Decoupling of heavy quarks in HQET

Details Decoupling of heavy quarks in HQET Decoupling of heavy quarks in HQET

2006-09-27

arxiv.org/abs/hep-ph/0609280v3

JHEP0611:022,2006

Physics

High Energy Physics

High Energy Physics - Phenomenology

JHEP3 documentclass; the results in a computer-readable form can be found at http://www-ttp.physik.uni-karlsruhe.de/Progdata/t

Scientific paper

10.1088/1126-6708/2006/11/022

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.

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