Paul Gebeline

03 June 2024
BEACH 2024

Abstract: The Belle and Belle II experiments have collected a 1.4 ab−1 sample of e +e − collision data at centreof-mass energies near the Υ(nS) resonances. These samples contain a large number of e +e − → cc¯ events that produce charmed mesons. Direct CP violation is searched for in D0 → K0 SK0 S decays and D-meson decays to a four-body final state. For the four-body decays, asymmetries in the distributions of triple and quadruple moments probe for CP violation. We present searches for rare flavour-changing neutral current c → uℓ+ℓ − processes in several decay modes. Further, we study several decays of the Λc and Ξc to determine branching fractions, as well as CP asymmetries in singly Cabibbo-suppressed decays.