PROBLEMS 7.1 Derive the lowest-order non-vanishing S-matrix element (7.19) and hence the corresponding Feynman amplitude for Bhabha scattering, i.e. the process e+(p?, r?) + e-(p?, r?) ? e+(p?, s?) + e-(p?, s?). 7.2 Show that the Feynman amplitude for the photon self-energy diagram in Fig. 7.9 is given by M = -eĀ²/(2?)? ? d?p Tr [?_r(k) S_F(p+k) ?_s(k) S_F(p)] where k and ?_r(k) are the momentum and polarization vectors of the photon.
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- Bhabha scattering involves the interaction: \( e^+(p_1, r_1) + e^-(p_2, r_2) \to e^+(p_1', s_1) + e^-(p_2', s_2) \). Show moreā¦
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