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We present recent progress in calculating the semileptonic form factors$h_{A_1}(w)$ for the $\bar{B} \to D^{\ast} \ell \bar{\nu}$ decays. We use theOktay-Kronfeld (OK) action for the charm and bottom valence quarks and the HISQaction for light quarks. We adopt the Newton method combined with the scanningmethod to find a good initial guess for the $\chi^2$ minimizer in the fittingof the 2pt correlation functions. The main advantage is that the Newton methodlets us to consume all the time slices allowed by the physical positivity. Wereport the first, reliable, but preliminary results for $h_{A_1}(w)/\rho_{A_1}$at zero recoil ($w=1$). Here we use a MILC HISQ ensemble ($a = 0.12$ fm,$M_{\pi}$ = 220 MeV, and $N_f = 2 + 1 + 1$ flavors).

Current progress on the semileptonic form factors for $\bar{B} \to D^{\ast} \ell \bar{\nu}$ decay using the Oktay-Kronfeld action