Two Higgs doublets to explain the excesses $pp\rightarrow \gamma\gamma(750\ {\rm GeV})$ and $h \to \tau^\pm \mu^\mp$

TL;DR

This paper proposes a two Higgs doublet model with added vector-like fermions to simultaneously explain the 750 GeV diphoton excess and the lepton flavor violating decay of the 125 GeV Higgs, consistent with experimental constraints.

Contribution

It introduces a minimal two Higgs doublet framework with vector-like fermions to account for both anomalies and aligns with existing Higgs and electroweak data.

Findings

Parameter space exists that explains both excesses

Model remains consistent with Higgs and electroweak precision measurements

Additional matter enhances the diphoton rate

Abstract

The two Higgs doublet model emerges as a minimal scenario in which to address, at the same time, the $\gamma\gamma$ excess at 750 GeV and the lepton flavour violating decay into $\tau^\pm \mu^\mp $ of the 125 GeV Higgs boson. The price to pay is additional matter to enhance the $\gamma\gamma$ rate, and a peculiar pattern for the lepton Yukawa couplings. We add TeV scale vector-like fermions and find parameter space consistent with both excesses, as well as with Higgs and electroweak precision observables.