Blokland Ian, Czarnecki Andrzej, Slusarczyk Maciej, Tkachov Fyodor
Department of Physics, University of Alberta, Edmonton, AB T6G 2J1, Canada.
Phys Rev Lett. 2004 Aug 6;93(6):062001. doi: 10.1103/PhysRevLett.93.062001. Epub 2004 Aug 4.
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.
我们给出了一类描述重到轻跃迁的新的三圈费曼图的确定结果。我们将其应用于寻找顶夸克衰变(t \to bW)的(O(\alpha_s^2))修正以及半轻子(b)夸克衰变(b \to \mu\nu)中轻子不变质量的分布。我们还证实了先前确定的该过程的总速率以及对μ子寿命的(O(\alpha^2))修正。
