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 Collide r (LHC). We have calculated the QCD corrections to these processes in the s tandard model at next-to-leading order. The higher-order corrections reduce the renormalization and factorization scale dependence considerably and st abilize the theoretical predictions for the cross sections. At the central scale mu = (2m(t) + M-H)/2 the properly defined K factors are slightly belo w unity for the Tevatron (K similar to 0.8) and slightly above unity for th e LHC (K similar to 1.2).