New experiment for the first direct measurement of positronium hyperfine splitting with sub-THz light

Akira Miyazaki, Takayuki Yamazaki, Taikan Suehara, Toshio Namba, Shoji Asai, Tomio Kobayashi, Hruo Saito, Toshitaka Idehara, Isamu Ogawa, Yuichi Urushizaki, Svilen Sabchevski

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Positronium is an ideal system for the research of Quantum Electrodynamics (QED), especially for QED in bound state. The discrepancy of 3.9σ was found recently between the measured HFS values and the QED prediction of O(α3). It might be due to the contribution of unknown new physics or systematic problems in the all previous measurements. We propose a new method to measure HFS directly and precisely. A gyrotron, a novel sub-THz light source is adopted with a Fabry-Pérot cavity with high finesse and an efficient transportation system in order to obtain sufficient radiation power at 203 GHz. The present status of the optimization studies and the current design of the experiment are described.

Original languageEnglish
Title of host publicationProgress in Positron Annihilation
PublisherTrans Tech Publications Ltd
Pages133-137
Number of pages5
ISBN (Print)9780878492084
DOIs
Publication statusPublished - 2011

Publication series

NameMaterials Science Forum
Volume666
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Keywords

  • Hyperfine splitting
  • Positronium
  • Sub-THz optics

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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