The E6 inspired isosinglet quark and the Higgs boson

TL;DR

This paper explores how a hypothetical isosinglet quark from the E6 model could influence Higgs boson detection at the LHC, showing that certain decay channels could enhance discovery prospects for a light Higgs.

Contribution

It analyzes the LHC signatures of the E6-inspired isosinglet quark D and its impact on Higgs search strategies, highlighting potential improvements in detection channels.

Findings

D quark pair production can lead to Higgs signatures at the LHC.

The $b\bar{b}$ channel becomes as effective as $\gamma\gamma$ for Higgs discovery if $m_D<630$ GeV.

Higgs detection prospects are enhanced by the presence of the D quark.

Abstract

We consider the experimental implications of the down type isosinglet quark, $D$, predicted by the $E_{6}$, group to Higgs boson searches at the LHC. The pair production of $D$ quarks at the LHC and their subsequent decays $D\to h d$ and $D\to W u$ has been analyzed. For a light Higgs boson of mass O(120 GeV), an analysis based on fast simulation of the ATLAS detector response shows that, the $b\bar{b}$ channel becomes as efficient as the $\gamma\gamma$ channel for discovering the Higgs particle if $m_{D}<630$ GeV.