title: High-accuracy calculation of 6s --> 7s parity-nonconserving amplitude in Cs.
abstract: We calculated the parity-nonconserving (PNC) 6s-->7s 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 beta are found to be -0.4% and -1%, respectively. The weak charge of 133Cs is Q(W) = -72.5+/-0.7 in agreement with the standard model.
authors.affiliation: Petersburg Nuclear Physics Institute, Gatchina, 188300 Russia.
authors.forename: M G
authors.initials: MG
authors.lastname: Kozlov
authors.forename: S G
authors.initials: SG
authors.lastname: Porsev
authors.forename: I I
authors.initials: II
authors.lastname: Tupitsyn