Dalitz plot analysis of the decay ω →π+π-π0

Abstract

Using a low-background sample of 2.6×105 J/ψ→ωη(ω→π+π-π0,η→γγ) events, about 5 times larger statistics than previous experiments, we present a Dalitz plot analysis of the decay ω→π+π-π0. It is found that the Dalitz plot distribution differs from the pure P-wave phase space with a statistical significance of 18.9σ. The parameters from the fit to data are in reasonable agreement with those without the cross-channel effect within the dispersive framework, which indicates that the cross-channel effect in ω→π+π-π0 is not significant.