Measurement of $B^0 \to J/ψη^{(}{}'{}^{)}$ and Constraint on the $η-η'$ Mixing Angle

Details Measurement of $B^0 \to J/ψη^{(}{}'{}^{)}$ and Constraint on the $η-η'$ Mixing Angle Measurement of $B^0 \to J/ψη^{(}{}'{}^{)}$ and Constraint on the $η-η'$ Mixing Angle

2012-03-15

arxiv.org/abs/1203.3399v1

Physics

High Energy Physics

High Energy Physics - Experiment

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

Scientific paper

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

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