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In the process $$e^+e^- \rightarrow \gamma \gamma$$ for which the amplitude can be written as: $M= \epsilon^*_{1\nu}\epsilon^*_{2\mu}(A^{\mu\nu}+\tilde{A}^{\mu\nu})$, where $\epsilon_i$ is the polarization vector of a photon. What do the tensors $A^{\mu\nu}$ & $\tilde{A}^{\mu\nu}$ equal to?enter image description here

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