Pole Mass, Width, and Propagators of Unstable Fermions

Details Pole Mass, Width, and Propagators of Unstable Fermions Pole Mass, Width, and Propagators of Unstable Fermions

2008-01-04

arxiv.org/abs/0801.0669v1

Phys.Rev.D77:116012,2008

Physics

High Energy Physics

High Energy Physics - Theory

9 pages

Scientific paper

10.1103/PhysRevD.77.116012

The concepts of pole mass and width are extended to unstable fermions in the general framework of parity-nonconserving gauge theories, such as the Standard Model. In contrast with the conventional on-shell definitions, these concepts are gauge independent and avoid severe unphysical singularities, properties of great importance since most fundamental fermions in nature are unstable particles. General expressions for the unrenormalized and renormalized dressed propagators of unstable fermions and their field-renormalization constants are presented.

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