Abstract

We calculate the $B\!\to\!D^{(*)}\ell\nu$ form factors in 2+1 flavor relativistic lattice QCD by employing the Moebius domain-wall action for all quark flavors. Our simulations are carried out at lattice cut-offs $a^{-1} \sim 2.5$, 3.6 and 4.5 GeV with the bottom quark masses up to 0.7 $a^{-1}$ to control discretization effects. We extrapolate the form factors to the continuum limit and physical quark masses, and discuss systematic uncertainties of the form factors.

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