HQET chromomagnetic interaction at two loops

Czarnecki, A.; Grozin, A.G.

doi:10.1016/S0370-2693(97)00587-X

HQET chromomagnetic interaction at two loops

A. Czarnecki
(
- Karlsruhe U., TTP
)
,
A.G. Grozin
(
- Novosibirsk, IYF
)

Jan, 1997

9 pages

Published in:

Phys.Lett.B 405 (1997) 142-149,
Phys.Lett.B 650 (2007) 447 (erratum)

e-Print:

hep-ph/9701415 [hep-ph]

DOI:

Report number:

TTP-97-04,
BUDKER-INP-1997-2

View in:

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Abstract:

We obtain the coefficient of the chromomagnetic-interaction operator, the only unknown coefficient in the HQET lagrangian up to the 1/m level, with the two-loop accuracy by matching scattering amplitudes of an on-shell heavy quark in an external field in QCD and HQET. From its \mu-dependence, we obtain the two-loop anomalous dimension of this operator in HQET.

Note:

9 pages, LaTeX2e, 2 eps figures included Report-no: TTP 97-04, Budker INP 97-2

HQET model
quantum chromodynamics
perturbation theory: higher-order
quark: on-shell
scattering amplitude

References(21)

Figures(0)

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