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Direct Measurement of Positronium HyperFine Structure: ∼ A New Horizon of Precision Spectroscopy Using Gyrotrons ∼.
- Source :
-
Journal of Infrared, Millimeter & Terahertz Waves . Jul2012, Vol. 33 Issue 7, p766-776. 11p. - Publication Year :
- 2012
-
Abstract
- Positronium is an ideal system for research on QED, especially in a bound state. A discrepancy (3.9 σ) is found recently between measured HFS values and the QED prediction (including up-to O( α log α), where α 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 σ CL, which is the first observation of M1 transition in (sub)Terahertz region. New technologies of high power gyrotrons are developed for precision spectroscopy. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 18666892
- Volume :
- 33
- Issue :
- 7
- Database :
- Academic Search Index
- Journal :
- Journal of Infrared, Millimeter & Terahertz Waves
- Publication Type :
- Academic Journal
- Accession number :
- 76373704
- Full Text :
- https://doi.org/10.1007/s10762-011-9864-8