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Hyperfine Interactions

, 239:49 | Cite as

The Mu-MASS (muonium laser spectroscopy) experiment

  • P. CrivelliEmail author
Article
Part of the following topical collections:
  1. Proceedings of the 13th International Conference on Low Energy Antiproton Physics (LEAP 2018) Paris, France, 12-16 March 2018

Abstract

We present a new experiment, Mu-MASS, aiming for a 1000-fold improvement in the determination of the 1S-2S transition frequency of Muonium (M), the positive-muon/electron bound state. This substantial improvement beyond the current state-of-the-art relies on the novel cryogenic M converters and confinement techniques we developed, on the new excitation and detection schemes which we implemented for positronium spectroscopy and the tremendous advances in generation of UV radiation. This experiment is planned to be performed at the Paul Scherrer Institute (PSI). Interesting anomalies in the muon sector have accumulated: notably the famous anomalous muon magnetic moment (g-2) and the muonic hydrogen Lamb shift measurement which prompted the so-called proton charge radius puzzle. These tantalizing results triggered vibrant activity on both experimental and theoretical sides. Different explanations have been put forward including exciting solutions invoking New Physics beyond the Standard Model. Mu-MASS could contribute to clarifying the origin of these anomalies by providing robust and reliable values of fundamental constants such as the muon mass and a value of the Rydberg constant independent of finite size effects.

Keywords

Muonium Muon mass Laser spectroscopy 

PACS

36.10.Ee 32.10.-f 14.60.Ef 

Notes

Acknowledgements

The author gratefully acknowledge the essential help and support of Aldo Antognini, Dave Cooke, K. Khaw, Klaus Kirch, Dylan Yost, Thomas Prokscha, André Rubbia, Gunther Wichmann and A. Czarnecki, S. Karshenboim, Nikolai Kolachevsky, Klaus Jungmann and Randolf Pohl for the enlightening discussions.

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.ETH ZurichInstitute for Particle Physics and AstrophysicsZurichSwitzerland

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