In the simplest linear seesaw model, astrophysical, unitarity, and LHC constraints force a compressed scalar spectrum and permit the 125 GeV Higgs to decay invisibly into majorons with branching ratios up to about 20%.
New Higgs Signatures in Supersymmetry with Spontraneously Broken R Parity"
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abstract
Higgs production from $Z$ decay in supersymmetry with spontaneous broken R parity proceeds mostly by the Bjorken process as in the standard model. However, the corresponding production rates can be weaker than in the standard model (SM), especially in the low mass region. This will substantially weaken the Higgs boson mass limits derived from LEP1. More strikingly, the main Higgs decay channel is "invisible", over most of the mass range accessible to LEP1, leading to events with large missing energy carried by majorons. This possibility should be taken into account in the planning of Higgs boson search strategies not only at LEP but also at high energy supercolliders.
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Electroweak Breaking and Higgs Boson Profile in the Simplest Linear Seesaw Model
In the simplest linear seesaw model, astrophysical, unitarity, and LHC constraints force a compressed scalar spectrum and permit the 125 GeV Higgs to decay invisibly into majorons with branching ratios up to about 20%.