Polarization observables in π d → elastic scattering: Analyzing powers τ 22 and iT 11 in the forward hemisphere

The vector analyzing power ${\mathit{iT}}_{11}$ and the composite observable ${\mathrm{\ensuremath{\tau}}}_{22}$=${\mathit{T}}_{22}$+${\mathit{T}}_{20}$/ \ensuremath{\surd}6 were measured at 10 incident pion energies between 100 and 294 MeV, in an angular range between 50\ifmmode^\circ\else\textdegree\fi{} and 120\ifmmode^\circ\else\textdegree\fi{}. Two different techniques were applied, the detection of the pion with a magnet spectrometer, and the \ensuremath{\pi}d coincidence method with scintillation counters. In the case of the first technique also two different target materials were used. Consistency among all data was obtained. The experimental data are compared to Faddeev calculations from one of us (H.G.). The discrepancies between theory and experiment are discussed, and an outlook for further research is given.