William Wray Neale

Inclusive production of π0, Ks0, Λ0, and Λ0 in 100, 200 and 360 GeV/c π−p interactions

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−.

Differences betweenp¯pandppinteractions at 8.8 GeV/cand their relationship top¯pannihilations

We report on an experiment in which the SLAC 40-in. hybrid facility was exposed to an 8.8-GeV/c antiproton beam. Using external detectors we have identified a large fraction of nonannihilation events and thus obtained a clean sample of annihilation data. Using proton interactions taken in the same detector at the same energy we have made a detailed study of (p-barp-pp) differences and explored their relationship to p-barp annihilations.

production in 100 GeV/c interactions

We present results on inclusive Δ++ (1236) production in 100 GeV/c pp interactions. In the region |t| < 1 GeV2 we find a cross section of 1.29 ± 0.15 mb. Comparisons with pp interactions at high energies show Δ++ production in pp and pp interactions to be very similar. The decay angular distributions of the Δ++ are consistent with production predominantly through pion-exchange and the properties of the system recoiling from the Δ++ are similar to those of real π+p interactions. However, the pπ+ background is found to show qualitatively similar behaviour. In contrast to the indications of Δ++ production through pion exchange we also find evidence that events proceeding through diffraction dissociation are more likely to contain Δ++ than other events. We present results on the forward production of Δ++ in association with Δ++ and protons.

Production of S = − 2 and −3 baryon states in 6.5 GeV/c K−p interactions

Abstract We present results from a high statistics (46 events/μ;b) experiment on K−p interactions in the Argonne 12 foot bubble chamber. In particular we make a systematic search for Ξ ∗ resonances. We confirm recent evidence of a Ξ(2370), and see a number of other well established states. We also give cross sections for various exclusive and inclusive reactions, including those in which θ− are produced.

Δ++ and Δ++ production in 100 GeV/c pp interactions

We present results on inclusive Δ++ (1236) production in 100 GeV/c pp interactions. In the region |t| < 1 GeV2 we find a cross section of 1.29 ± 0.15 mb. Comparisons with pp interactions at high energies show Δ++ production in pp and pp interactions to be very similar. The decay angular distributions of the Δ++ are consistent with production predominantly through pion-exchange and the properties of the system recoiling from the Δ++ are similar to those of real π+p interactions. However, the pπ+ background is found to show qualitatively similar behaviour. In contrast to the indications of Δ++ production through pion exchange we also find evidence that events proceeding through diffraction dissociation are more likely to contain Δ++ than other events. We present results on the forward production of Δ++ in association with Δ++ and protons.

Diffraction and resonance production in exclusive pp interactions at 100 GeV/c

Abstract We have investigated the reactions p p π + π − a and p p a p p 2π + 2π − at 100 GeV /c . The p p π + π − final state is dominated by diffractive production of a p π + π − ( or p π + π − ) system which shows a strong tendency to form Δ ++ π − ( or Δ ++ π + ) . The process p p a Δ ++ Δ ++ is also observed in this reaction, indicating an energy dependence of s−1.5±0.1. The p p 2π + 2π − channel shows less single diffraction, and has a doubly diffractive component consistent with pomeron factorization. Strong Δ++(Δ++) production is agoain seen, but in contrast to the p p π + π − channel we also observe considerable ϱ0 production.

Strange particle production in neutron-proton interactions at 10–24 GeV/c

Abstract We present results of an experiment on strange particle production in np interactions below 24 GeV/c. We derive cross sections in 25 exclusive channels, and compare them with lower energy data. We see evidence for a significant diffractive contributions to the lower multiplicity processes. We also obtain information about the inclusive production of Λ0, Ξ−, Σ±(1385) and K±(890).

Measurement of the inclusive forward neutron spectrum produced in proton-copper interactions at 24 GeV/c

Abstract We present data on the inclusive neutron spectra produced in the forward direction by the interactions of 23.85 GeV/ c protons in a copper target. The results are in good agreement with the predictions of the triple-Regge model.

Inclusive particle production in 100 GeVc π−p and pp interactions

Abstract We discuss a number of features of π − p interactions at 100 GeV/ c , and in particular we attempt to understand the differences between π − p and p p interactions using p p data from the same experiment. The optics considered include the rates of strange particle production, charge transfer distributions, the partition of energy among various particle species and inclusive meson production in beam and target fragmentation regions, with special reference to constituent models of hadrons.

Measurement of the inclusive forward γ, Λ0 and KS0 spectra produced in proton-copper interactions at 24 GeV/c

Abstract We present data on the inclusive γ, λ 0 and K S spectra produced forward direction by interactions of 23.85 GeV/ c protons in a copper target. The Λ 0 spectra are compared with the predictions of the Hagedorn-Ranft model.