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利用北京谱仪 (BES)收集的 7 8× 1 0 6 J/ ψ事例 ,对J/ ψ→γγV(ρ,)衰变道中的η(1 43 0 )共振态进行了分析 .从J/ ψ→γγρ衰变模式得到其质量及衰变宽度分别为 1 43 1± 1 7MeV和 88± 2 8MeV ,衰变分支比Br(J/ ψ→γη(1 43 0 ) )Br(η(1 43 0 )→γρ) =(1 1± 0 5± 0 3 )× 1 0 - 4;而从J/ ψ→γγ衰变模式得到其质量及衰变宽度分别为 1 42 4± 1 5MeV和 73± 58MeV ,衰变分支比Br(J/ ψ→γη(1 43 0 ) )Br(η(1 43 0 )→γ) =(2 0± 1 0± 0 6)× 1 0 - 4.
The η (1 43 0) resonance states in J / ψ → γγV (ρ, ) decay channels are analyzed by using the 7 8 × 10 6 J / ψ case collected by Beijing Spectrometer (BES) → γγρ decay mode, the mass and the decay width are respectively 1 431 ± 1 7MeV and 88 ± 2 8MeV, and the decay branching ratio Br (J / ψ → γη (1 43 0)) Br (η (1 43 0) → γρ ) = (1 1 ± 0 5 ± 0 3) × 1 0 - 4, while the mass and decay width from J / ψ → γγ decay patterns are respectively 1 42 4 ± 1 5 MeV and 73 ± 58 MeV, the decay branch ratio Br (J / ψ → γη (1 43 0)) Br (η (1 43 0) → γ ) = (20 ± 1 0 ± 0 6) × 1 0-4.