HQET at order 1/m: I. Non-perturbative parameters in the quenched approximation

ALPHA Collaboration, Benoit Blossier, Michele Della Morte, Nicolas Garron, Rainer Sommer

Research output: Contribution to journalArticlepeer-review

Abstract

We determine non-perturbatively the parameters of the lattice HQET Lagrangian and those of the time component of the heavy-light axial-vector current in the quenched approximation. The HQET expansion includes terms of order 1/m(b). Our results allow to compute, for example, the heavy-light spectrum and B-meson decay constants in the static approximation and to order 1/m(b) in HQET. The determination of the parameters is separated into universal and non-universal parts. The universal results can be used to determine the parameters for various discretizations. The computation reported in this paper uses the plaquette gauge action and the "HYP1/2" action for the b-quark described by HQET. The parameters of the current also depend on the light-quark action, for which we choose non-perturbatively O(a)-improved Wilson fermions.

Original languageEnglish
Article number002
Pages (from-to)-
Number of pages29
JournalJournal of High Energy Physics
Issue number6
DOIs
Publication statusPublished - Jun 2010

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