\midheading{Single-top-quark production and decay at NNLO, process 1650} \label{subsec:stop} \label{single-top-quark-production-and-decay-at-nnlo} This calculation is based on ref.~\cite{Campbell:2020fhf}. This process constitutes the real correction needed for the complete NNLO order calculation. In other words it is the plus-one-jet process evaluated at NLO.