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We study lepton asymmetry evolution in plasma of the early Universe beforethe electroweak phase transition (EWPT) accounting for chirality flip processesvia Higgs decays (inverse decays) entering equilibrium at temperatures belowT_RL ~ 10 TeV, T_EW < T < T_RL. We solve appropriate kinetic equations forleptons and Higgs bosons taking into account the lepton number violation due toAbelian anomalies for right and left electrons and neutrinos in theself-consistent hypercharge field obeying Maxwell equations modified by thecontribution of the Standard Model of electroweak interactions. The violationof left lepton numbers and the corresponding violation of the baryon number dueto sphaleron processes in symmetric phase is taken into account as well.Assuming the Chern-Simons wave configuration of the seed hypercharge field, weget the estimates of baryon and lepton asymmetries evolved from the primordialright electron asymmetry existing alone as partial asymmetry at T > T_RL. Onefinds a strong dependence of the asymmetries on the Chern-Simons wave number.We predict a nonzero chiral asymmetry \Delta \mu = \mu_e_R - \mu_e_L \neq 0 inthis scenario evolved down to the EWPT moment that can be used as an initialvalue for the Maxwellian field evolution after EWPT.

Lepton asymmetry growth in the symmetric phase of an electroweak plasma with hypermagnetic fields versus its washing out by sphalerons