THE P-]PI(+)+D REACTION CLOSE TO THRESHOLD AT COSY(P)

Differential and total cross sections of the p + p --> pi(+) + d react ion close to threshold were measured employing a magnetic spectrograph with track: reconstruction, a very thin liquid hydrogen target and an accelerated proton beam with high phase space density.. The data reso lve a previous discrepancy between the n + p --> pi(0) + d and the pi( +) + d --> 2p reaction close to threshold indicating that isospin symm etry may be broken in the s-wave part of the cross section. (C) 1998 E lsevier Science B.V.