Gayther, Benjamin;
(2024)
Calibration and Commissioning Studies for the Mu3e Experiment.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
The Mu3e experiment will search for the charged lepton flavour violating decay µ + → e + e + e − . This interaction while possible in the Standard Model is suppressed to experimentally unobservable levels with a branching ratio below 10−50, hence any observation would be a clear indicator of physics beyond the Standard Model. The experiment will be based in the muon beam line, πE5, at the Paul Scherrer Institute, which can currently achieve rates of up to 108 muons per second. In this first phase of the experiment, a single event sensitivity of 2×10−15 is targeted, improving by several orders of magnitude on the current sensitivity set by the SINDRUM-I experiment. Taking into account the experimental difficulties of a high muon beam rate with low momenta decay positrons and electrons, the detector will be comprised of multiple ultra-thin tracking layers based on novel high voltage monolithic active pixel sensors providing excellent momentum and vertex resolutions. A good time resolution is also critical for the suppression of accidental backgrounds, hence a timing system combining scintillating fibres and tiles will provide precise timing information. The major focus of this thesis is on preparation for Phase I of the experiment. This includes studies of the timing system, in particular developing new methods for improving the timing performance in the track reconstruction with the scintillating fibres, and the development of a relative timing calibration method. Also presented is a study of a prototype pixel detector which gathered data with the aim to reconstruct cosmic muons. Finally, a method for extracting momentum resolutions and the feasibility of Mott scattering as a calibration tool for the detector are explored in simulation.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Calibration and Commissioning Studies for the Mu3e Experiment |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2024. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10194376 |
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