Abstract: A new approach for the (η)' (and (η))-(η)_cmixing is discussed on the basis of the axial anomaly in QCD. Through (η)'((η))-(η)_c mixing the calculated J/(ψ)->(γ)(η)' and J/(ψ)->(γ)(η) decay widths agree with experimental data. By the mixing of (η)'((η)) with excited state (η)'_c, branching ratios BR((ψ)'->(γ)(η)') = (1.8±0.9)×10^-4 and BR((ψ)'->(γ)(η)) = (3.4±1.5)×10^-5 are predicted. In particular, by the mixing between (η)' and color-octet(cc)₈ pair and b->(cc)₈s decay, the large branching ratio for B->(η)'Xdecay observed by CLEO recently may be explained.

Key words: QCD axial anomaly, (η)'-(η)_cmixing, B->, (η)'X decay

摘要： 基于量子色动力学(QCD)的轴矢反常，讨论确定η'(以及η)与η_c混合的 新方法。通过η'-η_c和η-η_c混合机制可以得到与实验符合的J/ψ→γη' 和J/ψ→γη衰变宽度。由η'(以及η)与激发态η_c'的混合，预言分支比BR(ψ'→γη')=(1.8±0.9)×10^-4，BR(ψ'→γη)=(3.4±1.5)×10^-5。特别是，通过η'与色八重态粲夸克对(cc)₈的混合和b→(cc)₈s衰变，有可能 解释最近CLEO观察到的B→η'X衰变过程的大分支比。

关键词: QCD反常, η'-η_c混合, B→η'X衰变