# A 96 GeV Higgs Boson in the N2HDM

## TL;DR

This paper explores the possibility that a 96 GeV Higgs boson observed as excesses in CMS and LEP data can be explained within the N2HDM framework, fitting both signals simultaneously while remaining consistent with other experimental constraints.

## Contribution

It demonstrates that the N2HDM, specifically types II and IV, can simultaneously explain the 96 GeV excesses and align with existing Higgs measurements and bounds.

## Key findings

- The lightest Higgs in N2HDM can fit both CMS and LEP excesses.
- The second lightest Higgs is consistent with the 125 GeV Higgs measurements.
- N2HDM types II and IV are capable of explaining the observed signals.

## Abstract

We discuss a $\sim 3\,\sigma$ signal (local) in the light Higgs-boson search in the diphoton decay mode at $\sim 96$ GeV as reported by CMS, together with a $\sim 2\,\sigma$ excess (local) in the $b \bar b$ final state at LEP in the same mass range. We interpret this possible signal as a Higgs boson in the 2 Higgs Doublet Model with an additional real Higgs singlet (N2HDM). We find that the lightest Higgs boson of the N2HDM can perfectly fit both excesses simultaneously, while the second lightest state is in full agreement with the Higgs-boson measurements at 125 GeV, and the full Higgs-boson sector is in agreement with all Higgs exclusion bounds from LEP, the Tevatron and the LHC as well as other theoretical and experimental constraints. We show that only the N2HDM type II and IV can fit both the LEP excess and the CMS excess with a large ggF production component at $\sim 96$ GeV. We derive bounds on the N2HDM Higgs sector from a fit to both excesses and describe how this signal can be further analyzed at the LHC and at future $e^+e^-$ colliders, such as the ILC.