Decoupling of heavy quarks in HQET
Abstract
Decoupling of c-quark loops in b-quark HQET is considered. The decoupling coefficients for the HQET heavy-quark field and the heavy-light quark current are calculated with the three-loop accuracy. The last result can be used to improve the accuracy of extracting f_B from HQET lattice simulations (without c-quark loops). The decoupling coefficient for the flavour-nonsinglet QCD current with n antisymmetrized gamma-matrices is also obtained at three loops; the result for the tensor current (n=2) is new.
Cite
@article{arxiv.hep-ph/0609280,
title = {Decoupling of heavy quarks in HQET},
author = {A. G. Grozin and A. V. Smirnov and V. A. Smirnov},
journal= {arXiv preprint arXiv:hep-ph/0609280},
year = {2009}
}
Comments
JHEP3 documentclass; the results in a computer-readable form can be found at http://www-ttp.physik.uni-karlsruhe.de/Progdata/ttp06/ttp06-25/ V2: a few typos corrected, a few minor text improvements, a few references added; V3: several typos in formulas fixed