Type-II Seesaw Model and Multilepton Signatures at Hadron Colliders

Abstract

We investigate multilepton signatures, arising from the decays of doubly charged and singly charged Higgs bosons in the Type-II Seesaw model. Depending on the vacuum expectation value of the triplet $v_{\Delta }$, the doubly and singly charged Higgs bosons can decay into a large variety of multi-lepton final states. We explore all possible decay modes corresponding to different regimes of $v_{\Delta }$, that generate distinguishing four and five leptonic signatures. We focus on the 13 TeV Large Hadron Collider (LHC) and further extend the study to a very high energy proton-proton collider (VLHC) with a center-of-mass energy of 100 TeV. We find that a doubly charged Higgs boson of masses around 375 GeV can be discovered at immediate LHC runs. A heavier mass of 630 GeV can instead be discovered at the high-luminosity run of the LHC or at the VLHC with 30 ${\mathrm{fb}}^{-1}$.

21 pages, 10 figures

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• Revealing the origin of neutrino masses through the Type II Seesaw mechanism at high-energy muon colliders
• Associated production of SM Higgs with a photon in type-II seesaw models at the ILC
• High-energy colliders as a probe of neutrino properties