Abstract
We present the NNLO corrections to top pair production in the quark-antiquark channel proportional to the number of light quark flavors N l . While the double real corrections were derived previously, here we compute the real-virtual and virtual-virtual contributions in this partonic channel. Using the antenna subtraction formalism, we show that the subtraction terms correctly approximate the real-virtual contributions in all their infrared limits. Combined with the integrated forms of the double real and real-virtual subtraction terms, we show analytically that the explicit infrared poles cancel at the real-virtual and virtual-virtual levels respectively, thereby demonstrating the validity of the massive extension of the NNLO antenna formalism. These NNLO corrections are implemented in a Monte Carlo parton level generator providing full kinematical information on an event-by event basis. With this program, NNLO differential distributions in the form of binned histograms are obtained and presented here.
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Abelof, G., Ridder, A.GD. Light fermionic NNLO QCD corrections to top-antitop production in the quark-antiquark channel. J. High Energ. Phys. 2014, 76 (2014). https://doi.org/10.1007/JHEP12(2014)076
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DOI: https://doi.org/10.1007/JHEP12(2014)076