350-fold improved measurement of the antiproton magnetic moment using a multi-trap method
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350-fold improved measurement of the antiproton magnetic moment using a multi-trap method Christian Smorra1 · Pascal E. Blessing1,2 · Matthias J. Borchert1,3 · Jack A. Devlin1 · James A. Harrington1,4 · Takashi Higuchi1,5 · Jonathan Morgner1,3 · Hiroki Nagahama1 · Stefan Sellner1 · Matthew A. Bohman1,4 · Andreas H. Mooser1,4 · ¨ 6 · Markus Wiesinger1,4 · Klaus Blaum4 · Georg L. Schneider1,6 · Natalie Schon 5 Yasuyuki Matsuda · Christian Ospelkaus3,7 · Wolfgang Quint2 · Jochen Walz6,8 · Yasunori Yamazaki1 · Stefan Ulmer1 Published online: 29 October 2018 © The Author(s) 2018
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. Keywords Fundamental symmetries and interactions · CPT invariance · Standard model · Penning trap · Antiproton · Magnetic moments
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 Christian Smorra
[email protected] 1
Ulmer Fundamental Symmetries Laboratory RIKEN, Wako, Japan
2
GSI-Helmholtzzentrum f¨ur Schwerionenforschung, Darmstadt, Germany
3
Institut f¨ur Quantenoptik, Leibniz Universit¨at Hannover, Hannover, Germany
4
Max-Planck-Institut f¨ur Kernphysik, Heidelberg, Germany
5
Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan
6
Institut f¨ur Physik, Johannes Gutenberg-Universit¨at Mainz, Mainz, Germany
7
Physikalisch-Technische Bundesanstalt, Braunschweig, Germany
8
Helmholtz-Institut Mainz, Mainz, Germany
47
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Hyperfine Interaction (2018) 239: 47
1 Introduction Antiprotons at ultra-low energy provide unique opportunities to directly test fundamental symmetries and interactions in the antimatter sector [1]. Precision spectroscopy on antiprotonic helium atoms [2] and antihydrogen [3–6] determine fundamental properties of antiparticles and their interactions, and provide stringent tests of CPT invariance. Other experiments aim to study the weak equivalence principle with antimatter [7–9]. Our experiments, BASE at CERN and the proton g-factor experiment BASE-Mainz, contribute to stringent tests of CPT invariance by comparing the fundamental properties of protons [10, 11] and antiprotons in Penning traps [12–15]. Other groups follow similar approaches [16, 17]. A s
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