Down type isosinglet quarks in ATLAS

Abstract

We evaluate the discovery reach of the ATLAS experiment for down type isosinglet quarks, D, using both their neutral and charged decay channels, namely the process pp -> D (D) over bar +X with subsequent decays resulting in 2l + 2j +E-T, 3l + 2j + E-T and 2l + 4j final states. The integrated luminosity required for observation of a heavy quark is estimated for a mass range between 600 and 1000 GeV using the combination of results from different search channels.