The Belle II Experiment: Status and Prospects

Abstract

The Belle II experiment at the SuperKEKB energy asymmetric e^{+}e^{-}e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 6\times10^{35}6×1035cm^{-2}s^{-1}cm−2s−1 and the Belle II experiment aims to record 50 ab^{-1}ab−1 of data, a factor of 50 more than its predecessor. With this data set, Belle II will be able to measure the Cabibbo-Kobayashi-Maskawa (CKM) matrix, the matrix elements and their phases, with unprecedented precision and explore flavor physics with BB, charmed mesons, and \tauτ leptons. Belle II has also a unique capability to search for low-mass dark matter and low-mass mediators. In this paper, we will review the status of the Belle II detector, SuperKEKB accelerator and the prospects for physics at Belle II.