Measurement of associated production of W bosons with charm quarks in proton-proton collisions at $\sqrt{s}=13~\mathrm{TeV}$ with the CMS experiment at the LHC

Measurements are presented of the associated production of a W boson and a charm quark (W+c) in proton-proton collisions at a center-of-mass energy of 13 TeV. The data correspond to an integrated luminosity of 35.7 $\mathrm{fb}^{-1}$, collected by the CMS experiment at the LHC. The W bosons are identified by their decays into a muon and a neutrino. The charm quarks are tagged through the full reconstruction of $D^*(2010)^{\pm}$ mesons in their decays $D^*(2010)^{\pm} \to D^0 + \pi^{\pm}_{slow} \to K^{\mp} + \pi^{\pm} + \pi^{\pm}_{slow}$. The measurements are performed for the transverse momentum of the muon from the W boson decay greater than 26 GeV in the pseudorapidity range $|\eta^{\mu}| < 2.4$ and for transverse momentum of the charm quark greater than 5 GeV. The total cross section of $\sigma$(W+c) = 1026 $\pm$ 31 (stat) $\substack{+76\\-72}$ (syst) pb is obtained. The cross section is also measured differentially with respect to the absolute value of the pseudorapidity of the muon from the W boson decay. Results are compared with theoretical predictions and are used to probe the strange quark content of the proton.