Branching ratios of the Higgs as a function of its mass in SM4 with stable fourth-generation neutrino of mass GeV and its heavier partner of mass (a) GeV and (b) . Red thick lines represent decays into (red solid), (dashed), and (dotted). Black lines represent decays into (solid) and (dashed). Blue lines represent decays into (solid) and (dashed). Other decays have smaller branching ratios and are not shown. Plots from [8].
