Search of the Higgs boson decaying into tau-leptons at ATLAS

The search for the Higgs boson is one of the main goals of the Large Hadron Collider experiments. Both in the Standard Model (SM) and in its minimal supersymmetric extensions (MSSM), one or several new bosons are expected as manifestations of the Higgs field. The tau lepton will be essential for Higgs(es) discovery. In fact, both in SM and in the MSSM, the Higgs boson(s) decaying into tau-pairs is one of the favourite discovery channels, especially at low masses. The discovery potential of the ATLAS experiment for neutral Higgs bosons decaying into tau-pairs is shown both in the SM and the MSSM. For the latter, the results on the charged Higgs boson decaying into tau lepton plus neutrino are also discussed.