论文标题
半leptonic \ boldmath {$ b \ to c $}的三阶校正和muon衰变
Third order corrections to the semi-leptonic \boldmath{$b\to c$} and the muon decays
论文作者
论文摘要
我们考虑到巨大的魅力夸克，计算decay $ b \ to decay $ b \ decay $ b \ bar的订单$α_s^3 $的更正。在壳方案中，发现了大型三环校正。但是，在动力学方案中，三环校正低于1 \％，因此扰动理论得到了很好的控制。此外，我们还为$α_s^3 $校正订单提供了结果，至u \ ell \barν$以及对MUON衰减的三阶Q校正，这对于减少Fermi耦合常数$ G_F $的不确定性非常重要。
We compute corrections of order $α_s^3$ to the decay $b \to c \ell \barν$ taking into account massive charm quarks. In the on-shell scheme large three-loop corrections are found. However, in the kinetic scheme the three-loop corrections are below 1\% and thus perturbation theory is well under control. We furthermore provide results for the order $α_s^3$ corrections to $b \to u \ell \barν$ and the third-order QED corrections to the muon decay which will be important input for reducing the uncertainty of the Fermi coupling constant $G_F$.
