Production of hadrons at large transverse momentum in 200-, 300-, 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⊥=2p⊥s 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 (1p⊥n)(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.