Abstract
We calculate the splitting between fermion and antifermion effective masses in high temperature gauge theories in the presence of a nonvanishing chemical potential due to the $\mathrm{CP}$-asymmetric fermionic background. In particular we consider the case of left-handed leptons in the SU(2)\ensuremath{\bigotimes}U(1) theory when the temperature is above 250 GeV and the gauge symmetry is restored.
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