Semileptonic decays $B\to D^{(\ast )}l\nu$ at nonzero recoil

Abstract

We have analyzed the semileptonic decays $B\to D\ell \nu$ and $B\to D^{\ast }\ell \nu$ on the full suite of MILC (2+1)-flavor asqtad ensembles with lattice spacings as small as 0.045 fm and light-to-strange-quark mass ratios as low as 1/20. We use the Fermilab interpretation of the clover action for heavy valence quarks and the asqtad action for light valence quarks. We compute the hadronic form factors for $B\to D$ at both zero and nonzero recoil and for $B\to D^{\ast }$ at zero recoil. We report our results for $|V_{cb}|$.

Comments: 7 pp, 4 figures, Lattice 2013