QCD analysis of ATLAS $W^{\pm}$ boson production data in association with jets

The present note describes the QCD analysis of the ATLAS measurement of $W^{+}$ and $W^{-}$ boson production measurements in association with jets, performed with data from 2012 at a centre-of-mass energy of $8 ~\mathrm{TeV}$. These data are fitted together with ATLAS inclusive $W^{\pm}$ production measurements at $\sqrt{s} = 7~\mathrm{TeV}$ and HERA deep-inelastic scattering data. The parton distribution functions extracted from the resulting fit show an improved determination of the high-$x$ sea-quark densities, while confirming the unsuppressed strange- quark density at lower $x < 0.02$ found by previous ATLAS analyses. This new set of parton distribution functions is presented.