Matching of heavy-light flavour currents between HQET at order 1/m and QCD: I. Strategy and tree-level study

Abstract

We present a strategy how to match the full set of components of the heavy-light axial and vector currents in Heavy Quark Effective Theory (HQET), up to and including 1/m h -corrections, to QCD. While the ultimate goal is to apply these matching conditions non-perturbatively, in this study we first have implemented them at tree-level, in order to find good choices of the matching observables with small \mathcal Oleft(1left mathrm h2 \right. \right) contributions. They can later be employed in the non-perturbative matching procedure which is a crucial part of precision HQET computations of semileptonic decay form factors in lattice QCD. [Figure not available: see fulltext.] © 2014 The Author(s).