Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-08-22
Phys. Lett. B654 (2007) 13-19
Physics
High Energy Physics
High Energy Physics - Phenomenology
14pages, 9figures, to be appeared in Physics Letters B
Scientific paper
We calculated the complete next-to-leading order(NLO) QCD corrections to the $t\bar t b \bar b$ production process at a $\gamma \gamma$ collider in the standard model(SM). The calculation of the one-loop QCD correction includes the evaluations of the hexagon and pentagon amplitudes. We studied the NLO QCD corrected total cross section, the distributions of transverse momenta of final top- and bottom-quark states, and the dependence of the cross section on renormalization scale $\mu$. It shows that NLO QCD correction generally increases the LO cross section in our chosen parameter space, and the K-factor varies from 1.70 to 1.14 when colliding energy goes up from $400 GeV$ to $2 TeV$. We find that the correction distinctly changes the distributions of transverse momenta of the final top- and bottom-quark states, and the NLO QCD correction obviously improves the independence of the cross section for process $\gamma\gamma \to t\bar t b\bar b$ on the renormalization scale.
Lei Guo
Liang Han
Ren-You Zhang
Wen-gan Ma
Yi Jiang
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