  Collisions of non-topological solitons, Q-balls, are considered in the
Minimal Supersymmetric Standard Model where supersymmetry has been broken at a
low energy scale via a gauge mediated mechanism. Q-ball collisions are studied
numerically on a two dimensional lattice for a range of Q-ball charges. Total
cross-sections, as well as fusion and geometrical cross-sections are
calculated. The total and geometrical cross-sections appear to converge with
increasing charge. The fusion cross-section has been estimated to be larger
than 60% of the geometrical cross-section for large balls.
