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?(adsbygoogle = window.adsbygoogle || []).push({});

According to equation 12.28, as b→0, the coupling decreases monotonically. So shouldn't the coupling always be decreasing?

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# Peskin/schroeder RG flow diagram

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