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T: Fachverband Teilchenphysik

T 18: Top Quark (Theorie) 1

T 18.3: Vortrag

Montag, 27. März 2017, 17:15–17:30, VSH 05

Top-quark pair production at next-to-next-to-leading order QCD in electron positron collisions — •Long Chen — Institut f. Theoretische Teilchenphysik u. Kosmologie, RWTH Aachen

We set up a formalism, within the antenna subtraction framework, for computing the production of a massive quark-antiquark pair in electron positron collisions at next-to-next-to-leading order in the coupling α_s of quantum chromodynamics at the differential level. Our formalism applies to the calculation of any infrared-safe observable. We apply this set-up to the production of top-quark top antiquark pairs in the continuum. We compute the production cross section and several distributions. We determine, in particular, the top-quark forward-backward asymmetry at order α_s². Our result agrees with previous computations of this observable.