COUPLED-CHANNEL ANALYSIS OF DATA ON (P)OVER-BAR-P-]3-PI(0), ETA-ETA(0), AND ETA-PI(0)PI(0) AT REST, WITH THE N/D METHOD

Details are presented from a coupled channel analysis of Crystal Barrel data on pBARp --> 3pi0, etaetapi0, and etapi0 pi0 at rest, together with the pipi S-wave phase shift up to 1.2 GeV. The annihilation data are well fitted with a pure 1S0 initial state using consistent parameters for resonances in all channels. The annihilation data require two I = 0, J(PC) = 0++ resonances with masses and widths M, GAMMA where M1 = 1340 +/- 40 MeV, GAMMA1 = 255(-40)+60 MeV and M2 = 1505 +/- MeV, GAMMA2 = 150 +/- 20 MeV; the etapi0pi0 data require an I = 1, J(PC) = 0++ resonance with M3 = 1435 +/- 40 MeV and GAMMA3 = 270 +/- 40 MeV. The a0(980) is fitted with a Flatte form with M = 999 +/- 5 MeV, g(etapi) = 221 +/- 20 MeV, and r = gKK/g(etapi) = 1.16 +/- 0.18. The etapipi data suggest a significantly larger width, GAMMA = 75 MeV, for f0(975) than earlier data. They also require an appreciable etapi P wave, which shows weak phase variation and is therefore probably nonresonant.