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Measurement of branching fractions for B -> J / K decays and search for a narrow resonance in the J / final state
We report an observation of the |$B^{\pm } \to J/\psi \eta K^{\pm }$| and |$B^0 \to J/\psi \eta K^0_S$| decays using |$772\times 10^{6}B\overline {B}$| pairs collected at the |$\Upsilon (4S)$| resonance with the Belle detector at the KEKB asymmetric-energy |$e^+e^-$| collider. We obtain the branching fractions |${\mathcal B}(B^{\pm }\rightarrow J/\psi …