Elsevier

Nuclear Physics B

Volume 6, Issue 2, 15 June 1968, Pages 174-186
Nuclear Physics B

The four-prong annihilation of 1.2 GeV/c antiprotons in hydrogen (I): Four-pion final state

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Abstract

Approximately 17 000 four-prong annihilations of 1.2 GeV/c antiprotons in hydrogen have been analyzed. The cross section for annihilation into four prongs is 31.6 ± 1.0 mb and the partial cross section for the 4π final state 2.9 ± 0.2 mb. The 4π state, which is reported here, shows production of ϱ0, f0, A2± mesons and an enhancement in the 3π and/or ϱπ system at the mass of the A1 meson. The frequencies of various resonance channels have been determined. Two-body intermediate states account for 40–60% of the 4π final state. Centre-of-mass angular distributions of the pions are presented. A change in the momentum dependence of the forward-backward asymmetry of the pions is observed at a pion momentum corresponding to the production of A2±π+.

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There are more references available in the full text version of this article.

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