons is measured within
Lorentz invariant kinematic limits to be (1.2 +/- 0.3 +/- 0.1) pb for invariant
masses of the hadronic system between 5 GeV and 60 GeV and (0.7 +/- 0.2 +/-
0.1) pb for hadronic masses above 60 GeV. The differential cross-sections of
the Mandelstam variables s-hat, t-hat, and u-hat are measured and compared with
the predictions from the Monte Carlo generators grc4f and PYTHIA. From this,
based on a factorisation ansatz, the total and differential cross-sections for
the subprocess e gamma -> e Z/gamma* are derived.


title: Observation of Color-Suppressed $\overline{B}^0 \to D^{(*)0}X^0$ Decays

abstract:
  We report the first observation of color-suppressed $\overline{B}^0\to D^0
\pi^0$ and $D^{(*)0} \omega$ decays and evidence of $\overline{B}^0 \to D^{*0}
\pi^0$ and $D^{(*)0} \eta$. The branching fractions are found to be ${\cal B}
(\overline{B}^0\to D^0 \pi^0) = (2.9 ^{+0.4}_{-0.3} \pm 0.6) \times 10^{-4}$,
${\cal B} (\overline{B}^0 \to D^0 \omega) = (1.7 ^{+0.5 +0.3}_{-0.4 -0.4})
\times 10^{-4}$, and ${\cal B} (\overline{B}^0 \to D^{*0} \omega) = (3.4
^{+1.3}_{-1.1}\pm 0.8) \times 10^{-4}$. The analysis is based on a data sample
of 21.3 fb$^{-1}$ collected at the $\Upsilon(4S)$ resonance by the Belle
detector at the KEKB $e^{+} e^{-}$ collider.


title: Measurement of the B-->J/psi K^*(892) decay amplitudes

abstract:
  We present a measurement of the decay amplitudes in B-->J/psi K^*(892)
channels using 20.7 fb-1 of data collected at the Upsilon(4S) resonance with
the BABAR detector at PEP-II. We measure a P-wave fraction R_perp =
(16.0+/-3.2+/-1.4)% and a longitudinal polarization fraction
(59.7+/-2.8+/-2.4)%. The measurement of a relative phase that is neither 0 nor
pi, phi_ll = 2.50+/-0.20+/-0.08 radians, favors a departure from the
factorization hypothesis. Although the decay B-->J/psi Kpi proceeds mainly via
K^*(892), there is also evidence for K^*_2(1430) and Kpi S-wave contributions.


title: Observation of $B^+ \to \chi_{c0} K^+ $

abstract:
  We report the first observation of the decay $B^+ \to \chi_{c0} K^+$ using
21.3 fb$^{-1}$ of data collected by the Belle detector at the $\Upsilon$(4S)
resonance. The preliminary result for the branching fraction is
${\cal{B}}(B^+\to \chi_{c0}K^+)=(8.0^{+2.7}_{-2.4}\pm 1.0\pm 1.1)\times
10^{-4}$ where the first error is statistical, the second is systematic, and
the third comes from the uncertainty in the $\chi_{c0}\to\pi^+\pi^-$ branching
fraction.


title: Study of three-body charmless B decays at Belle

abstract:
  Using a data sample of 21.3 fb$^{-1}$ collected by the Belle detector, three
body charmless decays $B^+\to K^+ h^+ h^-$ have been studied. With no
assumptions on the intermediate mechanisms, the following branching fractions
have been measured for the first time $ {\cal{B}}(B^+\to K^+ \pi^- \pi^+) =
(58.5\pm 7.1\pm 8.8)\times 10^{-6}$ and $ {\cal{B}}(B^+\to K^+ K^- K^+) =
(37.0\pm 3.9\pm 4.4)\times 10^{-6}$. We also present the first observations of
the decay mode $B^+\to K^{*0}(892)\pi^+$ with a branching fraction of
${\cal{B}}(B^+\to K^{*0}(892) \pi^+) =
(16.7^{+3.7+2.1+3.0}_{-3.4-2.1-5.9})\times 10^{-6}$ and the decay mode $B^+\to
f_0(980)K^+$ with a product branching fraction of ${\cal{B}}(B^+\to f_0(980)
K^+)\times{\cal{B}}(f_0(980)\to \pi^+\pi^-) =
(11.7^{+2.5+1.5+4.1}_{-2.7-1.5-1.0})\times 10^{-6}$.


title:
Properties of hadronic final states in diffractive deep inelastic ep
  scattering at HERA

abstract:
  Characteristics of the hadronic final state of diffractive deep inelastic
scattering events, ep -> eXp, were studied in the kinematic range 4 < M_X < 35
GeV, 4 < Q^2 < 150 GeV^2, 70 < W < 250 GeV and 0.0003 < x_pom < 0.03 with the
ZEUS detector at HERA using an integrated luminosity of 13.8 pb^{-1}. The
events were tagged by identifying the diffractively scattered proton using the
leading proton spectrometer. The properties of the hadronic final state, X,
were studied in its center-of-mass frame using thrust, thrust angle,
sphericity, energy flow, transverse energy flow and ``seagull'' distributions.
As the invariant mass of the system increases, the final state becomes more
collimated, more aligned and more asymmetric in the average transverse momentum
with respect to the direction of the virtual photon. Comparisons of the
properties of the hadronic final state with predictions from various Monte
Carlo model generators suggest that the final state is dominated by qqg states
at the parton level.


