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The feasibility of detecting a heavy charged Higgs boson,m(H^{+-})>m(t)+m(b), decaying in the H^{+-}->tb channel is studied with thefast simulation of the ATLAS detector. We study the gg->H^{+-}tb productionprocess at the LHC which together with the aforementioned decay channel leadsto four b-quarks in the final state. The whole production and decay chain readsgg->H^{+-}tb->t\bar{t}b\bar{b}->b\bar{b}b\bar{b}l\nu\bar{q}q'. Combinatorialbackground is a major difficulty in this multi-jet environment but can beovercome by employing multivariate techniques in the event reconstruction.Requiring four b-tagged jets in the event helps to effectively suppress theStandard Model backgrounds but leads to no significant improvement in thediscovery potential compared to analyses requiring only three b-tagged jets.This study indicates that charged Higgs bosons can be discovered at the LHC upto high masses (m(H^{+-})>400 GeV) in the case of large tan(beta)

The ATLAS discovery potential for a heavy charged Higgs boson in gg → tbH± with H± → tb