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Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC

Searches for charged Higgs bosons decaying to a tau lepton and a neutrino in fully hadronic final states are presented in this thesis. The analyses are based on 4.6fb$^{-1}$ and 19.5fb$^{-1}$ of proton-proton collision data taken with the ATLAS detector at the LHC at center-of-mass energies of 7TeV...

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Autor principal: Kopp, Anna
Lenguaje:eng
Publicado: 2015
Materias:
Acceso en línea:http://cds.cern.ch/record/2112091
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author Kopp, Anna
author_facet Kopp, Anna
author_sort Kopp, Anna
collection CERN
description Searches for charged Higgs bosons decaying to a tau lepton and a neutrino in fully hadronic final states are presented in this thesis. The analyses are based on 4.6fb$^{-1}$ and 19.5fb$^{-1}$ of proton-proton collision data taken with the ATLAS detector at the LHC at center-of-mass energies of 7TeV and 8TeV in 2011 and 2012, respectively. Charged Higgs bosons with masses less than the top quark mass are searched for in events consistent with top-quark pair production and charged Higgs bosons with masses greater than the top quark mass are searched for in associated production with a top quark. In the search based on data taken in 2011, all background contributions are estimated in data-driven ways. Only a minor background contribution is estimated using simulation in the searches based on data taken in 2012; all dominant background contributions are estimated using data-driven methods here as well. An embedding method is used in all searches to assess the dominant and irreducible background contributions containing true hadronically decaying tau leptons and described in detail in this thesis. No significant excess of the data compared to the background expectations due to Standard Model processes is observed. Statistical analyses lead to 95% confidence-level upper limits on the branching ratios $B(t\rightarrow bH^\pm)\times B(H^\pm\rightarrow\tau^\pm\nu)$ between 0.23% and 1.3% for charged Higgs boson masses between 80GeV and 160GeV and on the production cross section times branching ratio, $\sigma(pp\rightarrow tH^\pm+X)\times B(H^\pm\rightarrow\tau^\pm \nu)$ ranging from 0.76pb to 4.5fb for charged Higgs boson masses between 180GeV and 1000GeV. The branching ratio and cross section limits are used to derive constraints on the parameter space of minimal supersymmetric extensions of the Standard Model in various benchmark scenarios. These limits are the so far strictest limits set by the ATLAS collaboration in the search for charged Higgs bosons in fully hadronic final states.
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spelling cern-21120912019-09-30T06:29:59Zhttp://cds.cern.ch/record/2112091engKopp, AnnaSearch for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHCParticle Physics - ExperimentSearches for charged Higgs bosons decaying to a tau lepton and a neutrino in fully hadronic final states are presented in this thesis. The analyses are based on 4.6fb$^{-1}$ and 19.5fb$^{-1}$ of proton-proton collision data taken with the ATLAS detector at the LHC at center-of-mass energies of 7TeV and 8TeV in 2011 and 2012, respectively. Charged Higgs bosons with masses less than the top quark mass are searched for in events consistent with top-quark pair production and charged Higgs bosons with masses greater than the top quark mass are searched for in associated production with a top quark. In the search based on data taken in 2011, all background contributions are estimated in data-driven ways. Only a minor background contribution is estimated using simulation in the searches based on data taken in 2012; all dominant background contributions are estimated using data-driven methods here as well. An embedding method is used in all searches to assess the dominant and irreducible background contributions containing true hadronically decaying tau leptons and described in detail in this thesis. No significant excess of the data compared to the background expectations due to Standard Model processes is observed. Statistical analyses lead to 95% confidence-level upper limits on the branching ratios $B(t\rightarrow bH^\pm)\times B(H^\pm\rightarrow\tau^\pm\nu)$ between 0.23% and 1.3% for charged Higgs boson masses between 80GeV and 160GeV and on the production cross section times branching ratio, $\sigma(pp\rightarrow tH^\pm+X)\times B(H^\pm\rightarrow\tau^\pm \nu)$ ranging from 0.76pb to 4.5fb for charged Higgs boson masses between 180GeV and 1000GeV. The branching ratio and cross section limits are used to derive constraints on the parameter space of minimal supersymmetric extensions of the Standard Model in various benchmark scenarios. These limits are the so far strictest limits set by the ATLAS collaboration in the search for charged Higgs bosons in fully hadronic final states.CERN-THESIS-2015-238oai:cds.cern.ch:21120912015-12-09T13:25:42Z
spellingShingle Particle Physics - Experiment
Kopp, Anna
Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title_full Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title_fullStr Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title_full_unstemmed Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title_short Search for charged Higgs bosons decaying via $H^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the ATLAS detector at the LHC
title_sort search for charged higgs bosons decaying via $h^\pm \rightarrow \tau^\pm\nu$ in fully hadronic final states with the atlas detector at the lhc
topic Particle Physics - Experiment
url http://cds.cern.ch/record/2112091
work_keys_str_mv AT koppanna searchforchargedhiggsbosonsdecayingviahpmrightarrowtaupmnuinfullyhadronicfinalstateswiththeatlasdetectoratthelhc