2 TeV Higgs boson and diboson excess at the LHC

TL;DR

This paper proposes that a heavy Higgs boson within an extended two-Higgs-doublet model could explain the 2 TeV diboson excess observed at the LHC, highlighting the model's ability to produce the necessary resonance cross section.

Contribution

The paper demonstrates that a heavy neutral or charged Higgs in an extended two-Higgs-doublet model can account for the 2 TeV diboson excess, including novel decay channels involving pseudoscalar A^0.

Findings

Large Yukawa coupling to first-generation quarks is achievable in THD.

Resonance production cross section of 0.06-0.2 is attainable.

Diboson excess can also originate from $ZA^0$ or $WA^0$ channels.

Abstract

Diboson resonance with mass around 2 TeV in the dijet invariant mass spectrum is reported by ATLAS experiment in proton-proton collisions at $\sqrt{s}=8$ TeV. We propose that the candidate of resonance is a heavy neutral Higgs $H^0$ or charged Higgs $H^\pm$ and use the extended two-Higgs-doublet (THD) to demonstrate the potentiality. We find that the large Yukawa coupling to the first generation of quarks can be realized in THD and the required value for producing the right resonance production cross section is of ${\cal O}(0.06-0.2)$. Besides $WW/ZZ$ channels, we find that if the mass of pseudoscalar $A^0$ satisfies the jet mass tagging condition $|m_j - m_{Z/W}|< 13$ GeV, the diboson excess could be also caused by $ZA^0$ or $WA^0$ channel.