The PDF interpretation of the measurement of a W boson produced in association with jets at the ATLAS detector

A QCD analysis using heavy vector boson data from the ATLAS detector at the LHC collected during the 2012 running period at a centre-of-mass energy of 8 TeV, where the boson was pro- duced in association with at least one hadronuc jet is presented. Included in the analysis are ATLAS data on inclusive W and Z boson production data at 7 TeV. The results are presented together with a new fit to the ATLAS inclusive W And Z data alone, performed with an updated parameterisation. The consequences for the strangeness content of the proton are discussed. Sys- tematic correlations between the input ATLAS data sets are fully accounted. The resulting PDF set is called ATLASepWZWjets19.