Cancellation of power enhancements in non-spectator decays
U. Aglietti
Abstract
Exclusive non-spectator decay rates of beauty hadrons contain power enhancements of the form (mb/m)2 and mb/m, where mb is the b-quark mass and m is a light quark mass. An implicit argument has been recently given according to which these singularities cancel in the totally inclusive decay width. We present in this note a completely explicit computation of the diagrams containing power enhancements. Our results agree with the previous general conclusion.
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