Modifying the Dyson Series for Unstable Particles and Resonances
arXiv:2203.01253 · doi:10.1103/PhysRevD.105.076019
Abstract
In this work, we introduce a modification of the Dyson series based on the perturbative unitarity as a starting point. The presented approach systematically avoids singularities and double-counting related to the presence of unstable particles as intermediate states and, at the same time, it does not rely on a specific choice of the renormalization scheme.
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