Search for $\psi(4S)\to\eta J/\psi$ in $B^\pm \to \eta J/\psi K^\pm$ and $e^+ e^- \to \eta J/\psi$ processes

分类： 物理学 >> 核物理学 提交时间： 2016-09-13

Gao Xu-yang Wang Xiao-long Shen Cheng-ping

摘要： We search for the ψ(4S) state in $B^\pm \ra \eta J/\psi K^\pm$ and $e^+e^- \ra \eta J/\psi$ based on the Belle measurements with the assumed mass M=(4230±8) MeV/c2 and width Γ=(38±12) MeV. No significant signal is observed in the ηJ/ψ mass spectra. The 90\% confidence level upper limit on the product branching fraction $\BR(B^\pm \ra \psi(4S)K^\pm)\BR(\psi(4S) \ra \eta J/\psi)<6.8\times 10^{-6}$ is obtained in$B^\pm \ra \eta J/\psi K^\pm$ decays. By assuming the partial width of ψ(4S)→e+e− being 0.63 keV, the branching fraction limit $\BR(\psi(4S) \ra \eta J/\psi) < 1.3\%$ is obtained at the 90\% confidence level in$e^+e^- \ra \eta J/\psi$, which is consistent with the theoretical prediction.

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