A partial wave analysis of the neutral (3π) - system produced in the reaction π-p → (π-π0) n at 12 and 15 GeV/c

Data on the charge exchange reaction π-p→ (π+π-π0)n have been taken at beam momenta of 12 and 15 GeV/c, using the CERN Omega Multiparticle Spectrometer. A partial wave analysis has been made of the (3π)0 system. Both natural and unnatural spin parity production are observed. The natural parity states can be identified with established resonances. In addition a natural spin parity enhancement is observed at a mass of about 2 GeV/c2 with Jsup(P) = 4+ preferred. This effect has been called the A2*(2030). The unnatural spin parity production found is consistent with Reggeized Deck Model predictions. No unambiguous A1 or A3 production is observed. (author)