Longitudinal-phase-space analysis of π+n → π+π-p at 15 GeV/c

3114 events of the reaction π+d → π+π-pp/sub s/, where p/sub s/ is a nonparticipating spectator, were studied in the SLAC 82-inch bubble chamber. A longitudinal-phase-space (LPS) analysis was performed to separate the various t-channel exchange mechanisms, e.g., π or Pomeron exchange. The validity of the LPS method was tested for pion exchange by generating events using the one-pion-exchange model modified by absorption (OPEA). The model and the data agreed extremely well. The principal features of the data include the rho0, f0, Δ0, and N*'s. The LPS analysis also reveals the g0, but a slight modification of the standard LPS selection criteria enhances the g0, as expected by OPEA-model calculations