Measurement of the $e^+e^- \to \Lambda\bar\Sigma^0 + c.c.$ cross sections at $\sqrt{s}$ from 2.3094 to 3.0800 GeV

TL;DR

This study measures the cross sections and form factors of the process e+e- to Lambda Sigma0 at energies from 2.3094 to 3.0800 GeV, revealing a significant non-zero cross section near the threshold and providing more precise data than previous experiments.

Contribution

First measurement of the e+e- to Lambda Sigma0 cross sections over this energy range with improved precision and detailed lineshape analysis.

Findings

Non-zero cross section observed at 2.3094 GeV with high significance

Cross section lineshape favors a plateau near threshold over pQCD models

Enhanced precision compared to earlier BaBar measurements

Abstract

The Born cross sections and effective form factors of the process $e^+e^-\to\Lambda\bar\Sigma^0 + c.c.$ are measured at 14 center-of-mass energy points from 2.3094 to 3.0800 GeV, based on data corresponding to an integrated luminosity of $(478.5 \pm 4.8)\ \text{pb}^{-1}$ collected with the BESIII detector. A non-zero Born cross section is observed at the center-of-mass energy of 2.3094 GeV with a statistical significance of more than five standard deviations, and the cross sections at other energies are obtained with improved precision compared to earlier measurements from the BaBar Collaboration. The Born cross-section lineshape is described better by a shape with a plateau near the threshold than by a pQCD motivated functional form.