Search for Neutral Higgs Bosons of the MSSM decaying to τhad τhad in proton-proton collisions at √s = 8 TeV with the ATLAS detector
Search for Neutral Higgs Bosons of the MSSM decaying to τhad τhad in proton-proton collisions at √s = 8 TeV with the ATLAS detector
dc.contributor.advisor | Dingfelder, Jochen Christian | |
dc.contributor.author | Scutti, Federico | |
dc.date.accessioned | 2020-04-22T22:01:04Z | |
dc.date.available | 2020-04-22T22:01:04Z | |
dc.date.issued | 21.11.2016 | |
dc.identifier.uri | https://hdl.handle.net/20.500.11811/6874 | |
dc.description.abstract | A search for the neutral Higgs bosons predicted by the Minimal Supersymmetric Standard Model, h, H and A, is presented in this thesis. It is based on a data sample with an integrated luminosity of Lint = 19:5 fb-1 from proton-proton collisions with a center-of-mass energy of √s = 8 TeV produced at the LHC and recorded by the ATLAS experiment in 2012. The search is performed in the decay channel with two tau leptons decaying hadronically, h/H/A → τhad τhad. The selection of events is based on the kinematic and topological properties of a heavy neutral Higgs boson produced by bb annihilation and the gluon-gluon fusion production mechanisms. The search significantly improves upon the sensitivity of previous searches, and leads the sensitivity of the h/H/A → ττ combined search, where other tau decay modes are selected in the final state, for signal masses mA >∼ 350 GeV. As no significant excess is found, exclusion limits are set in the space of the two leading-order free parameters of the MSSM, mA and tanβ. After the discovery of a Higgs boson in 2012, with a mass of mH = 125.09 ± 0.24 GeV, new phenomenological scenarios of the MSSM were proposed. In this search, exclusion limits are obtained for these various scenarios in the mass range mA = 170 - 1000 GeV. Model-independent exclusion limits were also obtained for the cross-section of the production of a generic resonance, φ, by bb annihilation and gluon-gluon fusion. Excluded cross-sections at 95% confidence level are as high as σexcl.(bb→ φ → ττ) ≈ 4.2 pb and σexcl.(gg →∅→ ττ) ≈ 6.8 pb at mφ = 170 GeV and σexcl.(bb → φ → ττ) ≈ 9.2 fb and σexcl.(gg → φ → ττ) ≈10 fb at m∅ = 1000 GeV. | |
dc.language.iso | eng | |
dc.relation.ispartofseries | BONN-IR ; 2016-04 | |
dc.rights | In Copyright | |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject.ddc | 530 Physik | |
dc.title | Search for Neutral Higgs Bosons of the MSSM decaying to τhad τhad in proton-proton collisions at √s = 8 TeV with the ATLAS detector | |
dc.type | Dissertation oder Habilitation | |
dc.publisher.name | Universitäts- und Landesbibliothek Bonn | |
dc.publisher.location | Bonn | |
dc.rights.accessRights | openAccess | |
dc.identifier.urn | https://nbn-resolving.org/urn:nbn:de:hbz:5n-44617 | |
ulbbn.pubtype | Erstveröffentlichung | |
ulbbnediss.affiliation.name | Rheinische Friedrich-Wilhelms-Universität Bonn | |
ulbbnediss.affiliation.location | Bonn | |
ulbbnediss.thesis.level | Dissertation | |
ulbbnediss.dissID | 4461 | |
ulbbnediss.date.accepted | 15.07.2016 | |
ulbbnediss.institute | Mathematisch-Naturwissenschaftliche Fakultät : Fachgruppe Physik/Astronomie / Physikalisches Institut (PI) | |
ulbbnediss.fakultaet | Mathematisch-Naturwissenschaftliche Fakultät | |
dc.contributor.coReferee | Desch, Klaus |
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