Prospects to search for E6 isosinglet quarks in ATLAS

TL;DR

This paper explores the potential for the ATLAS detector at the LHC to discover new E6 isosinglet down-type quarks, focusing on their pair production and detection prospects based on simulated data.

Contribution

It provides a detailed simulation study of the detection prospects for E6 isosinglet down quarks at the LHC, including signal and background analysis with detector effects.

Findings

ATLAS can detect D quarks below 650 GeV in the first year.

Detection of D quarks up to 1 TeV is possible with three sigma significance after two years.

The study demonstrates the feasibility of discovering these quarks in upcoming LHC runs.

Abstract

We consider pair production of new down-type isosinglet quarks originating from E_{6}, which is the favorite gauge symmetry group in superstring inspired GUT models. The study concentrates on the possibility of observing the pair production of the lightest of the new quarks, D, in the ATLAS detector at the forthcoming LHC accelerator, in the channel D\bar{D}\to ZjZj . Both signal and background events are studied using tree level event generators based on Monte Carlo techniques. The detector effects are taken into account using the ATLAS fast simulation tool, ATLFAST. It is shown that ATLAS can observe the D quark within the first year of low luminosity LHC operation if its mass is less than 650 GeV. For the case of two years of full luminosity running, 1 TeV can be reached with about three sigma significance.