title: One-particle measurement of the antiproton magnetic moment.
abstract: For the first time a single trapped antiproton (p) is used to measure the p magnetic moment μ(p). The moment μ(p)=μ(p)S/(ℏ/2) is given in terms of its spin S and the nuclear magneton (μ(N)) by μ(p)/μ(N)=-2.792 845±0.000 012. The 4.4 parts per million (ppm) uncertainty is 680 times smaller than previously realized. Comparing to the proton moment measured using the same method and trap electrodes gives μ(p)/μ(p)=-1.000 000±0.000 005 to 5 ppm, for a proton moment μ(p)=μ(p)S/(ℏ/2), consistent with the prediction of the CPT theorem.
authors.affiliation: Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
authors.forename: J
authors.initials: J
authors.lastname: DiSciacca
authors.forename: M
authors.initials: M
authors.lastname: Marshall
authors.forename: K
authors.initials: K
authors.lastname: Marable
authors.forename: G
authors.initials: G
authors.lastname: Gabrielse
authors.forename: S
authors.initials: S
authors.lastname: Ettenauer
authors.forename: E
authors.initials: E
authors.lastname: Tardiff
authors.forename: R
authors.initials: R
authors.lastname: Kalra
authors.forename: D W
authors.initials: DW
authors.lastname: Fitzakerley
authors.forename: M C
authors.initials: MC
authors.lastname: George
authors.forename: E A
authors.initials: EA
authors.lastname: Hessels
authors.forename: C H
authors.initials: CH
authors.lastname: Storry
authors.forename: M
authors.initials: M
authors.lastname: Weel
authors.forename: D
authors.initials: D
authors.lastname: Grzonka
authors.forename: W
authors.initials: W
authors.lastname: Oelert
authors.forename: T
authors.initials: T
authors.lastname: Sefzick