Abstract
The missing mass spectrum opposite the proton in a 750 000 picture exposure, 13 GeV/ c π +p bubble chamber experiment, is investigated in two and four pion channels for structures observed or denied by boson spectrometers at the same energy in the reaction π −p→X −p. In the four pion final state the R + enhancement is observed clearly and the possibility of multi-component mass structure is considered. Treating the phenomenon as one object, cross sections and branching ratios are derived for intermediate quasi two and three body decay modes ( ωπ, ϱϱ, A 2 π, ϱππ). The signals in the two pion state and for the neutral state produced opposite Δ ++(1231) are also presented and an elasticity is calculated.
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