The inclusive proton spectrum for\bar pd \to 3\pi p at rest re-examined |
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Authors: | M P Locher B S Zou |
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Institution: | 1. Paul Scherrer Institute, CH-5232, Villigen PSI, Switzerland
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Abstract: | We re-analyze the spectator proton distribution for ¯pd→π + π? π? p. For this channel previous calculations underestimated the cross section for proton momenta of 300 to 600 MeV/c by about a factor 7 while the channels with higher pion multiplicities and the ¯pd→K¯ Kmπp reactions were well explained. By using detailed experimental information on ¯pn and ¯pp annihilation, meson rescattering can in fact explain the cross section also for the 3π case. The¯ pp annihilation followed by charge exchange pion rescattering is much larger than in the 5π case. Vector meson exchange is small but not negligible at high spectator momenta. |
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