The observation of one or several Higgs bosons will be fundamental for the understanding of the electroweak symmetry breaking mechanism. In the Standard Model (SM), one scalar doublet is responsible for the electroweak symmetry breaking, leading to the prediction of a single Higgs boson. The simplest extension to the SM Higgs sector is the two Higgs doublet model present in many extensions to the SM itself, including supersymmetry. In such models, symmetry breaking leads to five Higgs particles, three neutral and a charged pair. The sensitivity of the ATLAS detector to the discovery of the charged Higgs has been studied in detail. In this paper, we discuss the expected precisions on the charged Higgs mass and \tan \beta measurements at the Large Hadron Collider (LHC).

PACS numbers: 12.60.Jv, 14.80.Cp