PRODUCTION OF HADRONS AT LARGE TRANSVERSE-MOMENTUM IN 200-GEV, 300-GEV, AND 400-GEV P-P AND P-NUCLEUS COLLISIONS

Measurements of the invariant cross section Ed3σd3p are presented for the production of hadrons (π, K, p, and p̄) at large transverse momentum (p) by 200-, 300-, and 400-GeV protons incident on H2, D2, Be, Ti, and W targets. The measurements were made at a laboratory angle of 77 mrad, which corresponds to angles near 90°in the c.m. system of the incident proton and a single nucleon at rest. The range in p for the data is 0.77≤p≤6.91 GeV/c, corresponding to values of the scaling variable x=2ps from 0.06 to 0.64. For p-p collisions, the pion cross sections can be represented in the region x>35 by the form (1pn)(1-x)b, with n=8 and b=9. The ratio of π+ to π- production grows as a function of x to a value larger than 2 at x 0.5. The ratios of the production of K+ and protons to π+ and of K- and antiprotons to π- also scale with x for p-p collisions. The K±, p, and p̄ fitted values for n and b are given. Particle ratios are also presented for D2, Be, Ti, and W targets and the dependences on atomic weight (A) are discussed. © 1979 The American Physical Society.