%0 Journal Article
%T Gauge Invariance and Factorisation in Exclusive Meson Production
%A A Hebecker
%A P V Landshoff
%J Physics
%D 1997
%I arXiv
%R 10.1016/S0370-2693(97)01413-5
%X The structure of the nonperturbative vector meson vertex function complicates the proof of the factorisation theorem for the reaction $\gamma^*p\to Vp$. It leads to additional contributions but, in a simple model for the vertex function, gauge invariance ensures that they cancel and factorisation is preserved.
%U http://arxiv.org/abs/hep-ph/9710296v1