The E6 inspired isosinglet quark and the Higgs boson

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 → h d and D → 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 b ¯ channel becomes as efficient as the γγ channel for discovering the Higgs particle if m D 630 GeV .