Giant QCD K-factors beyond NLO
By M. Rubin, G. Salam, S. Sapeta. 2010
150 citations recorded by the source corpus.
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.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/193298f7ef32f35e91c6e0452efc68a65d34a66e
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In Nuclear and High Energy Physics
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Citations in the corpus
- MINLO: multi-scale improved NLO (2012, background): “Although this case is interesting on its own, being perhaps related to the giant K-factor issues [12], we will not pursue it further in the present work.”
- Jet pair production in POWHEG (2010, background): “tion [35], the problem of large, unphysical NLO corrections in dijet production has also been considered from a different perspective.”
- NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging (2015, background): “3 Giant K-factors and electroweak corrections for V + 1 jet production In this section we start our discussion of V+ jets production at NLO QCD+EW by recalling some pathological features of fixed-order calculations for pp→ V +1 jet.”
- Les Houches 2015: Physics at TeV Colliders Standard Model Working Group Report (2016, methodology): “Also, LOOPSIM’s uncertainty band is relatively wide due to the strong impact of the four-jet contributions on the p⊥(hj1j2) distribution.”
- Physics opportunities of a 100 TeV proton–proton collider (2015, background): “If we ask what is the most likely mechanism to produce gauge bosons in final states with at least one multiTeV jet, it turns out that this is not the LO QCD process where the gauge boson simply recoils against the jet, but the higher-order process where it is a second jet that absorbs the leading je”
- Merging H/W/Z + 0 and 1 jet at NLO with no merging scale: a path to parton shower + NNLO matching (2012, background): “[39] we suggest that this difference arises due to NLO corrections in the ZJ-MiNLO generator which are not present in the Z one, for example those related to threshold logarithms.”
- Electroweak corrections to dilepton + jet production at hadron colliders (2011, unknown): “Moreover, approximate results are available for the NNLO QCD corrections to Z + jet/Z + 2 jets production for observables with especially large K-factors [61].”