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 — preprints:1997:ttp97-04 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP97-04 HQET chromomagnetic interaction at two loops  ====== + + + We present the coefficient of the chromomagnetic interaction operator, + the only unknown coefficient in the Heavy Quark Effective Theory + (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 full QCD and HQET, + and obtain the two--loop anomalous dimension of this operator in HQET. + + + |**Andrzej Czarnecki and Andrey Grozin**  | + |** Phys. Lett. B405 142 1997  **  | + | {{preprints:1997:ttp97-04.pdf|PDF}} {{preprints:1997:ttp97-04.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9701415|arXiv]]   | + | |