QCD corrections to t\bar t b \bar b productions via photon-photon collisions at linear colliders

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dc.creatorLei, Guo
dc.creatorWen-Gan, Ma
dc.creatorLiang, Han
dc.creatorRen-You, Zhang
dc.creatorYi, Jiang
dc.date2007-08-22
dc.date2007-09-28
dc.date.accessioned2026-07-07T09:32:24Z
dc.date.available2026-07-07T09:32:24Z
dc.descriptionWe calculated the complete next-to-leading order(NLO) QCD corrections to the $t\bar t b \bar b$ production process at a $γγ$ 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 $μ$. 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 $γγ\to t\bar t b\bar b$ on the renormalization scale.
dc.description14pages, 9figures, to be appeared in Physics Letters B
dc.identifierhttps://arxiv.org/abs/0708.2951
dc.identifierhttp://arxiv.org/abs/0708.2951
dc.identifierPhys. Lett. B654 (2007) 13-19
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158765
dc.subjectHigh Energy Physics - Phenomenology
dc.titleQCD corrections to t\bar t b \bar b productions via photon-photon collisions at linear colliders
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