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

The ATLAS collaboration
JHEP 02 (2017) 117, 2017.

Abstract (data abstract)
CERN-LHC, ATLAS. 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.

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