Griffiths Introduction to Elementary Particles · Problem 6.5

The Feynman Calculus — David J. Griffiths

Physics — QFT · two-body-decay-momentum

Problem

Solve equation (6.26) to obtain

\rho_0

, the value of

|\mathbf{p}_2|

consistent with conservation of energy in a two-body decay, and show that

\rho_0 = \frac{c}{2m_1}\sqrt{m_1^4 + m_2^4 + m_3^4 - 2m_1^2 m_2^2 - 2m_1^2 m_3^2 - 2m_2^2 m_3^2}

(See also Problem 3.16.)