Top quark pair production at NNLO in the quark-antiquark channel

Abelof, Gabriel and Ridder, Aude Gehrmann-De and Májer, Imre (2015) Top quark pair production at NNLO in the quark-antiquark channel. JOURNAL OF HIGH ENERGY PHYSICS (12). ISSN 1126-6708

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Abstract

We present the derivation of the NNLO two-parton final state contributions to top pair production in the quark-antiquark channel proportionnal to the leading colour factor N 2 c . Together with the three and four-parton NNLO contributions presented in a previous publication, this enables us to complete the phenomenologically most important NNLO corrections to top pair hadro-production in this channel. We derive this two-parton contribution using the massive extension of the NNLO antenna subtraction formalism and implement those corrections in a parton-level event generator providing full kinematical information on all final state particles. In addition, we also derive the heavy quark con- tributions proportional to Nh. Combining the new leading-colour and heavy quark contri- butions together with the light quark contributions derived previously, we present NNLO differential distributions for LHC and Tevatron. We also compute the differential top quark forward-backward asymmetry at Tevatron and find that our results are in good agreement with the measurements by the D0 collaboration.

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