Light-cone dominance of vertex functions for composite fields and asymptotic behaviour of elastic form factors

A major problem in the understanding of deep inelastic e-N scattering has been the failure of conventional renormalizable field theory, like, eg., Yukawa interaction at any finite order in the coupling constant, to give an explanation of the observed Bjorken scaling behaviour. A way out of this difficulty is to treat the target hadron as a relativistic composite system. The compositeness of the nucleon supplies a sufficiently fast decrease in the transverse momentum so as to give finite scaling functions. The same model has also proved useful in giving a qualitative understanding of the asymptotic behaviour of electromagnetic form factors. The authors accept in this note the idea of a hadron described by a composite field and try to analyse in this context the light-cone structure of its vertex functions. (20 refs).