Search for Light Charged Higgs Bosons in Hadronic Tau Final States with the ATLAS Detector

The discovery potential of the ATLAS experiment at the Large Hadron Collider for charged Higgs bosons in top quark decays $t\rightarrow H^+b$ with subsequent decays $H^+→\tau\nu$ has been investigated for hadronic $\tau$ final states as predicted by the Minimal Supersymmetric Extension of the Standard Model. Emphasis is put on the data-driven estimation of the dominant background of top-antitop events.