Precision measurements of the fundamental properties of the proton and antiproton

Abstract

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 collaboration, which improved the uncertainty of the proton and antiproton magnetic moments and the comparison of the proton-to-antiproton charge-to-mass ratio. These measurements constitute the most stringent tests of CPT invariance with antiprotons. Further, we discuss the improved limit on the antiproton lifetime based on the storage of a cloud of antiprotons in the unique BASE reservoir trap. Based on these recent advances, we discuss ongoing technical developments which comprise a coupling trap for the sympathetic cooling of single (anti-)protons with laser-cooled beryllium ions, a transportable trap to relocate antiproton measurements into a high-precision laboratory, and a new experiment to measure the magnetic moment of helium-3 ions, which will improve absolute precision magnetometry.

ICPEAC 2019 conference proceedings

References in corpus (10)

• Search for Proton Decay via $p\to e^{+}{\pi }^0$ and $p\to {\mu }^{+}{\pi }^0$ in 0.31 megaton$\cdot$years exposure of the Super-Kamiokande Water Cherenkov Detector
• Search for axionlike dark matter with a liquid-state nuclear spin comagnetometer
• Lorentz-violating spinor electrodynamics and Penning traps
• Direct high-precision measurement of the magnetic moment of the proton
• Highly-sensitive superconducting circuits at ~700 kHz with tunable quality factors for image-current detection of single trapped antiprotons
• Ultrasensitive 3He magnetometer for measurements of high magnetic fields
• Tests of CPT and Lorentz symmetry from muon anomalous magnetic dipole moment
• Measurement of ultra-low heating rates of a single antiproton in a cryogenic Penning trap
• Observation of individual spin quantum transitions of a single antiproton
• Towards Sympathetic Cooling of Single (Anti-)Protons

Cited by in corpus (3)

• BASE-STEP: A transportable antiproton reservoir for fundamental interaction studies
• Nonperturbative Lorentz Violation and Field Quantization
• Physical interpretation of large Lorentz violation via Weyl semimetals