# Sixfold improved single particle measurement of the magnetic moment of the antiproton

@article{Nagahama2017SixfoldIS, title={Sixfold improved single particle measurement of the magnetic moment of the antiproton}, author={H. Nagahama and Christian Smorra and Stefan Sellner and James A. Harrington and Takashi Higuchi and M. Borchert and T. Tanaka and Mustafa Besirli and Andreas H. Mooser and G. Schneider and Klaus Blaum and Yasuyuki Matsuda and Christian Ospelkaus and Wolfgang Quint and Jochen Walz and Yasunori Yamazaki and Stefan Ulmer}, journal={Nature Communications}, year={2017}, volume={8} }

Our current understanding of the Universe comes, among others, from particle physics and cosmology. In particle physics an almost perfect symmetry between matter and antimatter exists. On cosmological scales, however, a striking matter/antimatter imbalance is observed. This contradiction inspires comparisons of the fundamental properties of particles and antiparticles with high precision. Here we report on a measurement of the g-factor of the antiproton with a fractional precision of 0.8 parts…

## 42 Citations

A parts-per-billion measurement of the antiproton magnetic moment

- Physics, MedicineNature
- 2017

A high-precision measurement of the magnetic moment of the antiproton in units of the nuclear magneton μN with a fractional precision of 1.5 parts per billion is reported, which constrains the magnitude of certain CPT-violating effects to below 1.8 × 10−24 gigaelectronvolts.

Challenging the standard model by high-precision comparisons of the fundamental properties of protons and antiprotons

- Physics, MedicinePhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
- 2018

The BASE collaboration investigates the fundamental properties of protons and antiprotons, such as charge-to-mass ratios and magnetic moments, using advanced cryogenic Penning trap systems, and sets the most stringent constraint on directly measured antiproton lifetime.

Direct limits on the interaction of antiprotons with axion-like dark matter

- Physics, MedicineNature
- 2019

Spin-flip resonance data are used to place direct constraints on the interaction of ultralight axion-like particles with antiprotons, improving the sensitivity to the corresponding coupling coefficient by five orders of magnitude.

350-fold improved measurement of the antiproton magnetic moment using a multi-trap method

- PhysicsHyperfine Interactions
- 2018

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…

Observation of the 1S–2S transition in trapped antihydrogen

- Physics, MedicineNature
- 2017

The observation of the 1S–2S transition in magnetically trapped atoms of antihydrogen is reported, it is determined that the frequency of the transition, which is driven by two photons from a laser at 243 nanometres, is consistent with that expected for hydrogen in the same environment.

Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons

- PhysicsNew Journal of Physics
- 2021

Cosmological observations as well as theoretical approaches to physics beyond the standard model provide strong motivations for experimental tests of fundamental symmetries, such as CPT invariance.…

In-beam measurement of the hydrogen hyperfine splitting and prospects for antihydrogen spectroscopy

- Physics, MedicineNature communications
- 2017

A measurement of the zero-field hydrogen GS-HFS is presented using the spectroscopy apparatus of ASACUSA's antihydrogen experiment and proves the most precise determination of this quantity in a beam and verifies the developed spectroscopic methods for the antihydrogens HFS experiment to the p.p.b. level.

Double-trap measurement of the proton magnetic moment at 0.3 parts per billion precision

- Physics, MedicineScience
- 2017

A direct high-precision measurement of the magnetic moment μp of the proton in units of the nuclear magneton μN is reported, which improves the previous best measurement by a factor of 11, and is consistent with the currently accepted value.

Cold and stable antimatter for fundamental physics

- MedicineProceedings of the Japan Academy. Series B, Physical and biological sciences
- 2020

The field of cold antimatter physics has rapidly developed in the last 20 years, overlapping with the period of the Antiproton Decelerator (AD) at CERN. The central subjects are CPT symmetry tests…

Antihydrogen accumulation for fundamental symmetry tests

- Physics, MedicineNature Communications
- 2017

An efficient and high-precision method for trapping and stacking antihydrogen by using controlled plasma is demonstrated, with a record of 54 detected annihilation events from a single release of the trapped anti-atoms accumulated from five consecutive cycles.

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