Analyzing power forπ−pcharge exchange in the backward hemisphere from 301 to 625 MeV/cand a test ofπNpartial-wave analyses

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Abstract

The analyzing power of ${\ensuremath{\pi}}^{\ensuremath{-}}p\ensuremath{\rightarrow}{\ensuremath{\pi}}^{0}n$ has been measured for ${p}_{\ensuremath{\pi}}=301\ensuremath{-}625$ MeV/c with a transversely polarized target, mainly in the backward hemisphere. The final-state neutron and a $\ensuremath{\gamma}$ from the ${\ensuremath{\pi}}^{0}$ were detected in coincidence with two counter arrays. Our results are compared with predictions of recent $\ensuremath{\pi}N$ partial-wave analyses by the groups of Karlsruhe-Helsinki, Carnegie-Mellon University-Lawrence Berkeley Laboratory (CMU-LBL), and Virginia Polytechnic Institute (VPI). At the lower incident energies little difference is seen among the three analyses, and there is excellent agreement with our data. At 547 MeV/c and above, our data strongly favor the VPI phases, and disagree with Karlsruhe-Helsinki and CMU-LBL analyses, which are the source of the $\ensuremath{\pi}N$ resonance parameters given in the Particle Data Group table.

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