We apply the sum-over-states approach to calculate partial contributions to parity nonconservation (PNC) in cesium [Porsev, Beloy, and Drevianko, Phys. Rev. Lett. 102, 181601 (2009)]. We find significant corrections to two nondominating 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., $E_{\mathrm{PNC}}=0.8906(24)\times {10}^{-11}i(-Q_W/N)$ 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, it gives new constraints on physics beyond it.

• Received 24 July 2012

DOI:https://doi.org/10.1103/PhysRevLett.109.203003