π−πscattering andπ+dinteractions at 7 GeV/c

Abstract

Using bubble-chamber data on the reactions ${\pi }^{+}d\to p_{s}p{\pi }^0{\pi }^0$, ${\pi }^{+}d\to p_{s}p{\pi }^{+}{\pi }^{-}$, and ${\pi }^{-}p\to n{\pi }^{+}{\pi }^{-}$ at 7 GeV/c incident $\pi$ momentum, $\pi -\pi$ phase shifts are determined for $0.6<M\left(\pi \pi \right)<\mathrm{}1.5\mathrm{}$ GeV/${\mathit{c}}^2$. An $I=0\mathrm{}$ $S$-wave resonance is observed in the $f^0$ peak region of $M\left(\pi \pi \right)$. Constructive $\rho -\omega$ interference is found in the reaction ${\pi }^{+}n\to p{\pi }^{+}{\pi }^{-}$ and evidence is presented for some specifically deuteron effects in the data with large spectator-proton momentum.