LHC diphoton Higgs signal and top quark forward-backward asymmetry in quasi-inert Higgs doublet model

TL;DR

This paper investigates how the quasi-inert Higgs doublet model can simultaneously enhance the Higgs diphoton decay rate at the LHC and explain the top quark forward-backward asymmetry at Tevatron, considering various experimental constraints.

Contribution

It demonstrates that the quasi-inert Higgs doublet model can account for both phenomena with specific Higgs contributions, expanding beyond the standard model.

Findings

Higgs diphoton rate can be enhanced by light charged Higgs

Top quark asymmetry can be explained within 1σ by neutral Higgs contributions

Correlations between Higgs decay and top asymmetry are analyzed

Abstract

In the quasi-inert Higgs doublet model, we study the LHC diphoton rate for a standard model-like Higgs boson and the top quark forward-backward asymmetry at Tevatron. Taking into account the constraints from the vacuum stability, unitarity, electroweak precision tests, flavor physics and the related experimental data of top quark, we find that compared with the standard model prediction, the diphoton rate of Higgs boson at LHC can be enhanced due to the light charged Higgs contributions, while the measurement of the top quark forward-backward asymmetry at Tevatron can be explained to within $1\sigma$ due to the non-standard model neutral Higgs bosons contributions. Finally, the correlations between the two observables are discussed.