Massive c-quark contributions to semileptonic b-quark decay near threshold
Abstract
The decay width of b to c,c,c,l,nu has been computed as an expansion in limit (1- 3*(mc/mb)) << 1 with zero lepton invariant mass. Considering O(alphas2) corrections to b to c,l,nu with zero invariant lepton mass, inclusion of our result is shown to rectify the disagreement between the expansions around (1-(mc/mb)) << 1 and mc/mb << 1 at smaller values.
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