## Abstract

Lattice calculations of the form factors for B → D(z.ast;)ℓ ν decays can be used to extract the CKM matrix element |V_{cb}|. The Oktay-Kronfeld action is a highly improved version of the Fermilab action, which systematically reduces heavy quark discretization effects through O(λ^{3}) in HQET power counting, for heavy-light meson quantities. To calculate B → D(z.ast;)ℓ ν semi-leptonic form factors using Oktay-Kronfeld heavy quarks, we need to improve the heavy quark currents to the same level. We report our progress in calculating the improvement coefficients for currents composed of bottom and charm quarks. Our results presented in this paper are preliminary.

Original language | English |
---|---|

Journal | Proceedings of Science |

Volume | Part F128557 |

Publication status | Published - 2016 |

Event | 34th Annual International Symposium on Lattice Field Theory, LATTICE 2016 - Southampton, United Kingdom Duration: 2016 Jul 24 → 2016 Jul 30 |

### Bibliographical note

Publisher Copyright:© Copyright owned by the author(s).

## All Science Journal Classification (ASJC) codes

- General