Heavy-to-light-quark decays with two-loop accuracy.
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.
Blokland
Ian
I
Department of Physics, University of Alberta, Edmonton, AB T6G 2J1, Canada.
Czarnecki
Andrzej
A
Slusarczyk
Maciej
M
Tkachov
Fyodor
F