Jets Produced in π^-, π^+, and Proton Interactions at 200 GeV on Hydrogen and Aluminum Targets

This paper presents results from an experiment on the production of jets (groups of particles) with high p_⊥ produced in 200-GeV/c interactions. Results are presented on the comparison of jet cross sections on aluminum and hydrogen targets. The jet fragmentation distributions are also examined. Both the cross section and the jet structure are found to depend strongly on the beam and target types

Measurement of Forward Jets Produced in High-Transverse-Momentum Hadron-Proton Collisions

A measurement of charged-particle production is reported for the forward region in events triggered by high-transverse-momentum (p⊥) jets and single particles. The momentum distributions of forward-going particles are observed to scale in a simple p⊥-dependent longitudinal variable. Forward-going (beam) jets are observed to be tilted away from the original direction by an amount which agrees with muon-pair data when interpreted in a parton (quantum-chromodynamics) model

Observations of the D and E mesons and possible three-kaon enhancements in pi-p→K0K±pi±X,K0K+K-X at 50 and 100 GeV/c

We present results from the study of multikaon final states in the reactions π-p→K0K±π∓X̃, K0K+K-X̃ at 50 and 100 GeV/c. Here X̃ is semi-inclusive, that is, a specific forward topology and an interaction registering in the counters surrounding the target are required. The D(1285) meson is seen in the δπ mode, while the E(1420) meson is observed in both the δπ and the K*K modes. In addition, there are two possible enhancements in the three-kaon final state. The first (M∼1840 MeV) is associated with the K0φ mode and is consistent with being the charmed D0. The second, a K* state (M=2003±14 MeV, Γ=87±43 MeV), decays into KA2

Production and Correlations of Charged Particles with High P_t in 200-Ge V/c π^±p, K^-p, and pp Collisions

Results are presented on the production of single charged particles with transverse momentum in the range of 0.8-4.5 GeV/c in π^±p, K^-p, and pp collisions at 200 GeV/c and on correlations between the trigger particle and particles with opposite azimuthal angle