Interpreting B-anomalies within an extended 331 gauge theory

TL;DR

This paper reinterprets B-anomalies within an extended 331 gauge theory, introducing new lepton species and charges to explain lepton flavor universality violation and neutrino masses.

Contribution

It proposes a novel 331 model with family-dependent lepton charges and additional neutral fermions, maintaining anomaly cancellation and addressing recent flavor anomaly data.

Findings

Model explains $R_{K^{(*)}}$ anomalies with lepton flavor universality violation.

Inclusion of neutral fermions accounts for small neutrino masses.

Model remains anomaly free despite extended particle content.

Abstract

In light of the recent $R_{K^{(*)}}$ data on neutral current flavour anomalies in $B \to K^{(*)} \ell^+ \ell^-$ decays, we re-examine their quantitative interpretation in terms of an extended 331 gauge theory framework. We achieve this by adding two extra lepton species with novel 331 charges, while ensuring that the model remains anomaly free. In contrast to the canonical 331 models, the gauge charges of the first and second lepton families differ from each other, allowing lepton flavour universality violation. We further expand the model by adding the neutral fermions required to provide an adequate description for small neutrino masses.