Complete ${\cal O}(\alpha_{s})$ QCD and ${\cal O}(\alpha_{ew})$ electroweak corrections to $t\bar{t}h^0$ production in $\gamma \gamma$ collision
Hui Chen, Ma Wen-Gan, Zhang Ren-You, Zhou Pei-Jun, Hou Hong-Sheng, Yan-Bin Sun · arXiv (Cornell University) · 2003
We calculate the full ${\\cal O}(\\alpha_{s})$ QCD and ${\\cal O}(\\alpha_{{\\rm ew}})$ electroweak radiative corrections to the productions of a Higgs boson in intermediate mass region associated with $t\\bar{t}$ pair in $\\gamma \\gamma$ collisions at an electron-positron linear collider (LC) in the standard model. We find the ${\\cal O}(\\alpha_{s})$ QCD corrections can be larger than the ${\\cal O}(\\alpha_{{\\rm ew}})$ corrections depending on the Higgs boson mass $m_{h}$ and $e^+e^-$ colliding energy $\\sqrt{s}$. Both kinds of corrections may significantly decrease or increase the Born cross sections. The numerical results show that the ${\\cal O}(\\alpha_{s})$ QCD relative corrections to the process \\eep can reach 34.8% when $\\sqrt{s}=800$ GeV and $m_h=200$ GeV, while the ${\\cal O}(\\alpha_{{\\rm ew}})$ electroweak relative corrections to the Born cross sections can reach -13.1%, -15.8% and -12.0% at $\\sqrt{s} = 800$ GeV, 1 TeV and 2 TeV, respectively.