LHC EFT WG Note: Basis for Anomalous Quartic Gauge Couplings

TL;DR

This paper establishes a comprehensive basis for dimension-eight operators responsible for anomalous quartic gauge couplings in electroweak interactions, clarifying CP properties and providing a foundation for future experimental and theoretical studies.

Contribution

It introduces a definitive operator basis for anomalous quartic gauge couplings, distinguishing CP-even and CP-odd operators, which aids in standardizing analyses in this area.

Findings

Defines a complete basis for dimension-eight aQGC operators

Distinguishes CP-even and CP-odd operator sets

Provides a reference for experimental constraints

Abstract

In this note, we give a definitive basis for the dimension-eight operators leading to quartic -- but no cubic -- interactions among electroweak gauge bosons. These are often called anomalous quartic gauge couplings, or aQGCs. We distinguish in particular the CP-even ones from their CP-odd counterparts.