Inclusive current-induced reactions and light-cone singularities

We analyze inclusive reactions of the type current + t → p + anything, where t denotes other the vacuum or a hadronic target and p a produced hadron state. Conditions in momentum space are derived which enforce the scaling behaviour due to a canonical leading light-cone singularity structure. The multiplicity for the production of p off a hadron target grow less fast than the c.m. energy. The problem of continuation of deep-inelastic scattering amplitudes to the annihilation channel is investigated. Finally we outline how hadronic scaling is obtained in the limit of finite current mass.