Gauge Invariance and Factorisation in Exclusive Meson Production
A Hebecker, P V Landshoff
Abstract
The structure of the nonperturbative vector meson vertex function complicates the proof of the factorisation theorem for the reaction γ*p 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.
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