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 $$H^{±±}_{L}$$, 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 ƒL of the triplet to the charged leptons, wherein a relatively light $$H^{±±}_{L}$$ 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 $$H^{±±}_{L} → ℓ^±_αℓ^±_β$$ could probe a broad parameter space with 10-10 ≲ |ƒL| ≲ 10-6 and 45.6 GeV<$$M_{H^{±±}_{L}}$$≲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 $$H^{±±}_{R}$$ 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.
Bhupal Dev, P. S. and Zhang, Yongchao. "Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions." Journal of High Energy Physics (Online), vol. 2018, no. 10, Oct. 2018. https://doi.org/10.1007/jhep10(2018)199
Bhupal Dev, P. S., & Zhang, Yongchao (2018). Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions. Journal of High Energy Physics (Online), 2018(10). https://doi.org/10.1007/jhep10(2018)199
Bhupal Dev, P. S., and Zhang, Yongchao, "Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions," Journal of High Energy Physics (Online) 2018, no. 10 (2018), https://doi.org/10.1007/jhep10(2018)199
@article{osti_1612803,
author = {Bhupal Dev, P. S. and Zhang, Yongchao},
title = {Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions},
annote = {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 $H^{±±}_{L}$, 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 ƒL of the triplet to the charged leptons, wherein a relatively light $H^{±±}_{L}$ 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 $H^{±±}_{L} → ℓ^±_αℓ^±_β$ could probe a broad parameter space with 10-10 ≲ |ƒL| ≲ 10-6 and 45.6 GeV+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 $H^{±±}_{R}$ 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.},
doi = {10.1007/jhep10(2018)199},
url = {https://www.osti.gov/biblio/1612803},
journal = {Journal of High Energy Physics (Online)},
issn = {ISSN 1029-8479},
number = {10},
volume = {2018},
place = {United States},
publisher = {Springer Berlin},
year = {2018},
month = {10}}