Speaker
Oliver Witzel
(Universität Siegen)
Description
Form factors describing exclusive semileptonic $B_{(s)}$ decays allow e.g. to extract the CKM matrix elements $|V_{ub}|$ and $|V_{cb}|$ or obtain predictions for R-ratios testing lepton flavor universality. Using the framework of lattice quantum chromodynamics, we present our results for the semileptonic $B_s \to D_s \ell \nu$, $B_s \to K \ell \nu$, and $B \to \pi \ell \nu$ decays.
First we obtain scalar and vector form factors with full error budget for the range of momentum transfer directly accessible in our simulations. Next we show $z$-parameterization fits to extend $q^2$ over the kinematically allowed range. These results are used to extract CKM matrix elements, predict $R$-ratios or perform comparisons to other works.
Primary author
Oliver Witzel
(Universität Siegen)
