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[en] The muonic decay of charmed strange mesons has been observed directly, in the analysis of a sample of 144 decays of charged charmed particles into a muon and no other charged particle. The branching ratio is estimated to be BR (Ds±→μ±νμ) = (4.0-1.4-0.6+1.8+0.8±1.7) x 10-3, assuming a ratio r = 0.27 between production cross sections of Ds± and neutral charmed particles. The decay constant fDs is estimated to be (232 ± 45 ± 20 ± 48) MeV/c2 and does not depend on theoretical assumptions. (author)
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