  Experimental data suggest the existence of a minimal length scale in
annihilation process for the reaction e+e- --> gamma gamma (gamma). Nonlinear
electrodynamics coupled to gravity and satisfying the weak energy condition
predicts, for an arbitrary gauge invariant lagrangian, the existence of a
spinning charged electromagnetic soliton asymptotically Kerr-Newman for a
distant observer with a gyromagnetic ratio g=2. Its internal structure includes
an equatorial disk of de Sitter vacuum which has properties of a perfect
conductor and ideal diamagnetic, and displays superconducting behavior within a
single spinning soliton. De Sitter vacuum supplies a particle with the finite
positive electromagnetic mass related to breaking of space-time symmetry. We
apply this approach to interpret the existence of a minimal characteristic
length scale in annihilation.
