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
PNC
=0.8906(24)×
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 (
1.5σ
), however gives new constraints on physics beyond it.