Griffiths Introduction to Elementary Particles · Problem 9.10

Quantum Chromodynamics — David J. Griffiths

Physics — QFT · three-gluon-vertex-amplitude

Problem

Derive equation (9.45) from equation (9.44), using q=p3+p4q = p_3 + p_4, q2=2p3⋅p4q^2 = 2p_3 \cdot p_4, and ϵ3⋅p3=ϵ4⋅p4=0\epsilon_3 \cdot p_3 = \epsilon_4 \cdot p_4 = 0.

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