$O({\alpha }_s^2)$ corrections to fully-differential top quark decays

Abstract

We describe a calculation of the fully-differential decay rate of a top quark to a massless $b$-quark and a lepton pair at next-to-next-to-leading order in perturbative QCD. Technical details of the calculation are discussed and selected results for kinematic distributions are shown.

Comments: 26 pages, 2 figures. v2: Fig. 2 replaced, references added, minor typos corrected. Version published in JHEP