Direct Measurement of Positronium HyperFine Structure: ∼ A New Horizon of Precision Spectroscopy Using Gyrotrons

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 3 log α  − 1 ), where α is the fine-structure constant.). It might be due to a contribution of unknown n...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2012-07, Vol.33 (7), p.766-776
Main Authors: Asai, Shoji, Yamazaki, Takayuki, Miyazaki, Akira, Suehara, Taikan, Namba, Toshio, Kobayashi, Tomio, Saito, Haruhiko, Idehara, Takatoshi, Ogawa, Isamu, Sabchevski, S.
Format: Article
Language:English
Subjects:
Classical Electrodynamics
Cyclotron resonance devices
Electrical Engineering
Electronics and Microelectronics
Engineering
Gyrotrons
Horizon
Hyperfine structure
Infrared
Instrumentation
New technology
Positronium
Spectroscopy
Spectrum analysis
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Summary: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 3 log α  − 1 ), 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.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-011-9864-8