One-loop Self Energies in Softly Broken Supersymmetric QED
  We apply the supergraph with spurion technique to compute the renormalization of one-loop diagrams that contributes to electron and selectron self energies in a softly broken Supersymmetric Quantum Electrodynamics (SQED). In particular, we calculate the one-loop gauge superfield contribution to the two-point function. 
Tino S. Nyawelo and Paolo Gondolo