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Abstract: Hadronic observables in Z+jet events can be subject to large NLO correctionsat TeV scales, with K-factors that even reach values of order 50 in some cases.We develop a method, LoopSim, by which approximate NNLO predictions can beobtained for such observables, supplementing NLO Z+jet and NLO Z+2-jet resultswith a unitarity-based approximation for missing higher loop terms. We firsttest the method against known NNLO results for Drell-Yan lepton pt spectra. Wethen show our approximate NNLO results for the Z+jet observables. Finally weexamine whether the LoopSim method can provide useful information even in caseswithout giant K-factors, with results for observables in dijet events that canbe compared to early LHC data.

Autor: Mathieu Rubin, Gavin P. Salam, Sebastian Sapeta


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