Experiment for the first direct measurement of the hyperfine splitting of positronium

A. Miyazaki, T. Suehara, A. Ishida, T. Namba, S. Asai, T. Kobayashi, H. Saito, M. Yoshida, T. Idehara, I. Ogawa, Y. Urushizaki, S. Sabchevski

研究成果: Contribution to journalArticle査読

3 被引用数 (Scopus)


Positronium is an ideal system for the research of the bound state QED. The hyperfine splitting of positronium (Ps-HFS: about 203 GHz) is a good tool to test QED and also sensitive to new physics beyond the Standard Model via a quantum oscillation between an ortho-Ps and a virtual photon. Previous experimental results show 3.9 σ (15 ppm) discrepancy from the QED calculation. All previous experiments used an indirect method with static magnetic field to cause Zeeman splitting (a few GHz) between triplet states of ortho-Ps, from which the HFS value was derived. One possible systematic error source of the indirect method is non-uniformity of the static magnetic field. We are developing a new direct Ps-HFS measurement system without static magnetic field. In this measurement we use a gyrotron, a novel sub-THz light source, with a high-finesse Fabry-Pérot cavity to obtain enough radiation power at 203 GHz. The present status of the optimization studies and current design of the experiment are described.

ジャーナルJournal of Physics: Conference Series
出版ステータス出版済み - 2010

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(全般)


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