Joint Semileptonic meeting: LHCb and Theory

Wednesday 29 Apr 2026, 15:00 → 18:45 Europe/Zurich

4/S-056 (CERN)

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

This talk will present a comprehensive analysis of $\bar B_{(s)}^{(*)}\to D_{(s)}^{(*)}$ form factors within the heavy-quark expansion. Such form factors are key theoretical inputs for precision studies of semileptonic $b\to c\ell\nu$ transitions, with direct relevance for Standard-Model tests and for the determination of $|V_{cb}|$. The resulting analysis provide precise predictions for form factors and for phenomenologically relevant observables, including branching fractions, angular observables, and lepton-flavour-universality ratios. I will also discuss a new treatment of subthreshold branch cuts, which is important for a controlled estimate of truncation uncertainties at the percent level.

recording.mp4

15:00 → 15:30 Towards Percent-Level Precision in $\bar B_{(s)} \to D_{(s)}^{(*)} \ell \bar\nu$ Decays

Speaker: Nico Gubernari (University of Cambridge)

talk_Joint_LHCb.pdf

15:30 → 15:45 Discussion