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TY  - THES
AU  - Andres, Achim
TI  - The first direct measurement of the deuteron electric dipole moment at the cooler synchrotron COSY
PB  - RWTH Aachen University
VL  - Dissertation
CY  - Aachen
M1  - RWTH-2024-12160
SP  - 1 Online-Ressource : Illustrationen
PY  - 2024
N1  - Veröffentlicht auf dem Publikationsserver der RWTH Aachen University 2025
N1  - Dissertation, RWTH Aachen University, 2024
AB  - Currently, we do not understand why there is more matter than antimatter in our universe. The matter-antimatter asymmetry could only occur under specific conditions called the Sakharov conditions, one of which involves the violation of combined CP symmetry. Our understanding of the universe is based on the preservation of quantities such as energy, momentum, and charge. Advances in elementary particle physics have led to the discovery of new symmetries, including parity P, charge conjugation C, and time-reversal T symmetries. Traditionally, these symmetries were believed to be universal. However, over the past few decades, small violations of C, P, and combined CP symmetries have been detected and incorporated into the Standard Model of particle physics and cosmology. Nonetheless, these violations are insufficient to explain the observed domination of matter over antimatter. Hence, the search for additional CP-violating phenomena continues. A possible manifestation of additional CP violation is the Electric Dipole Moment (EDM) of elementary particles. The Standard Model predicts a highly suppressed EDM, requiring experiments with high statistical and systematic sensitivity for detection. Conversely, models of physics beyond the Standard Model predict significantly larger EDMs, making EDM measurements an important tool for excluding certain beyond Standard Model theories. To date, all measurements of EDMs have been consistent with zero, providing only upper limits on the EDM size of various particles. The EDM must be a vectorial property aligned with a particle's spin, so measurement techniques focus on detecting changes in spin polarization signals caused by the interaction of a potential EDM with electric fields. Because charged particles are accelerated by electric fields, storage rings are ideal for charged particle EDM experiments such as the deuteron, for which no experimental limit is available so far. The goal of this thesis is to perform the first direct measurement of the deuteron Electric Dipole Moment at the Cooler Synchrotron at Forschungszentrum Jülich by observing the influence of the Electric Dipole Moment on the polarization of a stored bunched and polarized deuteron beam. The measured values presented in this thesis are dominated by systematic errors, from which an upper limit of the deuteron Electric Dipole Moment is derived:  - d^d -  < 2.2e-16 e cm (95
LB  - PUB:(DE-HGF)11
DO  - DOI:10.18154/RWTH-2024-12160
UR  - https://publications.rwth-aachen.de/record/999521
ER  -