Non-local slicing approaches for NNLO QCD in MCFM

Abstract

Abstract We present the implementation of several processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD in the parton-level Monte Carlo program MCFM. The processes treated are pp → H, W±, Z, W±H, ZH, W±γ, Zγ and γγ and, for the first time in the code, W+W−, W±Z and ZZ. Decays of the unstable bosons are fully included, resulting in a flexible fully differential Monte Carlo code. The NNLO corrections have been calculated using two non-local slicing approaches, isolating the doubly unresolved region by cutting on the zero-jettiness, $$ \mathcal{T} $$ T 0, or on qT, the transverse momentum of the colour singlet final-state particles. We find that for most, but not all processes the qT slicing method leads to smaller power corrections for equal computational burden.