Dynamical inverse seesaw mechanism as a simple benchmark for electroweak breaking and Higgs boson studies

Understand

The Standard Model(SM) vacuum is unstable for the measured values of the top Yukawa coupling and Higgs mass.

• Here we study the issue of vacuum stability when neutrino masses are generated through spontaneous low-scale lepton number violation.
• In the simplest dynamical inverse seesaw, the SM Higgs has two siblings: a massive CP-even scalar plus a massless Nambu-Goldstone boson, called majoron.
• For TeV scale breaking of lepton number, Higgs bosons can have a sizeable decay into the invisible majorons.