Abstract
The decays and are analyzed using a sample of 225 million $\jpsi$ events collected with the BESIII detector. The decay of $η(1405)\ar f_{0}(980)π^0$ with a large isospin violation is observed for the first time. The width of the observed in the dipion mass spectra is anomalously narrower than the world average. Decay rates for three-pion decays of the are also measured precisely.
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