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c++guru
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If I have a scalar field $$\alpha$$ and a Dirac particle $$\beta$$ and its anti particle $$\overline{\beta}$$ such that the three couple to give a vertex factor of $$-ik$$ when evaluating the Feynman diagram (where k is an arbitrary constant).
How do I evaluate the first order diagram of $$\alpha \longrightarrow \beta + \overline{\beta}$$
How do I evaluate the first order diagram of $$\alpha \longrightarrow \beta + \overline{\beta}$$