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We measure branching fractions $BR(B^+\\to\\eta_c K^+) = (0.69 + 0.26 - 0.21 +- 0.08 +- 0.20)\\times 10^{-3}$ and $BR(B^0\\to\\eta_c K^0) = (1.09 + 0.55 - 0.42 +- 0.12 +- 0.31)\\times 10^{-3}$, where the first error is statistical, the second is systematic and the third is from the $\\eta_c$ branching fraction uncertainty. From these we extract the $\\eta_c$ decay constant in the factorization approximation, $f_{\\eta_c} = 335 +- 75$ MeV. 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Edwards","submitted_at":"2000-07-07T13:37:33Z","abstract_excerpt":"In a sample of $9.66\\times 10^6 B\\bar{B}$ pairs collected with the CLEO detector we make the first observation of B decays to an $\\eta_c$ and a kaon. We measure branching fractions $BR(B^+\\to\\eta_c K^+) = (0.69 + 0.26 - 0.21 +- 0.08 +- 0.20)\\times 10^{-3}$ and $BR(B^0\\to\\eta_c K^0) = (1.09 + 0.55 - 0.42 +- 0.12 +- 0.31)\\times 10^{-3}$, where the first error is statistical, the second is systematic and the third is from the $\\eta_c$ branching fraction uncertainty. From these we extract the $\\eta_c$ decay constant in the factorization approximation, $f_{\\eta_c} = 335 +- 75$ MeV. 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