Update on $B\to D^{\ast }\ell \nu$ form factor at zero-recoil using the Oktay-Kronfeld action

Tanmoy Bhattacharya, Rajan Gupta, Sungwoo Park +9

We present an update on the calculation of $\bar{B}\to D^{\ast }\ell \bar{\nu }$ semileptonic form factor at zero recoil using the Oktay-Kronfeld bottom and charm quarks on $N_f=2+1+1$ fl…