Abstract
The type-II seesaw mechanism with an isospin-triplet scalar ΔL provides one of the most compelling explanations for the observed smallness of neutrino masses. The triplet contains a doubly-charged component \( {H}_{{}^L}^{\pm \pm } \), which dominantly decays to either same-sign dileptons or to a pair of W bosons, depending on the size of the triplet vacuum expectation value. However, there exists a range of Yukawa couplings fL of the triplet to the charged leptons, wherein a relatively light \( {H}_{{}^L}^{\pm \pm } \) tends to be long-lived, giving rise to distinct displaced-vertex signatures at the high-energy colliders. We find that the displaced vertex signals from the leptonic decays \( {H}_{{}^L}^{\pm \pm}\to {\ell}_{\alpha}^{\pm }{\ell}_{{}^{\beta}}^{\pm } \) could probe a broad parameter space with 10−10 ≲ |fL| ≲ 10−6 and \( 45.6\ GeV<{M}_{H_L^{\pm \pm }}\lesssim 200\ GeV \) at the high-luminosity LHC. Similar sensitivity can also be achieved at a future 1 TeV e+e− collider. The mass reach can be extended to about 500GeV at a future 100TeV proton-proton collider. Similar conclusions apply for the right-handed triplet \( {H}_{{}^R}^{\pm \pm } \) in the TeV-scale left-right symmetric models, which provide a natural embedding of the type-II seesaw. We show that the displaced vertex signals are largely complementary to the prompt same-sign dilepton pair searches at the LHC and the low-energy, high-intensity/precision measurements, such as neutrinoless double beta decay, charged lepton flavor violation, electron and muon anomalous magnetic moments, muonium-antimuonium oscillation and Møller scattering.
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Bhupal Dev, P.S., Zhang, Y. Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions. J. High Energ. Phys. 2018, 199 (2018). https://doi.org/10.1007/JHEP10(2018)199
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DOI: https://doi.org/10.1007/JHEP10(2018)199