Using 138 inverse femtobarns of 13 TeV proton-proton collisions, CMS measured the W to charm branching fraction ratio as 0.489 ± 0.020, consistent with the Standard Model.
A direct measurement of |Vcs | in hadronic W decays using a charm tag
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Measurement of the W boson decay branching fraction ratio $\mathcal{B}$(W $\to$ cq) / $\mathcal{B}$(W $\to$ $\mathrm{q\bar{q}'}$) in proton-proton collisions at $\sqrt{s}$ = 13 TeV
Using 138 inverse femtobarns of 13 TeV proton-proton collisions, CMS measured the W to charm branching fraction ratio as 0.489 ± 0.020, consistent with the Standard Model.