CPT symmetry tests with cold and antihydrogen

Abstract

Precision comparisons of the properties of particles and their corresponding antiparticles are highly relevant because the Standard Model of elementary particle physics, a local, Lorentz-invariant field theory, is necessarily symmetric with respect to the combined CPT operation. This symmetry defines exact equality between the fundamental properties of particles and their anti-images. Any measured and confirmed violation constitutes a significant challenge to the Standard Model. Recent results of different CPT-tests are summarized, with emphasis to the high-precision measurement of the magnetic moment of the proton and the antiproton, as well as the precision investigation of antihydrogen ground state hyperfine splitting.

Experimental progress in positronium laser physics

“…The antihydrogen experiments conducted so far are primarily aimed at performing CPT tests via spectroscopic measurements [758], although one preliminary gravity test (setting extremely broad limits on possible antihydrogen antigravity) has been conducted [759]. Several newer collaborations have been established specifically to measure gravitational interactions involving antihydrogen [651,760].…”

Progress of Antihydrogen Beam Production Using a Double Cusp Trap

“…the unambiguous observation of neutrino oscillations implies non-zero neutrino mass, where the SM predicts the neutrino mass to be zero. This requires theories beyond the SM to explain these phenomena, some of them may violate CPT symmetry [1]. On the experimental side only a few precise tests of CPT invariance exist, which motivates and inspires further precise tests of CPT invariance, some of them are comparing the fundamental properties of matter and antimatter conjugates with high precision.…”

“…Some target precision spectroscopy of the 1S-2S transition [2,3] we, the ASACUSA collaboration, are focusing on hyperfine spectroscopy [1,4].…”

The Development of the Antihydrogen Beam Detector: Toward the Three Dimensional Tracking with a BGO Crystal and a Hodoscope

“…Several groups proposed the CPT test experiments usingH atoms via 1S-2S laser spectroscopy [1,2] and hyperfine spectroscopy [3,4].…”