In-beam hyperfine spectroscopy of antihydrogen, hydrogen and deuterium

TL;DR

This paper reports on hyperfine spectroscopy experiments with antihydrogen, hydrogen, and deuterium to test fundamental symmetries, including initial results with hydrogen and preparations with deuterium.

Contribution

It introduces new experimental measurements of hyperfine transitions in hydrogen and deuterium, and advances the development of antihydrogen spectroscopy for CPT and Lorentz invariance tests.

Findings

Measured hyperfine transitions in hydrogen, investigating orientation-dependent SME coefficients.

Prepared the first hyperfine experiment with deuterium.

Developed a polarized antihydrogen beam for fundamental symmetry tests.

Abstract

The ASACUSA collaboration is developing a polarized beam of antihydrogen atoms to precisely determine the ground-state hyperfine structure for studies of CPT and Lorentz invariance. Using a beam of ordinary hydrogen, measurements of both the $\sigma$ and $\pi$-transition have been performed, investigating orientation-dependent SME coefficients. Furthermore a first hyperfine experiment with a beam of deuterium is being prepared.