Signatures of the anomalous $Z\gamma$ and ZZ production at the lepton and hadron Colliders

TL;DR

This paper investigates potential new physics effects in neutral gauge boson interactions, analyzing their signatures at various colliders and proposing a model to guide experimental tests and constraints.

Contribution

It provides a comprehensive analysis of anomalous ZZZ, ZZγ, and Zγγ couplings at different colliders, introducing a theoretical model to predict relations among these couplings.

Findings

Experimental limits on neutral couplings are compiled.

A theoretical model predicts specific relations among couplings.

Guidance for future collider tests of new physics interactions.

Abstract

The possible form of New Physics (NP) interactions affecting the ZZZ, $ZZ \gamma$ and $Z\gamma \gamma$ vertices, is critically examined. Their signatures and the possibilities to study them, through ZZ and $Z\gamma$ production, at the e^-e^+ Colliders LEP and LC and at the hadronic Colliders Tevatron and LHC, are investigated. Experimental limits obtained or expected on each coupling are collected. A simple theoretical model based on virtual effects due to some heavy fermions is used for acquiring some guidance on the plausible forms of these NP vertices. In such a case specific relations among the various neutral couplings are predicted, which can be experimentally tested and possibly used to constrain the form of the responsible NP structure.