Details

Autor(en) / Beteiligte

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

Titel

Precise measurement of positronium hyperfine splitting using the Zeeman effect

Ist Teil von

• Hyperfine interactions, 2012-12, Vol.212 (1-3), p.133-140

Ort / Verlag

Dordrecht: Springer Netherlands

Erscheinungsjahr

2012

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 (3.9 σ ) 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.