title: Standard Model Physics at HERA

abstract:
  Both components of the Standard Model, QCD and the electroweak sector, are
tested in the H1 and ZEUS experiments at HERA. The inclusive ep single and
double differential cross sections for neutral and charged current processes
are measured in the range of four-momentum transfer squared, Q2, between 0.045
and 30000 GeV2, and Bjorken x between 10^{-6} and 0.65. The neutral current
double differential cross section, from which the proton structure function F2
and the longitudinal structure function FL are extracted, is measured at low x
with typically 1% statistical and 2-3% systematic uncertainties. In a next-to-
leading order (NLO) DGLAP QCD analysis using the H1 measurements and the mu p
data of the BCDMS collaboration the strong coupling constant alpha_s and the
gluon momentum distribution are simultaneously determined. A value of alpha_s
(MZ)=0.1150+-0.0017(exp){+0.0009}{-0.0005}(model) is obtained, with an
additional theoretical uncertainty of about +-0.005, mainly due to the
uncertainty of the renormalisation scale. F2c, the charm contribution to F2, is
measured and well described by the boson gluon fusion production mechanism
using the gluon distribution from the NLO QCD analysis. The gluon distribution
and the strong coupling constant alpha_s are also determined from jet
production. For Q2>1000 GeV2, an asymmetry between e+p and e-p neutral current
scattering is observed and the structure function xF3 is extracted. A fit to
the charged current data is used to determine a value for the W boson
propagator mass. All data are found to be in good agreement with Standard Model
predictions.


title: Standard Model Higgs Boson with the L3 Experiment at LEP

abstract:
  Final results of the search for the Standard Model Higgs boson are presented
for the data collected by the L3 detector at LEP at centre-of-mass energies up
to about 209 GeV. These data are compared with the expectations of Standard
Model processes for Higgs boson masses up to 120 GeV. A lower limit on the mass
of the Standard Model Higgs boson of 112.0 GeV is set at the 95 % confidence
level. The most significant high mass candidate is a Hnunu event. It has a
reconstructed Higgs mass of 115 GeV and it was recorded at root(s)=206.4 GeV.


title:
Measurement of the Topological Branching Fractions of the tau lepton at
  LEP

abstract:
  Using data collected with the L3 detector at LEP from 1992 to 1995 on the Z
peak, we determine the branching fractions of the tau lepton into one, three
and five charged particles to be:
  B(tau->(1-prong)) = 85.274 +- 0.105 +- 0.073 %,
  B(tau->(3-prong)) = 14.556 +- 0.105 +- 0.076 %,
  B(tau->(5-prong)) = 0.170 +- 0.022 +- 0.026 %.
  The first uncertainties are statistical and the second systematic. The
accuracy of these measurements alone is similar to that of the current world
average.


title:
Investigation of B --> D^{(*)}anti-D^{(*)}K decays with the BABAR
  detector

abstract:
  Using about 23M $B \bar B$ events collected in 1999-2000 with the BABAR
detector, we report the observation of several hundred $B \to D^{(*)}\bar
D^{(*)}K$ decays with two completely reconstructed D mesons. The preliminary
branching fractions of the low background decay modes $B^0\to
D^{*-}D^{(*)0}K^+$ are determined to be ${\cal B}(B^0 \to D^{*-}D^{0}K^+) =
(2.8 \pm 0.7 \pm 0.5)\times 10^{-3}$ and ${\cal B}(B^0 \to D^{*-}D^{*0}K^+) =
(6.8 \pm 1.7 \pm 1.7)\times 10^{-3}$. Observation of a significant number of
candidates in the color-suppressed decay mode $B^+\to D^{*+}D^{*-}K^+$ is
reported with a preliminary branching fraction ${\cal B}(B^+\to
D^{*+}D^{*-}K^+)= (3.4\pm 1.6\pm 0.9)\times 10^{-3}.$


title: Measurement of the branching fraction for the decay B^0 --> D^{*+}D^{*-}

abstract:
  Decays of the type B --> D^{(*)} anti-D^{(*)} can be used to provide a
measurement of the parameter sin2beta of the Unitarity Triangle that is
complementary to the measurement derived from the mode B^0 --> J/psi K_s^0. In
this document we report a measurement of the branching fraction for the decay
B^0 --> D^{*+}D^{*-} with the BABAR detector. With data corresponding to an
integrated luminosity of 20.7 fb^{-1} collected at the Upsilon(4S) resonance
during 1999-2000, we have reconstructed 38 candidate signal events in the mode
B^0 --> D^{*+}D^{*-} with an estimated background of 6.2+/-0.5 events. From
these events, we determine the branching fraction to be BF(B^0 -->
D^{*+}D^{*-}) = (8.0+/-1.6(stat)+/-1.2(syst))x10^{-4} (preliminary).


