What is the correct way to expand (p(adsbygoogle = window.adsbygoogle || []).push({}); _{3}-p_{4})^{2}where p_{3}and p_{4}are 4-vectors, with metric g_{mu nu}=diag[1,-1,-1,-1], p = [w_{p},p], wherepis 3-vector, and w_{p}= (p^{2}+m^{2})^{(1/2)}

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# I Square of the difference of four-vectors

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