Paper
Top-Quark Decay at Next-to-Next-to-Leading Order in QCD
Authors
Jun Gao, Chong Sheng Li, Hua Xing Zhu
Abstract
We present the complete calculation of the top-quark decay width at next-to-next-to-leading order in QCD, including next-to-leading electroweak corrections as well as finite bottom quark mass and boson width effects. In particular, we also show the first results of the fully differential decay rates for top-quark semileptonic decay at next-to-next-to-leading order in QCD. Our method is based on the understanding of the invariant mass distribution of the final-state jet in the singular limit from effective field theory. Our result can be used to study arbitrary infrared-safe observables of top-quark decay with the highest perturbative accuracy.