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arXiv · 0711.2047

Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR

The BABAR Collaboration·B. Aubert
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Abstract

We present a study of the decays $B^{0,+}\to J/ψωK^{0,+}$ using $383\times 10^{6}$ $B\bar{B}$ events obtained with the \babar detector at PEP-II. We observe $Y(3940) \to J/ψω$, with mass $3914.6 ^{+3.8}_{-3.4} (stat) \pm{2.0} (syst)$ \mevcc, and width $34^{+12}_{-8}(stat)\pm{5}(syst)$ \mev. The ratio of $B^0$ and $B^+$ decay to $YK$ is $0.27^{+0.28}_{-0.23}(stat)^{+0.04}_{-0.01}(syst)$, and the relevant $B^0$ and $B^+$ branching fractions are reported.

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The BABAR Collaboration, B. Aubert. 2008-09-22. Observation of Y(3940) -> J/psi omega in B -> J/psi omega K at BABAR. https://doi.org/10.1103/physrevlett.101.082001

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