arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0707.0919hep-ph
收藏

强子环对$B_{c}$直接CP破坏的影响

Effects of hadronic loops on the direct CP violation of $B_{c}$

Xiang Liu, Xue-Qian Li

摘要:

在$B$介子衰变过程中,末态相互作用起着重要的作用。在夸克-胶子层次上,末态相互作用对有关过程的贡献可能是长距离效应,而对树图和/或圈图产生的短距离效应的贡献可能是干扰的。该干扰可以为进程$B_{c}^{+}\to D^{0}π^{+}$中的直接CP破坏$\mathcal{A}_{CP}$提供源。我们发现,考虑末态相互作用效应时,$\mathcal{A}_{CP}$的典型值约为-22%,这与不考虑末态相互作用效应时的结果不同。因此,当我们从LHCb和$B$ -factories的新实验数据中提取有关CP破坏的信息时,必须包括末态相互作用的贡献。这项研究可能对未来寻找新的物理学至关重要。

英文摘要:

It is well known that the final state interaction plays an important role in the decays of $B$-meson. The contribution of the final state interaction which is supposed to be long-distance effects, to the concerned processes can interfere with that of the short-distance effects produced via the tree and/or loop diagrams at quark-gluon level. The interference may provide a source for the direct CP violation $\mathcal{A}_{CP}$ in the process $B_{c}^{+}\to D^{0}π^{+}$. We find that a typical value of $\mathcal{A}_{CP}$ when the final state interaction effect is taken into account can be about -22% which is different from that without the final state interaction effect. Therefore, when we extract information on CP violation from the data which will be available at LHCb and the new experiments in $B$-factories, the contribution from the final state interaction must be included. This study may be crucial for searching new physics in the future.

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。

↑