Heavy Charged MSSM Higgs Bosons in the H+- -> tb Decay in CMS 031

In this paper the prospects to discover a heavy charged MSSM Higgs boson in the H+- -> tb decay channel are presented, with the tagging of three b-quarks. The very large background from ttbar + jets, with real additional b-jets or a jet mistagged as b, is kinematically very similar to the signal. The study is performed with fast detector simulation. This analysis includes a dedicated background simulation, a study of HLT trigger acceptance, advanced b-tagging and reconstruction results, and an estimate of the influence of the systematic uncertainties on the background cross section. Furthermore, improvements are considered from the possible knowledge of the charged Higgs boson mass and exploiting the fully hadronic decay channel. The discovery reach is investigated and it is concluded that, with the present analysis, no visibility is left in the MSSM parameter space for this channel.