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Mandl & Shaw page 359

  1. Aug 3, 2013 #1
    1. The problem statement, all variables and given/known data
    In the second edition of Mandl & Shaw QFT, on page 359, in the unnumbered eqn below eqn (15.117) it says:
    [tex]N^{\mu\nu}(q - kz, k) = q^{\mu}q^{\nu} - k^{\mu}k^{\nu}z(1 -z) + \cdots[/tex]

    2. Relevant equations
    eqn (15.116) on page 358 has a typo in it, but should say:
    [tex]N^{\mu\nu}(p, k) = (p + k)^{\mu}k^{\nu}[/tex]

    The first unnumbered eqn at the top of page 359 says:
    [tex]q = p + kz[/tex]

    3. The attempt at a solution
    I don't see how this can possibly be since eqn (15.116) says N is linear in p and the unnumbered eqn at the top of page 359 says q is linear in p. So how can N be quadratic in q?
  2. jcsd
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