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Comparison of two hardware-based hit filtering methods inhigh-pileup environments
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics. (ATLAS)
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
2017 (English)In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221Article in journal (Other academic) Submitted
Place, publisher, year, edition, pages
2017.
National Category
Subatomic Physics Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-329225OAI: oai:DiVA.org:uu-329225DiVA: diva2:1139951
Available from: 2017-09-11 Created: 2017-09-11 Last updated: 2017-09-11
In thesis
1. Searching for a charged Higgs boson and development of a hardware track trigger with the ATLAS experiment
Open this publication in new window or tab >>Searching for a charged Higgs boson and development of a hardware track trigger with the ATLAS experiment
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis describes searches for a heavy charged Higgs boson decaying into a top and bottom quark pair, and the development of a hardware track trigger with theATLAS experiment. The data for the two searches was collected with the ATLAS detector at the Large Hadron Collider(LHC) with pp collision energies of √s = 8 and 13 TeV, and corresponds to an integrated luminosity of 20.3 and 13.2 fb-1 respectively. The main background for this signal is the production of tt̄ pairs with additional heavy flavor radiation. The searches with a single lepton in the final state found no evidence of a charged Higgs boson, and set 95% CLS upper limits on the production times branching ratio for masses ranging between 200-1000 GeV. The preparation of using the final state with two leptons in future searches is discussed. The design of a hardware track trigger based on pattern matching and linear track fitting was studied for the purpose of reducing the high event rates of the High-Luminosity LHC, which is expected to provide pp collisions with a luminosity about five times the nominal value, in the second half of the 2020’s. A simulation framework was developed to emulate the pattern matching and was used to test its ability to filter hits in high pile-up environments. The results of this simulation, together with simulations of the track fitting and latency, show that such a track trigger is a viable option for the ATLAS experiment in the High Luminosity-LHC era.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2017. 110 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1557
Keyword
High energy physics, charged Higgs boson, Particle tracking
National Category
Subatomic Physics
Research subject
Physics with specialization in Elementary Particle Physics
Identifiers
urn:nbn:se:uu:diva-329227 (URN)978-91-513-0069-6 (ISBN)
Public defence
2017-10-27, Häggsalen, Ångströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2017-10-04 Created: 2017-09-11 Last updated: 2017-10-18

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