Positronium is an ideal system for the research of the QED. The hyperfine splitting of positronium (Ps-HFS) is sensitive to the new physics beyond the Standard Model via a vacuum oscillation. Previous experimental results of the Ps-HFS show 3.5 σ discrepancy from the QED calculation, and it might be caused by uncertainties of the indirect method with static magnetic field and a few GHz RF. We developed a new direct measurement system of the Ps-HFS without static magnetic field, using a sub-THz gyrotron and a quasi-optical Fabry-Perot cavity. Status (hopefully the first result) of the direct positronium hyperfine transition observation will be presented.
|Journal||Journal of Physics: Conference Series|
|Publication status||Published - Dec 24 2009|
|Event||26th International Conference on Photonic, Electronic and Atomic Collisions - Kalamazoo, United States|
Duration: Jul 22 2009 → Jul 28 2009
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)