Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation

By Matteo Cacciari, Michal Czakon, M. Mangano, Alexander Mitov, P. Nason. 2011

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Incorporating all recent theoretical advances, we resum soft-gluon corrections to the total tcross-section at hadron colliders at the next-to-next-to-leading logarithmic (NNLL) order. We perform the resummation in the well established framework of Mellin N-space resummation. We exhaustively study the sources of systematic uncertainty like renormalization and factorization scale variation, power suppressed effects and missing two- and higher-loop corrections. The inclusion of soft-gluon resummation at NNLL brings only a minor decrease in the perturbative uncertainty with respect to the NLL approximation, and a small shift in the central value, consistent with the quoted uncertainties. These numerical predictions agree with the currently available measurements from the Tevatron and LHC and have uncertainty of similar size. We conclude that significant improvements in the tcross-sections can potentially be expected only upon inclusion of the complete NNLO corrections.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b71d918ce03b9ff0368e6753e9b76bd6b432477f

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In Nuclear and High Energy Physics

Citations in the corpus

Constraints on the gluon PDF from top quark pair production at hadron colliders (2013, background): “Thanks to a much improved control over higher order terms, including soft gluon emissions through next-to-next-to leading log (NNLL) [5–7], scale uncertainties are now controlled down to the 2.”
Measurement of the t-channel single-top-quarkproduction cross section and of the |Vtb| CKM matrixelement in pp collisions at √s = 8 TeV (2014, background): “• Background normalisation: An uncertainty in the tt normalisation of ±10% is considered, covering the difference between theoretical predictions in [7] and [32].”
The measurement of the Higgs self-coupling at the LHC: theoretical status (2012, neutral): “K-factors for gg → HH, bb̄τ τ̄ [123], tt̄ [124–136] and ZH production [77] at √s = 14TeV.”
Searches for electroweak production of supersymmetric particles with compressed mass spectra in √s = 13 TeV pp collisions with the ATLAS detector (2019, neutral): “3 LO NNLO+NNLL [88–92] t (s-channel) Powheg-Box Pythia 8.”
Top-pair production at the LHC through NNLO QCD and NLO EW (2017, background): “1 Introduction The availability of NNLO QCD predictions for stable top-pair production at the LHC, both for the total cross-section [1–4] with NNLL soft-gluon resummation [5, 6] and for all the main differential distributions [7, 8], has made it possible to compare Standard Model (SM) theory with LH”
Search for supersymmetry in proton-proton collisions at 13 TeV in final states with jets and missing transverse momentum (2019, methodology): “Normalization of the simulated background samples is performed using the most accurate cross section calculations available [55, 61, 62, 64–72], which generally correspond to NLO or next-to-NLO (NNLO) precision.”