# 30th International Symposium on Lepton Photon Interactions at High Energies

Jan 10 – 14, 2022
Online only
Europe/London timezone

## Recent result of baryon time-like form factors at BESIII

Jan 11, 2022, 3:00 PM
20m
Online only

#### Online only

Parallel session talk Standard Model

### Speaker

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

### Description

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.