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arXiv 1303.0846hep-phhep-ex
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利用$B \to K ππ$和$B \to K K {\bar K}$衰变提取CP破坏相$γ$

Extraction of the CP-violating phase $γ$ using $B \to K ππ$ and $B \to K K {\bar K}$ decays

Bhubanjyoti Bhattacharya, Maxime Imbeault, David London

备注：
9 pages, 2 figures, version accepted for publication in Physics Letters B
发表信息：
Phys. Lett. B, 728, 206 (2014)
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摘要：

使用B{ \sc a}B{ \sc ar}\测量$B^0 \to K^+π^0π^-$，$B^0 \to K^0π^+π^-$，$B^+ \to K^+π^+π^-$，$B^0 \to K^+ K^0 K^-$和$B^0 \to K^0 K^0 {\bar K}^0$衰变的Dalitz图，我们证明了可以干净地提取弱相$γ$。我们找到了四种可能的解决方案。其中三个-- $32^\circ$、$259^\circ$和$315^\circ$ --与SM不一致，而一个-- $77^\circ$ --与SM一致。这种Dalitz图方法的优点是可以获得$γ$的许多独立测量值，从而减少其统计误差。然而，准确确定误差需要对数据有详细的了解。

英文摘要：

Using the B{\sc a}B{\sc ar}\ measurements of the Dalitz plots for $B^0 \to K^+π^0π^-$, $B^0 \to K^0π^+π^-$, $B^+ \to K^+π^+π^-$, $B^0 \to K^+ K^0 K^-$, and $B^0 \to K^0 K^0 {\bar K}^0$ decays, we demonstrate that it is possible to cleanly extract the weak phase $γ$. We find four possible solutions. Three of these -- $32^\circ$, $259^\circ$, and $315^\circ$ -- are in disagreement with the SM, while one -- $77^\circ$ -- is consistent with the SM. An advantage of this Dalitz-plot method is that one can obtain many independent measurements of $γ$, thereby reducing its statistical error. An accurate determination of the errors, however, requires detailed knowledge of the data.

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