Journal article

Measurement of B-0 -> J/psi eta((')) and constraint on the eta - eta ' mixing angle

Chang, M.-C.; Duh, Y.-C.; Lin, J.-Y.; Adachi, I.; Adamczyk, K.; Aihara, H.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Bhardwaj, V.

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


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