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

TL;DR

This study measures the cross section and form factor of the process $e^+e^- o \Sigma^0ar{\Sigma}^0$ across energies 3.50-4.95 GeV, finding no significant charmonium contributions and providing upper limits and ratio comparisons.

Contribution

First precise measurement of the Born cross section and form factor for $e^+e^- o \\Sigma^0ar{\\Sigma}^0$ over a broad energy range with no observed charmonium signals.

Findings

No significant charmonium(-like) states observed decaying into $\\Sigma^0ar{\\Sigma}^0$.

Upper limits set for branching fractions and electronic widths of potential charmonium states.

Ratios of cross sections and form factors between $\\Sigma^0ar{\\Sigma}^0$ and $\\Sigma^+ar{\\Sigma}^-$ are consistent with vector meson dominance model predictions.

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 $\rm{fb^{-1}}$, 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.