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Searches for Electric Dipole Moments—Overview of Status and New Experimental Efforts

Physical Sciences Division, TRIUMF, Vancouver, BC V6T 2A3, Canada
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This paper is based on the talk at the 7th International Conference on New Frontiers in Physics (ICNFP 2018), Crete, Greece, 4–12 July 2018.
Universe 2019, 5(2), 56; https://doi.org/10.3390/universe5020056
Received: 31 December 2018 / Revised: 31 January 2019 / Accepted: 3 February 2019 / Published: 9 February 2019
Searches for permanent electric dipole moments (EDMs) of fundamental particles, atoms and molecules are promising experiments to constrain and potentially reveal beyond Standard Model (SM) physics. A non-zero EDM is a direct manifestation of time-reversal (T) violation, and, equivalently, violation of the combined operation of charge-conjugation (C) and parity inversion (P). Identifying new sources of CP violation can help to solve fundamental puzzles of the SM, e.g., the observed baryon-asymmetry in the Universe. Theoretical predictions for magnitudes of EDMs in the SM are many orders of magnitude below current experimental limits. However, many theories beyond the SM require larger EDMs. Experimental results, especially when combined in a global analysis, impose strong constraints on CP violating model parameters. Including an overview of EDM searches, I will focus on the future neutron EDM experiment at TRIUMF (Vancouver). For this effort, the TUCAN (TRIUMF Ultra Cold Advanced Neutron source) collaboration is aiming to build a strong, world leading source of ultra cold neutrons (UCN) based on a unique combination of a spallation target and a superfluid helium UCN converter. Another focus will be the search for an EDM of the diamagnetic atom 129 Xe using a 3 He comagnetometer and SQUID detection. The HeXeEDM collaboration has taken EDM data in 2017 and 2018 in the magnetically shielded room (BMSR-2) at PTB Berlin. View Full-Text
Keywords: electric dipole moment; EDM; CP violation; new physics; neutron; xenon electric dipole moment; EDM; CP violation; new physics; neutron; xenon
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Kuchler, F.; on behalf of the TUCAN and HeXeEDM Collaborations. Searches for Electric Dipole Moments—Overview of Status and New Experimental Efforts. Universe 2019, 5, 56.

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