The \boldmath$B\to D^{\ast }\mathrm{\ell }\nu$ semileptonic decay at nonzero recoil and its implications for $\mathrm{\mid }{V}_{cb}\mathrm{\mid }$ and $R(D^{\ast })$

We present nearly final results from our analysis of the form factors for $B\to D^{\ast }\mathrm{\ell }\nu$ decay at nonzero recoil. Our analysis includes 15 MILC asqtad ensembles with $N_f=2+1$ flavors of sea quarks and lattice spacings ranging from $a\approx 0.15$ fm down to $0.045$ fm. The valence light quarks employ the asqtad action, whereas the $b$ and $c$ quarks are treated using the Fermilab action. We discuss the impact that our results will have on $
|V_{cb}\ |$and$R(D^\ast)$.