V.P. Kenney

The role of double parton collisions in soft hadron interactions

Abstract We have examined charged multiplicities arising from p−p and p− p collisions over the range of center of mass energies, s , from 30 GeV to 1800 GeV. Results from Tevatron experiment E735 support the presence of double parton interactions. These processes can be seen to account for a large fraction of the increase in the non single diffraction inelastic cross section from energies of about 200 GeV to 1800 GeV.

A Cerium Glass Fiber-Optic Active Target for High Energy Physics Experiments

A fiber-optic plate imaging system has been developed for active target and tracking applications, in which the active element is Ce(3+) in a silicate glass. Particle tracks and interactions have been recorded with a hit density of ¿ 4/mm for minimum ionizing particles and with a spatial resolution ¿ ~ 28¿ m.

Energy dependence of inclusive distributions in pion-induced reactions☆

Abstract We present data on the inclusive distributions π + p → π ± + anything and π − p → π − + anything at momenta from 3.7 to 18.5 GeV/ c . Distributions are presented in the laboratory, center-of-mass and projectile systems, and the approach to scaling is discussed.

Measurement of the stopping power of nuclei for 100 GeV/c protons and antiprotons

Abstract We have studied the reactions p+A→ (p, n)+X and p +A→ p +X at beam momenta of 100 GeV/c for Mg, Ag and Au targets. The rapidity loss of the leading final state protons, antiprotons, and neutrons has been obtained as a measurement of the nuclear stopping power and correlated with the number of slow protons and the multiplicity and momentum of the associated charged particles.

Charged particle multiplicity correlations in

Abstract The correlations between charged particle multiplicitie produced in forward and backward pseudorapidity regions in pp interactions have been measured with a 240 element scintillator hodoscope. The correlation coefficient and the variance of the difference of multiplicities in the two pseudorapidity regions were deterermined for s =0.3−1.8 TeV . These results have been interpreted in terms of a cluster model of particle production.

p\bar{p}

Abstract The design and performance of a TOF system used in a Fermilab collider experiment is evaluated in terms of time, mass, and spatial resolution. The system is designed to survive in a high rate and high background environment. The overall time resolution of the TOF system is measured to be σ = 110 ps.

collisions at

Abstract The diffractively produced low-mass π+π−p system isstudied in the reaction π±p → π±π+π−p. We observe strong N∗(1700) production and determine the branching fraction to π−Δ++ to be 65 ± 15%. A spin-parity analysis (assuming J 7 2 ) yields J P = 5 2 + for the N∗(1700). The study of the decay angular distribution of the N∗(1700) indicates that helicity is conserved in the t-channel rather than in the s-channel.

\sqrt{s}

Inclusive cross sections for π0, Ks0, Λ0 and Λ0 production in 100, 200 and 360 GeV/c π−p interactions are presented and compared with data at other energies. Invariant cross sections for γ, Ks0, Λ0 and Λ0 production are presented in terms of Feynman x, the rapidity y, and transverse momentum squared, pT2. A comparison of the observed γ spectrum is made with the spectra computed assuming that the π0 momentum distribution is identical to that of the observed π+ orπ−.

= 0.3-TeV to 1.8-TeV

We have studied the performance of a scintillating glass fiber-optic plate with minimum ionizing particles. The target is composed of terbium activated cladded-glass cores in a matrix of 25 ¿m spacing. The plate was viewed by a three-stage, electrostatically focussed image intensifier. Particle tracks were observed with a width consistent with the resolution of the device. Details of the detection system and future developments are discussed.

Design and performance of a time-of-flight system for particle identification at the Fermilab collider

Abstract We have studied ϱ − production at 8 GeV / c . The data cannot be explained by one-pion-exchange with absorption and we conclude that vector exchange contributes. This contrasts with ϱ o production at this energy and ϱ − production at lower energy.