First Single Particle Measurements of the Proton and Antiproton Magnetic Moments

First Single Particle Measurements of the Proton and Antiproton Magnetic Moments

by Jack DiSciacca

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We report a new comparison of the proton (p) and antiproton (p̅) magnetic moments. In nuclear magnetons, μp /μN =2.792 846 (7) [2.5 ppm], while μp̅/μN = - 2.792 845 (12) [4.4 ppm]. The unprecedented accuracy of the antiproton measurement is 680 times more precise than previous work. These first single-particle measurements provide a stringent test of CPT invariance. Our comparison, μp̅/μp = -1.000 000 (5) [5.0 ppm], is consistent with the prediction of the CPT theorem. We also report the observation of a single proton spin flip, opening a path to improved precision by an additional factor of 103 or 104.

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