NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels

By Michal Czakon, Alexander Mitov. 2012

752 citations recorded by the source corpus.

A bstractThis is a second paper in our ongoing calculation of the next-to-next-to-leading order (NNLO) QCD correction to the total inclusive top-pair production cross-section at hadron colliders. In this paper we calculate the reaction $ q\overline{q}\to t\overline{t}+q\overline{q} $ which was not considered in our previous work on $ q\overline{q}\to t\overline{t}+X $ [1] due to its phenomenologically negligible size. We also calculate all remaining fermion-pair-initiated partonic channels $ q{q^{\prime }} $, $ q{{\overline{q}}^{\prime }} $ and qq that contribute to top-pair production starting from NNLO. The contributions of these reactions to the total cross-section for top-pair production at the Tevatron and LHC are small, at the permil level. The most interesting feature of these reactions is their characteristic logarithmic rise in the high energy limit. We compute the constant term in the leading power behavior in this limit, and achieve precision that is an order of magnitude better than the precision of a recent theoretical prediction for this constant. All four partonic reactions computed in this paper are included in our numerical program Top++. The calculation of the NNLO corrections to the two remaining partonic reactions, $ qg\to t\overline{t}+X $ and $ gg\to t\overline{t}+X $, is ongoing.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/6bc29f800678947ad903b5e9fa94a0097094a5b3

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In Nuclear and High Energy Physics

Citations in the corpus

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.”
Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector (2015, positive): “tt̄ Powheg + Pythia8 253† NNLO+NNLL [89–94]”
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.”
Parton distribution benchmarking with LHC data (2012, result): “Theoretical progress towards the full NNLO result has been made recently [42–47], including the recent calculation of the full NNLO qg initiated contribution [44] (which amounts to a small O(1%) correction, contrary to previous approximate estimates [47]).”
Constraints on the gluon PDF from top quark pair production at hadron colliders (2013, methodology): “The total tt̄ production cross section is an important observable at hadron colliders, which has been recently computed in full next-to-next-to leading order (NNLO) QCD [1–4].”
Soft triple-real radiation for Higgs production at N3LO (2013, neutral): “[36–48]”
Higgs boson production in association with a jet at next-to-next-to-leading order in perturbative QCD (2013, methodology): “These results were used to obtain NNLO QCD corrections to the cross-sections for qq̄ → tt̄ [71, 72] and qg → tt̄ [73] processes.”