Seagull vertex
= Seagull vertex
The scalar-QED term $e^2A_\mu A^\mu\phi^*\phi$ produces a local two-photon two-scalar vertex, conventionally called the seagull vertex.
= Seagull vertex
The scalar-QED term $e^2A_\mu A^\mu\phi^*\phi$ produces a local two-photon two-scalar vertex, conventionally called the seagull vertex.