First observation of $η(1405)$ decays into $f_{0}(980)π^0$

Details First observation of $η(1405)$ decays into $f_{0}(980)π^0$ First observation of $η(1405)$ decays into $f_{0}(980)π^0$

2012-01-13

arxiv.org/abs/1201.2737v2

Physics

High Energy Physics

High Energy Physics - Experiment

Revtex, 6 pages, 4 eps figures, version accepted by Phys. Rev. Letters

Scientific paper

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

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