Journal
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
Volume 33, Issue 7, Pages 766-776Publisher
SPRINGER
DOI: 10.1007/s10762-011-9864-8
Keywords
Gyrotron; Positronium; Hyperfine splitting
Funding
- Grants-in-Aid for Scientific Research [23560393] Funding Source: KAKEN
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Positronium is an ideal system for research on QED, especially in a bound state. A discrepancy (3.9 sigma) is found recently between measured HFS values and the QED prediction (including up-to O(alpha (3) log alpha (-aEuro parts per thousand 1)), where alpha is the fine-structure constant.). It might be due to a contribution of unknown new physics or common systematic problems in all the previous measurements. A new method to measure HFS directly is performed using a high power gyrotron. The transition from ortho-positronium to para-positronium has been observed with 5 sigma CL, which is the first observation of M1 transition in (sub)Terahertz region. New technologies of high power gyrotrons are developed for precision spectroscopy.
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