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arXiv · 1209.0064

η transitions between charmonia with meson loop contributions

Dian-Yong Chen·Xiang Liu·Takayuki Matsuki
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Abstract

We study the $η$ transitions between $ψ(4040/4160)$ and $J/ψ$ by introducing charmed meson loops in an effective Lagrangian approach to enhance the decay amplitudes. The branching fractions $\mathcal{B}[ψ(4040) \to J/ψη]$ and $\mathcal{B}[ψ(4160) \to J/ψη]$ estimated in this paper can remarkably explain the experimental measurements of Belle and BESIII within a reasonable parameter range. The $η^\prime$ transition between $ψ(4160)$ and $J/ψ$ is also investigated, and the branching fraction is under the upper limit of CLEO, which can be tested by future experiments.

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Dian-Yong Chen, Xiang Liu, Takayuki Matsuki. 2013-02-19. η transitions between charmonia with meson loop contributions. https://doi.org/10.1103/physrevd.87.054006

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