Measurement of Born cross section of $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$ at $\sqrt{s}=3.50-4.95$ GeV

Abstract

Using $e^{+}{e}^{-}$ collision data collected with the BESIII detector at the BEPCII collider at thirty-two center-of-mass energies from 3.50 to 4.95 GeV, corresponding to an integrated luminosity of 25 $\mathrm{f}{\mathrm{b}}^{-1}$, we measure the Born cross section of the $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$ reaction and the effective form factor. No significant charmonium(-like) state, i.e., $\psi (3770)$, $\psi (4040)$, $\psi (4160)$, $\psi (4230)$, $\psi (4360)$, $\psi (4415)$, or $\psi (4660)$, decaying into the ${\Sigma }^0{\bar{\Sigma }}^0$ final state is observed by fitting the $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$ dressed cross section. The upper limits for the product of the branching fraction and the electronic partial width at the 90% confidence level are provided for each assumed charmonium(-like) state. In addition, the ratios of the Born cross section and the effective form factor between the $e^{+}{e}^{-}\to {\Sigma }^0{\bar{\Sigma }}^0$ and the $e^{+}{e}^{-}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$ reactions are provided, which can be used to validate the prediction of the vector meson dominance model.

9 pages, 3 figures, 1 Supplemental Material, consistent with the publication in Phys. Rev. D (Letter) $111$, L051502 (2025)

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