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Higher-order perturbative corrections to b --> c transitions at zero recoil
We estimate the two-loop perturbative corrections to zero-recoil matrix elements of the flavour-changing currents \bar c\,\gamma^\mu b and \bar c\,\gamma^\mu\gamma_5\,b by calculating the terms of order n_f\,\alpha_s^2 and substituting the dependence on the number of flavours by the first coefficien...
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| Lenguaje: | eng |
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1994
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| Acceso en línea: | https://dx.doi.org/10.1016/0370-2693(95)80016-Q http://cds.cern.ch/record/269638 |