Precision electroweak experiments and heavy physics: A global analysis

Abstract

The radiative corrections of heavy degenerate and nondegenerate electroweak multiplets do not decouple from low-energy experiments. Their effects can be parametrized in a general renormalization-scheme-independent way. For isospin-breaking ${\mathit{h}}_{\mathit{V}}$ and chiral-breaking ${\mathit{h}}_{\mathit{A}\mathit{Z}}$ and ${\mathit{h}}_{\mathit{A}\mathit{W}}$, derived from the Z and W self-energies, a global analysis of existing neutral-current and Z and W data yields -1.2${\mathit{h}}_{\mathit{V}}$${\mathit{h}}_{\mathit{A}\mathit{Z}}$${\mathit{h}}_{\mathit{A}\mathit{W}}$