[en] The author presents high statistics results on D/sup +/ and D/sup 0/ decays from the MARK III detector at the e/sup +/e/sup -/ storage ring SPEAR. More than 85% of the D's decays is accounted for (assuming e-μ universality). Evidence for no color suppression in the D/sup +/ and D/sup 0/ decays is presented. The author also presents evidence for D/sup +/ final state interference. Non spectator decay modes are found to be of small contribution

[en] The absence of a detectable γ-ray emission from SN1987A following neutrino burst from this source has closed the window left by accelerator experiments and by previous astrophysical and cosmological observations for the existence of heavy neutrinos whose mass is less than 100 MeV and which are mixed with ν₃

[en] The neutrino observations of the supernova explosion SN1987A in the Large Magellanic Cloud by the KAMIOKANDE II and IMB detectors suggest new limits on the mass, lifetime, electric charge, magnetic moment and mixing of electron neutrinos. These new limits imply that neutrino decay, neutrino electric charge, neutrino magnetic moment, neutrino mixing and the MSW effect apparently cannot solve the solar neutrino problem

[en] We show that the observed fluxes, spectra and sky distributions of the diffuse backgrounds of high energy astronomical neutrinos, gamma rays and cosmic ray positrons observed near Earth satisfy the simple relations expected from their common production in hadronic collisions of high energy cosmic ray nuclei with diffuse matter in/near source.

[en] Long-duration gamma ray bursts (GRBs) and X-ray flashes (XRFs) appear to be produced by highly relativistic and narrowly coIIimated jets ejected in care collapse supernova (SN) explosions akin to SN1998bw. We review the history of the GRB-SN association idea and its observational verification. We summarize the present evidence far a GRB-XRF-SN association. We comment on the possibility that most, perhaps all, SN explosions produce GRBs, including SNe of Type Ia which may produce short GRBs-XRFs. We list the major open questions that follow from a GRB-XRF-SN association. Possible uses of the GRB-SN association in cosmology are pointed out

[en] Resistive cathode thin gap chambers (TGCs) have been used as particle detectors in high-energy physics experiments for more than a decade. A quantitative understanding of charge production mechanisms in TGCs has been developed and a simulation program produced to accurately describe the expected response from a chamber as a function of its design and operating parameters. This simulation is based upon a description of the processes of electron cluster production, drift and avalanche effects and space charge contributions from residual ions. Improved measurements of chamber performance are presented, and the parameters of the simulation have been fitted to these data yielding values consistent with estimates based on the physical mechanisms involved. Sensitivity of chamber timing and amplification properties to operating parameters is discussed

[en] Results are presented from a 120k picture exposure of the ANL 12 foot chamber to 6 GeV/c 60 percent transversely polarized protons. Included are final results on LAMBDA and d K⁰ inclusive production in which a K⁰ beam polarization asymmetry parameter of (-.65 +- .15) is obtained. Preliminary results on Δ⁺⁺ production in the reactions p up arrow p → Δ⁺⁺n and p up arrow p → Δ⁺⁺ + X will be presented. In addition, a comparison of the polarization of the low mass enhancements produced in the reactions p up arrow p → p(pπ⁺π^-), p(nπ⁺) and p(p⁰) is given

No abstract available

[en] We have studied inclusive K⁰/sub S/, Λ, and Lambda-bar production in π⁺d interactions at 24 GeV/c. The observed cross sections are 2.5 +- 0.13 mb for K⁰/sub S/, 1.62 +- 0.09 mb for Λ, and 0.12 +- 0.02 mb for Lambda-bar. Longitudinal- and transverse-momentum distributions of the produced particles are presented. The average charged multiplicities of the system associated with a K⁰/sub S/ or with a Λ are presented and discussed. A nonzero average Λ polarization (-0.10 +- 0.03) is observed. The x distribution of the backward (forward) K⁰/sub S/ and Λ produced in the reaction are in agreement with the x distribution of valence quarks in nucleons in nuclear target (pion beam), as predicted by the quark-recombination model of particle production applied to nuclear targets

[en] Resonant structure is studied in the 1.5-to-1.9-GeV mass region of the neutral four-pion system in the reaction π⁺n→pπ⁺π⁺π^-π^- at 6 GeV/c incident momentum. The rho⁰ and A^+-₂ content are determined as a function of the four-pion mass. The 4π mass spectrum is best fitted by two resonances, both of which decay predominantly into rho⁰π⁺π^-, each with evidence for an appreciable A₂π component