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First observation of $\eta(1405)$ decays into $f_{0}(980)\pi^0$
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arxiv 1201.2737 v2 pith:DZFLSQZL submitted 2012-01-13 hep-ex
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abstract
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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The $a_1(1420)$ in a Unitary Coupled-Channel Three-Body Approach
hep-ph 2026-06 unverdicted novelty 6.5 of 10
Unitary coupled-channel three-body model fitted to COMPASS data reproduces the a1(1420) enhancement via triangle singularity, indicating no genuine resonance pole is required.
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