The Belle II Project

Belle II将在位于日本KEK实验室的高亮度SuperKEKB e+e对撞机上探索粒子物理的“味道部分”。物理操作将于2016年末或2017年开始，目标是到2023年收集50个倒数据库数据，这是前两代B工厂-SLAC的PEP-II和KEK的KEKB综合光度总和的30倍。这个精密前沿设施将打开一扇令人兴奋的窗口，了解现有对撞机(包括大型强子对撞机)无法触及的新能源尺度，因为量子环路修正对非常大的、尚未发现的粒子很敏感。这些假想的粒子表现在对涉及底夸克、魅力夸克和tau轻子的过程的精确测量中，例如CP破坏和其他不对称、罕见的衰变，以及我们目前对物理的理解所禁止的过程。如果在大型强子对撞机上发现了新的物理学，那么在百丽二号上可能进行的大范围测量将以强子对撞机所不可能实现的方式阐明其结构。如果大型强子对撞机没有发现新的物理，Belle II的测量将通过发现新的现象和偏离标准模型预期的情况，或者通过排除可能的新物理模型，来为超越标准模型的理论提供关键指导。该小组将专注于轻子和半轻子B衰变的研究，包括B-&gt；tau nu和B-&gt；D(*)tau nu；搜索轻子味道中违反tau轻子衰变的新物理的证据；搜索低质量希格斯的证据，并在这些数据中搜索暗物质的证据。

Belle II will probe the 'flavour sector' of particle physics at the high-luminosity SuperKEKB e+e- collider, located at the KEK laboratory in Japan. Physics operations will start in late 2016 or 2017, with the goal of collecting 50 inverse attobarns of data by 2023, which is thirty times the combined integrated luminosity of the two previous generation B-factories, PEP-II at SLAC and KEKB at KEK. This precision-frontier facility will open an exciting window on new energy scales beyond the reach of existing colliders, including the LHC, by virtue of quantum loops corrections that are sensitive to very massive, and as yet undiscovered, particles. These hypothesized particles manifest themselves in precision measurements of processes involving bottom and charm quarks and tau leptons, such as CP violation and other asymmetries, rare decays, and processes that are forbidden within our current understanding of physics. If new physics is discovered at the LHC, the wide range of measurements possible at Belle II will illuminate its structure in ways that are not possible at a hadron collider. If new physics is not discovered at the LHC, Belle II measurements will provide critical guidance towards beyond-the-standard-model theories by either discovering new phenomena and deviations from standard model expectations, or by excluding possible models of new physics. The group will focus on studies of leptonic and semileptonic B decays, including B->tau nu and B->D(*)tau nu; searches for evidence of new physics in lepton flavour violating decays of the tau lepton; searches for evidence of a low mass Higgs and searches for evidence of dark matter in these data.