T. Marshall

Preliminary partial-wave analysis of the K+KOs π− system produced in 8 GeV/c K−p interactions

Abstract We have performed a partial-wave analysis of the K + K O S π − system produced in the reaction K − p → K + K 0 S π − Λ / Σ at 8 GeV/c. We present results of a preliminary analysis of approximately 2000 events in the KKπ mass range 1.24–1.64 GeV, with 0.0 2 . In the 1.28 GeV mass region, we observe a small J PG = 0 −+ contribution but little indication of a 1 ++ wave. We observe a large enhancement of events at the threshold of KK ∗ production. Above this threshold the J PG = 1 +− , 1 ++ and 0 −+ waves all contribute, and we see evidence for a 1 +− resonance below the KK ∗ threshold.

Hadroproduction of χc states in 530 GeV/c π− interactions with nuclear targets

We are studying production of χc states in 530 GeV/c π− interactions with several targets. χc mesons are observed in the mode (χ→J/ψ+γ). Only photons that converted to e+e− pairs are used in the reconstruction of the χc mesons. Preliminary analysis shows that the fraction of observed J/ψs coming from χc radiative decays is 0.44±0.09±0.08, and that the relative production rate of χc1 to χc2 is 1.3±0.6.

Mass dependent fits of the partial wave analysis of the K+K̄0π− system

We have performed a partial wave analysis of the K+K0Sπ− system produced in the reaction π−p → K+K0π−n at GeV/c. We present the mass dependent fits to the PWA results for the waves JPG(isobar)=0−+(α0), 0−+(K*), 1++(α0) and 1++(K*).

Preliminary results of p̄p at 8 GeV/c

We are studying the reaction pp→K+K°π−X and pp→Λpπ X. We present mass spectra for the systems produced in these reactions. The data respresent one‐half of the total data collected.

Search for A JPC exotic hybrid meson

This paper describes an experiment that will search for JPC hybrid mesons at the Brookhaven MPS‐II facility. Such explicitly exotic states are allowed in QCD, and are predicted to be in an accessible mass region by several models. The experiment will investigate the production of exotics in the reaction π−p→π−f1p. Expected rates and experimental sensitivity to possible hybrid states are discussed.

Production ofJ/ψmesons inpBecollisions at 530 and800GeV/c

We report on the production of J/psi mesons in 530 and 800 GeV/c proton - Be collisions in the Feynman-x range 0.0 < xf < 0.6. The J/psi mesons were detected via decays into opposite sign muon pairs. Differential distributions for J/psi production have been measured as functions of xf, pT^2, and cosine of the Gottfried-Jackson decay angle. These distributions are compared with results on J/psi production obtained in 515 GeV/c pion - Be collisions, measured by the same experiment, as well as with results from other experiments using incident protons.

Production of

We report on the production of J/psi mesons in 530 and 800 GeV/c proton - Be collisions in the Feynman-x range 0.0 < xf < 0.6. The J/psi mesons were detected via decays into opposite sign muon pairs. Differential distributions for J/psi production have been measured as functions of xf, pT^2, and cosine of the Gottfried-Jackson decay angle. These distributions are compared with results on J/psi production obtained in 515 GeV/c pion - Be collisions, measured by the same experiment, as well as with results from other experiments using incident protons.

J/\psi

This paper describes an experiment that will search for JPC hybrid mesons at the Brookhaven MPS‐II facility. Such explicitly exotic states are allowed in QCD, and are predicted to be in an accessible mass region by several models. The experiment will investigate the production of exotics in the reaction π−p→π−f1p. Expected rates and experimental sensitivity to possible hybrid states are discussed.