Evidence for a Dibaryon Signal in the Measurement of Elastic π − d → $$ \pi - \vec d $$ Scattering

The vector analysing power (iT11] in elastic \( \pi - \vec d \) scattering has been measured for several angles at Tπ = 143 and 256 MeV. The results are compared with calculations reported in the literature: At the lower energy Faddeev calculations agree fairly well with the data. At the higher energy the experimental results differ markedly from any conventional calculation, but agree surprisingly well with predictions in which effects of dibaryon resonances are explicitely included.