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arXiv 1708.03572hep-ph
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中立的$D\rightarrow K K^*$作为魅力CP破坏的发现渠道而衰减

Neutral $D\rightarrow K K^*$ decays as discovery channels for charm CP violation

Ulrich Nierste, Stefan Schacht

备注：
5 pages. Version to be published in Phys. Rev. Lett
发表信息：
Phys. Rev. Lett. 119, 251801 (2017)
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摘要：

指出$D^0\rightarrow K_{S} K^{*0}$和$D^0\rightarrow K_{S} \overline{K}{}^{*0}$衰变中的CP不对称性是标准模型中魅力CP破坏的潜在发现渠道。我们强调，没有味道标记是必要的，未标记的CP不对称性$a_{CP}^{\mathrm{dir}}(D \to K_S K^{*0})$基本上等于标记的，因此未标记的测量具有显着的统计增益。根据相关的强相，$\vert a_{CP}^{\text{dir, untag}}\vert$可以与$0.003$一样大。CP不对称主要是由交换图产生的，不需要非零企鹅振幅。虽然CP不对称性小于$D^0\rightarrow K_SK_S$的情况，但由于快速衰减$K^{*0}\rightarrow K^+π^-$，实验分析更有效。人们可以进一步在Dalitz图中在$K^{*0}$峰附近寻找有利的强相。

英文摘要：

We point out that the CP asymmetries in the decays $D^0\rightarrow K_{S} K^{*0}$ and $D^0\rightarrow K_{S} \overline{K}{}^{*0}$ are potential discovery channels for charm CP violation in the Standard Model. We stress that no flavor tagging is necessary, the untagged CP asymmetry $a_{CP}^{\mathrm{dir}}(D \to K_S K^{*0})$ is essentially equal to the tagged one, so that the untagged measurement comes with a significant statistical gain. Depending on the relevant strong phase, $\vert a_{CP}^{\text{dir, untag}}\vert$ can be as large as $0.003$. The CP asymmetry is dominantly generated by exchange diagrams and does not require non-vanishing penguin amplitudes. While the CP asymmetry is smaller than in the case of $D^0\rightarrow K_SK_S$, the experimental analysis is more efficient due to the prompt decay $K^{*0}\rightarrow K^+π^-$. One may further search for favourable strong phases in the Dalitz plot in the vicinity of the $K^{*0}$ peak.

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