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Giant QCD K-factors beyond NLO

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arxiv 1006.2144 v2 pith:MPI6ONWX submitted 2010-06-10 hep-ph

Mathieu Rubin , Gavin P. Salam , Sebastian Sapeta This is my paper
classification hep-ph
keywords observablesresultsk-factorsmethodnnloapproximatecaseseven
verification ladder T0 review T1 audit T2 compute T3 formal
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Hadronic observables in Z+jet events can be subject to large NLO corrections at 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 be obtained for such observables, supplementing NLO Z+jet and NLO Z+2-jet results with a unitarity-based approximation for missing higher loop terms. We first test the method against known NNLO results for Drell-Yan lepton pt spectra. We then show our approximate NNLO results for the Z+jet observables. Finally we examine whether the LoopSim method can provide useful information even in cases without giant K-factors, with results for observables in dijet events that can be compared to early LHC data.

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Cited by 5 Pith papers

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