# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
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# Contribution Parallel

Andalucía I
Weak Decays and Matrix Elements

# Calculation of $\bar{B} \rightarrow D^\ast \ell \bar{\nu}$ form factor at zero-recoil using the Oktay-Kronfeld action

## Speakers

• Mr. Sungwoo PARK

## Content

We present preliminary results of the calculation of $\bar{B} \rightarrow D^\ast \ell \bar{\nu}$ form factor at zero recoil. We use $N_f=2+1+1$ MILC HISQ ensembles. The charm and bottom quarks are implemented using the Oktay-Kronfeld (OK) action. For the light spectator quark, we use the HISQ action. We also report a recent progress in determining the critical hopping parameter $\kappa_\text{crit}$ in a completely non-perturbative way.

## Preferred track (if multiple tracks have been selected)

Weak Decays and Matrix Elements