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Homework Help: Integrating od Dirac Delta

  1. Jan 19, 2017 #1
    How to get this relation
    $$ \int\frac{d^3\textbf{p}_4}{2E_4} \delta^4(q+p-p_4) \rightarrow \delta[(p+q)^2-M^2] $$

    with ## q=p_2 - p_4, \quad p_2=(M,0).##

    I tried to separate it
    $$ \delta^4(q+p_2-p_4) =\delta^3(\textbf{q}-\textbf{p}_4)\delta(q_0+M-E_4)$$
  2. jcsd
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