Search for $\psi (4S)\to \eta J/\psi$ in $B^\pm \ra ηJ/ψK^\pm$ and $e^{+}{e}^{-}\to \eta J/\psi$ processes

Abstract

We search for the $\psi (4S)$ state in $B^\pm \ra ηJ/ψK^\pm$ and $e^+e^- \ra ηJ/ψ$ based on the Belle measurements with the assumed mass $M=(4230\pm 8)$ MeV/$c^2$ and width $\Gamma =(38\pm 12)$ MeV. No significant signal is observed in the $\eta J/\psi$ mass spectra. The 90\% confidence level upper limit on the product branching fraction $\BR(B^\pm \ra ψ(4S)K^\pm)\BR(ψ(4S) \ra ηJ/ψ)<6.8\times 10^{-6}$ is obtained in $B^\pm \ra ηJ/ψK^\pm$ decays. By assuming the partial width of $\psi (4S)\to e^{+}{e}^{-}$ being 0.63 keV, the branching fraction limit $\BR(ψ(4S) \ra ηJ/ψ) < 1.3\%$ is obtained at the 90\% confidence level in $e^+e^- \ra ηJ/ψ$, which is consistent with the theoretical prediction.

4 pages, 2 figures

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• Observation of Two Resonant Structures in e+e- to pi+ pi- psi(2S) via Initial State Radiation at Belle
• Higher Charmonia and X,Y,Z states with Screened Potential
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Cited by in corpus (1)

• Search for missing $\psi (4S)$ in the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (2S)$ process