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Peskin and Schroeder - page 4 - choice of notation

  1. Jan 21, 2016 #1
    In page 4, Peskin and Schroeder has the following diagram:

    Capture.jpg

    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?
     
  2. jcsd
  3. Jan 21, 2016 #2

    Orodruin

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    You can call things whatever you like as long as you define what is meant. Throughout PS you will notice p, k, and q being used to denote different momenta (and more importantly, 4-momenta) simply for the reason that the others are being used to denote something else in the particular context.
     
  4. Jan 21, 2016 #3
    Thanks! :)
     
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