Vasilkova, Dominika;
(2023)
Searching for a Muon Electric Dipole Moment with the Straw Trackers at the Fermilab Muon g-2 experiment.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
As well as measuring the muon magnetic moment (MDM), the Muon g-2 experiment at Fermilab is aiming to make a new world leading measurement of the muon electric dipole moment (EDM), with a target of 10−21 e·cm, an improvement of two orders of magnitude compared to the previous best limit set at Brookhaven National Laboratory (BNL) [1]. This thesis presents the analysis of the Run 2/3 data, focussing on using the straw tracker detectors to measure an oscillation in the vertical angle of the muon precession plane to search for an EDM. A standalone simulation is developed to study the experimental EDM sensitivity, enabling fast evaluation of the main systematics. The radial field is found to be the dominant error if not measured to better than 1ppm precision. A new measurement technique is developed to measure this, with the results of the Run 5 radial field scan successfully achieving a 0.46ppm uncertainty, better than the target precision. The EDM limit setting methods themselves are discussed and compared in order to select the optimal one for the analysis. Since the trackers are a vital part of this measurement, characterisation and optimisation of their performance is also considered. Various studies are performed, including an investigation into the optimal operating voltage and an in-depth study of crosstalk. A new time-dependent tracker effect is discovered which directly impacts the EDM analyses, which is evaluated and a correction developed. Run 2/3 data is analysed to perform a blinded search for a muon EDM, including corrections and systematic uncertainties. The results, if found to be zero when unblinded, will set a new world limit on the muon EDM of 5.9 ×10−20 e·cm. This improves on the previous value by a factor of 3.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Searching for a Muon Electric Dipole Moment with the Straw Trackers at the Fermilab Muon g-2 experiment |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2023. 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/10178388 |
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