| Summary: | <p>This thesis outlines the search for neutral Higgs bosons in a mass range of <em>m<sub>H/A</sub></em> = 200 GeV − 1.2 TeV, decaying to a pair of hadronically decaying tau leptons. The search is performed using √s = 13 TeV proton-proton collision data, corresponding to an integrated luminosity of 3.21 fb<sup>−1</sup>, recorded by the ATLAS detector. No excess over the predicted Standard Model background is observed and upper limits are placed on the production cross section times branching fraction as a function of the mass of the scalar resonance. When combined with the results of the analysis where one of the tau leptons decays to either a muon or electron, the 95% confidence level upper limit on the cross section times branching fraction ranges from 1.4 pb at <em>m<sub>H/A</sub></em> = 200 GeV to 0.025 pb at <em>m<sub>H/A</sub></em> = 1.2 TeV for a scalar boson produced via gluon-gluon fusion, and 1.6 pb at <em>m<sub>H/A</sub></em> = 200 GeV to 0.028 pb at <em>m<sub>H/A</sub></em> = 1.2 TeV for a scalar boson produced via b-associated production. The results are interpreted in the Minimal Supersymmetric extension to the Standard Model (MSSM) as a limit on the value of tanβ, as a function of the mass of the neutral CP-odd MSSM Higgs boson. In the mmod+ scenario, the 95% confidence level upper limit is tanβ &LT; 7.6 for <em>m<sub>A</sub></em> = 200 GeV, and tanβ &LT; 47 for <em>m<sub>A</sub></em> = 1 TeV. For the mass range <em>m<sub>A</sub></em> &GT; 500 GeV, the upper limit on tanβ is improved in comparison to previous ATLAS searches.</p>
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