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- W1966399219 abstract "A partial wave analysis of BES J/ψ→γ(ηπ+π−) data has been performed in the mass region 1.1 to 2.0 GeV. A peak is observed due to η(1440) in the ηπ+π− invariant mass distribution; JP=0− is preferred over 1+. Its mass is M=1385±7 MeV and it decays into both ησ and a0(980)π, with BR[a0(980)π, a0→ηπ/ησ]=0.70±0.12(stat)±0.20(syst). Destructive interference between the two decay modes is observed. In addition, in the higher ηπ+π− mass region, there is a definite 2−+ signal, with M=1840±15 MeV and Γ=170±40 MeV and an additional 0−+ signal at 1760±35 MeV. We also find a possible contribution from a 1++ signal decaying dominantly through a0(980)π; its mass and width are fitted to be M=1505±20 MeV and Γ=130−20+50 MeV." @default.
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