Griffiths Introduction to Elementary Particles · Problem 6.12

Quantum Electrodynamics — David J. Griffiths

Physics — QFT · abc-theory-feynman-diagrams

Problem

(a) Draw all the lowest-order diagrams for

A + A \to A + A

. (There are six of them.) (b) Find the amplitude for this process, in lowest order, assuming

m_B = m_C = 0

. Leave your answer in the form of an integral over one remaining four-momentum,

q