Paraskevas, Ioannis; (2022) Preparations for the Mu3e experiment: Magnet commissioning, beamline studies and a study of fake tracks. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

The Mu3e experiment at the Paul Scherrer Institute in Switzerland will search for the rare decay of a positive muon to two positrons and one electron. Phase I of the experiment aims for a sensitivity of one in 10^15 muon decays and Phase II aims for a sensitivity of one in 10^16 muon decays which is four orders of magnitude better that previous experiments. The Standard Model process via a neutrino loop is suppressed to unobservable levels O(< 10^50) and does not play a practical role. Therefore, any measurement of this decay would be a clear sign of new physics. To achieve its goal, Mu3e relies on a high rate of muons being detected in a spectrometer with a wide kinematic acceptance, excellent momentum and vertex resolutions and precise timing information. As of September 2021, data taking is expected to begin in 2022 at a muon rate of 10^8 μ/s. The full rate of 2x10^9 μ/s will not be reached before 2026. The main subject of this thesis is the preparations for the experiment which include the magnet commissioning, a magnet simulation, beamline simulation studies, beam measurements at the πE5 beamline and an analysis of fake tracks in simulation.

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