Effect of σ(600)-production in at rest

The π0π0 mass spectra and angular distributions around K K - threshold and at 1.5 GeV in p p (at rest) → 3π 0 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 σ-meson production are clearly seen to improve the fit with σ, in comparing with the fit without σ.