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We require that the primordial baryon asymmetry is not washed out in theseesaw model compatible with the recent results of WMAP and the neutrinooscillation experiments including the first results of KamLAND. We find thatonly the case of the normal neutrino mass hierarchy with an approximate$L_{e}$-symmetry satisfies the requirement. We further derive, depending on thesigns of neutrino mass eigenvalues, three types of neutrino mass matrixes,where the values of each element are rather precisely fixed.Comment: 21pages; added reference

Protecting the primordial baryon asymmetry in the seesaw model compatible with WMAP and KamLAND