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helpcometk

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## Homework Statement

Draw the Feynman diagram vertex corresponding to the interaction L

_{int}= eA

^{μ}J

_{μ},

where A

^{μ}is the electromagnetic field and e is the coupling constant. Draw all the Feynman

diagrams in quantum electrodynamics to O(e2) describing the processes:

(i) e+e- ----> e+e-,

(ii) e+e- ----> μ+μ-

(iii)γ e- ------> γ e-

## Homework Equations

Any ideas on how i should approach this question?