Jan 10 – 14, 2022
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Recent result of baryon time-like form factors at BESIII

Jan 11, 2022, 3:00 PM
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Parallel session talk Standard Model Precision SM Measurements


Weimin Song (Jilin University College of Physics (CN))


Electromagnetic form factors allow to investigate fundamental properties of the baryons.
The BESIII collaboration has studied the time-like form factors of the proton and neutron with significantly improved precision. An intriguing periodic behavior of effective form factors lineshape is observed for both proton and neutron. Hyperons provide a unique avenue to study the strong interaction in baryon structure. Due to the unstable nature of hyperon, their form factors are usually studied in time-like via e+e- annihilations experiments. With the unique data sets obtained by the BESIII collaboration, the pair production cross sections for Lambda, Sigma, Xi, and Lambda_c are studied from threshold, where some abnormal threshold effects are observed. Using the self-analyzing weak decays of the Lambda and Lambda_c, the relative phase between the electric and magnetic form factors is measured. In this presentation the latest results on baryon form factors at BESIII are discussed.

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