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Measurement of Parity Nonconservation and an Anapole Moment in Cesium

C. S. Wood

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

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S. C. Bennett

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

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D. Cho

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

Present address: Department of Physics, University of Korea, Seoul, Korea.

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B. P. Masterson

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

Present address: Melles Griot, Boulder, CO 80301, USA.

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J. L. Roberts

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

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C. E. Tanner

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

Present address: Department of Physics, University of Notre Dame, Notre Dame, IN 46556, USA.

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, and

C. E. Wieman

Joint Institute for Laboratory Astrophysics, University of Colorado, 440 UCB, Boulder, CO 80309-0440, USA

Department of Physics, University of Colorado, Boulder, CO 80309, USA

To whom correspondence should be addressed.

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https://doi.org/10.1142/9789812813787_0024Cited by:0 (Source: Crossref)

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(E1_pnc)/β = −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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Measurement of Parity Nonconservation and an Anapole Moment in Cesium

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