High-precision calculation of parity nonconservation in cesium and test of the standard model
High-precision calculation of parity nonconservation in cesium and test of the standard model
We calculate the $6s\ensuremath{-}7s$ parity nonconserving (PNC) $E1$ transition amplitude ${E}_{\mathrm{PNC}}$ in cesium. We use an improved all-order technique in the calculation of the correlations and include all significant contributions to ${E}_{\mathrm{PNC}}.$ Our final value ${E}_{\mathrm{PNC}}=0.904(1\ifmmode\pm\else\textpm\fi{}0.5%)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}11}{\mathrm{iea}}_{B}(\ensuremath{-}{Q}_{W}/N)$ has half the uncertainty claimed in old calculations used for the interpretation of Cs …