Analyzing powers inπ+p elastic scattering at intermediate energies

The analyzing power, $A_N$, has been measured for ${\pi }^{+}$p elastic scattering at $p_{\pi }$=471, 547, 625, and 687 MeV/c on a transversely polarized target. The results are compared with three recent partial-wave analyses for the isospin (3/2) channel. The agreement with our data for all three analyses is good at 471 MeV/c and reasonable at 547 and 625 MeV/c. At 687 MeV/c two of the analyses show a sharp maximum near cosθ=-0.4 which is not seen in the data. There is no indication in our data of the existence of new, narrow Δ resonances.