Total cross section of the process e++e−→Σ++Σ¯− including the D -meson loop and three-gluon contributions

Abstract

In the present paper, we investigate the production of a baryon pair in e+e− annihilation to study the structure of baryons. To study the basic structure of the Standard Model, it is also necessary to consider the baryon-antibaryon pair production at the electron-positron linear collider. The production of a baryon pair in electron-positron annihilation provides a powerful tool at higher center-of-mass energies. In this work, we present phenomenological results for Σ+Σ¯− production in e+e− collision at the BESIII Collider. We investigate a hyperon pair produced in the reaction e+e−→Σ+Σ¯−. Two different contributions are considered: the D meson loop and the three-gluon charmonium annihilation loop. Taking into account the contributions of the D-meson loop and three-gluon loops and the interference of all diagrams, we calculate the total cross section of the process e+e−→Σ+Σ¯−. With respect to a purely electromagnetic mechanism, large relative phases are generated for these contributions. We obtain as a byproduct a fit of the electromagnetic form factor of the Σ hyperon for a large momentum transferred region. In this process, in addition to ψ(3770) charmonium, we also take into account the contributions of other charmonium (like) states, ψ(4040), ψ(4160), Y(4230), Y(4360), ψ(4415), and Y(4660). The obtained results are in good agreement with experimental data. Published by the American Physical Society 2025