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# In-beam hyperfine spectroscopy of antihydrogen, hydrogen and deuterium

Dec 2022

The ASACUSA collaboration is developing a polarized beam of antihydrogenatoms to precisely determine the ground-state hyperfine structure for studiesof CPT and Lorentz invariance. Using a beam of ordinary hydrogen, measurementsof both the $\sigma$ and $\pi$-transition have been performed, investigatingorientation-dependent SME coefficients. Furthermore a first hyperfineexperiment with a beam of deuterium is being prepared.

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