Gauged Two Higgs Doublet Model confronts the LHC 750 GeV di-photon anomaly

TL;DR

This paper explores how the Gauged Two Higgs Doublet Model can explain the 750 GeV diphoton anomaly at the LHC by introducing new heavy fermions and gauge bosons that enhance the diphoton signal.

Contribution

It proposes a specific extension of the Standard Model with an $SU(2)_H$ gauge symmetry to account for the LHC diphoton excess using new heavy fermions and scalar doublets.

Findings

The model can produce a diphoton signal consistent with the 750 GeV anomaly.

New heavy fermions circulate in loops to enhance the diphoton decay.

The scalar doublet can be produced via gluon fusion and decay into two photons.

Abstract

In light of the recent 750 GeV diphoton anomaly observed at the LHC, we study the possibility of accommodating the deviation from the standard model prediction based on the recently proposed Gauged Two Higgs Doublet Model. The model embeds two Higgs doublets into a doublet of a non-abelian gauge group $SU(2)_H$, while the standard model $SU(2)_L$ right-handed fermion singlets are paired up with new heavy fermions to form $SU(2)_H$ doublets, and $SU(2)_L$ left-handed fermion doublets are singlets under $SU(2)_H$. An $SU(2)_H$ scalar doublet, which provides masses to the new heavy fermions as well as the $SU(2)_H$ gauge bosons, can be produced via gluon fusion and subsequently decays into two photons with the new fermions circulating the triangle loops to account for the deviation from the standard model prediction.