2010/11/30 by Akira Miyazaki, Miyazaki, Akira
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Instrumentation and Detectors (physics.ins-det) #hep-ex #physics.atom-ph #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1011.6457
10 pages, 13 figures, a proceeding for ISSP2010 in Erice
arxiv created 2010/11/30 · arxiv updated 2010/12/01
Positronium is an ideal system for the research of QED in the bound state. The hyperfine splitting of positronium (Ps-HFS: about 203 GHz) is a good tool to test QED and also sensitive to new physics beyond the Standard Model. Previous experimental results show 3.9 σ (15 ppm) discrepancy from the QED O(α3 ln1/α) prediction. We point out probable common systematic errors in all previous experiments. I measure the Ps-HFS in two different ways. (1) A prototype run without RF system is described first. (2) I explain a new direct Ps-HFS measurement without static magnetic field. The present status of the optimization studies and current design of the experiment are described. We are now taking data of a test experiment for the observation of the direct transition.