Heavy-to-light-quark decays with two-loop accuracy.

@article{Blokland2004HeavytolightquarkDW,
  title={Heavy-to-light-quark decays with two-loop accuracy.},
  author={I. Blokland and A. Czarnecki and M. Ślusarczyk and F. Tkachov},
  journal={Physical review letters},
  year={2004},
  volume={93 6},
  pages={
          062001
        }
}
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(alpha2(s)) corrections to the top quark decay t --> bW and to the distribution of lepton invariant mass in the semileptonic b quark decay b --> ulnu. We also confirm the previously determined total rate of that process as well as the O(alpha2) corrections to the muon lifetime. 
Extracting the Top-Quark Width from Nonresonant Production.
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