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Revisiting parity nonconservation in cesium.

V A Dzuba¹, J C Berengut, V V Flambaum

¹School of Physics, University of New South Wales, Sydney, New South Wales 2052, Australia.

Physical Review Letters

|December 11, 2012

Summary

We refined calculations for parity nonconservation (PNC) in cesium atoms. Our updated results show good agreement with previous work and provide new constraints on physics beyond the Standard Model.

Area of Science:

Atomic Physics
Quantum Mechanics
Particle Physics

Background:

Parity nonconservation (PNC) in atoms is a sensitive probe of fundamental physics.
Previous calculations of PNC in cesium have been performed, but refinements are ongoing.

Purpose of the Study:

To recalculate partial contributions to PNC in cesium using an improved sum-over-states approach.
To investigate the impact of core and highly excited states on PNC calculations.

Main Methods:

Application of the sum-over-states method.
Inclusion of contributions from core and highly excited states (n>9).

Main Results:

Significant corrections were found for two previously nondominating terms.

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The calculated PNC value E(PNC) was revised to 0.8977(40)×10⁻¹¹, showing good agreement with prior calculations (0.8980(45)).

Conclusions:

The refined PNC calculation for cesium aligns well with experimental interpretations within the Standard Model.
The results offer new constraints for exploring physics beyond the Standard Model.