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arXiv 0911.2399hep-ph
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族非普适$Z'$模型中$B\to K^{(*)} \ell^+\ell^-$衰变的研究

Study of $B\to K^{(*)} \ell^+\ell^-$ Decays in the Family Non-universal $Z'$ Models

Cheng-Wei Chiang, Run-Hui Li, Cai-Dian Lü

摘要:

在对$B\to K^{(*)}\ell^+\ell^-$衰变的综合研究中,导出了族非普适$Z^{\prime}$模型中相关耦合的约束条件。我们发现,在允许的参数空间内,最近观察到的前向后不对称的$B\to K^*\ell^+\ell^-$衰变可以解释,通过翻转威尔逊系数$C_9^{\rm eff}$和$C_{10}$的符号。利用得到的约束条件,我们还计算了$B_s\toμ^+μ^-$衰变的分支比.我们预测的上界接近CDF协作组最近给出的上界。

英文摘要:

In a combined investigation of the $B\to K^{(*)}\ell^+\ell^-$ decays, constraints on the related couplings in family non-universal $Z^{\prime}$ models are derived. We find that within the allowed parameter space, the recently observed forward-backward asymmetry in the $B\to K^*\ell^+\ell^-$ decay can be explained, by flipping the signs of the Wilson coefficients $C_9^{\rm eff}$ and $C_{10}$. With the obtained constraints, we also calculate the branching ratio of the $B_s\toμ^+μ^-$ decay. The upper bound of our prediction is near the upper bound given by CDF Collaboration recently.

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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