Systematic study of Kπ production in the reaction K ±p→K S0π±p: technique and measurements at 10 GeV/ c

Abstract

A two-arm spectrometer for simple event topologies is described. Its main characteristics are: (i) large solid-angle acceptance for the forward emitted particles, owing to the absence of magnetic-momentum analysis; (ii) high-resolution time-of-flight measurement of the recoil proton, in the momentum-transfer range 0.05 < | t| < 1 (GeV/ c) 2; (iii) high data-taking rate and on-line pattern recognition. The apparatus has been used for a systematic study of the Kπ system produced in the reaction K ±p→K S 0 π ±p at 10 GeV/ c. We present the results in terms if spherical harmonic moments of the Kπ decay angular distribution.