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Mesure du moment dipolaire électrique du neutron : correction de l'effet systématique du champ fantôme

Abstract : The search for a permanent electric dipole moment for simple systems such as the neutron is one of the most promising leads to discover CP violation beyond the Standard Model of particle physics.The discovery of such CP violation sources and the identification of new models beyond the Standard Model could lead to an explanation of the baryon asymmetry of the Universe.Therefore, there are several experiments aiming to measure a non-zero EDM for various systems (neutron, electron, atoms...).The Paul Scherrer Institute (PSI) nEDM experiment is one of them.The nEDM collaboration has collected data during two years (2015 and 2016) and published the most recent limit for the neutron EDM in April 2020.Precision measurements such as that experiment require an optimal control of the systematic effects.In this thesis, we present how to control the effects of the magnetic field inhomogeneities, which arise from the use of a mercury co-magnetometer in the PSI nEDM experiment.The co-magnetometer allows us to monitor the stability of the magnetic field and is essential to optimize the statistical sensibility.In order to correct the systematic effects of the magnetic field inhomogeneities, we perform an offline characterization of the field : the mapping.We present in this thesis the mapping measurement method, its analysis and the resulting corrections of the main systematic effect of the neutron EDM measurement.Once those corrections are taken into account, the last step of the analysis of nEDM data can be achieved, in order to extract the neutron EDM value which was published by the collaboration.The application of that step and its results are also presented in this thesis.
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Submitted on : Wednesday, February 3, 2021 - 4:17:19 PM
Last modification on : Thursday, February 4, 2021 - 3:28:39 AM


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  • HAL Id : tel-03130525, version 1




Laura Ferraris-Bouchez. Mesure du moment dipolaire électrique du neutron : correction de l'effet systématique du champ fantôme. Physique des Hautes Energies - Expérience [hep-ex]. Université Grenoble Alpes [2020-..], 2020. Français. ⟨NNT : 2020GRALY018⟩. ⟨tel-03130525⟩



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