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 Measurement of the Rate of Charm Production in W Decays
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abstract
Using data recorded at centre-of-mass energies around 183 GeV and 189 GeV with the OPAL detector at LEP, the fundamental coupling of the charm quark to the W boson has been studied. The ratio Rc^W = Gamma(W -> cX)/Gamma(W -> hadrons) has been measured from jet properties, lifetime information, and leptons produced in charm decays. A value compatible with the Standard Model expectation of 0.5 is obtained: Rc^W = 0.481 +- 0.042(stat.) +- 0.032(syst.). By combining this result with measurements of the W boson total width and hadronic branching ratio, the magnitude of the CKM matrix element Vcs is determined to be |Vcs| = 0.969 +- 0.058.
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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.