Griffiths Introduction to Elementary Particles · Problem 6.7

The Feynman Calculus — David J. Griffiths

Physics — QFT · cm-frame-kinematics

Problem

In the CM frame, with p2=−p1\mathbf{p}_2 = -\mathbf{p}_1, show that (p1⋅p2)2−(m1m2c2)2=(E1+E2)∣p1∣/c\sqrt{(p_1 \cdot p_2)^2 - (m_1 m_2 c^2)^2} = (E_1 + E_2)|\mathbf{p}_1|/c

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