Second-order Z0 boson leg loop corrections in the decay of Z0 boson to Leptons

Abstract

We extend the standard tree-level calculations of the Z⁰ boson decay rate into leptons to include second-order radiative corrections in the Z⁰ boson external leg. Two diagrams, consisting of the Z⁰ self-energy and the Z⁰ → γ transition, have been taken into account. We used dimensional regularization techniques to calculate the Feynman amplitude involving ultraviolet divergent loop integrals then incorporate the necessary loop corrections inside the decay rate formulae.