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The \boldmath$B\to D^\ast\ell\nu$ semileptonic decay at nonzero recoil and its implications for $\ |V_{cb}\ |$ and $R(D^\ast)$
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abstract
We present nearly final results from our analysis of the form factors for $B\to D^\ast\ell\nu$ 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 $a\approx0.15$ 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 $R(D^\ast)$.
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Semi-leptonic decays $B \to D^{(*)}(1S,2S)\ell \nu_{\ell}$ within the covariant light-front approach
Covariant light-front quark model calculations of B to D(1S,2S) and D*(1S,2S) semi-leptonic branching ratios match light-lepton data but underpredict tau modes, yielding R(D)=0.261 and R(D*)=0.228.
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