title: Measurements of B^0 decays to pi^+pi^-pi^0

abstract:
  We present preliminary results of searches for exclusive $B^0$ decays to
$\pi^+\pi^-\pi^0$ among 22.7 million $b\bar{b}$ pairs collected by the BABAR
experiment from electron-positron collisions near the $\Upsilon(4S)$ resonance.
We measure $\cal{B}(\rho^\mp \pi^\pm) = (28.9\pm 5.4\pm 4.3)\times 10^{-6}$,
and find no evidence for the presence of any other decay mode in the
$\pi^+\pi^-\pi^0$ Dalitz plot. Upper limits are determined for the branching
fractions of $B^0\to\rho^0\pi^0$, non-resonant $B^0$ decays to
$\pi^+\pi^-\pi^0$ and of several discrete regions of $\pi^+\pi^-\pi^0$
phase-space. We also measure the direct CP-violating asymmetry between the
rates of untagged $\rho^+\pi^-$ and $\rho^-\pi^+$, finding no significant
evidence for an effect.


title:
Study of T and CP violation in B^0-anti-B^0 mixing with inclusive
  dilepton events

abstract:
  We report a study of T and CP violation in $B^0$-$\bar B^0$ mixing using an
inclusive dilepton sample collected by the BABAR experiment at the PEP-II $B$
Factory. The asymmetry between $\ell^+\ell^+$ and $\ell^-\ell^-$ allows us to
compare the probabilities for $\bar B^0 \to B^0$ and $B^0 \to \bar B^0$
oscillations and thus probe T and CP invariance.
  A sample of 20,381 same-sign dilepton events is selected in the 1999--2000
data sample, corresponding to an integrated luminosity of 20.7 fb$^{-1}$ on the
$\Upsilon(4S)$ resonance. We measure a same-sign dilepton asymmetry of
$A_T=(0.5\pm 1.2\pm 1.4)%$; for the parameter $\epsilon_b$ representing T and
CP violations in mixing, we obtain a preliminary result of $$ \frac{{\mathrm
Re}(\epsilon_b)}{1+|\epsilon_b|^2} = (1.2\pm 2.9\pm 3.6) \times 10^{-3}. $$


title:
Measurement of D_s^+ and D_s^{*+} production in B meson decays and from
  continuum e^+e^- annihilations at sqrt{s}=10.6 GeV

abstract:
  New precise measurements of $D_s^+$ and $D_s^{*+}$ meson production from $B$
mesons and $q\bar q$ continuum events near the $\Upsilon(4S)$ resonance are
presented in this paper. Using the BABAR data recorded in 1999 and 2000 of 20.8
fb$^{-1}$ on-resonance and 2.6 fb$^{-1}$ off-resonance, we measure the
inclusive branching fractions ${\cal B}(B\to D_s^+ X) = (10.93\pm 0.19\pm
0.58\pm 2.73)%$ and ${\cal B}(B\to D_s^{*+} X) = (7.94\pm 0.82\pm 0.72\pm
1.99)%$, where the first error is statistical, the second is the systematic
error, and the third is the error due to the $D_s^+\to\phi\pi^+$ branching
fraction uncertainty. The branching fractions $\Sigma {\cal B}(B\to D_s^{(*)+}
\bar D^{(*)}) = (5.07\pm 0.09\pm 0.34\pm 1.27)%$ and $\Sigma {\cal B}(B\to
D_s^{*+} \bar D^{(*)}) = (4.07\pm 0.42\pm 0.53\pm 1.02)%$ have been determined
from the measured $D_s^{(*)+}$ momentum spectra.


title: Observation of Large CP Violation in the Neutral B Meson System

abstract:
  We present a measurement of the Standard Model CP violation parameter sin
2phi_1 based on a 29.1 fb^{-1} data sample collected at the Upsilon(4S)
resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.
One neutral B meson is fully reconstructed as a J/psi Ks, psi(2S) Ks, chi_c1
Ks, eta_c Ks, J/psi K_L or J/psi K^{*0} decay and the flavor of the
accompanying B meson is identified from its decay products. From the asymmetry
in the distribution of the time intervals between the two B meson decay points,
we determine sin 2phi_1 = 0.99 +- 0.14(stat) +- 0.06(syst). We conclude that we
have observed CP violation in the neutral B meson system.


title:
Design and Performance of the Level 1 Calorimeter Trigger for the BABAR
  Detector

abstract:
  Since May 1999 the BABAR detector has been taking data at the PEP-II
asymmetric electron-positron collider at the Stanford Linear Accelerator
Center, California. This experiment requires a very large data sample and the
PEP-II accelerator uses intense beams to deliver the high collision rates
needed. This poses a severe challenge to the BaBar trigger system, which must
reject the large rate of background signals resulting from the high beam
currents whilst accepting the collisions of interest with very high efficiency.
One of the systems that performs this task is the Level 1 Calorimeter Trigger,
which identifies energy deposits left by particles in the BABAR calorimeter. It
is a digital, custom, fixed latency system which makes heavy use of high-speed
FPGA devices to allow flexibility in the choice of data filtering algorithms.
Results from several intermediate processing stages are read out, allowing the
selection algorithm to be fully analysed and optimized offline. In addition,
the trigger is monitored in real time by sampling these data and cross-checking
each stage of the trigger calculation against a software model. The design,
implementation, construction and performance of the Level 1 Calorimeter Trigger
during the first year of BABAR operation are presented.


title: Prompt Photons in Photoproduction at HERA

abstract:
  The production of prompt photons in photoproduction reactions in the ZEUS
experiment is discussed. Cross sections for inclusive prompt photons and for
prompt photons accompanied by jets are compared with theory, and the latter are
used to determine the effective transverse momentum of the quarks in the
proton.


