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We study the decays of the J/psi and psi' mesons to pi+pi-pi0 using datasamples at both resonances collected with the BES III detector in 2009. Wemeasure the corresponding branching fractions with unprecedented precision andprovide mass spectra and Dalitz plots. The branching fraction for J/psi ->pi+pi-pi0 is determined to be (2.137 +- 0.004 (stat.) +0.058-0.056 (syst.)+0.027-0.026 (norm.))*10-2, and the branching fraction for psi' -> pi+pi-pi0 ismeasured as (2.14 +- 0.03 (stat.) +0.08-0.07 (syst.) +0.09-0.08 (norm.))*10-4.The J/psi decay is found to be dominated by an intermediate rho(770) state,whereas the psi' decay is dominated by di-pion masses around 2.2 GeV/c2,leading to strikingly different Dalitz distributions.

Precision measurement of the branching fractions of J/psi -> pi+pi-pi0 and psi' -> pi+pi-pi0