Vertex operators for production of baryon resonances in nucleon-gamma collisions with preserving gauge invariance and analyticity
classification
✦ hep-ph
keywords
analyticityoperatorsvertexbaryongaugeinvariancearbitrarycollisions
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Vertex operators for photo- and electro-production of baryon states with arbitrary spin-parity, $ \gamma + N\to B(J^P)$, are constructed. The operators obey gauge invariance and analyticity constraints. Analyticity is realized as a requirement of the generalized Siegert theorem for vertex form factors.
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