Improvement of heavy-heavy current for calculation of B̅ → D(*)lv̅ form factors using Oktay-Kronfeld heavy quarks

Jon A. Bailey, Yong-Chull Jang, Weonjong Lee, Jaehoon Leem, M. Della Morte, P. Fritzsch, E. Gámiz Sánchez, C. Pena Ruano
2018 EPJ Web of Conferences  
The CKM matrix element |V_cb| can be extracted by combining data from experiments with lattice QCD results for the semileptonic form factors for the B̅→ D^(*)ℓν̅ decays. The Oktay-Kronfeld (OK) action was designed to reduce heavy-quark discretization errors to below 1%, or through O(λ^3) in HQET power counting. Here we describe recent progress on bottom-to-charm currents improved to the same order in HQET as the OK action, and correct formerly reported results of our matching calculations, in which the operator basis was incomplete.
doi:10.1051/epjconf/201817514010 fatcat:viqkpq62uraazgmb225e2gg7qy