Investigation of the reaction π − p → η′π 0 n at the VES spectrometer

Abstract

Results obtained by investigating the reaction π−p → η′π0n at the VES spectrometer (Institute for High Energy Physics, Protvino) are presented. The effective-mass spectrum and angular distributions of η′π0 events are compared with their counterparts for ηπ0 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′π0 and ηπ0 systems over the effective-mass interval 1.45–1.9 GeV/c2 leads to the conclusion that the coupling of the exotic object π1 (1600) to the ρπ channel is suppressed in relation to its coupling to the η′π or the b1(1235)π channel.