Observation of the decay $B^0 \to J/ψη$

Details Observation of the decay $B^0 \to J/ψη$ Observation of the decay $B^0 \to J/ψη$

2006-09-26

arxiv.org/abs/hep-ex/0609047v2

Phys.Rev.Lett.98:131803,2007

Physics

High Energy Physics

High Energy Physics - Experiment

5 pages, 2 figures, submit to PRL (8 pages, 2 figures, ICHEP'06 Conference Paper)

Scientific paper

10.1103/PhysRevLett.98.131803

We report the first observation of $B^0 \to J/\psi \eta$ decay. These results are obtained from a data sample that contains 449 million $B\bar{B}$ pairs accumulated at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+ e^-$ collider. We observe a signal with a significance of 8.1$\sigma$ and obtain a branching fraction of (9.5 $\pm$ 1.7 (stat) $\pm$ 0.8 (syst))$\times 10^{-6}$.

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