Prof. Dr. Anna Sótér
ETH Zürich

LEMING – measuring how LEptons in Muonium are INteracting with Gravity

Donnerstag 9. November 2023, um 19:30 Uhr
ETH Hauptgebäude Hörsaal HG G5, Rämistrasse 101 und Live Stream über Zoom (Link via e-Mail)

Freier Fall von Myonium, Prinzip der Messung (Proposal for Leming, Soter et al.)

In our newly approved LEMING experiment at the Paul Scherrer institute we aspire to carry out next generation atomic physics and gravity experiments using muonium, which is an exotic atom consisting purely leptons, a muon and an electron (Mu = μ⁺ + e⁻).

The result of a Mu gravity measurement would be a direct test of the weak equivalence principle using elementary (anti)leptons from two families of fermions, and in the absence of masses generated during strong confinement of the quarks.

With the lack of an unified theory between General Relativity (GR) and the Standard Model (SM) probing an unexplored sector in the SM is motivated by basic principles of providing experimental input, and the possibilities for observing new physics can be potentially larger (or at least complementary) to other exotic gravity experiments using antimatter.

We started this challenging task by developing a novel cold atomic Mu beam in vacuum using muon conversion in superfluid helium. The basis of this new concept relied on the measured behavior of exotic atoms in SFHe, a recent laser spectroscopy result using antiprotonic helium at CERN.

We report here the first synthesis of a high luminosity, cold Mu beam that put us on a path for increased precision in 1S-2S laser spectroscopy of Mu, and paves the way for a free fall experiment on a percent precision using atom interferometry.

[Wegbeschreibungen]   [Veranstaltungs-Uebersicht]