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Paper IPM / P / 8019  


Abstract:  
In the context of minimal supersymmetric standard model that embeds
the seesaw mechanism (MSSMRN), superpotential contains
two distinct mass scales: the μ parameter and the righthanded
neutrino mass M_{N}. To have a successful electroweak symmetry
breaking, the μ 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 righthanded 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
μ 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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