Next-to-leading order corrections to light-quark mixed QCD-EW contributions to Higgs boson production

We present for the first time the exact next-to-leading-order QCD corrections to the light-quark part of the mixed QCD-EW contributions to Higgs production via gluon fusion at the Large Hadron Collider, for a center-of-mass energy of 13 TeV, with exact EW-boson mass dependence. The relevant two-loop real-emission matrix element is computed using a dynamic one-dimensional series expansion strategy whose stability and speed allows for a numerical phase-space integration using local IR subtraction counterterms. For the choice of renormalization (mu(R)) and factorization (mu(F)) scales, mu(R) = mu(F )= M-H, we find sigma((alpha s2 alpha 2+alpha s3 alpha 2))(gg -> H+X) = 1.467(2)(-14.6%)(+18.7%) (mu(R) var) +/- 2% (PDF) pb, which we use to provide the best result, including an estimate of suppressed contributions: sigma((EW,best))(pp -> H+X) = 2.11 +/- 0.28 (theory) pb.