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21.02.2023 / 16:00 - 17:00 / Hamburg, Auditorium
Particle and Astroparticle Physics ColloquiumThe Mu-MASS experiment at PSI
Paolo Crivelli (ETH Zürich)
In this seminar I will present the overview of the Mu-MASS experiment which aims for a 1000-fold improvement in the determination of the 1S-2S transition frequency of Muonium (M). This substantial improvement beyond the current state-of-the-art relies on the novel cryogenic M converters we developed, the tremendous advances in generation of UV radiation, as well the unique low-energy-muon (LEM) beamline at PSI. Such a measurement will provide the most accurate value of the muon mass to 1 ppb. Combining our result with an improved determination of the ground state hyperfine structure of M ongoing at JPARC will yield the Rydberg constant to 4 ppt free of finite size effects, and provide one of the most stringent test of bound state QED to the ppb level. I will report our recent results on a precise determination of the M Lamb shift. Since our measured value matches the theoretical calculations within one standard deviation, we could set stringent limits on Lorentz/CPT violation in the muonic sector, as well as on new physics coupled to muons and electrons which could provide an explanation of the muon g-2 anomaly. I will conclude highlighting the prospects of the High intensity muon beam (HIMB) upgrade at PSI, e.g. how this could allow for an independent and competitive determination of the muon g-2 from M spectroscopy.
Mehr Informationen: https://physikseminar.desy.de/hamburg/colloquia_in_2023/21_february_2023/
