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We study $B\to J/\Psi \eta^{(\prime)}$ decays and suggest two methods todetermine the $\eta-\eta^{\prime}$ mixing angle. We calculate not only thefactorizable contribution in QCD facorization scheme but also thenonfactorizable hard spectator corrections in pQCD approach. We get thebranching ratio of $B\to J/\Psi \eta$ which is consistent with recentexperimental data and predict the branching ratio of $B\to J/\Psi\eta^{\prime}$ to be $7.59\times 10^{-6}$. Two methods for determining$\eta-\eta^{\prime}$ mixing angle are suggested in this paper. For the firstmethod, we get the $\eta-\eta^{\prime}$ mixing angle to be about$-13.1^{\circ}$, which is in consistency with others in the literature. Thesecond method depends on less parameters so can be used to determine the$\eta-\eta^{\prime}$ mixing angle with better accuracy but needs, as an input,the branching ratio for $B\to J/\Psi \eta^{\prime}$which should be measured inthe near future.

The study of $B\to J/\Psi \eta^{(\prime)}$ decays and determination of $\eta-\eta^{\prime}$ mixing angle