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AbstractAbstract
[en] Charged Higgs bosons are predicted in theories with a non-minimal Higgs sector like the Minimal Supersymmetric Extension of the Standard Model (MSSM). At the LHC, light charged Higgs Bosons might be produced in on-shell top quark decays t→ H+b, if mH±t-mb. In most of the MSSM parameter space, the decay H+ → τν is the dominant decay channel and suggests the possibility of using the unique signature of hadronic τ final states to suppress the backgrounds. The subject of this study is the estimation of the sensitivity of the ATLAS detector for charged Higgs boson searches in t anti t events. Leptons from the decay chain of the second top quark allow for efficient triggering. A search strategy is developed and estimates of signal significances and exclusion limits in the MSSM mh-max scenario are presented based on Monte Carlo simulations. For an integrated luminosity of 10 fb-1, the discovery of charged Higgs bosons is possible for tanβ>32. Exclusion limits are given for values of tanβ>17, significantly improving the current best limits from the Tevatron. The most important systematic uncertainties were found to be the errors on the jet energy scale and the missing transverse energy, resulting in a total systematic uncertainty of 40% on the signal. To reduce the systematic uncertainty for the most important Standard Model background, t anti t production, emphasis is put on estimating this background using data instead of Monte Carlo simulations. The t anti t background consists of two contributions, one with a correctly identified τ-jet in the final state, which is irreducible, and one where the hadronic τ decay is faked by a light parton jet. For each background a method has been developed to estimate its contribution with minimal use of Monte Carlo simulations. In this way, the systematic uncertainty on the background can be significantly reduced. (orig.)
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Source
7 Jul 2010; 173 p; Diss. (Dr.rer.nat.)
Record Type
Miscellaneous
Literature Type
Thesis/Dissertation
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BACKGROUND RADIATION, CERN LHC, COMPUTERIZED SIMULATION, COUNTING TECHNIQUES, HIGGS BOSONS, JET MODEL, LEPTONIC DECAY, MONTE CARLO METHOD, MULTIPLE PRODUCTION, PAIR PRODUCTION, PARTICLE PRODUCTION, PROTON-PROTON INTERACTIONS, SEMILEPTONIC DECAY, SENSITIVITY, STANDARD MODEL, SUPERSYMMETRY, T ANTIQUARKS, TAU PARTICLES, TEV RANGE, TRANSVERSE ENERGY
ACCELERATORS, ANTIMATTER, ANTIPARTICLES, ANTIQUARKS, BARYON-BARYON INTERACTIONS, BASIC INTERACTIONS, BOSONS, CALCULATION METHODS, CYCLIC ACCELERATORS, DECAY, ELEMENTARY PARTICLES, ENERGY, ENERGY RANGE, FERMIONS, FIELD THEORIES, GRAND UNIFIED THEORY, HADRON-HADRON INTERACTIONS, HEAVY LEPTONS, INTERACTIONS, KINETIC ENERGY, LEPTONS, MATHEMATICAL MODELS, MATTER, NUCLEON-NUCLEON INTERACTIONS, PARTICLE DECAY, PARTICLE INTERACTIONS, PARTICLE MODELS, PARTICLE PRODUCTION, POSTULATED PARTICLES, PROTON-NUCLEON INTERACTIONS, QUANTUM FIELD THEORY, QUARKS, RADIATIONS, SIMULATION, STORAGE RINGS, SYMMETRY, SYNCHROTRONS, T QUARKS, TOP PARTICLES, UNIFIED GAUGE MODELS, WEAK INTERACTIONS, WEAK PARTICLE DECAY
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