Elsevier

Nuclear Physics B

Volume 115, Issue 2, 22 November 1976, Pages 237-248
Nuclear Physics B

Production and decay of the πππ+ system in the reaction πd → dπππ+ at 9 GeV/c

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Abstract

In this paper we present a study of the reaction πd → πππ+d at 9 GeV/c. The mass spectra are in fair agreement with the predictions of a reggeized pion-exchange Deck model. However, the s-channel azimuthal angular distribution indicates a ϱ-exchange Deck contribution. The results of the partial-wave analysis of the (3π) system are compared with those obtained in a hydrogen target: the JP = 2+ contribution is very small (at most 1.5 ± 1.2)% in our data, which are dominated by JP = 1+ for low mass, whereas the JP = 0, 1+, 2 have comparable importance in the higher mass region.

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