The study of the A2-meson properties in the π−p- interactions at the incident π−-mesons momentum 3.25 GeV/c

Abstract

Using 55 cm hydrogen bubble chamber exposed in the π⁻ - meson beam at 3.25 ±0.02 GeV/c 160 000 photographs were obtained and 2104 events of the reactions of the type π^-p → pπ⁺π^-π^- and 1766 events of the reactions of the type π^-p → pπ⁺π^-π^-π^o were selected and analysed. In the spectrum of the effective masses of π⁺π^-π^- system from the first reaction A₂-mesons were selected and the analysis was made by means of different methods to determine the spin-parity of this resonance. The second reaction was used to study πη decay mode of the A₂-meson.