Spurious nature of certain unitarity corrections to the isobar model for three hadron final states

Various methods of implementing unitarity corrections to the isobar model for three hadron final states are discussed, and it is explained why some lead to spurious effects because insufficient attention is paid to analyticity. Recent calculations of unitarity corrections in the processes A1→πππ and πN→ππN are shown to contain spuriously large effects. This may explain why fits to the first process were worsened when these corrections were included. (Auth.)