Reconciliation of the Measurement of Parity Nonconservation in Cs with the Standard Model

Contributions from the Breit interaction in atomic structure calculations account for 1.3σ of the previously reported 2.5σ deviation from the standard model in the ¹³³Cs weak charge [S. C. Bennett and C. E. Wieman, Phys. Rev. Lett. 82, 2484 (1999)]. The updated corrections for the neutron distribution reduce the discrepancy further to 1.0σ. The updated value of the weak charge is QW(¹³³Cs)0ex0ex=0ex0ex-72.65(28)ₑₓₚₜ(34)ₜₕₑₒᵣ.