Abstract
A total of 13920 π − p → p pn events measured in a spark chamber experiment at 9.8 GeV incident π − momentum are compared with our data recently published on the same reaction at 18.8 GeV. The s-dependence of the total cross section, the shape of d 2σ dM dt , and the p p decay angular distributions at both energies suggest that the production process is dominated by one-pion exchange. This is supported by comparison with new π + p → p np and p p → π +π − annihilation data. An interpretation of the angular distribution by partial waves is discussed, and results from a fit with a Breit-Wigner parametrization are presented. The cross section for the reaction π − p → p pn in the range M p p ⩽ 2.7 GeV and | t np| ⩽ 0.3 GeV 2 has been determined to be σ = 6.5 ± 0.9 μb at 9.8 GeV.
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