Measurement of the Matrix Elements for the Decays $\eta \rightarrow \pi^+\pi^-\pi^0$ and $\eta/\eta^\prime\rightarrow\pi^0\pi^0\pi^0$

摘要: Based on a sample of 1.31×109 J/ψ events collected with the BESIII detector at the BEPCII collider, Dalitz plot analyses of selected 79,625 η→π+π−π0 events, 33,908 η→π0π0π0 events and 1,888 η′→π0π0π0events are performed. The measured matrix elements of η→π+π−π0 are in reasonable agreement with previous measurements. The Dalitz plot slope parameters of η→π0π0π0 and η′→π0π0π0 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 three. Final state interactions are found to have an important role in those decays.