The Direct Spectroscopy of Positronium Hyperfine Structure Using a Sub-THz Gyrotron

作者：Miyazaki Akira^*; Yamazaki Takayuki; Suehara Taikan; Namba Toshio; Asai Shoji; Kobayashi Tomio; Saito Haruo; Idehara Toshitaka; Ogawa Isamu; Tatematsu Yoshinori

来源：Journal of Infrared Millimeter and Terahertz Waves, 2014, 35(1): 91-100.

DOI：10.1007/s10762-013-0001-8

• Positronium
• Hyperfine splitting
• Gyrotron
• Fabry-Perot resonator
• Ring resonator
• Diffraction grating

Positronium is an ideal system for research on Quantum Electrodynamics (QED), especially in a bound state. A discrepancy of 3.9 standard deviations has been found between the measured hyperfine structure (Ps-HFS) and the QED predictions. This may be due to the contribution of unknown new physics or common systematic effects in previous measurements, in all of which the Zeeman effect was used. We propose a new method to directly measure the Ps-HFS using a high power gyrotron. We compare two resonators which have been developed to supply sufficient power to drive the direct transition, a Fabry-Perot resonator and a ring resonator with a diffraction grating. We plan to perform first direct measurement of Ps-HFS within the next six months.

• 出版日期2014-1