Cross section measurement of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ from $\sqrt{s}=$ 4.008 GeV to 4.951 GeV

Abstract

Using data samples with a total integrated luminosity of $22.1\mathrm{f}{\mathrm{b}}^{-1}$ at center-of-mass energies between 4.008 and 4.951~GeV collected with the BESIII detector, the cross sections of $e^{+}{e}^{-}\to {\pi }^0{\pi }^0\psi (3686)$ process are measured. The obtained cross sections are found to be approximately one-half of those of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3686)$, consistent with the isospin symmetry expectation. A coherent fit to the dressed cross sections is performed, with the $Y(4230)$~parameters fixed at the values measured in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3686)$. The significances of the $Y(4390)$ and $Y(4660)$ are both larger than $5\sigma$, and their masses and widths are consistent with the previous measurement in the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}\psi (3686)$ process.

12 pages, 5 figures

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