# First Single Particle Measurements of the Proton and Antiproton Magnetic Moments

 Title: First Single Particle Measurements of the Proton and Antiproton Magnetic Moments Author: DiSciacca, Jack Michael Citation: DiSciacca, Jack Michael. 2013. First Single Particle Measurements of the Proton and Antiproton Magnetic Moments. Doctoral dissertation, Harvard University. Full Text & Related Files: DiSciacca_gsas.harvard_0084L_10951.pdf (5.183Mb; PDF) Abstract: We report a new comparison of the proton (p) and antiproton $$(\bar{p})$$ magnetic moments. In nuclear magnetons, $$\mu_p/\mu_N$$ = 2.792 846 (7) [2.5 ppm], while $$\mu_{\bar{p}}/\mu_N$$ = 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, $$\mu_{\bar{p}}/\mu_p$$ = -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 $$10^3$$ or $$10^4$$. Terms of Use: This article is made available under the terms and conditions applicable to Other Posted Material, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#LAA Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:11095961 Downloads of this work: