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- W4298789851 abstract "The decay modes J/ψ→γπ0, γη and γη′ are analyzed using a data sample of 58×106 J/ψ decays collected with the BESII detector at the BEPC. The branching fractions are determined to be: Br(J/ψ→γπ0)=(3.13−0.47+0.65)×10−5, Br(J/ψ→γη)=(11.23±0.89)×10−4, and Br(J/ψ→γη′)=(5.55±0.44)×10−3, where the errors are combined statistical and systematic errors. The ratio of partial widths Γ(J/ψ→γη′)/Γ(J/ψ→γη) is measured to be 4.94±0.40, and the singlet-octet pseudoscalar mixing angle of η−η′ system is determined.3 MoreReceived 25 October 2005DOI:https://doi.org/10.1103/PhysRevD.73.052008©2006 American Physical Society" @default.
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