Speaker
Description
In this talk I will review the status of a calculation of the form factors of the most relevant heavy-to-heavy decay channels. Using seven N_f=2+1+1 HISQ ensembles, with lattice spacings ranging from 0.15 fm down to 0.06 fm, we calculate the form factors of the $B_{(s)}\to D_{(s)}^{(\ast)}\ell\nu$ decays, including correlations among them. More than half of our ensembles feature physical pion masses, and the heavy quarks $(b,c)$ are simulated at their physical masses using the Wilson-Clover action with the Fermilab interpretation.
Even though we have recently seen huge qualitative and quantitative leaps in the characterization of heavy-to-heavy decays, these advances have failed to translate into improvements for the $|V_{cb}|$ inclusive vs exclusive question, or the matter of the LFU ratios. In particular, in the $B\to D^{(\ast)}\ell\nu$ channel, the current situation of the lattice form factors is far from clear. The work presented here is an attempt to address these issues.
| Parallel Session (for talks only) | Quark and lepton flavor physics |
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