Seema Choudhury

03 June 2024
BEACH 2024

Abstract: The Belle II experiment has collected a 424 fb−1 sample of 𝑒+𝑒− collisions produced by the asymmetric SuperKEKB collider. Ninety percent of the sample is at the Υ(4𝑆) resonance, which decays to 𝐵-meson pairs. The predecessor experiment, Belle, collected nearly 1 ab−1 of data from 1999-2010, three-quarters of which was at the Υ(4𝑆). From these Υ(4𝑆) data, we have made measurements of rare 𝐵 decays and 𝐶𝑃 violation, as well as searched for lepton-universality violation. Highlights include the first observation of 𝐵→𝐾𝜈𝜈¯ and measurements of lepton-universality in semitauonic 𝐵 decays.