DO HIGHER ORDER PERTURBATIVE CORRECTIONS UPSET |Vcb| AND |Vub| DETERMINED FROM SEMILEPTONIC WIDTHS?

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Abstract
It is shown that large perturbative corrections found previously for semileptonic beauty and charm decays are associated with the use of inappropriate pole masses. These pole masses, in the perturbative expansion, suffer from the 1/mQ infrared renormalon which is absent in the widths, leading to similar large corrections in mQ. Pole masses are not measured directly in experiment either. If the widths are related to parameters determined in experiment, the overall impact of the calculated second order corrections becomes strongly suppressed and leads to less than 1% change in |Vcb| and |Vub|. Even in charm decays the perturbative corrections appear to be very moderate in the consistent OPE-compliant treatment. An updated estimate of |Vcb| is given, based on recent accurate determination of mb and αs(1 GeV). The theoretical accuracy of determination of |Vub| from Γsl(b→u) appears to be good as well.

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