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Higher-order corrections to parity violation in atoms in SU(2) x U(1) models

We calculate the higher-order corrections to the parity-violating amplitude for electron-up (-down) quark amplitudes in SU(2) x U(1) models. We also discuss the implications of our results for atomic transitions and make comparison with a class of models based on the gauge group SU(2)/sub L/ x SU(2)/sub R/ x U(1) that has an absence of parity violation in atoms in the lowest order.