The Belle II Project

点击翻译按钮获取中文摘要

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.