title:
Compact Frontend-Electronics and Bidirectional 3.3 Gbps Optical Datalink
  for Fast Proportional Chamber Readout

abstract:
  The 9600 channels of the multi-wire proportional chamber of the H1 experiment
at HERA have to be read out within 96 ns and made available to the trigger
system. The tight spatial conditions at the rear end flange require a compact
bidirectional readout electronics with minimal power consumption and dead
material.
  A solution using 40 identical optical link modules, each transferring the
trigger information with a physical rate of 4 x 832 Mbps via optical fibers,
has been developed and commisioned. The analog pulses from the chamber can be
monitored and the synchronization to the global HERA clock signal is ensured.


title: Observation of Radiative B Meson Decays into Higher Kaonic Resonances

abstract:
  We have studied radiative B meson decays into higher kaonic resonances
decaying into a two-body or three-body final state, using a data sample of 21.3
fb$^{-1}$ recorded at the $\Upsilon(4S)$ resonance with the Belle detector at
KEKB. For the two-body final state, we extract the $B \to K_2^{*}(1430)^0
\gamma$ component from an analysis of the helicity angle distribution, and
obtain ${\cal B}(B^0 \to K_2^{*}(1430)^0 \gamma) = (1.26\pm 0.66\pm 0.10)\times
10^{-5}$. For the three-body final state, we observe a $B \to K\pi\pi\gamma$
signal that is consistent with a mixture of $B \to K^* \pi \gamma$ and $B \to K
\rho \gamma$. This is the first time that $B \to K^* \pi \gamma$ and $B \to K
\rho \gamma$ have been observed separately. We find their branching fractions
to be ${\cal B}(B \to K^* \pi \gamma; M_{K^*\pi}<2.0 GeV/c^2) = (5.6\pm 1.1\pm
0.9)\times 10^{-5}$ and ${\cal B}(B \to K \rho \gamma; M_{K\rho} < 2.0 GeV/c^2)
= (6.5\pm 1.7^{+1.1}_{1.2})\times 10^{-5}$, respectively.


title: Zeus at HERA II

abstract:
  The ZEUS detector has been upgraded in a number of areas to prepare for the
physics opportunities of HERA II. These upgrades, and their physics rationale
and promise, are briefly outlined. The measurement of polarisation at HERA II,
and its importance for the HERA II physics programme, is also discussed.


title:
Single Intermediate Vector Boson Production in e+e- collisions at
  sqrt(s) = 183 and 189 GeV

abstract:
  The cross-sections for the production of single charged and neutral
intermediate vector bosons were measured using integrated luminosities of 52
pb^{-1} and 154 pb^{-1} collected by the DELPHI experiment at centre-of-mass
energies of 182.6 GeV and 188.6 GeV, respectively. The cross-sections for the
reactions were determined in limited kinematic regions. The results found are
in agreement with the Standard Model predictions for these channels.


title: Search for the decay B^0 --> gamma-gamma

abstract:
  We present a limit on the branching fraction for the decay $B^0 \to \gamma
\gamma$ using data collected at the $\Upsilon(4S)$ resonance with the BABAR
detector at the PEP-II asymmetric--energy $e^+e^-$ collider. Based on the
observation of one event in the signal region, out of a sample of $21.3 \times
10^6$ $e^+e^- \to \Upsilon(4S) \to B\bar B$ decays, we establish an upper limit
on the branching fraction of ${\cal B}(B^0 \to \gamma \gamma) < 1.7 \times
10^{-6}$ at the 90% confidence level. This result substantially improves upon
existing limits.


title: Diffraction in CDF: Run I results and plans for Run II

abstract:
  Results on diffraction obtained by the CDF Collaboration in Run I of the
Fermilab Tevatron $\bar pp$ collider are reviewed. New results are reported on
soft double diffraction and diffractive $J/\psi$ production. The CDF program
for diffractive studies in Run II is briefly discussed.


title: Double Diffraction Dissociation at the Fermilab Tevatron Collider

abstract:
  We present results from a measurement of double diffraction dissociation in
$\bar pp$ collisions at the Fermilab Tevatron collider. The production cross
section for events with a central pseudorapidity gap of width $\Delta\eta^0>3$
(overlapping $\eta=0$) is found to be $4.43\pm 0.02{(stat)}{\pm 1.18}{(syst)
mb}$ [$3.42\pm 0.01{(stat)}{\pm 1.09}{(syst) mb}$] at $\sqrt{s}=1800$ [630]
GeV. Our results are compared with previous measurements and with predictions
based on Regge theory and factorization.


title: Observation of Diffractive $J/\psi$ Production at the Fermilab Tevatron

abstract:
  We report the first observation of diffractive $J/\psi(\to \mu^+\mu^-)$
production in $\bar pp$ collisions at $\sqrt{s}$=1.8 TeV. Diffractive events
are identified by their rapidity gap signature. In a sample of events with two
muons of transverse momentum $p_T^{\mu}>2$ GeV/$c$ within the pseudorapidity
region $|\eta|<$1.0, the ratio of diffractive to total $J/\psi$ production
rates is found to be $R_{J/\psi}= [1.45\pm 0.25]%$. The ratio $R_{J/\psi}(x)$
is presented as a function of $x$-Bjorken. By combining it with our previously
measured corresponding ratio $R_{jj}(x)$ for diffractive dijet production, we
extract a value of $0.59\pm 0.15$ for the gluon fraction of the diffractive
structure function of the proton.


