Spin parity studies of the eta pi decay of the A2 meson and investigation of the A2 production mechanism in the reaction pi-minus proton goes to A2-minus proton
The results of a spin parity analysis of the nv-decay mode of the A-meson produced in the reaction A2-p -A2-pare presented. Data for the analysis are drawn from bubble chamber experiments between 3.9 and 16 GeV/c. The analysis favors JP=Z+ for both the upper and lower regions of the AZ' Possible evidence for a weakly produced JP=l daughter state is also presented. The evidence comes largely from an interference effect observed in the lower AZ region. Using the A-nv-data along with data on the decay channel A2- -> p0pi -at 5.0,7.5 and l1.Z GeV/c, the production mechanism of A2 the A-in the reaction A2-p -A2-P is investigated. Assuming that this reaction is dominated by a t channel exchange mechanism the isospin and J parity of the exchange are investigated. The sand t cross section dependence of the data are compared with a simple Regge model.
spin parity, Eta (η) pi decay, A2 meson, A2 production, meson production
University of Illinois - Urbana-Champaign
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