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For the study of the structure of baryons it is necessary to investigate the production of a baryon pair in e+e− annihilation. The baryon-antibaryon pair production at the electron-positron linear collider makes it possible to investigate in detail the basic structure of the Standard Model. The creation of baryon-antibaryon pairs in electron-positron annihilation provides an increasingly powerful tool at higher c.m. energies. We present phenomenological results for Σ0Σ¯0 production in e+e− interaction at the BESIII and Colliders. In the present work, we investigate a hyperon pair produced in the reaction e+e−→Σ0Σ¯0. We calculate the total cross section of the process e+e−→Σ0Σ¯0 taking into account the contributions of the D-meson loop and three gluon loops as well as the interference of all diagrams to the Born approximation. For these contributions large relative phases are generated with respect to the pure electromagnetic mechanism. For the large momentum transferred region we obtain as a byproduct a fit of the electromagnetic form factor of the Σ hyperon. Published by the American Physical Society 2024
Near-threshold $$\varLambda {\bar{\varLambda }}$$ Λ Λ ¯ mass spectra for the reactions $$e^+e^- \rightarrow \eta \varLambda {\bar{\varLambda }}$$ e + e - → η Λ Λ ¯ and $$e^+e^- \rightarrow \phi \varLambda {\bar{\varLambda }}$$ e + e - → ϕ Λ Λ ¯ are investigated with an emphasis on the role played by the interaction in the $$\varLambda {\bar{\varLambda }}$$ Λ Λ ¯ system. A variety of $$\varLambda {\bar{\varLambda }}$$ Λ Λ ¯ potential models is employed that have been established in the analysis of data on $$p{\bar{p}}\rightarrow \varLambda {\bar{\varLambda }}$$ p p ¯ → Λ Λ ¯ in the past. It is shown that the near-threshold enhancement observed for the two $$e^+e^-$$ e + e - reactions can be reproduced by considering the $$\varLambda {\bar{\varLambda }}$$ Λ Λ ¯ final-state interaction in the partial waves suggested by the helicity-angle analysis of the experiments. For $$e^+e^- \rightarrow \eta \varLambda {\bar{\varLambda }}$$ e + e - → η Λ Λ ¯ the same $$\varLambda {\bar{\varLambda }}$$ Λ Λ ¯ S-wave interaction as in $$e^+e^- \rightarrow \varLambda {\bar{\varLambda }}$$ e + e - → Λ Λ ¯ is relevant and with it a consistent description of the pertinent measurements can be achieved. It is pointed out that a nonzero threshold cross section as observed for the latter reaction is not supported by the new $$\eta \varLambda {\bar{\varLambda }}$$ η Λ Λ ¯ data.
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