Modifying the Dyson Series for Unstable Particles and Resonances

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.

References in corpus (3)

• Single-top hadroproduction in association with a W boson
• The complex-mass scheme for perturbative calculations with unstable particles
• Neutralino-stop co-annihilation into electroweak gauge and Higgs bosons at one loop