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Study of the rare decay $J/\psi\rightarrow e^+e^- \phi$
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abstract
We study the decay process of $J/\psi\rightarrow e^+e^- \phi$ where the relatively clean electromagnetic (EM) transitions appear at leading order at tree level while the hadronic contributions only emerge via hadronic loop transitions. We include the low-lying scalar $f_0(980)$ and pseudoscalar $\eta/\eta'$ as the dominant contributions in the evaluation of the hadronic loop contributions. It is found that the hadronic effects are negligible comparing with the EM contributions. The decay width of $J/\psi\rightarrow e^+e^- \phi$ is determined to be about $2.12\times 10^{-6}$ keV if there is no any other leading mechanism contributing, and this result will be tested by the BESIII experiment with a large data sample of $J/\psi$.
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Cited by 1 Pith paper
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Searching for neutral state in the rare decay $J/\psi \rightarrow e^+ e^- \phi$
Dark photon and dark Z contributions to J/ψ → e+e−φ are far below the experimental limit, making the channel insensitive to these mediators.
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