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Recent results on hyperon pair production and nucleon time-like form factors at BESIII

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arxiv 2110.12475 v2 pith:G24HLKAF submitted 2021-10-24 hep-ex

classification hep-ex
keywords besiiifactorsformnucleonoverlineprocessresultssigma
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

The BESIII experiment, based on the BEPCII collider at IHEP in Beijing, China, is capable of measuring nucleon form factors with unprecedented precision. We report recent results achieved by the BESIII collaboration concerning the nucleon time-like form factors and the hyperon pair production. More in detail we outline the results obtained by the study of the process $e^+e^- \to p \overline p$, using both the scan-energy and initial-state radiation techniques, those of the process $e^+e^- \to n \overline n$, and the study of the $\Sigma$ polarization regarding the process $e^+e^- \to J/\psi \to \Sigma^+\overline \Sigma{}^-$.

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  1. The electromagnetic form factors of $\Sigma$ and $\Sigma^0 \to \Lambda$ transition in the timelike region

    hep-ph 2025-07 conditional novelty 4.0 of 10

    An extended vector meson dominance model with excited rho, omega, and phi states reproduces e+e- to Sigma Sigma-bar and e+e- to Lambda Sigma-zero data, and predicts unmeasured form factor ratios and phases.

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