Measurement of the CKM Angle $\phi _3$ at Belle II
Measurement of the CKM Angle $\phi _3$ at Belle II
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DOI：
10.5506/aphyspolb.51.153
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发表时间：
2019-09
影响因子：
0.5
通讯作者：
P. Resmi
中科院分区：
文献类型：
--
作者：
P. Resmi
CKM角的精确测量对于进一步检验标准模型对CP破坏的描述是重要的。测量中涉及的衰变分支分数的较小值限制了精度，因此必须累积更大的数据集才能提高精度。贝儿II实验在SuperKEKB非对称能量e^+e^-对撞机上进行，旨在收集50 ab$^{-1}$的数据，比其前身贝儿实验多50倍。该加速器已于2016年成功调试，并于2018年4月记录了第一次物理碰撞。通过利用B \到D^{（*）}K^{（*）}\$衰变的所有可能的最终状态，可以实现对\phi_3\$的最佳灵敏度。使用完整的数据集，贝儿~II预计将达到1$^{\circ}$的精度为角度$\phi_3 $。这里列出了2018年数据的预期敏感性和重新发现。
The precise measurement of the CKM angle $\phi_3$ is important to further test the Standard Model description of $CP$ violation. The small values of the branching fractions of the decays involved in the measurement limits the precision, hence a larger dataset has to be accumulated to improve the precision. The Belle~II experiment at the SuperKEKB asymmetric-energy $e^+e^-$ collider aims to collect 50~ab$^{-1}$ of data, a factor of 50 more than that of its predecessor Belle. The accelerator has been successfully commissioned in 2016 and the first physics collisions were recorded in April 2018. The best sensitivity to $\phi_3$ can be achieved by harnessing all possible final states of $B \to D^{(*)}K^{(*)}$ decays. With the full dataset, Belle~II is expected to achieve a precision of 1$^{\circ}$ for the angle $\phi_3$. The expected sensitivities and rediscoveries from 2018 data are presented here.