We consider the currents formed by a heavy and a light quark within Quantum Chromodynamics and compute the matching to Heavy Quark Effective Theory to three-loop accuracy. As an application we obtain the third-order perturbative corrections to ratios of B-meson decay constants.
@article{arxiv.0911.3356,
title = {Matching QCD and HQET heavy-light currents at three loops},
author = {S. Bekavac and A. G. Grozin and P. Marquard and J. H. Piclum and D. Seidel and M. Steinhauser},
journal= {arXiv preprint arXiv:0911.3356},
year = {2010}
}
Comments
23 pages, full results are available as Mathematica files at http://www-ttp.particle.uni-karlsruhe.de/Progdata/ttp09/ttp09-41/ ; v2: an error in comparison with Ref. [8] fixed ; v3: Journal version