Search for beyond Standard Model physics with same-sign dileptons

Summary, in English

An introduction into the theory and experimental background of particle physics and the ATLAS

detector is given. The transition radiation tracker (TRT) which is vital to the particle tracking

and identification is then described giving particular creedence to the calibration. The automation

of this calibration is explained. The second half of this thesis and the central part dwells on the

analyses searching for beyond Standard model physics at the ATLAS detector using same-sign

dilepton pairs (e±e±, e±μ± , μ±μ± ) during both the 7 TeV and 8 TeV data taking periods at the

Large Hadron Collider (LHC). In both searches no significant excess from the standard model

(SM) was seen. Limits were set on the fiducial cross-section for new physics as a function of

invariant mass. Exclusion limits are also derived for a specific model of doubly charged higgs

boson production and are seen to improve from the 7 TeV analysis to the 8 TeV analysis.

• Author: Anthony Hawkins
• Department/s: Particle and nuclear physics
• Publishing year: 2014
• Language: English
• Full text: - 35 MB; Download statistics
• Document type: Dissertation
• Publisher: Department of Physics, Lund University
• Topic: Subatomic Physics
• Keywords: Doubly Charge Higgs; Beyond Standard Model; LHC; ATLAS; TRT; Same-sign leptons; Fysicumarkivet A:2014:Hawkins
• Status: Published
• Project: ATLAS
• Supervisor: Else Lytken
• ISBN/ISSN/Other: ISBN: 978-91-7623-090-9; ISBN: 978-91-7623-089-3
• Defence date: 28 November 2014
• Defence time: 10:00
• Defence place: Rydbergs Sal
• Opponent: Freya Blekman (Dr.)