Higgs radiation off top quarks at the Tevatron and the LHC -: art. no. 201805

Higgs bosons can be searched for in the channels p (p) over bar /pp --> t (t) over barH + X at the Fermilab Tevatron and the Cern Large Hadron Collider (LHC). We have calculated the QCD corrections to these processes in the standard model at next-to-leading order. The higher-order corrections reduce the renormalization and factorization scale dependence considerably and stabilize the theoretical predictions for the cross sections. At the central scale mu = (2m(t) + M-H)/2 the properly defined K factors are slightly below unity for the Tevatron (K similar to 0.8) and slightly above unity for the LHC (K similar to 1.2).