Speaker
Florian Urs Bernlochner
(KIT - Karlsruhe Institute of Technology (DE))
Description
The magnitudes of the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements, in combination with the angles of the Unitarity Triangle, are crucial for testing the standard model. We report a new determination of $|V_{cb}|$ based on $B \to D^* l^+ \nu$ decays in untagged events. Different parameterizations of the semileptonic form factor are used in the extraction of this CKM matrix element. Finally, we also cover the new Belle search for the purely leptonic decay $B \to \mu^+ \nu$, which will allow to determine $|V_{ub}|$. The analyses are based on the full data set recorded by the Belle detector at the KEKB $e^+ e^-$ collider containing 772 million $B\bar{B}$ pairs.
Author
Shohei Nishida
(KEK)
