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arXiv 1306.2658hep-phhep-ex
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$B^0_s \to K^-π^+$、$B^0 \to K^+π^-$衰变中的CP破坏和对SU的检验（3）味对称性预测

CP Violation in $B^0_s \to K^-π^+$, $B^0 \to K^+π^-$ Decays and Tests for SU(3) Flavor Symmetry Predictions

Xiao-Gang He, Siao-Fong Li, Hsiu-Hsien Lin

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摘要：

LHCb合作最近测量了$B^0_s$衰变中的第一个直接CP破坏，其速率不对称性$A_{CP}(B^0_s\to K^- π^+)$给出。同时他们也对$A_{CP}(B^0 \to K^+ π^-) = -0.080\pm 0.007(stat)\pm 0.003(syst)$进行了最精确的测量。这些数据证实了在SU（3）味对称的标准模型中预测的关系，$A_{CP}(B^0 \to K^+ π^-)/A_{CP}(B^0_s \to K^- π^+) = - Br(B^0_s\to K^- π^+)τ_{B^0}/Br(B^0 \to K^+ π^-)τ_{B^0_s}$。我们讨论了由于SU（3）破缺效应对这种关系的可能修改。在B衰变中还有其他几个类似的关系。利用现有的数据，我们研究是否相关的关系举行$B^0$和$B^0_s$ $PP$和$PV$衰变。这里$P$和$V$表示味八重态表示中的赝标量和矢量介子。

英文摘要：

The LHCb collaboration has recently measured the first direct CP violation in $B^0_s$ decays with a rate asymmetry $A_{CP}(B^0_s\to K^- π^+)$ given by $0.27 \pm 0.04(stat)\pm 0.01(syst)$. At the same time they also made the most precise measurement for $A_{CP}(B^0 \to K^+ π^-) = -0.080\pm 0.007(stat)\pm 0.003(syst)$. These data confirm the predicted relation, $A_{CP}(B^0 \to K^+ π^-)/A_{CP}(B^0_s \to K^- π^+) = - Br(B^0_s\to K^- π^+)τ_{B^0}/Br(B^0 \to K^+ π^-)τ_{B^0_s}$, in the standard model with SU(3) flavor symmetry. We discuss possible modifications due to SU(3) breaking effects to this relation. There are several other similar relations in B decays. Using current available data we study whether relevant relations hold in $B^0$ and $B^0_s$ to $PP$ and $PV$ decays. Here $P$ and $V$ indicate pesudoscalar and vector mesons in the flavor octet representations.

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