A. Zee, Quantum Field Theory in a Nutshell · Problem III.1.2

Field Theory Redux

Physics — QFT

Problem

Regard (1) as an analytic function of

K^2

. Show that it has a cut extending from

4m^2

to infinity. [Hint: If you can't extract this result directly from (1) look at (14). An extensive discussion of this exercise will be given in chapter III.8.]

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