title:
Evidence for the Electroweak Penguin Decay $B \to
  X_{s}\ell^{+}\ell^{-}$}

abstract:
  We report a search for the flavor-changing neutral current decay $B \to X_{s}
\ell^{+} \ell^{-}$ using a 29.5 fb$^{-1}$ data sample accumulated at the
$\Upsilon(4S)$ resonance with the Belle detector at the KEKB $e^{+}e^{-}$
storage ring. We observe evidence for $B\to K\mu^+\mu^-$ and report the
preliminary branching fraction of ${\cal B}(B \to K \mu^{+} \mu^{-}) =
  (0.99^{+0.39}_{-0.32}^{+0.13}_{-0.15}) \times 10^{-6}$. We also set the
following 90% confidence level upper limits on the branching fractions for
exclusive and inclusive decays, ${\cal B}(B \to K e^{+} e^{-}) < 1.2 \times
10^{-6}$, ${\cal B}(B \to K^*(892) e^{+} e^{-}) < 5.1 \times 10^{-6}$, ${\cal
B}(B \to K^*(892) \mu^{+} \mu^{-}) < 3.0 \times 10^{-6}$, ${\cal B}(B \to X_{s}
e^{+} e^{-}) < 10.1 \times 10^{-6}$, ${\cal B}(B \to X_{s} \mu^{+} \mu^{-}) <
19.1 \times 10^{-6}$.


title: Results from the short baseline experiments at CERN

abstract:
  Considerations based on particle physics (in particular the so-called see-saw
mechanism) and on cosmology, in relation to the Dark Matter question, motivated
the search for numu nutau oscillation in the region of small mixing angles. We
present here the outcome of the short-baseline programme carried out at CERN by
the CHORUS and NOMAD experiments. Both experiments are about to publish their
final results. At values of squared mass difference greater than 1 eV2
oscillations between numu and nutau are excluded at 90% C.L. down to mixing
angles values of O(10^{-4}).


title: Study of CP-violating asymmetries in B-->pi^+/-pi^-/+, K^+/-pi^-+ decays

abstract:
  We present a preliminary measurement of the time-dependent CP-violating
asymmetry parameters S_pipi and C_pipi in neutral B decays to the pi^+/-pi^-/+
CP eigenstate, and an updated preliminary measurement of the charge asymmetry
A_Kpi in B --> K^+/-pi^-/+ decays. Event yields and $\CP$-violation parameters
are determined simultaneously from a multidimensional unbinned maximum
likelihood fit. In a data sample consisting of approximately 33 million
Upsilon(4S)--)B-anti-B decays collected with the BABAR detector at the SLAC
PEP-II asymmetric B Factory, we find 65^{+12}_{-11} pi^+/-pi^-/+ and 217+/-18
K^+/-pi^-/+ candidates and measure S_pipi = 0.03^{+0.53}_{-0.56}+/-0.11, C_pipi
= -0.25^{+0.45}_{-0.47}+/-0.14, and A_Kpi = -0.07+/-0.08+/-0.02, where the
first error is statistical and the second is systematic.


title: Search for B^0 --> a_0^+(980)pi^-

abstract:
  We present preliminary results of a search for the decay B^0 -->
a_0^+(980)pi^- among 22.7 million Upsilon(4S)-->B-anti-B pairs collected by the
BABAR detector at PEP-II. Using improved background suppression techniques and
optimal signal extraction for rare decay searches, an excess of events over
expected background is observed at the level of 3.7 standard deviations. This
corresponds to the branching fraction BR(B^0 --> a_0^+ (a_0^+ --> eta pi^+)
pi^-) =(6.2_{-2.5}^{+3.0}+/-1.1) x 10^{-6}, where the first error is
statistical and the second is systematic. The 90% confidence level upper limit
is 11.5 x 10^{-6}.


title: A Study of the Lorentz Structure in Tau Decays

abstract:
  This paper describes a measurement of the Michel parameters, \eta, \rho, \xi,
\xi\delta, and the average \nu_{\tau} helicity, h_{\nu_{\tau}}, in tau lepton
decays together with the first measurement of the tensor coupling in the weak
charged current. The tau+tau- pairs were produced at the LEP e+e- collider at
CERN from 1992 through 1995 in the DELPHI detector. Assuming lepton
universality in the decays of the tau the measured values of the parameters
were:
  \eta = -0.005 +/- 0.036 +/- 0.037,
  \rho = 0.775 +/- 0.023 +/- 0.020,
  \xi = 0.929 +/- 0.070 +/- 0.030,
  \xi\delta = 0.779 +/- 0.070 +/- 0.028, h_{\nu_{\tau}} = -0.997 +/- 0.027 +/-
0.011. The strength of the tensor coupling was measured to be \kappa^W_\tau =
-0.029 +/- 0.036 +/- 0.018. The first error is statistical and the second error
is systematic in all cases. The results are consistent with the V-A structure
of the weak charged current in decays of the tau lepton.


