Type: Article
Publication Date: 2021-09-28
Citations: 22
DOI: https://doi.org/10.1103/physrevd.104.052012
Using data samples with a total integrated luminosity of $20.1\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected by the BESIII detector operating at the BEPCII collider, the cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\psi}(3686)$ is measured at center-of-mass energies between 4.0076 and 4.6984 GeV. The measured cross section is consistent with previous results, and with much improved precision. A fit to the measured energy-dependent cross section, which includes three Breit-Wigner functions and a nonresonant contribution, confirms the existence of the charmonium-like states $Y(4220)$, $Y(4390)$, and $Y(4660)$. This is the first observation of the $Y(4660)$ at the BESIII experiment.