Jet-veto resummation at N3LLp + NNLO in boson production processes

A bstract

Vetoing energetic jet activity is a crucial tool for suppressing backgrounds and enabling new physics searches at the LHC, but the introduction of a veto scale can introduce large logarithms that may need to be resummed. We present an implementation of jet-veto resummation for color-singlet processes at the level of N ³LL _p matched to fixed-order NNLO predictions. Our public code MCFM allows for predictions of a single boson, such as Z/γ ^*, W ^± or H, or with a pair of vector bosons, such as W ⁺ W ⁻ , W ^± Z or ZZ. The implementation relies on recent calculations of the soft and beam functions in the presence of a jet veto over all rapidities, with jets defined using a sequential recombination algorithm with jet radius R. However one of the ingredients that is required to reach full N ³LL accuracy is only known approximately, hence N ³LL _p. We describe in detail our formalism and compare with previous public codes that operate at the level of NNLL. Our higher-order predictions improve significantly upon NNLL calculations by reducing theoretical uncertainties. We demonstrate this by comparing our predictions with ATLAS and CMS results.