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arXiv 0812.1842hep-ph
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用非普适Z'玻色子解释B \to K π反常

Explaining B \to K pi anomaly with non-universal Z' boson

R. Mohanta, A. K. Giri

摘要:

研究了非普适$Z'$玻色子在$B \to K π$衰变模中的作用。在标准模型中,这些模式主要来自$b \to s$ QCD企鹅。因此,在该极限下,人们期望$S_{π^0 K^0} \approx \sin 2 β$、$A_{π^0 K^0} \approx 0$和$A_{π^0 K^-} \approx A_{π^+ K^-}$。发现由于存在小的非企鹅贡献的校正产生$S_{π^0 K^0} > \sin 2 β$和$ΔA_{CP}(K π) \simeq 2.5 %$。然而,$S_{π^0 K^0}$的测量值小于$ \sin 2 β$和$ΔA_{CP}(K π) \simeq 15 %$。我们证明了具有非通用$Z'$玻色子的模型可以成功地解释这些异常。

英文摘要:

We study the effect of non-universal $Z'$ boson in the decay modes $B \to K π$. In the standard model these modes receive dominant contributions from $b \to s$ QCD penguins. Therefore, in this limit one expects $S_{π^0 K^0} \approx \sin 2 β$, $A_{π^0 K^0} \approx 0$ and $A_{π^0 K^-} \approx A_{π^+ K^-}$. The corrections due to the presence of small non-penguin contributions is found to yield $S_{π^0 K^0} > \sin 2 β$ and $ΔA_{CP}(K π) \simeq 2.5 %$. However, the measured value of $S_{π^0 K^0}$ is less than $ \sin 2 β$ and $ΔA_{CP}(K π) \simeq 15 %$. We show the model with a non-universal $Z'$ boson can successfully explain these anomalies.

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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