Gauge Invariance and Factorisation in Exclusive Meson Production
classification
✦ hep-ph
keywords
factorisationfunctiongaugeinvariancemesonvertexadditionalcancel
read the original abstract
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.
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