# The 35th International Symposium on Lattice Field Theory

18-24 June 2017
Palacio de Congresos
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# Contribution Poster

Palacio de Congresos -

# Improvement of heavy-heavy current for calculation of $\bar{B}\rightarrow D^{(*)}\ell\bar{\nu}$ form factors using Oktay-Kronfeld heavy-quark

## Speakers

• Mr. JAEHOON LEEM

## Content

It is necessary to improve flavor-changing currents for calculating $\bar{B}\rightarrow D^{(*)}\ell\bar{\nu}$ semi-leptonic form factors using Oktay-Kronfeld (OK) heavy-quarks. The OK action reduces the heavy-quark discretization effect up to $\mathcal{O}(\lambda^3)$ in the HQET power counting. To get a full advantage of the OK action, we need to improve the currents up to the same level as well. We check the redundancy in operators added for the improvement, and address other remaining issues. We report the recent progress.

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

Weak Decays and Matrix Elements