ZZ production at high transverse momenta beyond NLO QCD

F. Campanario, M. Rauch & S. Sapeta
We study the production of the four-lepton final state ℓ+ℓ−ℓ+ℓ−, predominantly produced by a pair of electroweak Z bosons, ZZ. Using the LoopSim method, we merge NLO QCD results for ZZ and ZZ+jet and obtain approximate NNLO predictions for ZZ production. The exact gluon-fusion loop-squared contribution to the ZZ process is also included. On top of that, we add to our merged sample the gluon-fusion ZZ+jet contributions from the gluon-gluon channel, which is formally of...
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