Measurements of top-quark pair to Z-boson cross-section ratios at √s = 13, 8, 7TeV with the ATLAS detector

Abstract

Measurements of the fiducial and total cross sections for Z production using the electron and muon final states in proton-proton collisions at a centre-of-mass energy of 13 TeV with 3.2 fb^-1 of data collected in 2015. Measurements of single and double fiducial and total cross-section ratios for ttbar and Z production at 13, 8, and 7TeV.