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Mass definition in heavy quark effective theory and a new determination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="italic">V</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">c</mml:mi><mml:mi mathvariant="italic">b</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>
Positive powers of the mass parameter in a physical quantity calculated with the help of heavy quark effective theory originate from a Wilson coefficient in the matching of QCD and HQET Green function. We show that this mass parameter enters the calculation as a well--defined running current mass. We further …