Partial wave analysis of the π0 π0 system produced in π-p charge exchange collisions -: art. no. 072003

A partial wave analysis of the pi (0)pi (0) system produced in the charge exchange reaction pi (-)p --> pi (0)pi (0)n at an incident momentum of 18.3 GeV/c is presented as a function of the pi (0)pi (0) invariant mass m(pi0 pi0) and momentum transfer squared \t \ from the incident pi (-) to the outgoing pi (0)pi (0) system. For small values of \t \, the S-wave intensity shows a broad enhancement at low m(pi0 pi0) with a sharp dip in the vicinity of the f(0)(980). A dip is also observed in the vicinity of the f(0)(1500). There is a rapid variation of the S to D-0 relative phase difference in these mass regions. For large values of \t \, the f(0)(980) appears as a bump. The f(2)(1270), observed in D waves, is produced dominantly by pi exchange at low values of \t \ and a(2) exchange at higher values of \t \.