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We determine the dominant missing Standard Model (SM) contribution to the topquark pair forward-backward asymmetry at the Tevatron. Contrary to pastexpectations, we find a large, around 27%, shift relative to the well-knownvalue of the inclusive asymmetry in next-to-leading order (NLO) QCD. Combiningall known Standard Model corrections, we find that AFB^{SM} = 0.095 +- 0.007.This value is in agreement with the latest D0 measurement [V. M. Abazov et al.(D0 Collaboration), Phys. Rev. D 90, 072011 (2014)] AFB^{D0} = 0.106+- 0.03 andabout 1.5 sigma below that of CDF [T. Aaltonen et al. (CDF Collaboration),Phys. Rev. D 87, 092002 (2013)] AFB^{CDF} =0.164 +- 0.047. Our result isderived from a fully differential calculation of the next-to-next-to leadingorder (NNLO) QCD corrections to inclusive top pair production at hadroncolliders and includes - without any approximation - all partonic channelscontributing to this process. This is the first complete fully differentialcalculation in NNLO QCD of a two-to-two scattering process with all colouredpartons.

Resolving the Tevatron Top Quark Forward-Backward Asymmetry Puzzle: Fully Differential Next-to-Next-to-Leading-Order Calculation