Description
In the recently approved LEMING experiment at the Paul Scherrer Institute (PSI, Switzerland), we are developing a high-intensity, low-emittance atomic beam of muonium (M $\bf=\mu^+ + e^-$), which is amenable to next generation precision spectroscopy of M, and may allow a direct observation of the M gravitational interaction. Measuring the free fall of M atoms would be a test of the weak equivalence principle using elementary antimatter, and first gravitational test of a purely leptonic system in the absence of large binding energies from the strong interaction. In this paper we shortly reflect on the theoretical motivation and principles of this new experiment, and the experimental plans for the upcoming years.
Author
Anna Soter
(ETHZ)