| Date&Time | Tue May 24 2022 (17:00 - 18:00) |
|---|---|
| Speaker | Takashi Kaneko |
| Affiliation | KEK and KMI |
| Title | $B \to D^*\ell\nu$ decay on the lattice |
| Abstract | The $B \to D^*\ell\nu$ semileptonic decay is a promising probe of new physics.A tension between the Standard Model and experiments has been reportedfor a decay rate ratio describing lepton flavor universality.However, a long-standing tension in the Cabibbo-Kobayashi-Maskawa matrix elements,$|V_{cb}|$ and $|V_{ub}|$, between the exclusive and inclusive decays suggests thattheoretical and/or experimental uncertainty has not been fully understood.In this talk, we review previous determinations of $|V_{cb}|$, and report onour lattice calculation of the $B \to D^*\ell\nu$ form factors,which are the source of the largest theoretical uncertainty in $|V_{cb}|$.We also report on our on-going studies on the $B \to \pi\ell\nu$and inclusive decays, which are also relevant to the tension in the CKM matrix elements. |
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Nagoya University
Theoretical Elementary Particle Physics Laboratory
Theoretical Elementary Particle Physics Laboratory