Precise measurement of positronium hyperfine splitting using the Zeeman effect

Akira Ishida, Yuichi Sasaki, Ginga Akimoto, Taikan Suehara, Toshio Namba, Shoji Asai, Tomio Kobayashi, Haruo Saito, Mitsuhiro Yoshida, Kenichi Tanaka, Akira Yamamoto

研究成果: Article査読

8 被引用数 (Scopus)


Positronium is an ideal system for the research of the quantum electrodynamics (QED) in bound state. The hyperfine splitting (HFS) of positronium, Δ HFS, gives a good test of the bound state calculations and probes new physics beyond the Standard Model. A new method of QED calculations has revealed the discrepancy by 15 ppm (3.9σ) of Δ HFS between the QED prediction and the experimental average. There would be possibility of new physics or common systematic uncertainties in the previous all experiments. We describe a new experiment to reduce possible systematic uncertainties and will provide an independent check of the discrepancy. We are now taking data and the current result of Δ HFS = 203.395 1 ±0.002 4 (stat., 12 ppm) ±0.001 9 (sys., 9. 5 ppm) GHz has been obtained so far. A measurement with a precision of O(ppm) is expected within a year.

ジャーナルHyperfine Interactions
出版ステータスPublished - 2012 12

ASJC Scopus subject areas

  • 原子分子物理学および光学
  • 核物理学および高エネルギー物理学
  • 凝縮系物理学
  • 物理化学および理論化学


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