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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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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cited_by cdi_FETCH-LOGICAL-c3738-d8b3ddc5d194e9341904b9f4717877ec7368329f96dfdedc0fecb65159394bf13
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container_title Journal of infrared, millimeter and terahertz waves
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creator Asai, Shoji
Yamazaki, Takayuki
Miyazaki, Akira
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Ogawa, Isamu
Sabchevski, S.
description 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.
doi_str_mv 10.1007/s10762-011-9864-8
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subjects Classical Electrodynamics
Cyclotron resonance devices
Electrical Engineering
Electronics and Microelectronics
Engineering
Gyrotrons
Horizon
Hyperfine structure
Infrared
Instrumentation
New technology
Positronium
Spectroscopy
Spectrum analysis
title Direct Measurement of Positronium HyperFine Structure: ∼ A New Horizon of Precision Spectroscopy Using Gyrotrons
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