Giant QCD K-factors beyond NLO
Jun, 2010Citations per year
Abstract: (arXiv)
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.Note:
- 38 pages, 13 figures; v2 includes additional references
- NLO Computations
- Hadronic Colliders
- QCD
- jet: pair production
- quantum chromodynamics
- CERN LHC Coll
- p p: inclusive reaction
- jet: hadroproduction
- Z0: associated production
- Drell-Yan process
References(53)
Figures(46)