The Belle II Project

贝儿二号将在位于日本KEK实验室的高亮度SuperKEKB e+e对撞机上探测粒子物理学的“味道部分”。物理操作将于2016年底或2017年开始，目标是到2023年收集50个逆阿托巴恩的数据，这是上一代B工厂（SLAC的PEP-II和KEK的KEKB）的综合亮度的30倍。这个精确前沿的设施将打开一个令人兴奋的窗口，在新的能量尺度超出现有的对撞机，包括大型强子对撞机，凭借量子回路校正是敏感的非常大的，但尚未发现，粒子。这些假设的粒子在涉及底夸克、粲夸克和τ轻子的过程的精确测量中表现出来，例如CP破坏和其他不对称性、罕见的衰变以及我们目前对物理学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，那么贝儿II可能进行的广泛测量将以强子对撞机无法实现的方式阐明其结构。如果LHC没有发现新的物理学，贝儿II测量将通过发现新的现象和偏离标准模型的期望，或者通过排除新物理学的可能模型，为超越标准模型的理论提供关键的指导。该小组将专注于研究轻子和半轻子B衰变，包括B->tau nu和B->D（*）tau nu;寻找轻子味违反tau轻子衰变的新物理学证据;寻找低质量希格斯粒子的证据，并在这些数据中寻找暗物质的证据。

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.