Joint Semileptonic meeting: LHCb and Theory

Wednesday 21 Oct 2026, 15:00 → 18:45 Europe/Zurich

4/S-030 (CERN)

Biljana Mitreska (The University of Manchester (GB)), Ricardo Vazquez Gomez (University of Barcelona (ES))

We investigate the $|V_{cb}|$ determinations from exclusive semi-leptonic $\bar{B} \to D^{(*)}\ell\bar\nu$ decays, together with comprehensive Bayesian fit analyses of the $\bar{B} \to D^{(*)}$ transition form-factors, by taking into account recent updates of experimental distribution data and theoretical evaluations. Several commonly adopted form-factor parameterizations, including BSZ, BGL and HQET, have been considered under different fit scenarios. In this talk, we compare the fitted values and study how the $|V_{cb}|$ determinations depend on the form-factor parameterizations and on the treatment of the experimental inputs. We also consider new-physics effects that can contribute to $\bar{B} \to D^{(*)}\ell\bar\nu$ and study if non-zero new physics effect is allowed behind the $|V_{cb}|$ determinations.  

video1344687822.mp4

15:00 → 15:30 $V_{cb}$ determinations from $B \to D^{(*)} \ell \nu$ decays within the SM and beyond

Speaker: Ryotaro Watanabe (Central China Normal University)

LHCbTheory_watanabe.pdf

15:30 → 16:15 Discussion