CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments

We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of ▪ on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments....

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Bibliographic Details
Published in:Physics letters. B 2024-11, Vol.858, p.139012, Article 139012
Main Authors: Nowak, L., Malbrunot, C., Simon, M.C., Amsler, C., Arguedas Cuendis, S., Lahs, S., Lanz, A., Nanda, A., Wiesinger, M., Wolz, T., Widmann, E.
Format: Article
Language:English
Subjects:
CPT and Lorentz violation
Ground-state hyperfine splitting
Hydrogen
Rabi spectroscopy
Standard Model Extension
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Summary:We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of ▪ on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments. Moreover, we introduce a novel method, applicable to antihydrogen hyperfine spectroscopy in a beam, that determines the zero-field hyperfine transition frequency from the two transitions measured at the same magnetic field. Our value, ▪, is in agreement with literature at a relative precision of 0.44 ppb. This is the highest precision achieved on hydrogen in a beam, improving over previous results by a factor of 6.
ISSN:0370-2693
DOI:10.1016/j.physletb.2024.139012