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arXiv · hep-ex/0307032

Evidence for the Rare Decay B -> J/psi eta K

The BABAR Collaboration·B. Aubert
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Abstract

We report evidence for the $B$ meson decays, $B^\pm\to J/ψηK^\pm$ and $B^0\to J/ψηK^0_S$, using {90} million $B\bar B$ events collected at the $\ensuremath{Υ{(4S)}}$ resonance with the \babar detector at the PEP-II $e^+ e^-$ asymmetric-energy storage ring. We obtain preliminary branching fractions in the charged and neutral channels of $(10.8\pm 2.3(stat.)\pm 2.4(syst.))\times 10^{-5}$ and $(8.4\pm 2.6(stat.)\pm 2.7(syst.))\times 10^{-5}$, respectively.

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The BABAR Collaboration, B. Aubert. 2003-07-15. Evidence for the Rare Decay B -> J/psi eta K. https://arxiv.org/abs/hep-ex/0307032

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