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The Direct Spectroscopy of Positronium Hyperfine Structure Using a Sub-THz Gyrotron |
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| Authors: | Akira Miyazaki Takayuki Yamazaki Taikan Suehara Toshio Namba Shoji Asai Tomio Kobayashi Haruo Saito Toshitaka Idehara Isamu Ogawa Yoshinori Tatematsu |
| Affiliation: | 1. Department of Physics, Graduate School of Science, and International Center for Elementary Particle Physics, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan 2. Department of Physics, Graduate School of Science, Tohoku University, 6-3 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi, 980-8578, Japan 3. Graduate School of Arts and Sciences, The University of Tokyo, 3-8-1 Komaba, Meguro-ku, Tokyo, 153-8902, Japan 4. Research Center for Development of Far-Infrared Region, University of Fukui, Bunkyo 3-9-1, Fukui, 910-8507, Japan |
| Abstract: | Positronium is an ideal system for research on Quantum Electrodynamics (QED), especially in a bound state. A discrepancy of 3.9 standard deviations has been found between the measured hyperfine structure (Ps-HFS) and the QED predictions. This may be due to the contribution of unknown new physics or common systematic effects in previous measurements, in all of which the Zeeman effect was used. We propose a new method to directly measure the Ps-HFS using a high power gyrotron. We compare two resonators which have been developed to supply sufficient power to drive the direct transition, a Fabry-Pérot resonator and a ring resonator with a diffraction grating. We plan to perform first direct measurement of Ps-HFS within the next six months. |
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