Measurement of $\Sigma^+$ transverse polarization in $e^+e^-$ collisions at $\sqrt{s} = 3.68-3.71$ GeV

TL;DR

This study measures the energy-dependent transverse polarization and electromagnetic form factors of the Sigma-plus hyperon in electron-positron collisions, providing insights into hyperon pair production mechanisms.

Contribution

It presents the first detailed energy-dependent measurement of Sigma-plus hyperon polarization and form factors in e+e- collisions near 3.7 GeV, enhancing understanding of hyperon production.

Findings

Measured transverse polarization of Sigma+ hyperons across energies

Determined phase and modulus ratio of electromagnetic form factors

Results aid in understanding hyperon pair production mechanisms

Abstract

Using $e^+e^-$ collision data collected with the BESIII detector at seven energy points ranging from 3.68 to 3.71 GeV and corresponding to an integrated luminosity of $652.1~{\rm pb^{-1}}$, we present an energy-dependent measurement of the transverse polarization, relative phase and modulus ratio of the electromagnetic form factors of the $\Sigma^+$ hyperon in the $e^+e^- \to \Sigma^+ \bar{\Sigma}^-$ reaction. These results are helpful to understand the production mechanism of the $\Sigma^+$-$\bar\Sigma^-$ pairs.