Heavy-to-light decays with a two-loop accuracy
Abstract
We present a determination of a new class of three-loop Feynman diagrams describing heavy-to-light transitions. We apply it to find the O(alphas2) corrections to the top quark decay t -> bW and to the distribution of lepton invariant mass in the semileptonic b quark decay b -> ul. We also confirm the previously determined total rate of that process as well as the O(alpha2) corrections to the muon lifetime.
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