[en] The structure of the weak hadronic current coupled to the tau is investigated via some of the hadronic decays of the tau. The vector current coupling is determined by measuring the tau → rhoν/sub tau/ branching ratio. The axial-vector coupling is determined by measuring the tau → πν/sub tau/ branching ratio. The Cabibbo structure of the hadronic current is established by observing the decay tau → K*(890)ν/sub tau/, and measuring its branching ratio. The branching ratios for the decays tau → e anti ν/sub e/ν/sub tau/ and t → μ antiν/sub μ/ν/sub tau/ are measured as a normalization for the hadronic decays and as a check on the validity of the measurements. The leptonic branching ratios agree well with previous experiments. From a kinematic fit to the pion energy spectrum in the decay tau → πν/sub tau/ an upper limit (95% confidence level) of 245 MeV is placed on the tau neutrino mass. From a simultaneous fit of the center of mass energy dependence of the tau production cross section and the pion energy spectrum in the decay tau → πν/sub tau/, the tau mass is determined to be 1.787 +- .010 GeV/c. All properties of the tau measured here are consistent with it being a sequential lepton coupled to the ordinary weak hadronic current

[en] The CP-violating parameter sin 2β is directly measured using 110 pb^-1 of data accumulated with the CDF detector at the Fermilab anti pp Tevatron collider operating at √s = 1.8 TeV. The signal consists of 395 ± 31 B_d⁰ r_arrow J/ψ K_s events. Three tagging methods are used to identify the type of B meson at production (B_d⁰ or anti B_d⁰). From the CP asymmetry, sin 2β is measured to be 0.79 _-0.44^+0.41, consistent with Standard Model predictions. Sin 2β is in the interval 0 lt sin2β lt 1 at the 93% confidence level

[en] The structure of the weak hadronic current coupled to the tau is investigated via some of the hadronic decays of the tau. The vector current coupling is determined by measuring the tau → rho ν/sub tau/ branching ratio. The axial-vector coupling is determined by measuring the tau → π ν/sub tau/ branching ratio. The Cabibbo structure of the hadronic current is established by observing the decay tau → K*(890)ν/sub tau/ and measuring its branching ratio. The branching ratios for the decays tau → e anti ν/sub e/ν/sub tau/ and tau → μ anti ν/sub μ/ν/sub tau/ are measured as a normalization for the hadronic decays and as a check on the validity of the measurements. The leptonic branching ratios agree well with previous experiments. From a kinematic fit to the pion energy spectrum in the decay tau → π ν/sub tau/, an upper limit (95% confidence level) of 245 MeV is placed on the tau neutrino mass. From a simultaneous fit of the center of mass energy dependence of the tau production cross section and the pion energy spectrum in the decay tau → π ν/sub tau/, the tau mass is determined to be 1.787 +- .010 GeV/c. All properties of the tau measured here are consistent with it being a sequential lepton coupled to the ordinary weak hadronic current

[en] Preliminary results on two-photon interactions from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. The cross section for eta' production by the reaction e⁺e^- → e⁺e^- eta' has been measured over the beam energy range from 2 to 4 GeV. The radiative width GAMMA/sub γγ/(eta') has been determined to be 5.8 +- 1.1 keV (+- 20% systematic uncertainty). Upper limits on the radiative widths of the f(1270), and A₂(1310) and f'(1515) mesons have been determined

[en] Preliminary results are given from the Mark II experiment at SPEAR on radiative decays of the psi' (3684) and on inclusive baryon production from 3.67 to 7.4 GeV center-of-mass energy. A 90% confidence level upper limit of 0.12% is given for BR[psi' → γeta'/sub c/(3455)] x BR[eta'/sub c/(3455 → γpsi)]. 10 references

[en] Some recent results are presented from the Mark II detector at SPEAR: observation of some new D meson decay modes, including the Cabibbo suppressed K^-K⁺ and π^-π⁺ modes, measurements of the rho ν and πν decays of the tau, and some new data on psi decays. 17 references

[en] First results from the SLAC-LBL Mark II magnetic detector at SPEAR are presented. The performance of the detector is discussed and preliminary results are given on inclusive baryon production R/sub p + anti p/, R/sub Λ + anti Λ/, on decay modes of the D mesons and on two-photon production of eta' mesons

[en] This report discusses research in the following areas of high energy physics: B meson mixing; CDF response to low energy jets; jet scaling behavior; search for pair produced leptoquarks at CDF; SSC program; quantum field theory; and neural networks. (LSP)

[en] The Brandeis experimental particle physics group has for many years pursued an understanding of physical interactions at the highest available energies. To this end they have been active in the development of the Collider Detector at Fermilab (CDF) and in the development of detectors that were planned for the SSC. They have also had an active program of analysis to understand the data and its implications from these detectors. Brandeis remains fully engaged in the understanding of physical interactions at the highest available energies. While pursuing physics analysis, detector support activities and detector upgrades at CDF, they are also exploring the physics potential of the LHC. Pending overall agreements between the Department of Energy and CERN, the authors have joined the ATLAS experiment at CERN. The expertise gained in planning SSC detectors is directly applicable there. During the past year, the theoretical physics group pursued research in quantum field theory, with the 1/N expansion and other non-perturbative methods providing a unifying theme of much of this work. Activities centered on large N limit in scalar field theories, and two-dimensional Yang-Mills theories

[en] This report discusses the following topics: Z neutral boson decay asymmetry; B-anti-B mixing; top quark search; measurement of the inclusive central jet cross section; search for pair produced leptoquarks at cdf; direct photon production; calibration of cdf; hadronic energy scale for the cdf central calorimeters; skyrme model; two and three dimensional field theory; the path integral on a branched manifold; and mean-field theory of neural networks