A basis of dimension-eight operators for anomalous neutral triple gauge boson interactions

TL;DR

This paper identifies four dimension-eight operators responsible for anomalous neutral triple gauge boson interactions, analyzing their effects and interference with the Standard Model, highlighting the small impact due to polarization mismatches.

Contribution

It introduces a basis of four independent dimension-eight operators for neutral triple gauge interactions, clarifying their CP properties and interference effects with the Standard Model.

Findings

Only the CP-even operator interferes with the SM.

Effects are tiny due to polarization mismatch.

Interference with SM is limited to the CP-even operator.

Abstract

Four independent dimension-eight operators give rise to anomalous neutral triple gauge boson interactions, one CP-even and three CP-odd. Only the CP-even operator interferes with the Standard Model for the production of a pair of on-shell neutral bosons. However, the effects are found to be tiny due mainly to the mismatch of the Z boson polarization between the productions from the SM and the new operator.