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Improved measurements of branching fractions for $η_c\toϕϕ$ and $ωϕ$

Preprint published in 2016 by Medina Ablikim, Mikhail N. Achasov, Samer Ali Nasher Ahmed, R. Baldini Ferroli, Yu Bai, Y. Hu, Olga Bakina, Rinaldo Baldini Ferroli, Yong Ban, Niklaus Berger, Dan W. Bennett, X. S. Jiang, Jake Bennett, Junying Chai, Hesheng S. Chen and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Postprint: policy unknown
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Abstract

Using $(223.7±1.4)\times10^6$ $J/ψ$ events accumulated with the BESIII detector, we study $η_c$ decays to $ϕϕ$ and $ωϕ$ final states. The branching fraction of $η_c\toϕϕ$ is measured to be $Br(η_c\toϕϕ)=(2.1±0.1±0.3±0.5)\times10^{-3}$, where the first uncertainty is statistical, the second is systematic, and the third is from the uncertainty of $Br(J/ψ\toγη_c)$. No significant signal for the double OZI-suppressed decay of $η_c\toωϕ$ is observed, and the upper limit on the branching fraction is determined to be $Br(η_c\toωϕ)