Speaker
Description
The Belle II experiment is an upgraded version of the previous Belle experiment and operates at the SuperKEKB energy asymmetric 𝑒+𝑒− collider located at the KEK laboratory in Tsukuba. Together the two experiments have collected more than 1.3 ab-1 of collision data at the Y(4S) resonance and about 200 fb-1 at other bottomonium resonances. A wide physics program has already started, including the measurement of the Cabibbo Kobayashi Maskawa matrix elements and their phases with unprecedented precision, the B and charmed mesons rare decays, 𝜏 lepton physics, lepton flavour violation searches, low-mass dark matter candidate searches, bottomonium spectroscopy and quantum entanglement tests. The Belle II experiment plans to collect few times more data during the current data taking campaign, and to reach up to 50 times more data thanks to a challenging upgrade program, both of the accelerator and of the detector, which is being currently developed.