title:
Measurement of the B/s0 Lifetime and Study of B/s0 anti-B/s0
  Oscillations using D/s l Events

abstract:
  Lifetime and oscillations of B0s mesons have been studied in events with a
large transverse momentum lepton and a Ds of opposite electric charge in the
same hemisphere, selected from about 3.6 million hadronic Z0 decays accumulated
by DELPHI between 1992 and 1995.
  The B0s lifetime and the fractional width difference between the two physical
B0s states have been found to be:
  \tau_(B0s) = (1.42^{+0.14}_{-0.13}(stat.) +/- 0.03(syst.)) ps
  \Delta\Gamma(B0s)/\Gamma(B0s) < 0.46 at the 95% C.L.
  In the latter result it has been assumed that \tau_(B0s)=\tau_(B0d).
  Using the same sample, a limit on the mass difference between the physical
B0s states has been set:
  Delta(m_B0s) > 7.4 ps^{-1} at the 95% C.L. with a corresponding sensitivity
equal to 8.1 ps^{-1}.


title: Measurement of $D^0$ decays to $K^0_L \pi^0$ and $K^0_S \pi^0$ at Belle

abstract:
  We present a preliminary measurement of the ratio of $D^0$ decay rates into
$K^0_L \pi^0$ and $K^0_S \pi^0$ final states. This ratio can be used to
disentangle the Cabibbo favored $D^0 \to \bar{K}^0\pi^0$ and doubly Cabibbo
suppressed $D^0 \to K^0 \pi^0$ amplitudes, and contributes to the important
goal of constraining the strong phase $\delta_{K \pi}$ between $D^0 \to K^-
\pi^+$ and $D^0 \to K^+ \pi^-$. The measurement is based on a large data set
accumulated by the Belle detector at the KEKB $e^+ e^-$ collider, with $K^0_L$
candidates reconstructed using hadronic clusters in the KLM ($K_L$ and $\mu$
identification system), together with a $D^0$ mass constraint and $D^{*+}$ tag.


title: The Proposed CLEO-c Program and R Measurement Prospects

abstract:
  The proposed experimental program (CLEO-c) for a charm factory based on a
modification of the Cornell Electron Storage Ring is summarized. The prospects
for R measurements over the range 3 GeV to 7 GeV are examined in detail.
Adapted from "CLEO-c and CESR-c: A New Frontier of Weak and Strong
Interactions", the CLEO-c project description, by the CLEO Collaboration.


title:
Aging tests of the proportional wire chambers using Ar/CF4/CH4
  (74:20:6), Ar/CF4/CH4 (67:30:3), Ar/CF4/CO2 (65:30:5) mixtures for the HERA-B
  Muon Detector

abstract:
  The Muon Detector of the HERA-B experiment at DESY is a gaseous detector that
provides muon identification in a high-rate hadronic environment. We present
our studies on the properties of several fast gases, Ar/CF4/CH4 (74:20:6),
Ar/CF4/CH4 (67:30:3) and Ar/CF4/CO2 (65:30:5), which have been found to fulfill
muon detection requirements. The severe radiation environment of the HERA-B
experiment leads to the maximum charge deposit on a wire, within the muon
detector, of 200 mC/cm per year. For operation in such an environment, the main
criteria for the choice of gas turned out to be stability against aging. An
overview of aging results from laboratory setups and experimental detectors for
binary and ternary mixtures of Ar, CH4, CF4 and CO2 is presented and the
relevance of the various aging results is discussed. Since it is not clear how
to extrapolate aging results from small to large areas of irradiation, the
lifetime of aluminum proportional chambers was studied under various
conditions. In this paper we provide evidence that aging results depend not
only upon the total collected charge. It was found that the aging rate for
irradiation with $Fe^{55}$ X-rays and 100 MeV $\alpha$-particles may differ by
more than two orders of magnitude.


title:
STAR Barrel Electromagnetic Calorimeter Absolute Calibration Using
  "Minimum Ionizing Particles" from Collisions at RHIC

abstract:
  The procedure for the STAR Barrel Electromagnetic Calorimeter (BEMC) absolute
calibrations, using penetrating charged particle hits (MIP-hits) from physics
events at RHIC, is presented. Its systematic and statistical errors are
evaluated. It is shown that, using this technique, the equalization and
transfer of the absolute scale from the test beam can be done to a percent
level accuracy in a reasonable amount of time for the entire STAR BEMC.
MIP-hits would also be an effective tool for continuously monitoring the
variations of the BEMC tower's gains, virtually without interference to STAR's
main physics program. The method does not rely on simulations for anything
other than geometric and some other small corrections, and also for estimations
of the systematic errors. It directly transfers measured test beam responses to
operations at RHIC.


title:
Preliminary Measurement of the Differential Cross Section from
  Neutrino-Nucleon Deeply Inelastic Scattering at Nutev

abstract:
  Preliminary results for the neutrino-nucleon differential cross section from
the NuTeV experiment are presented. The extraction of the differential cross
section from NuTeV is discussed and the structure functions $F_2$ and $\Delta
xF_3$ are presented. Comparisons are made with CCFR results.


