The (d)over-right-arrow p->He-3 pi(0) reaction near threshold

Angular distributions for the differential cross section and three deuteron analyzing powers iT(11), T-20, and T-22 Of the reaction <(d)over tilde p-->He-3> pi(0) have been measured over the whole angular domain at 20 energies close to threshold (0.03<T-pi(c.m.)<10.2 MeV). The differential cross section and tensor analyzing power T-20 both show strong variation in energy and angle due to interference between S- and P-wave pion production, whereas iT(11) and T-22 remain consistent with zero over the whole experimental range. All the data at different energies and angles fall on universal curves when plotted as functions of the single variable p(pi)>cos Theta, evaluated in the c.m. The broad features of the results are in line with theoretical expectations.