Title: Helicity formalism revisited for polarised particle decays
Abstract:We discuss a revision of the helicity formalism in light of its application to multi-body decays involving polarised particles, notably fermions. The issue of the phase definition for helicity states ...We discuss a revision of the helicity formalism in light of its application to multi-body decays involving polarised particles, notably fermions. The issue of the phase definition for helicity states is clarified and solved by proposing a slight modification of the helicity formalism. We present a method to write helicity amplitudes with a consistent matching of final particle spin states valid for fermions as well. The need for the proposed revision of the helicity formalism is stressed by considering the consequences of an improper phase definition of spin states on the decay distributions of polarised particles.Read More
Publication Year: 2019
Publication Date: 2019-11-22
Language: en
Type: preprint
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