O(αs) QCD and O(αew) electroweak corrections to tt̄h0 production in γγ collision Original Research Article

We calculate the O(αs) QCD and O(αew) electroweak one-loop corrections in the Standard Model framework, to the production of an intermediate Higgs boson associated with tt̄ pair via γγ fusion at an electron–positron linear collider (LC). We find the O(αs) QCD corrections can be larger than the O(αew) electroweak ones, with the variations of the Higgs boson mass mh and e+e− colliding energy s. Both corrections may significantly decrease or increase the Born cross section. The numerical results show that the relative corrections from QCD to the process e+e−→γγ→tt̄h0 may reach 34.8%, when s=800 GeV and mh=200 GeV, while those from electroweak can be −13.1, −15.8 and −12.0%, at s=800 GeV, 1 TeV and 2 TeV, respectively.