The Belle II experiment aims to record 50 ab$^{-1}$ data with the highluminosity to be provided by the SuperKEKB asymmetric-energy electron-positroncollider. The anticipated high statistics data enables us to perform studies of$B$ decays involving $\tau$ leptons such as $B^+ \to \tau^+ \nu_\tau$ and $B\to D^{(*)} \tau^+ \nu_\tau$ modes. The precise measurements of branchingfraction and of the $\tau$ lepton polarization in these $B$ decays provide avery sensitive indirect search for a charged Higgs boson. Belle II sensitivityfor the charged Higgs is complementary to direct searches at ATLAS and CMS.With the large data sample and by using dedicated triggers the Belle IIexperiment is expected to explore dark sector by searching for visible andinvisible decays of the dark photon and the dark Higgs boson, and by alsosearching for low mass dark matter with unprecedented precision.
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机译：Belle II实验旨在以SuperKEKB非对称能量电子-正电子对撞机提供的高发光度记录50 ab $ ^ {-1} $数据。预期的高统计数据使我们能够对涉及$ \ tau $轻子的$ B $衰减进行研究，例如$ B ^ + \ to \ tau ^ + \ nu_ \ tau $和$ B \ to D ^ {（*）} \ tau ^ + \ nu_ \ tau $模式。在这些$ B $衰变中，分支分数和$ \ tau $轻子极化的精确测量提供了对带电希格斯玻色子的平均敏感间接搜索。 Belle II对带电的希格斯光子的灵敏度是对ATLAS和CMS直接搜索的补充，借助大量数据样本和专用触发器，Belle II实验有望通过搜索暗光子和希格斯玻色子的可见和不可见衰变探索暗区。 ，并且还以前所未有的精度寻找低质量的暗物质。
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