The process for finding the annihilation term is similar to the above. Since the two diagrams are related by crossing symmetry, and the initial and final state particles are the same, it is sufficient to permute the momenta, yielding  \frac{1}{4} \sum_{\mathrm{spins}} |\mathcal{M}|^2 \,	 = \frac{32e^4}{4(k+p)^4} \left( (k \cdot k') (p \cdot p') + (k' \cdot p) (k \cdot p') \right) \, =\frac{8e^4}{s^2} \left(\tfrac{1}{2} t \tfrac{1}{2}t + \tfrac{1}{2}u \tfrac{1}{2} u \right) \, = 2 e^4 \frac{t^2 +u^2}{s^2} \,

http://www.sciencealert.com/scientists-may-have-found-the-part-of-the-brain-that-enables-lucid-dreaming

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