Abstract
We summarize our recent 1.5 parts per billion measurement of the antiproton magnetic moment using the multi Penning-trap system of the BASE collaboration. The result was achieved by combining the detection of individual spin-transitions of a single antiproton with a novel two-particle spectroscopy technique, which dramatically improved the data sampling rate. This measurement contributes to improve the test of the fundamental charge, parity, time reversal (CPT) invariance in the baryon sector by a factor of 350 compared to our last measurement, and by a factor of 3000 compared to the best competing measurement. We review the measurement technique and discuss the improved limits on CPT-violating physics imposed by this measurement.
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Acknowledgments
We acknowledge technical support from the Antiproton Decelerator group, CERN’s cryolab team, and all other CERN groups which provide support to Antiproton Decelerator experiments. We acknowledge financial support from the RIKEN Initiative Research Unit Program, RIKEN President Funding, RIKEN Pioneering Project Funding, RIKEN FPR Funding, RIKEN chief scientist program, the RIKEN JRA Program, the Max-Planck Society, the EU (ERC Advanced Grant No. 290870-MEFUCO), and the Helmholtz-Gemeinschaft.
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This article is part of the Topical Collection on Proceedings of the 13th International Conference on Low Energy Antiproton Physics (LEAP 2018) Paris, France, 12-16 March 2018
Edited by Paul Indelicato, Dirk van der Werf, and Yves Sacquin
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Smorra, C., Blessing, P.E., Borchert, M.J. et al. 350-fold improved measurement of the antiproton magnetic moment using a multi-trap method. Hyperfine Interact 239, 47 (2018). https://doi.org/10.1007/s10751-018-1507-1
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DOI: https://doi.org/10.1007/s10751-018-1507-1