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Positron Scattering

Consider positron scattering, which (in lowest order) is represented by either of the two equivalent graphs

Figure 6.11: Positron scattering.
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The incident wave is an electron of negative frequency (negative energy) labelled by quantum numbers $-\vec{p}_+$, $-s_+$, $\epsilon=-1$. The final state (outgoing wave) is represented as a negative-energy electron too.

Douglas M. Gingrich (gingrich@