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arXiv 0904.1304hep-ph
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探索$B\to J/Ψπ^0$衰变的新物理

Probing new physics in $B\to J/Ψπ^0$ decay

Jing-Wu Li, Dong-Sheng Du, Xiang-Yao Wu

摘要:

我们用QCD改进因子分解和微扰QCD方法相结合的混合形式计算了$B\to J/Ψπ^{0}$的分支比。计算结果与实验数据吻合较好。用这种方法可以计算出$B\to J/Ψπ^{0}$衰变中相当小的企鹅贡献。提出了两种提取弱相$β$的方法。一种是通过混合引起的CP不对称性$S_{J/Ψπ^{0}}$对弱相$β$的依赖关系,另一种是通过混合引起的CP不对称性$A_{CP}$与弱相$β$的关系。结果表明,混合诱导CP不对称性与$Sin(-2β)$的偏差$ \bigtriangleup S_{J/ψπ^0}$为$ \mathcal{O}(10^{-3})$,且不确定性小得多.上述$ \mathcal{O}(10^{-3})$偏差可以为识别新物理提供很好的参考。

英文摘要:

We calculate the branching ratio of $B\to J/Ψπ^{0}$ with a mixed formalism that combines the QCD-improved factorization and the perturbative QCD approaches. The result is consistent with experimental data. The quite small penguin contribution in $B\to J/Ψπ^{0}$ decay can be calculated with this method. We suggest two methods to extract the weak phase $β$. One is through the dependence of the mixing induced CP asymmetry $S_{J/Ψπ^{0}}$ on the weak phase$β$, the other is from the relation of the total asymmetry $A_{CP}$ with the weak phase $β$. Our result shows that the deviation $ \bigtriangleup S_{J/ψπ^0}$ of the mixing induced CP asymmetry from $Sin(-2β)$ is of $ \mathcal{O}(10^{-3})$ and has much less uncertainty. The above $ \mathcal{O}(10^{-3})$ deviation can provide a good reference for identifying new physics.

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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