Implication of the 750 GeV diphoton resonance on two-Higgs-doublet model and its extensions with Higgs field

TL;DR

This paper investigates the 750 GeV diphoton resonance within two-Higgs-doublet models, extending the model with additional Higgs fields to explain the observed excess at the LHC.

Contribution

It introduces two extensions of the two-Higgs-doublet model with additional Higgs fields to account for the 750 GeV diphoton resonance, achieving production rates consistent with LHC observations.

Findings

The original two-Higgs-doublet model cannot produce sufficient diphoton resonance.

Adding an inert complex Higgs triplet enhances the rate to 0.6 fb.

Adding a real scalar septuplet enhances the rate to 4.5 fb, matching LHC data.

Abstract

We examine the implication of the 750 GeV diphoton resonance on the two-Higgs-doublet model imposing various theoretical and experimental constraints. The production rate of two-Higgs-doublet model is smaller than the cross section observed at the LHC by two order magnitude. In order to accommodate the 750 GeV diphoton resonance, we extend the two-Higgs-doublet model by introducing additional Higgs fields, and focus on two different extensions, an inert complex Higgs triplet and a real scalar septuplet. With the 125 GeV Higgs being agreement with the observed data, the production rate for the 750 GeV diphoton resonance can be enhanced to 0.6 fb for the former and 4.5 fb for the latter. The results of the latter are well consistent with the 750 GeV diphoton excess at the LHC.