Charged Lepton Flavor Violation in the Semi-Constrained NMSSM with Right-Handed Neutrinos

Abstract

We study the μ\to e γdecay in the Z_3-invariant next-to-minimal supersymmetric (SUSY) Standard Model (NMSSM) with superheavy right-handed neutrinos. We assume that the soft SUSY breaking parameters are generated at the GUT scale, not universally as in the minimal supergravity scenario but in such a way that those soft parameters which are specific to the NMSSM can differ from the soft parameters which involve only the MSSM fields while keeping the universality at the GUT scale within the soft parameters for the MSSM and right-handed neutrino fields. We call this type of boundary conditions "semi-constrained". In this model, the lepton-flavor-violating off-diagonal elements of the slepton mass matrix are induced by radiative corrections from the neutrino Yukawa couplings, just like as in the MSSM extended with the right-handed neutrinos, and these off-diagonal elements induce sizable rates of μ\to e γdepending on the parameter space. Since this model has more free parameters than the MSSM, the parameter region favored from the Higgs boson mass can slightly differ from that in the MSSM. We show that there is a parameter region in which the μ\to e γdecay can be observable in the near future even if the SUSY mass scale is about 4 TeV.

arXiv comment16 pages, 3 figures. v2: reference added, typos corrected. v3: put more emphasis on the difference from the MSSM + ν_R model, reference added, typos corrected, version to appear in Phys. Lett. B

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• A Novel Scenario in the Semi-constrained NMSSM
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