Elizabeth S. Hafen

Inclusive and semi-inclusive ϱ0 production in π−p interactions at 15 GeV/c☆

Abstract We have done an inclusive study of ϱ0 production in π−p interactions at 15 GeV/c. Evidence for two different production mechanisms, in addition to the known quasi two-body processes, is presented: production of ϱ0s in the central region of rapidity similar to the “pionization” region seen in the inclusive studies of pions; and forward production in the beam dissociation region of rapidity. Cross sections and rapidity distributions for the ϱ0 are given inclusively and by topology, and the results are compared with similar studies at other energies and with other incident particles. Results are also presented for the semi-inclusive reaction π−p → pϱ0 + X− and the exclusive final state pπ−ϱ0.

Topological and leading particle cross sections for 147 GeV/c π− -p interactions☆

Abstract Results are reported based on a study of π − p interactions at 147 GeV/ c in the FERMILAB 30-inch Proportional Wire Hybrid Bubble Chamber System. We have measured the topological cross sections and separated two-prong elastic and inelastic channels. In addition, we have extracted leading particle cross sections using the increased momentum resolution of the downstream proportional wire chambers. We have compared our results with experiments and predictions of a simple fragmentation hyphothesis.

Inclusive and semi-inclusive ϱ0 production in π−p interactions at 147 GeV/c

Abstract We present data on inclusive and semi-inclusive ϱ 0 production in 147 GeV/ c π − p interactions. We find a total cross section of 7.3 ± 1.3 mb. Most of this cross section is found in the lower topology events (⩽ 10 prongs), and in the central and forward rapidity regions. The P T 2 dependence of ϱ 0 production, 〈: n > ϱ 0 per event, and the ϱ 0 / π + ratios are also discussed.

A two-component model for two-body nucleon diffraction dissociation and comparison with data from π-p at 3.9 GeV/c and p-p at fermilab and ISR energies

The isospin |M12o|2 amplitude measured by means of π±p interactions at 3.9 GeV/c is compared to the low mass diffraction dissociation distributions in the process p+p→p+X at incident momentum from 175 to 400 GeV/c and p+p→(nπ+)+p at 1500 GeV/c. The comparison is made within the framework of a two-component model which predicts that the properties of the |M12o|2 amplitude at 3.9 GeV/c should be describe the p-p process. This predictio n is shown to be in excellent agreement with the high energy data.