The cross section of the process $e^{+}{e}^{-}\to {\eta }^{\prime }J/\psi$ is measured at center-of-mass (c.m.) energies from $\sqrt{s}=4.178$ to 4.600 GeV using data samples corresponding to a total integrated luminosity of $11{\mathrm{fb}}^{-1}$ collected with the BESIII detector operating at the BEPCII storage ring. The dependence of the cross section on $\sqrt{s}$ shows an enhancement around 4.2 GeV. While the shape of the cross section cannot be fully explained with a single $\psi (4160)$ or $\psi (4260)$ state, a coherent sum of the two states does provide a reasonable description of the data.

• Received 3 November 2019

DOI:https://doi.org/10.1103/PhysRevD.101.012008

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Published by the American Physical Society