The ATLAS discovery potential for a heavy charged Higgs boson ingg?tbH± withH± ?tb.

The feasibility of detecting a heavy charged Higgs boson,m _H±>m _t+m _b, decaying in theH^±?tbchannel is studied with the fast simulation of the ATLAS detector. We study thegg?H^± tbproduction process at the LHC which together with the aforementioned decay channel leads to fourb-quarks in the final state. The whole production and decay chain reads. Combinatorial background is a major difficulty in this multi-jet environment but can be overcome by employing multivariate techniques in the event reconstruction. Requiring fourb-tagged jets in the event helps to effectively suppress the Standard Model backgrounds but leads to no significant improvement in the discovery potential compared to analyses requiring only threeb-tagged jets. This study indicates that charged Higgs bosons can be discovered at the LHC up to high masses (m _H±>400 GeV) in the case of large tanß.Keywords:charged Higgs; MSSMPACS:14.80.Cp - 12.60.Jv - 11.10.Kk [ABSTRACT FROM AUTHOR]