Hyperfine spectroscopy of antihydrogen, hydrogen, and deuterium

TL;DR

This paper discusses precision hyperfine spectroscopy of antihydrogen, hydrogen, and deuterium to test CPT symmetry and Lorentz invariance, highlighting recent experimental efforts and their significance in fundamental physics.

Contribution

It presents recent experimental approaches and the potential of hyperfine spectroscopy in antihydrogen, hydrogen, and deuterium for testing fundamental symmetries.

Findings

Progress in antihydrogen hyperfine measurements at CERN

Parallel experiments on hydrogen and deuterium for Lorentz invariance tests

Potential to improve constraints on CPT and Lorentz symmetry violations

Abstract

The prospects of tests of CPT symmetry using precision spectroscopy of antihydrogen are discussed with special emphasis on the ground-state hyperfine structure, a measurement of which is the aim of the ASACUSA collaboration at the AD/ELENA facility of CERN. Ongoing parallel experiments using hyperfine spectroscopy of hydrogen and deuterium aiming at studying Lorentz invariance by determining coefficients of the Standard Model Extension framework are described.