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One of the fundamental goals of particle physics is to gain microscopicunderstanding of the strong interaction. Electromagnetic form factors quantifythe structure of hadrons in terms of charge and magnetization distributions.While the nucleon structure has been investigated extensively, data on hyperonsis still scarce. It has recently been demonstrated that electron-positronannihilations into hyperon-antihyperon pairs provide a powerful tools toinvestigate their inner structure. We present a novel method useful forhyperon-antihyperon pairs of different types which exploits the cross sectionenhancement due to the vacuum polarization effect at the $J/\psi$ resonance.Using the 10 billion $J/\psi$ events collected with the BESIII detector, thisallows a thorough determination of the hyperon structure . The result isessentially a precise snapshot of a$\bar\Lambda\Sigma^0$~($\Lambda\bar\Sigma^0$) pair in the making, encoded inthe form factor ratio and the phase. Their values are measured to be $R =0.860\pm0.029({\rm stat.})\pm0.010({\rm syst.})$,$\Delta\Phi_1=(1.011\pm0.094({\rm stat.})\pm0.010({\rm syst.}))~\rm rad$ for$\bar\Lambda\Sigma^0$ and $\Delta\Phi_2=(2.128\pm0.094({\rmstat.})\pm0.010({\rm syst.}))~\rm rad$ for $\Lambda\bar\Sigma^0$, respectively.Furthermore, charge-parity (CP) breaking is investigated for the first time inthis reaction and found to be consistent with CP symmetry.

Novel method to extract the femtometer structure of strange baryons using the vacuum polarization effect