2013/09/30 by André H. Hoang, Andre Hoang, Maximilian Stahlhofen
Physics and Astronomy · #Cross section (physics) #High-Energy Particle Collisions Research #Mathematical physics #Normalization (sociology) #Particle physics #Particle physics theoretical and experimental studies #Perturbation theory (quantum mechanics) #Physics #Quantum Chromodynamics and Particle Interactions #Quantum chromodynamics #Quantum mechanics #Renormalization #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep05(2014)121
published as JHEP 1405 (2014) 121 · 23 pages, 7 figures; v2: plots and appendix added, journal version
openalex publication_date 2014/05/01 · arxiv created 2014/06/03 · arxiv updated 2014/06/05 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We discuss the top-antitop production cross section near threshold at a future linear collider accounting for the NNLL QCD corrections to the anomalous dimension of the leading S-wave production current computed recently within renormalization-group-improved NRQCD perturbation theory. We argue that the still unknown soft NNLL mixing corrections are negligible so that the NNLL QCD corrections to the total cross section can be considered complete for practical purposes. Based on combined variations of the renormalization and matching scales and the overall size of the perturbative corrections we estimate that the NNLL QCD total cross section has a normalization uncertainty of dσ/σ = 5 % at threshold. We present results for the total cross section and also for the experimentally more relevant case, when moderate cuts are imposed on the reconstructed top and antitop invariant masses.