Measurement of $B^0\to J/\psi {\eta }^{(}{}^{\prime }{}^{)}$ and Constraint on the $\eta -{\eta }^{\prime }$ Mixing Angle

Abstract

We measure the branching fractions of $B^0\to J/\psi {\eta }^{(}{}^{\prime }{}^{)}$ decays with the complete Belle data sample of $772\times 10^6$ $B\bar{B}$ events collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. The results for the branching fractions are: $\mathcal{B}(B^0\to J/\psi \eta )=(12.3{\pm }_{1.7}^{1.8}\pm 0.7)\times 10^{-6}$ and $\mathcal{B}(B^0\to J/\psi {\eta }^{\prime })<7.4\times 10^{-6}$ at 90% confidence level. The $\eta -{\eta }^{\prime }$ mixing angle is constrained to be less than $42.2^{\circ }$ at 90% confidence level.

6 pages, 2 figures, 3 tables. submitted to PRD(RC)

References in corpus (1)

• Composition of the Pseudoscalar Eta and Eta' Mesons

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