Pion and nucleon relativistic electromagnetic four-current distributions

The quantum phase-space approach allows one to define relativistic spatial distributions inside a target with arbitrary spin and average momentum. We apply this quasiprobabilistic formalism the whole electromagnetic four-current operator in case of spin-0 spin-$\frac{1}{2}$ targets, study detail frame dependence corresponding distributions, compare our results those from light-front formalism. While former works focused on charge we extend here investigations current distributions. clarify role played by Wigner rotation argue that properties are most naturally understood terms Sachs form factors, contrary what previously suggested. Finally, illustrate using pion nucleon factors extracted experimental data.