Decoupling of heavy quarks in HQET - INSPIRE

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Decoupling of heavy quarks in HQET

Andrey G. Grozin
(
- Karlsruhe U.
)
,
Alexander V. Smirnov
(
- Moscow State U.
)
,
Vladimir A. Smirnov
(
- SINP, Moscow
)

Sep, 2006

25 pages

Published in:

JHEP 11 (2006) 022

e-Print:

hep-ph/0609280 [hep-ph]

DOI:

10.1088/1126-6708/2006/11/022

Report number:

TTP06-25,
SFB-CPP-06-46

View in:

ADS Abstract Service

reference search29 citations

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Abstract: (arXiv)

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.

QCD
NLO computations
heavy quark physics
HQET model
heavy quark
quark: decoupling
quark: current
Feynman graph: higher-order
quantum chromodynamics
renormalization: on-shell

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