Phys. Rev. Lett. 93, 062001 (2004) [4 pages]Heavy-to-Light-Quark Decays with Two-Loop AccuracyReceived 18 March 2004; published 4 August 2004 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(αs2) corrections to the top quark decay t→bW and to the distribution of lepton invariant mass in the semileptonic b quark decay b→ulν. We also confirm the previously determined total rate of that process as well as the O(α2) corrections to the muon lifetime. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.062001
DOI:
10.1103/PhysRevLett.93.062001
PACS:
12.38.Bx, 13.35.Bv, 14.65.Ha
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