High-Accuracy Calculation of6s7sParity-Nonconserving Amplitude in Cs

Abstract
We calculated the parity-nonconserving (PNC) 6s7s amplitude in Cs. In the Dirac-Coulomb approximation our result is in good agreement with other calculations. Breit corrections to the PNC amplitude and to the Stark-induced amplitude β are found to be 0.4% and 1%, respectively. The weak charge of 133Cs is QW=72.5±0.7 in agreement with the standard model.