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A search for neutral high-mass Higgs bosons decaying into pairs of hadronically decaying tau leptons in 13 TeV collisions recorded by the ATLAS detector

This thesis outlines the search for neutral Higgs bosons in a mass range of m<sub>H/A</sub> = 200 GeV − 1.2 TeV, decaying to a pair of hadronically decaying tau leptons. The search is performed using &radic;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 m<sub>H/A</sub> = 200 GeV to 0.025 pb at m<sub>H/A</sub> = 1.2 TeV for a scalar boson produced via gluon-gluon fusion, and 1.6 pb at m<sub>H/A</sub> = 200 GeV to 0.028 pb at m<sub>H/A</sub> = 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 tan&beta;, 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 tan&beta; &LT; 7.6 for m<sub>A</sub> = 200 GeV, and tan&beta; &LT; 47 for m<sub>A</sub> = 1 TeV. For the mass range m<sub>A</sub> &GT; 500 GeV, the upper limit on tan&beta; is improved in comparison to previous ATLAS searches.

Identiferoai:union.ndltd.org:bl.uk/oai:ethos.bl.uk:730439
Date January 2016
CreatorsPickering, Mark Andrew
ContributorsHays, Chris
PublisherUniversity of Oxford
Source SetsEthos UK
Detected LanguageEnglish
TypeElectronic Thesis or Dissertation
Sourcehttps://ora.ox.ac.uk/objects/uuid:1d996f69-4aaa-421b-bf72-88ef5a0fbffc

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