Progress of Belle II – detector and performance

The progress on the detector and accelerator in the Belle II experiment is presented. The B factories have successfully accumulated the experimental data at ϒ(4S) and achieved the world highest sensitivity on the search for lepton flavor violating tau decays and other new physics searches. The Belle II experiment will obtain 50 times larger data samples compared to the Belle experiment and improve the detector sensitivity. The construction of the detector and accelerator is in progress. The commissioning will start in 2014 and the expected integrated luminosity is 50ab−1 by 2022.