Precise measurement of hyperfine splitting of positronium using the Zeeman effect

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

研究成果: Chapter in Book/Report/Conference proceedingConference contribution

抄録

The ground state hyperfine splitting of positronium, ΔHFS, is sensitive to high order corrections of QED. A new calculation up to O(α 3 lnα ) has revealed a 3.9 σ discrepancy between the QED prediction and the experimental results. This discrepancy might either be due to systematic problems in the previous experiments or to contributions beyond the Standard Model. We propose an experiment to measure ΔHFS employing new methods designed to remedy the possible systematic errors which may have affected the previous experiments. Our experiment will provide an independent check of the discrepancy. The prototype run has been performed and a result of ΔHFS = 203.3804 ± 0.0022 (stat., 11 ppm) ± 0.0081 (sys., 40 ppm) GHz has been obtained. Compensation magnets to obtain O(ppm) magnetic field uniformity has been developed. The final run will start soon and a measurement with a precision of O(ppm) is expected within a few years.

本文言語英語
ホスト出版物のタイトルProgress in Positron Annihilation
出版社Trans Tech Publications Ltd
ページ129-132
ページ数4
ISBN(印刷版)9780878492084
DOI
出版ステータス出版済み - 2011
外部発表はい

出版物シリーズ

名前Materials Science Forum
666
ISSN(印刷版)0255-5476
ISSN(電子版)1662-9752

All Science Journal Classification (ASJC) codes

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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