Study of the Reaction π~–p → η'π~0n at the VES Spectrometer

摘要

Here we present the study of the reaction π~–p → η'π~0n at the VES spectrometer. The mass and angular distributions for the η'π~0 final state are compared with distributions for η'π~0 events, selected from the same data sample. The ratio R = BR(a_2~0(1320) → η'π~0)/BR(a_2~0(1320) → η'π~0) was measured: R = 0.047 ± 0.019, which is in agreement with PDG value. It was shown also that in the 0 final state the production of exotic wave with quantum numbers J~(PC) = 1~(–+) proceeds mainly through unnatural parity exchange. This is an indirect evidence of the fact that the decay width of the exotic meson π_1(1600) into ρπ is much smaller than into b_1(1235)ρ.