Recoil-proton polarization inπpelastic scattering at 547 and 625 MeV/c

The polarization of the recoil proton in ${\pi }^{+}$p and ${\pi }^{\mathrm{-}}$p elastic scattering using a liquid-hydrogen target has been measured for backward angles at 547 and 625 MeV/c. The scattered pion and recoil proton were detected in coincidence using the large-acceptance spectrometer to detect and analyze the momentum of the pions and the JANUS polarimeter to identify and measure the polarization of the protons. Results from this experiment agree with other measurements of the recoil polarization, with analyzing-power data previously taken by this group, and with predictions of partial-wave analyses.