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arXiv 0707.2631hep-ph
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$B\to J/Ψη^{(\prime)}$衰变的研究和$η-η^{\prime}$混合角的测定

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

Jing-Wu Li, Dong-Sheng Du

摘要:

我们研究了$B\to J/Ψη^{(\prime)}$的衰变,并提出了两种确定$η-η^{\prime}$混合角的方法。我们不仅计算了QCD因子化方案中的可因子化贡献,而且计算了pQCD方法中不可因子化的硬旁观者修正。我们得到了$B\to J/Ψη$的分支比,这与最近的实验数据是一致的,并预测了$B\to J/Ψη^{\prime}$的分支比为$7.59\times 10^{-6}$ .本文提出了两种测定$η-η^{\prime}$混合角的方法。对于第一种方法,我们得到了$η-η^{\prime}$混合角约为$-13.1^{\circ}$,这与文献中的结果一致。第二种方法依赖于较少的参数,因此可以用于以更好的精度确定$η-η^{\prime}$混合角,但是需要$B\to J/Ψη^{\prime}$的分支比作为输入,该分支比应该在不久的将来测量。

英文摘要:

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

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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