The process $e^{+}{e}^{-}\to \varphi \eta$ is studied at 22 center-of-mass energy points ($\sqrt{s}$) between 2.00 and 3.08 GeV using $715{\mathrm{pb}}^{-1}$ of data collected with the BESIII detector. The measured Born cross section of $e^{+}{e}^{-}\to \varphi \eta$ is found to be consistent with BABAR measurements, but with improved precision. A resonant structure around 2.175 GeV is observed with a significance of $6.9\sigma$ with mass $(2163.5\pm 6.2\pm 3.0)\mathrm{MeV}/c^2$ and width $({31.1}_{-11.6}^{+21.1}\pm 1.1)\mathrm{MeV}$, where the first uncertainties are statistical and the second are systematic.

• Received 26 April 2021
• Accepted 7 July 2021

DOI:https://doi.org/10.1103/PhysRevD.104.032007

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Published by the American Physical Society