First direct measurement of positronium hyperfine splitting with sub-THz light

Details First direct measurement of positronium hyperfine splitting with sub-THz light First direct measurement of positronium hyperfine splitting with sub-THz light

2011-05-22

arxiv.org/abs/1105.4352v1

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 8 figures, Proceedings of LEAP 2011

Scientific paper

Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS, about 203 GHz) is an important observable but all previous measurements of Ps-HFS had been measured indirectly using Zeeman splitting. There might be the unknown systematic errors on the uniformity of magnetic field. We are trying to measure Ps-HFS directly using sub-THz radiation. We developed an optical system to accumulate high power (about 10 kW) radiation in a Fabry-P\'erot resonant cavity and observed the positronium hyperfine transition for the first time.

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