96 GeV Scalar Boson in the 2HDM with U(1)_H Gauge Symmetry

TL;DR

This paper explores a two Higgs doublet model with an additional U(1)_H gauge symmetry to explain the 96 GeV scalar boson signals observed by CMS, incorporating anomaly cancellation and extra fermions.

Contribution

It introduces a novel 2HDM with gauged U(1)_H symmetry, addressing flavor issues and anomaly cancellation, and analyzes its compatibility with experimental excesses.

Findings

The model can accommodate the 96 GeV resonance signals.

Extra fermions influence the resonance signals and are consistent with anomaly cancellation.

The proposed model aligns with CMS excess observations.

Abstract

In this paper, we study two Higgs doublet models with gauged U(1)_H symmetry, motivated by the excesses around 96 GeV reported by the CMS collaboration in the searches for light resonances decaying to two photons and two \tau's. In this model, one Higgs doublet field is charged under the U(1)_H symmetry to avoid tree-level flavor changing neutral currents. The extra gauge symmetry requires extra chiral fermions, to satisfy the anomaly-free conditions. We analyze the signals of the light resonances, taking into account the contribution of the extra fermions, and discuss the consistency with the experimental results in this model.