Microscopic Parametrization of the Near Threshold Oscillations of the Nucleon Time-Like Effective Electromagnetic Form Factors

We present an analysis of the recent near threshold BESIII data for thenucleon time-like effective form factors. The damped oscillation emerging fromthe subtraction of the dipole formula is treated in non-perturbative-QCD,making use of the light cone distribution amplitudes expansion.Non-perturbative effects are accounted for by considering Q2-dependentcoefficients in such expansions, whose free parameters are determined byfitting to the proton and neutron data. Possible implications and futureanalysis have been discussed.