Search for heavy Higgs bosons decaying into two tau leptons in the LHC-ATLAS experiment

Supersymmetry is one of the most motivated extensions of the SM. It requires the Higgs sector of the SM to be extended with at least one additional Higgs doublets, resulting in five physical Higgs states. The search for heavy Higgs bosons decaying to two tau leptons uses 139 fb−1 of proton-proton collisions at a center-of-mass energy of sqrt(s)=13 TeV recorded by the ATLAS detector at the Large Hadron Collider. The result confirms no significant excess from SM prediction. An exclusion limit at the 95% confidence level in the context of the hMSSM scenario is presented. This talk will focus on the analysis methods including signal extraction, background estimation, and improvements in the search.