Measurement of Parity Nonconservation and an Anapole Moment in Cesium |
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Authors: | CS Wood SC Bennett D Cho BP Masterson JL Roberts CE Tanner CE Wieman |
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Institution: | The authors are with JILA and the Department of Physics, University of Colorado, Boulder, CO 80309, USA. |
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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. |
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