Measurement of the e+e- → Σ0(Σ)over-bar0 cross sections at center-of-mass energies from 2.3864 to 3.0200 GeV

The Born cross sections of e(+)e(-) -> Sigma(0)(Sigma) over bar (0) are measured at center-of-mass energies from 2.3864 to 3.0200 GeV using data samples with an integrated luminosity of 328.5 pb(-1) collected with the BESIII detector operating at the BEPCII collider. The analysis makes use of a novel reconstruction method for energies near production threshold, while a single-tag method is employed at other center-of-mass energies. The measured cross sections are consistent with earlier results from BaBar, with a substantially improved precision. The cross-section lineshape can be well described by a perturbative QCD-driven energy function. In addition, the effective form factors of the Sigma(0) baryon are determined. The results provide precise experimental input for testing various theoretical predictions. (C) 2022 The Author(s). Published by Elsevier B.V.

Automated summary

In this study, the Born cross sections of e(+)e(-) -> Sigma(0)(Sigma) over bar (0) are measured using data collected with the BESIII detector at the BEPCII collider. A novel reconstruction method and a single-tag method are applied for different center-of-mass energies. The results show consistent cross sections with improved precision compared to previous studies, and the cross-section lineshape can be well described by a perturbative QCD-driven energy function. The effective form factors of the Sigma(0) baryon are also determined, providing precise experimental input for testing theoretical predictions.