Search for charged Higgs bosons in ATLAS

Charged Higgs bosons are predicted in several extensions of the Standard Model, where there is more than one doublet of complex scalars in the Higgs sector, for instance Two-Higgs-Doublet Models (2HDM), which is also the case in the Minimal Supersymmetric Standard Model (MSSM). For m(H+) < m(top), the dominant production mode for charged Higgs bosons at the LHC is via the decay t -> bH+ of one of the top quarks in ttbar events. We present results on the search for such light charged Higgs bosons in the ATLAS experiment, with emphasis on the decays H+ -> tau+nu.