Radiative Corrections to W and Quark Propagators in the Resonance Region

Details Radiative Corrections to W and Quark Propagators in the Resonance Region Radiative Corrections to W and Quark Propagators in the Resonance Region

1998-07-02

arxiv.org/abs/hep-ph/9807218v1

Acta Phys.Polon. B29 (1998) 2901-2915

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 7 figures, LaTeX. Uses epsfig. Talk given at Zeuthen Workshop on Elementary Particle Theory: Loops and Legs in Gauge

Scientific paper

It is shown that conventional mass renormalization, when applied to photonic or gluonic corrections to unstable particle propagators, leads to non-convergent series in the resonance region. A solution of this problem, based on the concepts of pole mass and width, is presented. In contrast with the Z case, the conventional on-shell definition of mass for W bosons and unstable quarks contains an unbounded gauge dependence in next-to-leading order. The on-shell and pole definitions of width are shown to coincide if terms of O(\Gamma^2) and higher are neglected, but not otherwise.

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