2010/04/30 by A. Ishida, Akira Ishida, Ishida, A. +23
Physics and Astronomy · #Atomic and Molecular Physics #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #physics.atom-ph
paper · pdf · doi:10.48550/arxiv.1004.5555
6 pages, 7 figures
arxiv created 2010/04/30 · arxiv updated 2010/05/03
The ground state hyperfine splitting of positronium, ΔHFS, is sensitive to high order corrections of QED. A new calculation up to O(α3 ln α) has revealed a 3.9σ discrepancy between the QED prediction and the experimental results. This discrepancy might either be due to systematic problems in the previous experiments or to contributions beyond the Standard Model. We propose an experiment to measure ΔHFS employing new methods designed to remedy the systematic errors which may have affected the previous experiments. Our experiment will provide an independent check of the discrepancy. The prototype run has been finished and a result of ΔHFS = 203.380 4 ± 0.008 4 GHz (41 ppm) has been obtained. A measurement with a precision of O(ppm) is expected within a few years.