Abstract
We analyze a novel signature of the type II seesaw model - same-sign tetra-lepton signal arising from the mixing of neutral Higgs bosons and their subsequent decays to singly and doubly charged Higgs bosons. For this, we consider wide ranges of the triplet vacuum expectation value (vev) and Yukawa couplings, that are consistent with the observed neutrino masses and mixing as well as the LHC search limits. We find that a doubly charged Higgs boson with mass around 250 GeV and triplet vev around $10^{-4}-10^{-2}$ GeV can give significantly large number of events through it decay to same-sign $W$ gauge bosons at High-Luminosity LHC with $3000 \text{fb}^{-1}$ of data. We also pursue the analysis for a future hadron collider with the c.m. energy of 100 TeV. Considering a heavy Higgs boson around 900 GeV and an intermediate region of the triplet vev, where both same-sign dilepton and gauge boson decays can occur, we identify a limited range of the parameters where the number of same-sign tetra-lepton events are as large as 1000.
Highlights
After the discovery of the Standard Model (SM) Higgs boson, one of the key questions that still remains unexplained is the origin of light neutrino masses and mixings
We analyze a novel signature of the type-II seesaw model—a same-sign tetralepton signal arising from the mixing of neutral Higgs bosons and their subsequent decays to singly and doubly charged Higgs bosons
Considering a heavy Higgs boson of around 900 GeV and an intermediate region of the triplet vev, where both same-sign dilepton and gauge boson decays can occur, we identify a limited range of the parameters where the number of same-sign tetralepton events are as large as 1000
Summary
After the discovery of the Standard Model (SM) Higgs boson, one of the key questions that still remains unexplained is the origin of light neutrino masses and mixings. Most of the works in the literature explored the dilepton or gauge boson decay modes of the doubly charged Higgs leading to multilepton final states. Higgs into a doubly charged Higgs, the model can lead to a very unique signature, same-sign tetralepton final states This was first proposed in [56] and explored for the lower triplet vev, where dilepton decay is predominant. We consider a wide range of the triplet vev, focusing on gauge boson decay modes, and explore the signature for 14 TeV LHC. For the higher range of the triplet vev, as the LHC constraint on the mass of doubly charged Higgs is relatively relaxed [40], we perform the analysis for the lighter Higgs state, as low as MHÆÆ ∼ 247 GeV.
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