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Recently, it has been argued that in the supersymmetric extension of theseesaw-extended Standard Model, heavy right-handed neutrinos and sneutrinos maygive corrections as large as a few GeV to the mass of the lightest neutralCP-even Higgs boson, even if the soft supersymmetry-breaking parameters are oforder the electroweak scale. The presence of such large corrections wouldrender precise Higgs masses incalculable from measurable low-energy parameters.We show that this is not the case: decoupling is preserved in the appropriatesense and right-handed (s)neutrinos, if they exist, have negligible impact onthe physical Higgs masses.

Decoupling of the Right-handed Neutrino Contribution to the Higgs Mass in Supersymmetric Models