In page 4, Peskin and Schroeder has the following diagram:(adsbygoogle = window.adsbygoogle || []).push({});

The diagram shows the collision of an electron beam and a positron beam to produce a ##\mu^{+}## beam a ##\mu^{-}## beam.

My question is this:

The electron and positron beams are shown to have momenta ##\textbf{p}## and ##\textbf{p}'##.

But the muon beams are shown to have momenta ##\textbf{k}## and ##\textbf{k}'##.

##\textbf{p}## is standard notation for momentum, but ##\textbf{k}## is standard notation for wavevector. But then, in natural units, ##\hbar=1##.

Therefore, is the different use of symbols for momenta a matter of notational difference, or is there some underlying physics I am missing?

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# Peskin and Schroeder - page 4 - choice of notation

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