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We present the NNLO corrections to top pair production in the quark-antiquarkchannel proportional to the number of light quark flavors $N_l$. While thedouble real corrections were derived previously, here we compute thereal-virtual and virtual-virtual contributions in this partonic channel. Usingthe antenna subtraction formalism, we show that the subtraction terms correctlyapproximate the real-virtual contributions in all their infrared limits.Combined with the integrated forms of the double real and real-virtualsubtraction terms, we show analytically that the explicit infrared poles cancelat the real-virtual and virtual-virtual levels respectively, therebydemonstrating the validity of the massive extension of the NNLO antennaformalism. These NNLO corrections are implemented in a Monte Carlo parton levelgenerator providing full kinematical information on an event-by event basis.With this program, NNLO differential distributions in the form of binnedhistograms are obtained and presented here.

Light fermionic NNLO QCD corrections to top-antitop production in the quark-antiquark channel