Elsevier

Nuclear Physics B

Volume 132, Issue 5, 6 February 1978, Pages 429-438
Nuclear Physics B

Peripheral pn production and decay angular distributions in the reaction πp → (pn)p at 12 GeV/c incident momentum

https://doi.org/10.1016/0550-3213(78)90469-8Get rights and content

Abstract

The reaction πp → (pn)ps, where ps is a slow proton, was measured at 12 GeV/c incident momentum with the CERN-OMEGA spectrometer. Both antiproton and proton were identified uniquely by electronics information. We obtained 1844 events with four-momentum Transfer squared in the range 0.13 ⩽ |t| ⩽ 0.33 GeV2 and with invariant masses M(pn) up to 2.5 GeV. The corresponding cross section in this t range is determined to be σ = 4 ± 0.4 μb. Extrapolating the differential cross section over the whole t range assuming dσ/dt ≈ exp(5.3t) we estimate a cross section of σ = 9.3 ± 2.0 μb. Comparison with data on πp → (pp)ns (where ns is a slow neutron) in the same t range shows that the (pn)ps and (pp)ns cross sections have approximately the same magnitude.

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