title: Measurement of the 1s-2s energy interval in muonium
abstract: The 1s-2s interval has been measured in the muonium (&mgr;(+)e(-)) atom by Doppler-free two-photon pulsed laser spectroscopy. The frequency separation of the states was determined to be 2 455 528 941.0(9.8) MHz, in good agreement with quantum electrodynamics. The result may be interpreted as a measurement of the muon-electron charge ratio as -1-1.1(2.1)x10(-9). We expect significantly higher accuracy at future high flux muon sources and from cw laser technology.
authors.affiliation: Physikalisches Institut der Universitat Heidelberg, D-69120 Heidelberg, Germany.
authors.initials: V
authors.lastname: Meyer
authors.initials: SN
authors.lastname: Bagayev
authors.initials: PE
authors.lastname: Baird
authors.initials: P
authors.lastname: Bakule
authors.initials: MG
authors.lastname: Boshier
authors.initials: A
authors.lastname: Breitruck
authors.initials: SL
authors.lastname: Cornish
authors.initials: S
authors.lastname: Dychkov
authors.initials: GH
authors.lastname: Eaton
authors.initials: A
authors.lastname: Grossmann
authors.initials: D
authors.lastname: Hubl
authors.initials: VW
authors.lastname: Hughes
authors.initials: K
authors.lastname: Jungmann
authors.initials: IC
authors.lastname: Lane
authors.initials: YW
authors.lastname: Liu
authors.initials: D
authors.lastname: Lucas
authors.initials: Y
authors.lastname: Matyugin
authors.initials: J
authors.lastname: Merkel
authors.lastname: zu Putlitz G
authors.initials: I
authors.lastname: Reinhard
authors.initials: PG
authors.lastname: Sandars
authors.initials: R
authors.lastname: Santra
authors.initials: PV
authors.lastname: Schmidt
authors.initials: CA
authors.lastname: Scott
authors.initials: WT
authors.lastname: Toner
authors.initials: M
authors.lastname: Towrie