  Contributions from the Breit interaction in atomic-structure calculations
account for 1.3sigma of the previously reported 2.5sigma 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 1.0sigma. The updated value of
the weak charge is Q_W(133Cs) = -72.65(28)_{expt}(34)_{theor}.
  The present analysis is a higher-order extension of previous calculation [A.
Derevianko, E-print physics/0001046].
