ATLAS Diboson Excesses from the Stealth Doublet Model

TL;DR

This paper explains the ATLAS diboson excesses around 2 TeV using a modified stealth doublet model with a heavy Higgs boson that interacts with first-generation quarks, fitting collider constraints.

Contribution

It introduces a stealth doublet model with specific Yukawa interactions and mixing angles to account for the diboson excesses observed by ATLAS.

Findings

Heavy CP-even Higgs can explain WW and ZZ excesses

Model satisfies collider and electroweak constraints

Small Yukawa coupling and mixing angle are sufficient

Abstract

The ATLAS collaboration has reported excesses in diboson invariant mass searches of new resonances around 2 TeV, which might be a prediction of new physics around that mass range. We interpret these results in the context of a modified stealth doublet model where the extra Higgs doublet has a Yukawa interaction with the first generation quarks, and show that the heavy CP-even Higgs boson can naturally explain the excesses in the WW and ZZ channels with a small Yukawa coupling, \xi\sim 0.15, and a tiny mixing angle with the SM Higgs boson, \alpha \sim 0.06. Furthermore, the model satisfy constraints from colliders and electroweak precision measurements.