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| + | ====== TTP97-04 HQET chromomagnetic interaction at two loops ====== | ||
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| + | < | ||
| + | the only unknown coefficient in the Heavy Quark Effective Theory | ||
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| + | 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. | ||
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| + | </ | ||
| + | |**Andrzej Czarnecki and Andrey Grozin** | ||
| + | |** Phys. Lett. B405 142 1997 ** | | ||
| + | | {{preprints: | ||
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