BASE - The Baryon Antibaryon Symmetry Experiment

Abstract

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 the antiproton with high precision. Using single particles in a Penning trap, the proton/antiproton $g$-factors, i.e. the magnetic moment in units of the nuclear magneton, are determined by measuring the respective ratio of the spin-precession frequency to the cyclotron frequency. The spin precession frequency is measured by non-destructive detection of spin quantum transitions using the continuous Stern-Gerlach effect, and the cyclotron frequency is determined from the particle's motional eigenfrequencies in the Penning trap using the invariance theorem. By application of the double Penning-trap method we expect that in our measurements a fractional precision of $\delta g/g$ 10${}^{-9}$ can be achieved. The successful application of this method to the antiproton will represent a factor 1000 improvement in the fractional precision of its magnetic moment. The BASE collaboration has constructed and commissioned a new experiment at the Antiproton Decelerator (AD) of CERN. This article describes and summarizes the physical and technical aspects of this new experiment.

arXiv commentThis is the presubmission version of this article: http://link.springer.com/article/10.1140%2Fepjst%2Fe2015-02607-4

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• Direct high-precision measurement of the magnetic moment of the proton
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• Search for Lorentz and CPT Violation Effects in Muon Spin Precession
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• Direct Measurement of the Proton Magnetic Moment
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Cited by in corpus (27)

• Search for New Physics with Atoms and Molecules
• Antinuclei in Heavy-Ion Collisions
• Resolved-sideband laser cooling in a Penning trap
• Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap
• Direct limits on the interaction of antiprotons with axion-like dark matter
• Benchmarking a high-fidelity mixed-species entangling gate
• Highly-sensitive superconducting circuits at ~700 kHz with tunable quality factors for image-current detection of single trapped antiprotons
• Sympathetic cooling of a trapped proton mediated by an LC circuit
• Sympathetic Cooling of Protons and Antiprotons with a Common Endcap Penning Trap
• Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trap
• Algorithmic Ground-state Cooling of Weakly-Coupled Oscillators using Quantum Logic
• Observation of individual spin quantum transitions of a single antiproton
• Sympathetic cooling schemes for separately trapped ions coupled via image currents
• Sideband cooling of small ion Coulomb crystals in a Penning trap
• Quantum logic inspired techniques for spacetime-symmetry tests with (anti-)protons
• Precision measurements of the fundamental properties of the proton and antiproton
• Versatile control of ${}^9$Be${}^{+}$ ions using a spectrally tailored UV frequency comb
• A self-injection locked DBR laser for laser cooling of beryllium ions
• Towards Sympathetic Cooling of Single (Anti-)Protons
• Tank-Circuit Assisted Coupling Method for Sympathetic Laser Cooling
• BASE-STEP: A transportable antiproton reservoir for fundamental interaction studies
• Optical stimulated-Raman sideband spectroscopy of a single ${}^9$Be${}^{+}$ ion in a Penning trap
• Elementary laser-less quantum logic operations with (anti-)protons in Penning traps
• Theoretical Study of the Squeezed-Light-Enhanced Sensitivity to Gravity-Induced Entanglement via Finite-Time Analysis
• Towards Quantum Logic Inspired Cooling and Detection for Single (Anti-)Protons
• Quantum Logic Spectroscopy of an Electron and Positron for Precise Tests of the Standard Model
• Sympathetic cooling of charged particles in Penning traps using electron cyclotron radiation