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MO: Fachverband Molekülphysik

MO 17: Poster: Cold Molecules

MO 17.10: Poster

Mittwoch, 13. März 2024, 17:00–19:00, Tent C

An Experiment to Measure the Electron’s Electric Dipole Moment Using an Ultracold Beam of YbF Molecules — •Michael Ziemba, Freddie Collings, Rhys Jenkins, Jongseok Lim, Ben Sauer, and Mike Tarbutt — Centre for Cold Matter, Imperial College London, London, SW7 2AZ, UK

The fact that more matter than antimatter has been produced in the early stages of the universe is unexplained [1]. One precondition is the combined violation of charge conjugation and parity (CP-violation) which is too small in the Standard Model. In almost all theories, CP-violation is also a precondition for the electron to have an electric dipole moment (d_e). In this respect, a measurement of de can be a test of theories beyond the Standard Model. The value of d_e can be determined by measuring the precession rate of the electron spin in a strong electric field. Heavy polarized molecules with their high intra-molecular fields have already set a limit of |d_e| < 4.1*10⁻³⁰ e cm [2]. To improve on this, we create a collimated, bright beam of laser cooled YbF molecules [3] and have built an experiment to measure d_e with it [4]. I will report the first interferometer fringes recorded on it and present the experiment’s key features which allow us to determine d_e with a projected uncertainty of 5*10⁻³⁰ e cm per day of measurement [3].

[1] L. Canetti et al. New J. Phys. 14 095012 (2012). [2] T. Roussy, et. al. arXiv:2212.11841 (2022). [3] X. Alauze et al. Quantum Sci. Technol. 6, 044005 (2021). [4] N J Fitch, et al. Quantum Sci. Technol., 6, 014006, (2021).

Keywords: Ultracold Molecules; Electron's Electric Dipole Moment; Transverse Laser Cooling