2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/178830The pi0 pi0 mass spectra and angular distributions around KKbar -threshold and at 1.5 GeV in ppbar (at rest) --> 3 pi0 in the Crystal Barrel experiment are reanalyzed by applying the new method, which is consistent with unitarity of S-matrix and expressed directly by resonance parameters. The effects of light sigma-meson production are clearly seen to improve the fit with sigma, in comparing with the fit without sigma.8 pages, 1 Postscript figure, uses ptptex.styHigh Energy Physics - Phenomenologytext