Speaker
Description
We present a calculation of the form factors for $B_{(s)} \to D_{(s)} \ell \nu$ decay using the highly improved staggered quark action for both valence and sea quarks on the MILC collaboration’s $2+1+1$-flavor ensembles with lattice spacings ranging from 0.09fm to 0.03fm, many with physical pion masses. On our finest ensembles, we can compute the form factors directly at the physical $b$-quark mass. In this talk, we present preliminary results of chiral-continuum fits for the scalar and vector form factors. The goal of this project is a percent level determination of the scalar and vector form factors to enable a high-precision determinations of $|V_{cb}|$. It fits into a broader program of lattice-QCD studies of weak $B$-meson decays by the Fermilab Lattice and MILC collaborations.
| Parallel Session (for talks only) | Quark and lepton flavor physics |
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