Youngjoon Kwon

18 July 2023
The 30th International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2023)

Abstract: Precise determination of the magnitudes and phases of the elements, in particular, Vcb and Vub, of the Cabibbo-Kobayashi-Maskawa (CKM) matrix is crucial for testing the unitarity of the CKM matrix, hence testing the Standard Model. The magnitudes of these elements are best measured by using B-meson semileptonic decays. Moreover, semileptonic B-meson decays provide a great testing ground for lepton universality of charged-current weak interaction processes. We reported recent unique and/or competitive results of inclusive and exclusive B-meson semileptonic decays, which have been measured by analyzing high-statistics data sample of BB pairs from the Belle and Belle II experiments. Some of these analyses utilize tag-side reconstruction of a companion B-meson decaying into hadronic final states, providing direct access to the signal rest-frame and the relevant decay characteristics. The subjects we present in this talk are all relevant for either testing lepton universality or precision measurement of the CKM elements Vcb and Vub.

Keyword(s): Semileptonic B ; Belle II ; Belle ; Vub ; Lepton Flavor Universality
Note: 20 minutes including discussions