Author:
,Hesse Dirk,Sommer Rainer
Abstract
Abstract
Heavy Quark Effective Theory (HQET) computations of semi-leptonic decays, e.g. B → πlν, require the knowledge of the parameters in the effective theory for all components of the heavy-light flavor currents. So far non-perturbative matching conditions have been employed only for the time component of the axial current. Here we perform a check of matching conditions for the time component of the vector current and the spatial component of the axial vector current up to one-loop order of perturbation theory and to lowest order of the 1/m-expansion. We find that the proposed observables have small higher order terms in the 1/m-series and are thus excellent candidates for a non-perturbative matching procedure.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
Reference36 articles.
1. ALPHA collaboration, J. Heitger and R. Sommer, Nonperturbative heavy quark effective theory, JHEP
02 (2004) 022 [hep-lat/0310035] [INSPIRE].
2. B. Blossier, M. della Morte, N. Garron and R. Sommer, HQET at order 1/m: I. Non-perturbative parameters in the quenched approximation, JHEP
06 (2010) 002 [arXiv:1001.4783] [INSPIRE].
3. ALPHA collaboration, B. Blossier et al., HQET at order 1/m: II. Spectroscopy in the quenched approximation, JHEP
05 (2010) 074 [arXiv:1004.2661] [INSPIRE].
4. ALPHA collaboration, B. Blossier et al., HQET at order 1/m: III. Decay constants in the quenched approximation, JHEP
12 (2010) 039 [arXiv:1006.5816] [INSPIRE].
5. M. Della Morte, P. Fritzsch and J. Heitger, Non-perturbative renormalization of the static axial current in two-flavour QCD, JHEP
02 (2007) 079 [hep-lat/0611036] [INSPIRE].
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