Revisiting Parity Nonconservation in Cesium

V. A. Dzuba, J. C. Berengut, V. V. Flambaum, B. M. Roberts, Phys. Rev. Lett. 109, 203003 (2012)



We apply the sum-over-states approach to calculate partial contributions to the parity non-conservation (PNC) in cesium [Porsev et al, Phys. Rev. D 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 tail). When these differences are taken into account the result of Porsev et al, \(E_{\rm PNC} = 0.8906\,(24) \times 10^{-11}i(-Q_W/N)\) 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.

Written on 13 November 2012