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The type II seesaw mechanism is an attractive way to generate the observedlight neutrino masses. It postulates a SU(2)$_\mathrm{L}$-triplet scalar field,which develops an induced vacuum expectation value after electroweak symmetrybreaking, giving masses to the neutrinos via its couplings to the leptonSU(2)$_\mathrm{L}$-doublets. When the components of the triplet field havemasses around the electroweak scale, the model features a rich phenomenology.We discuss the current allowed parameter space of the minimal low scale type IIseesaw model, taking into account all relevant constraints, including chargedlepton flavour violation as well as collider searches. We point out that thesymmetry protected low scale type II seesaw scenario, where an approximate"lepton number"-like symmetry suppresses the Yukawa couplings of the triplet tothe lepton doublets, is still largely untested by the current LHC results. Inpart of this parameter space the triplet components can be long-lived,potentially leading to a characteristic displaced vertex signature where thedoubly-charged component decays into same-sign charged leptons. By performing adetailed analysis at the reconstructed level we find that already at thecurrent run of the LHC a discovery would be possible for the consideredparameter point, via dedicated searches for displaced vertex signatures. Thediscovery prospects are further improved at the HL-LHC and the FCC-hh/SppC.

Low scale type II seesaw: Present constraints and prospects for displaced vertex searches