For the Gordon identity(adsbygoogle = window.adsbygoogle || []).push({});

$$2m \bar{u}_{s'}(\textbf{p}')\gamma^{\mu}u_{s}(\textbf{p}) = \bar{u}_{s'}(\textbf{p}')[(p'+p)^{\mu} -2iS^{\mu\nu} (p'-p)_{\nu}]u_{s}(\textbf{p}) $$

If I plug in $\mu$=5, what exactly does the corresponding $(p'+p)^{5}$ represent?

4 vectors can only have 4 components so is this just an exponential?

Thanks

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# Confusion with the Gordon identity

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