English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

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 thestandard model(SM). The calculation of the one-loop QCD correction includes theevaluations of the hexagon and pentagon amplitudes. We studied the NLO QCDcorrected total cross section, the distributions of transverse momenta of finaltop- and bottom-quark states, and the dependence of the cross section onrenormalization scale $\mu$. It shows that NLO QCD correction generallyincreases the LO cross section in our chosen parameter space, and the K-factorvaries from 1.70 to 1.14 when colliding energy goes up from $400 GeV$ to $2TeV$. We find that the correction distinctly changes the distributions oftransverse momenta of the final top- and bottom-quark states, and the NLO QCDcorrection obviously improves the independence of the cross section for process$\gamma\gamma \to t\bar t b\bar b$ on the renormalization scale.

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