Annihilation of Antiprotons in Hydrogen at Rest. II. Analysis of the Annihilation into Three Pions

Analysis of 823 events attributed to the reaction $\overline{p}+p\left(\mathrm{at}\mathrm{rest}\right)\to {\pi }^{+}+{\pi }^{-}+{\pi }^0$ yields the following results: (a) The channel accounts for 7.8% of the annihilations; (b) 0.55±0.05 of the channel proceeds via $\rho$ production, and the capture to $\rho \pi$ is from the ${}_{}{}^3{}_{}{}^{}S_1^{}{}_{}{}^{}$ state; and (c) 0.45±0.05 of the channel is nonresonant and this nonresonant production is from the ${}_{}{}^1{}_{}{}^{}S_0^{}{}_{}{}^{}$ state.