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I am reading Srednicki's QFT book in physics. On page 286, the formula $(45.16)$ has a notation $\not{p}$. What is the meaning of $\not{p}$ in physics? Thank you very much.

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This is Feynman slash notation, viz. $\not{v}=\gamma^\mu v_\mu$ for any four-vector $v_\mu$ (in this case four-momentum).

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    $\begingroup$ The notation looks dazzling. $\endgroup$ – Ng Chung Tak Jan 9 '18 at 13:34
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It's called the Feynman slash, and it's shorthand for $\gamma^\mu p_\mu $, where $\gamma^\mu $ are the Dirac gamma matrices.

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