Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 34: Precision spectroscopy of atoms and ions II (with Q)
A 34.1: Hauptvortrag
Donnerstag, 3. März 2016, 11:00–11:30, f428
The magnetic moment of the antiproton — •Stefan Sellner1, Klaus Blaum2, Matthias Borchert3, Takashi Higuchi1,4, Nathan Leefer5, Yasuyuki Matsuda4, Andreas Mooser1, Hiroki Nagahama1,4, Christian Ospelkaus3, Wolfgang Quint6, Georg Schneider7, Christian Smorra1,8, Toya Tanaka4, Jochen Walz5,7, Yasunori Yamazaki9, and Stefan Ulmer1 — 1Ulmer Initiative Research Unit, RIKEN, Wako, Japan — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 3Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany — 4Graduate School of Arts and Sciences, University of Tokyo, Tokyo, Japan — 5Helmholtz-Institut Mainz, Mainz, Germany — 6GSI-Helmholzzentrum für Schwerionenforschung, Darmstadt, Germany — 7Institut für Physik, Johannes Gutenberg-Universität Mainz, Mainz, Germany — 8CERN, Geneva, Switzerland — 9Atomic Physics Laboratory, RIKEN, Wako, Japan
The Standard Model describes the fundamental interactions and properties of elementary particles. Being a Lorentz-invariant theory, the absolute values of the properties like charge, mass, and magnetic moment, of matter and antimatter-conjugates, are invariant under the combined charge, parity, and time transformation. Any violation of this CPT symmetry would indicate new physics. The BASE experiment tests this symmetry at lowest energy and with highest precision. We use an advanced multi-Penning trap system to compare charge-to-mass ratios and magnetic moments of single protons and antiprotons, respectively.
Our aimed relative precision is 1 ppb (10−9) for the magnetic moment measurement. Last year, we succeeded in measuring the charge-to-mass ratio of the antiproton and the proton [1], confirming CPT invariance down to the atto-electron volt scale with a measurement precision of 69 parts per trillion. Next, we will focus on magnetic moment measurements.
In my talk, I will present the techniques and recent results of our measurements at BASE and give an outlook on future improvements.
[1] S. Ulmer et al, Nature 524, p. 196-199 (2015)