Abstract
The CP nonconserving portion of the gauge-field effective action for an even number of left-handed SU(2) fermion doublets, with nonzero chemical potentials ..mu../sup i/, is calculated to leading order in the inverse temperature, T/sup -1/. It is shown to be i summation/sub i/ (..mu../sup 1//T)W(A), where W(A) is the Chern-Simons topological mass term. This result is also shown to be a consequence of the U(1)/sub L/ anomaly at zero temperature, but with ..mu..not =0. Because of the i in front of the Chern-Simons term, this produces magnetic screening only if ..mu.. is complex.
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