In order to use the path integral formulation for the derivation of the Feynman propagator, we need to introduce a slightly complex mass.(adsbygoogle = window.adsbygoogle || []).push({});

Problem: how do we interpret the circumstance that we cannot interchange integration and taking the epsilon limes?

Is the parameter m in the free Lagrangian the true mass? Or is the physical mass subject to a redefinition that takes the aforementioned problem into account?

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# I-epsilon prescription and the definition of mass

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