Speaker
Mr
Ran Zhou
(Fermi national accelerator laboratory)
Description
The Cabibbo-Kobayashi-Maskawa (CKM) elements $|V_{cb}|$ and $|V_{ub}|$ are important input parameters in flavor physics; they are necessary for stringent tests of the Standard Model and the search for new physics. The determination of these quantities via exclusive processes requires experimental measurements of semileptonic $B$ or $\Lambda_b$ decays and precise theoretical calculations of the relevant nonperturbative hadronic matrix elements. I will discuss the recent progress in the lattice-QCD calculations of these matrix elements, and I will present, in combination with the latest experimental results, the updates for the exclusive determinations of the CKM elements $|V_{cb}|$ and $|V_{ub}|$. I will also discuss the implication of these results for the inclusive/exclusive tensions in both $|V_{cb}|$ and $|V_{ub}|$, and their impact on tests of the unitarity triangle in the Standard Model.
