QCD corrections to the production of $t\bar{t}γ$ at the ILC

Details QCD corrections to the production of $t\bar{t}γ$ at the ILC QCD corrections to the production of $t\bar{t}γ$ at the ILC

2011-12-16

arxiv.org/abs/1112.3702v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 5 figures, version acceptd by Phys. Lett. B

Scientific paper

A precise calculation of the top quark pair production associated with a hard photon is essential for testing the electroweak property of the top quark in the Standard Model (SM). We investigate the one-loop QCD corrections to the process $e^{+}e^{-} \to t\bar{t}\gamma$ at the International Linear Collider (ILC), and find that the $K$-factor can be as large as 1.238 (1.105, 1.060) for a center-of-mass energy $\sqrt{s}=500 (800, 1500)$ GeV. The transverse momentum distributions of the top quark and photon are respectively shown at leading order (LO) and next-to-leading order(NLO). Due to the asymmetric rapidity distribution of the top (anti-top) quark, we also study the top quark forward-backward asymmetry ($A^{t}_{FB}$) in $t\bar{t}\gamma$ production at NLO, which is found to be 45.82 (55.25, 55.89)% for $\sqrt{s}=500 (800, 1500)$ GeV.

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