Revisiting parity non-conservation in cesium

Abstract

We apply the sum-over-states approach to calculate partial contributions to the parity non-conservation (PNC) in cesium [Porsev {\em et al}, Phys. Rev. D {\bf 82}, 036008 (2010)]. We have found significant corrections to two non-dominating terms coming from the contribution of the core and highly excited states ($n>9$, the so called {\em tail}). When these differences are taken into account the result of Porsev {\em et al}, $E_{\mathrm{PNC}}=0.8906(24)\times 10^{-11}i(-Q_W/N)$ changes to $0.8977(40)$, coming into good agreement with our previous calculations, $0.8980(45)$. The interpretation of the PNC measurements in cesium still indicates reasonable agreement with the standard model ($1.5\sigma$), however gives new constraints on physics beyond it.

5 pages, 4 tables

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