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Title: Searching for new high mass resonances in the dielectron channel, using the ATLAS detector at CERN
Author: Hayden, Daniel
Awarding Body: Royal Holloway, University of London
Current Institution: Royal Holloway, University of London
Date of Award: 2012
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A search is conducted in the dielectron channel for beyond the Standard Model high mass neutral resonances, such as E6 motivated Z′ states and the Randall-Sundrum Graviton. The data in this thesis was recorded by the ATLAS detector during proton-proton collisions in 2011 at √s = 7 TeV, provided by the Large Hadron Collider at CERN in Geneva, Switzerland. The dataset used constitutes a total integrated luminosity of 2.12 fb−1 after data quality checks. The dielectron channel result is presented and combined with the equivalent 1.21 fb−1 dimuon channel result for the Z′. Additionally these results are combined with the 2.12 fb−1 diphoton channel result for the RS Graviton. The greatest excess in the dielectron channel is observed at 580 GeV with a significance of 1.34 σ. Therefore as no significant excess is observed in data above the Standard Model expectation, exclu- sion limits are set at 95% confidence level on the cross section times branching ratio for various signal scenarios as a function of resonance mass. A combined lower mass limit of 1.96 TeV is set on the ZS′ SM, and 1.95 TeV for a Randall-Sundrum Graviton with k/MPl = 0.10. These limits represent the world's highest observed mass exclusion for the models considered, at the time of writing this thesis.
Supervisor: Berry, Tracey Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available