Precise measurement on HFS of positronium

A. Ishida, G. Akimoto, K. Kato, T. Suehara, T. Namba, S. Asai, T. Kobayashi, H. Saito, M. Yoshida, K. Tanaka, A. Yamamoto, I. Ogawa, S. Kobayashi, T. Idehara

Research output: Contribution to journalConference articlepeer-review


Positronium is an ideal system for the research of the QED. The hyperfine splitting of positronium is sensitive to the higher order correction of the QED and to the new physics beyond the Standard Model via a vacuum oscillation. The new method of QED calculations has revealed the 3.5σ discrepancy between the QED prediction and the previous measurements. It might be because of the new physics or the experimental systematic uncertainties (the effect of unthermalized Ps and the nonuniformity of the magnetic fields). We present the results of the first run and the future plan of our new precise measurement on HFS without these uncertainties.

Original languageEnglish
Article number152021
JournalJournal of Physics: Conference Series
Issue number15
Publication statusPublished - Dec 24 2009
Externally publishedYes
Event26th International Conference on Photonic, Electronic and Atomic Collisions - Kalamazoo, United States
Duration: Jul 22 2009Jul 28 2009

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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