Divergent Vertices and Ward Identities

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Abstract
Schwinger and Adler have discovered that if the A1−ω−ρ off-shell vertex function is linearly divergent, then the axial-vector Ward identity for the A1−ω−ρ vertex contains an extra model-dependent term. It is shown here that no extra term occurs in the Ward identities for the A1−ρ−π system when the A1−A1−ρ vertex is linearly divergent.

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