Electroweak one-loop contributions to top pair production in hadron colliders

We give a detailed presentation of the electroweak one-loop contributions to the production mechanisms of top quark pairs, qq → tt and gg → tt, for the energy range of future hadron colliders. The full gauge-invariant set of loop diagrams with Higgs, Z⁰ and W^± bosons is considered including strong Yukawa couplings. The parton cross sections get sizeable modifications up to 40% and are sensitive to the Higgs boson mass and the Yukawa coupling. Results are also given for the observable hadronic cross section pp → ttX, where the large corrections at the parton level are substantially reduced to the order of a few percent. For the electroweak Standard Model the maximum contribution is about 7% for a light Higgs boson with M_η = 60 GeV. For Higgs bosons with M_{η > 200} GeV, the electroweak contributions are typically (2-3)%.