title: MSSM SUGRA searches at LEP

abstract:
  During the LEP2 operation, the 4 LEP experiments have collected data at
centre-of-mass energies up to 209 GeV. Those data have been analysed in the
search of charginos, neutralinos and sfermions in the framework of the Minimal
Supersymmetric Standard Model (MSSM) with R-parity conservation and assuming
the lightest neutralino to be the Lightest Supersymmetric Particle
(SUGRA-model). No evidence for a signal was found in any of the channels. The
results of each search were used to derive upper limits on production
cross-sections and masses. In addition, the combined result of all searches
excludes regions in the parameter space of the constrained MSSM, leading to
limits on the mass of the LSP. All limits are given at 95% confidence level,
all results are preliminary.


title: MSSM SUSY Searches at LEP2

abstract:
  In the final run in the year 2000 the four experiments at the electron
positron collider LEP have accumulated data corresponding to an integrated
luminosity of more than 210 pb-1 per experiment at centre-of-mass energies up
to 208 GeV. These data have been used to extend the search for supersymmetric
particles in the new energy domain. In the present paper the results of
searches for sfermions, charginos and neutralinos are described, assuming the
minimal supersymmetric standard model with R-parity conservation. In addition,
the determination of a lower mass limit of the lightest neutralino is
discussed.


title:
Observation of an excess in the ALEPH search for the Standard Model
  Higgs boson

abstract:
  The ALEPH search for the Standard Model Higgs boson in the year 2000 revealed
an excess of signal-like events, consistent with a signal hypothesis mh=115
GeV/c2. Here we present the first results after the analysis of all of the data
collected during the year 2000, at collision energies up to 209 GeV, and which
were published in November 2000.


title: The Standard Model Higgs boson search at LEP: combined results

abstract:
  During the run in the year 2000, with data collected at collision energies up
to 209 GeV, the LEP experiments have possibly unearthed the first evidence of a
Higgs boson signal at mh=115 GeV/c2. The preliminary combined results prepared
immediately after the end of the data-taking, in November 2000, are presented
here. Overall, a 2.9 sigma excess over the background is found, consistent with
a Standard Model Higgs boson signal with mh=115.0 GeV/c2.


title:
Observation of $\Lambda_c^+ \to \Lambda^0 K^+$, $\Lambda_c^+ \to
  \Sigma^0 K^+$ and $\Lambda_c^+ \to \Sigma^+ K^+\pi^-$ decays

abstract:
  We present measurements of the Cabibbo-suppressed decays $\Lambda_c^+ \to
\Lambda^0 K^+$ and $\Lambda_c^+ \to \Sigma^0 K^+$ (both first observations),
$\Lambda_c^+ \to \Sigma^+ K^+\pi^-$ (seen with large statistics for the first
time), $\Lambda_c^+ \to p K^+ K^-$ and $\Lambda_c^+ \to p \phi$ (measured with
improved accuracy). Improved branching ratio measurements for the decays
$\Lambda_c^+ \to \Sigma^0 K^+ K^-$ and $\Lambda_c^+ \to \Sigma^0 \phi$, which
are attributed to W-exchange diagrams, are shown. We also present the first
evidence for $\Lambda_c^+ \to \Xi(1690) K^+$ and set an upper limit on
non-resonant $\Lambda_c^+ \to \Sigma^0 K^+ K^-$ decay. This analysis was
performed using 23.6 fb$^{-1}$ of data collected by the Belle detector at the
$e^+ e^-$ asymmetric collider KEKB.


title:
Search for New Heavy Particles in the WZ Final State in Proton
  Anti-Proton Collisions at Sqrt{s} = 1.8 TeV

abstract:
  We present a search for new heavy particles, $X$, which decay via $X
rightarrow WZ \to e\nu +jj$ in $p{\bar p}$ collisions at $\sqrt{s} = 1.8$ TeV.
No evidence is found for production of $X$ in 110 pb$^{-1}$ of data collected
by the Collider Detector at Fermilab. Limits are set at the 95% C.L. on the
mass and the production of new heavy charged vector bosons which decay via
$W'\to WZ$ in extended gauge models as a function of the width, $Gamma (W')$,
and mixing factor between the $W'$ and the Standard Model $W$ bosons.


title: Recent results from CLEO collaboration

abstract:
  Recent CLEO results on beauty and charm meson decays presented at the
International Conference on Flavor Physics (ICFP2001) are discussed. The
results include exclusive rare B decays (B to PP, PV, VV, \phiK^(*),
l^+l^-K^(*)), inclusive b to s \gamma, and CP violation measurements in beauty
and charm mesons. Preliminary results on rare B decays using CLEO III data are
also included.


title: Search for the rare decay K+ -> pi+ gamma

abstract:
  We have performed a search for the angular-momentum forbidden decay K+ -> pi+
gamma with the E787 detector at BNL. No events were observed in the pi+
kinematic region around 227 MeV/c. An upper limit on the branching ratio for
the decay is determined to be 3.6 x 10^{-7} at 90% confidence level.


