Abstract
We now know firmly that neutrinos have tiny masses, but in the minimal Standard Model there is no natural sources for such tiny masses. On the other hand, the extra heavy Z^{\prime 0} requires the extra Higgs field, the particle generating the mass. Here I propose that the previous 2+2 Higgs scenario could be a natural framework for mass generations for both the neutrinos and the extra Z^{\prime)}. These particles are classified as the "dark matter". Hopefully all the couplings to the "visible" matter are through the neutrinos and the extra Z^{\prime 0}, explaining naturally why the dark matter is so dark to see.
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