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Peskin/schroeder RG flow diagram

  1. Aug 25, 2013 #1
    On page 403, diagram 12.1 (b) of Peskin and Schroeder, does anyone know why the coupling constant at first increases to the right, and then all of a sudden decreases to left until it reaches the fixed point zero?

    According to equation 12.28, as b→0, the coupling decreases monotonically. So shouldn't the coupling always be decreasing?
  2. jcsd
  3. Aug 25, 2013 #2
    I think it's just the perspective. The curves are supposed to be in the m^2 = 0 plane.
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