Evidence for narrow structure in the analyzing power of theγreaction

The differential cross section and the analyzing power $A_y$ have been measured for the ${}_{}{}^3{}_{}{}^{}\mathrm{He}(\overrightarrow{p},d)X$ reaction at a deuteron angle of 22° (lab) and a proton momentum of 1.46 GeV/c. Evidence of narrow structure in the missing mass dependence of $A_y$ was observed. The masses of the maxima are compared with other reports of narrow resonance-like structure and with the predictions of theory. Significant correspondence is found.