What is the Lagrangian of interaction of photon and spin zero charge scalar?The vertex of photon and spin 1/2 charge fermion is proportional with e multiplied vertor gamma matrix,but I do not know what is the vertex of photon and charge scalar.I hear that a vertex is proportional with polynomial of vector momenta(in general case) but I do not understand why.(adsbygoogle = window.adsbygoogle || []).push({});

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# What is the Lagrangian of interaction of photon and spin zero scalar?

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