Abstract
New data on longitudinal invariant structure functionsE dσ/dx for several low-pT fragmentation processes in pn interactions at 19 GeV/c are presented, based on a bubble chamber study of pd collisions. We investigate the single-particle processes n → π±, p → π±, n → p, n/p → ρ0, p → pinel and p → Δ++(1232) as well as the dipion processes n → π−π−, n → π+π+, n → π+π− and p → π−π−. We have also considered our data on pp collisions at 19 GeV/c regarding p → π−, p → KS0 and p → Λ. The structure functions of these processes are, in the fragmentation region, adequately fitted byE dσ/dx∝(1−|x|)n. Similar fits are made to published data on hadron-neutron interactions and ISR data on pp → n+X. The results are compared with earlier data on proton fragmentation. The values ofn show no energy dependence. They are in qualitative agreement with the recently formulated quark counting rules, but some quantitative disagreements are observed.
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