Total top-quark pair-production cross section at hadron colliders through O(αS(4)).

By Michal Czakon, P. Fiedler, Alexander Mitov. Physical Review Letters, 2013

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We compute the next-to-next-to-leading order (NNLO) quantum chromodynamics (QCD) correction to the total cross section for the reaction gg → tt + X. Together with the partonic channels we computed previously, the result derived in this Letter completes the set of NNLO QCD corrections to the total top pair-production cross section at hadron colliders. Supplementing the fixed order results with soft-gluon resummation with next-to-next-to-leading logarithmic accuracy, we estimate that the theoretical uncertainty of this observable due to unknown higher order corrections is about 3% at the LHC and 2.2% at the Tevatron. We observe a good agreement between the standard model predictions and the available experimental measurements. The very high theoretical precision of this observable allows a new level of scrutiny in parton distribution functions and new physics searches.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/a912ee22100909d7c2ea7ef4cd2328257e7d8c66

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Citations in the corpus

The PDF4LHC report on PDFs and LHC data: Results from Run I and preparation for Run II (2015, methodology): “While NLO calculations are affected by large scale uncertainties, the completion of the full NNLO calculation for total production cross-sections [135] and for differential distributions [136, 137] will allow for consistent use of the top quark-pair data in the fits at NNLO.”
Fully covering the MSSM Higgs sector at the LHC (2015, methodology): “This value for the cross section is obtained at NNLO in QCD including the resummation of next-to-next-to-leading logarithmic (NNLL) soft gluon terms and it turns out that it is only 3% larger than the value of the cross section when evaluated at NNLO [81].”
Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at $\sqrt{s}=8$ TeV with the ATLAS detector (2015, neutral): “1 NNLO [66, 67] NLO CT10 Sherpa default tt̄ powheg-box r2129 NNLO+NNLL NLO CT10 Perugia2011C [69–71] [72, 73] [74] Single-top (t-channel) AcerMC 3.”
Higgs boson pair production in the D = 6 extension of the SM (2014, methodology): “The total cross section for tt̄ was normalised to σtt̄ = 900 pb [113, 114] and the ZZ and hZ NLO cross sections were taken out of the aMC@NLO calculation directly: σZZ = 15.”