Muonium fine structure: theory update, tests of Lorentz violation and experimental prospects
Abstract
We review the status of the QED calculations for the muonium energy interval and provide the updated theoretical value of . Additionally, we present a model for probing Lorentz-violating coefficients within the Standard Model Extension framework using the fine structure measurement in the presence and absence of a weak external magnetic field, enabling novel tests of CPT and Lorentz symmetry. Using Monte Carlo simulations, we estimate that a precision of on the isolated transition could be achievable employing Ramsey's separate oscillatory fields (SOF) technique. Collecting the required statics will become feasible with the upcoming High-Intensity Muon Beam (HiMB) at the Paul Scherrer Institute (PSI) in Switzerland. These advancements will enable precise tests of radiative QED corrections and nuclear self-energy contributions, while also providing tests of new physics and sensitivity to unconstrained coefficients for Lorentz violation within the Standard Model Extension framework.
Keywords
Cite
@article{arxiv.2412.19580,
title = {Muonium fine structure: theory update, tests of Lorentz violation and experimental prospects},
author = {Philipp Blumer and Svenja Geissmann and Arnaldo J. Vargas and Gianluca Janka and Ben Ohayon and Paolo Crivelli},
journal= {arXiv preprint arXiv:2412.19580},
year = {2024}
}