High energy physics. Progress report, March 1, 1984-February 28, 1985

A second run of E-609, FNAL, was carried out. Monte Carlo studies emloying a Feynman-Field model were shown to give results dependent on the method used to approximate energy-momentum conservation, while a Field-Fox-Wolfram model fits the E-609 data and lends indirect evidence of gluon bremsstrahlung effects. Comparison of π and p induced large p/sub t/ di-jet events revealed a new, unique event structure with little or no energy along the π-beam direction when compared to the p-beam events. New data were obtained for p-Nuclear collisions at 400 GeV for H, He, Be, C, Al, Cu, Sn, and Pb0, and analysis has commenced. The 200 MeV polarimeter, designed, built, calibrated, and installed on the AGS by our group was successfully and reliably used in the acceleration of AGS polarized protons. Participation in the beam tune up studies helped to attain 40% polarization at 16.5 GeV/c and allowed start up of the pp elastic scattering experiment E-782 (AGS). E-704 received second stage approval with an agreement signed by the director of FNAL. The experiment is scheduled to start January 1987, so that detailed design of equipment was commenced and the need for equipment funds became acute. In addition, progress was made in theoretical physics and in instrumentation. During the year Dr. Paul Stevenson joined our group and started new, basic research in elementary particle theory in the areas of quantum field theory and perturbative QCD. Progress in instrumentation made during the year included a start on MWPC design for E-704 equipment for which Rice is committed. New electronic design studies included a new MWPC readout system and a new I/O Processor