Measurement of the matrix elements for the decays eta -> pi(+)pi(-)pi(0) and eta/eta ' -> pi(0)pi(0)pi(0)
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Based on a sample of 1.31×109 J/? events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 ???+?-?0 events, 33,908 ???0?0?0 events, and 1,888 ????0?0?0 events are performed. The measured matrix elements of ???+?-?0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of ???0?0?0 and ????0?0?0 are determined to be -0.055±0.014±0.004 and -0.640±0.046±0.047, respectively, where the first uncertainties are statistical and the second systematic. Both values are consistent with previous measurements, while the precision of the latter one is improved by a factor of 3. Final state interactions are found to have an important role in those decays. © 2015 American Physical Society.