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Development of a cold atomic muonium beam for next generation atomic physics and gravity experiments

Anna Soter, Andreas Knecht

SciPost Phys. Proc. 5, 031 (2021) · published 6 September 2021

Proceedings event

Review of Particle Physics at PSI


A high-intensity, low-emittance atomic muonium (M) beam is being developed, which would enable improving the precision of M spectroscopy measurements, and may allow a direct observation of the M gravitational interaction. Measuring the free fall of M atoms would be the first test of the weak equivalence principle using elementary antimatter ($\mu^+$) and a purely leptonic system. Such an experiment relies on the high intensity, continuous muon beams available at the Paul Scherrer Institute (PSI, Switzerland), and a proposed novel M source. In this paper, the theoretical motivation and principles of this experiment are described.

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