Anomalous and axial Z' contributions to g-2

TL;DR

This paper investigates how an anomalous Z' boson with axial couplings influences the muon's anomalous magnetic moment, identifying parameter regions where new physics could be experimentally accessible.

Contribution

It analyzes the combined one-loop and two-loop effects of anomalous Z' couplings on (g-2), highlighting scenarios with significant contributions and potential collider signatures.

Findings

Anomalous Z' can produce dominant contributions to (g-2) in certain parameter regions.

Low cutoff scales imply the existence of new charged fermions detectable in future colliders.

String theory orientifold models can realize the studied anomalous Z' scenarios.

Abstract

We study the effects of an anomalous Z' boson on the anomalous magnetic moment of the muon (g-2), and especially the impact of its axial coupling. We mainly evaluate the negative contribution to (g-2) of such couplings at one-loop and look at the anomalous couplings generated at two loops. We find areas of the parameter space, where the anomalous contribution becomes comparable and even dominant compared to the one-loop contribution. We show that in such cases, the cutoff of the theory is sufficiently low, so that new charged fermions can be found in the next round of collider experiments. We comment on the realization of such a context in string theory orientifolds.