Derivation of the SG SWEP

•The lowest order NN interaction is represented by the 2nd order Feynman diagrams shown below. Using Feynman rules an expression for an NN scattering amplitude is written down. [See e.g. Bjorken and Drell, Relativistic Quantum Mechanics (1964) ] The only change is that the Feynman propagator is replaced by the SG propagator. 

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p

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n

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p

n’

P’

P’

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