Matching QCD and HQET heavy-light currents at three loops
S. Bekavac, A.G. Grozin, P. Marquard, J.H. Piclum, D. Seidel, M., Steinhauser
TL;DR
This paper computes three-loop corrections for matching heavy-light currents between QCD and HQET, providing precise perturbative results relevant for B-meson decay constants.
Contribution
It presents the first three-loop calculation of the matching between QCD and HQET heavy-light currents, advancing theoretical precision.
Findings
Third-order perturbative corrections to B-meson decay constant ratios
Enhanced accuracy in heavy-light current matching
Improved theoretical tools for flavor physics
Abstract
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.
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