Mass Spectrum for π - π - π + Produced in π - p at BeV/c

The negative three-pion mass spectrum between 1.0 and 1.4 BeV has been examined in the reactions ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}p({\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})$, ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}p{\ensuremath{\pi}}^{0}({\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})$, and ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}n{\ensuremath{\pi}}^{+}({\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+})$ for 5-BeV/c incident ${\ensuremath{\pi}}^{\ensuremath{-}}$. In each reaction peaks are observed near 1.06, 1.17, and 1.30 BeV.