title:
Inclusive semileptonic branching ratios of b hadrons produced in Z
  decays

abstract:
  A measurement of the inclusive semileptonic branching ratios of b hadrons
produced in Z decay is presented, using four million hadronic events collected
by the ALEPH detector from 1991 to 1995. Electrons and muons are selected
opposite to b-tagged hemispheres. Two different methods are explored to
distinguish the contributions from direct $\bl$ and cascade $\bcl$ decays to
the total lepton yield. One is based on the lepton transverse momentum
spectrum, the other makes use of the correlation between the charge of the
lepton and charge estimators built from tracks in the opposite hemisphere of
the event. The latter method reduces the dependence on the modelling of
semileptonic b decays. The results obtained by averaging the two techniques are
BR(b->l) = 0.1070 +- 0.0010 +- 0.0023 +- 0.0026 BR(b->c->l) = 0.0818 +- 0.0015
+- 0.0022 + 0.0022 -0.0014


title: Searches for Extra Dimensions at LEP

abstract:
  Extra spatial dimensions are proposed by recent theories that postulate the
fundamental gravitational scale to be of the same order as the electroweak
scale. Different final states and search strategies are used by LEP
collaborations to search for the signs of extra spatial dimensions.
  A brief review of the search strategies and results from all four LEP
experiments, ALEPH, DELPHI, L3 and OPAL, is given here. No hints for the
existence of extra dimensions are found and limits on the fundamental
gravitational scale are derived. The presented results are based on the data
collected at LEP in 1998-2000 at centre-of-mass energies from 189 GeV up to 208
GeV. All results reported here are still preliminary.


title:
A study of B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays:
  measurement of the ratio of branching fractions and search for direct
  CP-violating charge asymmetries

abstract:
  We have studied the B^+/- --> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays
using a 20.7 fb-1 data set collected with the BABAR detector. We observe a
signal of 51+/-10 B^+/- --> J/psi pi^+/- events and determine the ratio
BF(B^+/- --> J/psi pi^+/-)/BF(B^+/- --> J/psi K^+/-) to be [3.91 +/- 0.78
(stat.) +/- 0.19 (syst.)]%. The CP-violating charge asymmetries for the B^+/-
--> J/psi pi^+/- and B^+/- --> J/psi K^+/- decays are determined to be A_pi =
0.01 +/- 0.22 (stat.) +/- 0.01 (syst.) and A_K = 0.003 +/- 0.030 (stat.) +/-
0.004 (syst.).


title:
Measurement of the Branching Fraction for B->eta' K and Search for
  B->eta'pi+

abstract:
  We report measurements for two-body charmless B decays with an eta' meson in
the final state. Using 11.1X10^6 BBbar pairs collected with the Belle detector,
we find BF(B^+ ->eta'K^+)=(79^+12_-11 +-9)x10^-6 and BF(B^0 ->
eta'K^0)=(55^+19_-16 +-8)x10^-6, where the first and second errors are
statistical and systematic, respectively. No signal is observed in the mode B^+
-> eta' pi^+, and we set a 90% confidence level upper limit of BF(B^+->
eta'pi^+) < 7x10^-6. The CP asymmetry in B^+- -> eta'K^+- decays is
investigated and a limit at 90% confidence level of -0.20<Acp<0.32 is obtained.


title: Cerenkov Particle Identification in FOCUS

abstract:
  We describe the algorithm used to identify charged tracks in the fixed-target
charm-photoproduction experiment FOCUS.


title:
TESLA Technical Design Report, Part VI, Chapter 1: The Photon Collider
  at TESLA

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


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

abstract:
  We present the first measurement of the D*+ width using 9/fb of e+e- data
collected near the Upsilon(4S) resonance by the CLEO II.V detector. Our method
uses advanced tracking techniques and a reconstruction method that takes
advantage of the small vertical size of the CESR beam spot to measure the
energy release distribution from the D*+ -> D0 pi+ decay. We find the D*+ width
equals 96+/-4(Statistical)+/-22(Systematic) keV. We also measure the energy
release in the decay and compute m(D*+)-m(D0) =
145.412+/-0.002(Statistical)+/-0.012(Systematic) MeV/c**2.


title:
Performance of prototype BTeV silicon pixel detectors in a high energy
  pion beam

abstract:
  The silicon pixel vertex detector is a key element of the BTeV spectrometer.
Sensors bump-bonded to prototype front-end devices were tested in a high energy
pion beam at Fermilab. The spatial resolution and occupancies as a function of
the pion incident angle were measured for various sensor-readout combinations.
The data are compared with predictions from our Monte Carlo simulation and very
good agreement is found.


title: Search for Large Extra Dimensions at the Tevatron

abstract:
  We report a search for large extra spatial dimensions in $p\bar{p}$
collisions at a center of mass energy of 1.8 TeV at the Tevatron. We present
recent D0 results on graviton-mediated exchange processes, using events
containing a pair of electrons or photons. No evidence for signal is found,
allowing to place the most restrictive lower limits on the effective Planck
scale at the order of 1 TeV for several number of extra dimensions.


title: Searches for new physics at the Tevatron

abstract:
  Recent results of searches for new phenomena using data collected in Run I by
the CDF and D0 experiments are presented. D0 set limits for top squarks
decaying into b+l+sneutrino significantly beyond the reach of previous analyses
in this channel (m_stop>140GeV at 95% C.L. for m_snu=45GeV). CDF exclude top
squarks decaying into b+tau for masses below 111GeV. In addition, D0 have
analyzed photon and electron pair production to search for effects of large
extra dimensions. No evidence is found, resulting in limits on the effective
Planck scale of 1.1 TeV. Finally, D0 have used a model-independent search
strategy for new physics at high pt to test more than 32 different final states
for evidence of a signal. Observations in all samples are found to be
consistent with expectations from the Standard Model.