title: Measurement of Parity Nonconservation and an Anapole Moment in Cesium
abstract: The amplitude of the parity-nonconserving transition between the 6S and 7S states of cesium was precisely measured with the use of a spin-polarized atomic beam. This measurement gives Im(E1pnc)/beta = -1.5935(56) millivolts per centimeter and provides an improved test of the standard model at low energy, including a value for the S parameter of -1.3(3)exp (11)theory. The nuclear spin-dependent contribution was 0.077(11) millivolts per centimeter; this contribution is a manifestation of parity violation in atomic nuclei and is a measurement of the long-sought anapole moment.
authors.affiliation: The authors are with JILA and the Department of Physics, University of Colorado, Boulder, CO 80309, USA.
authors.initials: CS
authors.lastname: Wood
authors.initials: SC
authors.lastname: Bennett
authors.initials: D
authors.lastname: Cho
authors.initials: BP
authors.lastname: Masterson
authors.initials: JL
authors.lastname: Roberts
authors.initials: CE
authors.lastname: Tanner
authors.initials: CE
authors.lastname: Wieman