The measurement the of W+c production cross-section provides an
opportunity to directly access the strange quark content of the proton
at the electroweak scale.
We focus on W → lν and c → D * as probes of W+c since both, W-
boson and D-Meson, can be measured with good accuracy by the CMS-
detector. Further the fragmentation of charm quarks into D-mesons is
well measured. The data taken by the CMS-experiment at the LHC
in 2016 offers sufficient statistics for an analysis of the pseudorapidity-
distribution of the muon coming from the decay of the W-boson. We
present the results for the inclusive and differential cross section of
W+charm, as well as comparisons to theoretical predictions at Next-
to-Leading order (NLO).
The results from this analysis are used as input for a QCD analysis
at NLO to determine the strange-quark distribution and extract the
strangeness fraction of the proton.