Investigation of the reaction π−p → η′π0n at the VES spectrometer

Results obtained by investigating the reaction π − p → η′π 0 n at the VES spectrometer (Institute for High Energy Physics, Protvino) are presented. The effective-mass spectrum and angular distributions of η′π 0 events are compared with their counterparts for ηπ 0 and η′π − events selected from the same data sample. The ratio R of the branching fractions for the decays of a 2 0 (1320) mesons into η′π and ηπ is measured. The result is R=0.047±0.018, which agrees with the value measured previously for a 2 − . An investigation of P-wave production in the η′π 0 and ηπ 0 systems over the effective-mass interval 1.45–1.9 GeV/c2 leads to the conclusion that the coupling of the exotic object π 1 (1600) to the ρπ channel is suppressed in relation to its coupling to the η′π or the b 1(1235)π channel.