All three-loop four-point massless integrals with one off-shell leg

Abstract: We present the complete set of massless three-loop four-point master integrals with one off-shell external leg. These are essential building blocks for the three-loop virtual corrections to Higgs-boson or vector-boson production in association with a jet at the Large Hadron Collider, required for next-to-next-to-next-to-leading-order QCD predictions. We construct a complete basis of canonical integrals by identifying integrands with simple poles and unit leading singularities, solely by integrand analysis. This includes an integral family with 371 master integrals and a 19-dimensional top sector. The solutions for all relevant integrals are provided as a map to a minimal set of iterated integrals graded according to their analytic properties, together with high-precision series expansions.