title: Determination of the antiproton-to-electron mass ratio by precision laser spectroscopy of pHe+.
abstract: A femtosecond optical frequency comb and continuous-wave pulse-amplified laser were used to measure 12 transition frequencies of antiprotonic helium to fractional precisions of (9-16)x10(-9). One of these is between two states having microsecond-scale lifetimes hitherto unaccessible to our precision laser spectroscopy method. Comparisons with three-body QED calculations yielded an antiproton-to-electron mass ratio of Mp/me=1836.152674(5).
authors.affiliation: CERN, CH-1211 Geneva 23, Switzerland.
authors.forename: M
authors.initials: M
authors.lastname: Hori
authors.forename: A
authors.initials: A
authors.lastname: Dax
authors.forename: J
authors.initials: J
authors.lastname: Eades
authors.forename: K
authors.initials: K
authors.lastname: Gomikawa
authors.forename: R S
authors.initials: RS
authors.lastname: Hayano
authors.forename: N
authors.initials: N
authors.lastname: Ono
authors.forename: W
authors.initials: W
authors.lastname: Pirkl
authors.forename: E
authors.initials: E
authors.lastname: Widmann
authors.forename: H A
authors.initials: HA
authors.lastname: Torii
authors.forename: B
authors.initials: B
authors.lastname: Juhász
authors.forename: D
authors.initials: D
authors.lastname: Barna
authors.forename: D
authors.initials: D
authors.lastname: Horváth