Electromagnetic form factors of neutron and neutral hyperons in the oscillating point of view

Abstract：

Based on the recent precise measurements by the BESIII collaboration for electron–positron annihilation into a neutron and antineutron pair, the effective form factors of the neutron were determined in the time-like region, and it was found that the effective form factors of the neutron are smaller than those of the proton. The effective form factors of the neutron show a periodic behaviour, similar to those of the proton. Here, a comparative analysis for Λ, $ \Sigma^0 $ and $ \Xi^0 $ hyperons is performed. Fits of the available data on the effective form factors of Λ, $ \Sigma^0 $ and $ \Xi^0 $ with zero charge show an interesting phenomenon in the oscillating behavior of their effective form factors. However, this will need to be confirmed by future precise experiments. Both theoretical and experimental investigations of this phenomenon can shed light on the reaction mechanisms of the electron–positron annihilation processes.