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In the context of minimal supersymmetric standard model that embeds
the seesaw mechanism (MSSM-RN), superpotential contains
two distinct mass scales: the $\mu$ parameter and the right-handed
neutrino mass $M_N$. To have a successful electroweak symmetry
breaking, the $\mu$ parameter must be stabilized at the electroweak scale.
On the other hand, to explain the small masses of the light neutrinos
with relatively large Yukawa couplings, the right-handed neutrino masses
should be much larger than the electroweak scale.
In this work we attempt to construct a model by
which both parameters are generated simultaneously. The model we
build utilizes lepton number conservation and continuous $R$
invariance as two fundamental global symmetries to forbid bare
$\mu$ and $M_N$ appearing in the superpotential, and induces them
at their right scales via spontaneous breakdown of the global
symmetries and the supergravity. We discuss briefly certain
phenomenological implications of the model.
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