Speaker
Takayuki Yamazaki
(International Center for Elementary Particle Physics, University of Tokyo)
Description
Positronium (Ps), a bound state of an electron and a positron, is a purely leptonic system and is a good target to study Quantum Electrodynamics (QED) in bound state. We plan to directly measure the hyperfine structure of the ground-state positronium (Ps-HFS), which is about 203 GHz. Precise measurements of Ps-HFS have been performed in 1970s and 1980s, but all of them are indirect measurements using Zeeman splitting of about 3GHz cause by a static magnetic field of about 1T. In order to measure Ps-HFS with a different method free from systematic uncertainty of the static magnetic field, we develop a new optical system to accumulate about 20 kW power using a gyrotron and high finesse Fabry-Pérot resonator. We report the current status of our experiment.
Primary author
Takayuki Yamazaki
(International Center for Elementary Particle Physics, University of Tokyo)
Co-authors
Mr
Akira Miyazaki
(Department of Physics, Graduate School of Science, The University of Tokyo)
Prof.
Isamu Ogawa
(Research Center for Development of Far-Infrared Region, University of Fukui)
Prof.
Shoji Asai
(Department of Physics, Graduate School of Sience, The University of Tokyo)
Dr
Taikan Suehara
(Department of Physics, Graduate School of Science, Tohoku University)
Prof.
Tomio Kobayashi
(International Center for Elementary Particle Physics, The University of Tokyo)
Dr
Toshio Namba
(International Center for Elementary Particle Physics (ICEPP), The University of Tokyo)
Prof.
Toshitaka Idehara
(Research Center for Development of Far-Infrared Region, University of Fukui)
Dr
Yoshinori Tatematsu
(Research Center for Development of Far-Infrared Region, University of Fukui)
