M AT2 te [uPintlvp [Dfcie7u

- ["(/>-)7>M*-)] [W(*+)7MW(P+)] . (10-80)

Fig. 10.5 The two Feynman diagrams which describe e+e scattering to second order.

where K2 — + k+)2 and q2 = (A;_ - p-)2. Note the relative minus sign between the two terms and the fact that the second term can be obtained from the first by the interchange of

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