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

  title={A parts-per-billion measurement of the antiproton magnetic moment},
  author={Christian Smorra and Stefan Sellner and M. Borchert and James A. Harrington and Takashi Higuchi and H. Nagahama and T. Tanaka and Andreas H. Mooser and G. Schneider and Matthew Bohman and Klaus Blaum and Yasuyuki Matsuda and Christian Ospelkaus and Wolfgang Quint and Jochen Walz and Yasunori Yamazaki and Stefan Ulmer},
Precise comparisons of the fundamental properties of matter–antimatter conjugates provide sensitive tests of charge–parity–time (CPT) invariance, which is an important symmetry that rests on basic assumptions of the standard model of particle physics. Experiments on mesons, leptons and baryons have compared different properties of matter–antimatter conjugates with fractional uncertainties at the parts-per-billion level or better. One specific quantity, however, has so far only been known to a… 

A 16-parts-per-trillion measurement of the antiproton-to-proton charge–mass ratio

A new comparison of the proton/antiproton charge-to-mass ratios with a fractional uncertainty of 16 parts per trillion is reported, consistent with the fundamental charge–parity–time reversal invariance, and improves the precision of the previous best measurement by a factor of 4.3.

Apparatus and Methods for a New Measurement of the Electron and Positron Magnetic Moments

This thesis presents contributions to two precision measurement experiments: electron and positron g/2, and ATRAP antihydrogen spectroscopy. The magnetic moment of the electron in Bohr magnetons,

Precision Measurements of the Fundamental Properties of the Proton and Antiproton

Precision measurements comparing the fundamental properties of conjugate particles and antiparticles constitute stringent tests of CPT invariance. We review recent precision measurements of the BASE

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

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

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

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.

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

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.

High-precision mass spectrometer for light ions

The precise knowledge of the atomic masses of light atomic nuclei, e.g. the proton, deuteron, triton and helion, is of great importance for several fundamental tests in physics. However, the latest

Cold and stable antimatter for fundamental physics

  • Y. Yamazaki
  • Physics
    Proceedings 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

Low-energy antimatter experiments at the antiproton decelerator at CERN: Testing CPT invariance and the WEP

  • I. Tietje
  • Physics
    Journal of Physics: Conference Series
  • 2018
The riddle of the baryon asymmetry, i.e. the matter antimatter imbalance in the universe can be addressed by comparing matter particles with their antimatter counterparts. At the antiproton

Characterization of the 1S–2S transition in antihydrogen

The shape of the spectral line and the resonance frequency of the 1S–2S transition in antihydrogen agree very well with those of hydrogen, consistent with charge–parity–time invariance at a relative precision of 2 × 10−12—two orders of magnitude more precise than the previous determination.



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

This work reports on a measurement of the g-factor of the antiproton with a fractional precision of 0.8 parts per million at 95% confidence level that agrees with the fundamental charge, parity, time (CPT) invariance of the Standard Model of particle physics.

High-precision comparison of the antiproton-to-proton charge-to-mass ratio

The result can be interpreted as a stringent test of the weak equivalence principle of general relativity using baryonic antimatter, and it sets a new limit on the gravitational anomaly parameter of < 8.7 × 10−7.

BASE – The Baryon Antibaryon Symmetry Experiment

The Baryon Antibaryon Symmetry Experiment (BASE) aims at performing a stringent test of the combined charge parity and time reversal (CPT) symmetry by comparing the magnetic moments of the proton and

Direct high-precision measurement of the magnetic moment of the proton

The direct high-precision measurement of the magnetic moment of a single proton using the double Penning-trap technique is reported, which improves the precision of the forty-year-old indirect measurement and can be improved by a factor of at least 1,000.

Isotope dependence of the Zeeman effect in lithium-like calcium

Calculations and experiments on the isotope dependence of the Zeeman effect in lithium-like calcium ions and the good agreement between the theoretical predicted recoil contribution and the high-precision g-factor measurements paves the way for a new generation of BS-QED tests.

Buffer-gas cooling of antiprotonic helium to 1.5 to 1.7 K, and antiproton-to–electron mass ratio

The extracted mass of the antiproton (relative to the electron mass) was in good agreement with previous measurements of the proton mass, in keeping with the implications of the combined charge, parity, and time-reversal symmetry of physical laws.

A source of antihydrogen for in-flight hyperfine spectroscopy

This work reports the development of an antihydrogen source using a cusp trap for in-flight spectroscopy, a major step towards precision spectroscopic of the ground-state hyperfine splitting of antiHydrogen using Rabi-like beam spectroscope.

Final report of the E821 muon anomalous magnetic moment measurement at BNL

We present the final report from a series of precision measurements of the muon anomalous magnetic moment, a(mu)=(g-2)/2. The details of the experimental method, apparatus, data taking, and analysis

Resonant quantum transitions in trapped antihydrogen atoms

Spectroscopy of a pure antimatter atom is reported, demonstrating resonant quantum transitions inAntihydrogen, and the direct detection of the annihilation of antihydrogen atoms ejected by the microwaves is described.