- #1

- 41

- 1

## Main Question or Discussion Point

I am thinking about a problem. Consider the forward Compton scattering process e(p)+γ(k) -> e(p)+γ(k), as shown in the following figure.

If we consider the initial red photon is emitted by another electron which then goes to anything, then how can we write down the whole amplitude for this process?

The problem troubles me is that the red photon becomes a propagator with k^2 = p^2 = 0, which is divergent if in the denominator!

If we consider the initial red photon is emitted by another electron which then goes to anything, then how can we write down the whole amplitude for this process?

The problem troubles me is that the red photon becomes a propagator with k^2 = p^2 = 0, which is divergent if in the denominator!