Longke Li

20 August 2019
HADRON2019

Abstract: The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is a substantial upgrade of the B factory facility at the Japanese KEK laboratory. The design luminosity of the machine is 8×1035 cm−2s−1 and the Belle II experiment aims to record 50 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 B and charmed mesons, and τ leptons.We also expect exciting results in the study of exotic quarkonium states. From February to July 2018, the machine has completed a commissioning run, achieved a peak luminosity of 5.5×1033 cm−2s−1, and Belle II has recorded a data sample of about 0.5 fb−1. Regular operations, with the full detector, started in March 25 2019. In this presentation, we will review the status of the experiment and will present the first results of the 2019 run, together with the near-term prospects for quarkonium studies.

Keyword(s): Belle II ; Phase II ; Phase III
Note: 25 min