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Long-lived heavy neutrinos from Higgs decays

Deppisch, FF; Liu, W; Mitra, M; (2018) Long-lived heavy neutrinos from Higgs decays. Journal of High Energy Physics (8) , Article 181. 10.1007/JHEP08(2018)181. Green open access

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Abstract

We investigate the pair-production of right-handed neutrinos via the Standard Model (SM) Higgs boson in a gauged B − L model. The right-handed neutrinos with a mass of few tens of GeV generating viable light neutrino masses via the seesaw mechanism naturally exhibit displaced vertices and distinctive signatures at the LHC and proposed lepton colliders. The production rate of the right-handed neutrinos depends on the mixing between the SM Higgs and the exotic Higgs associated with the B − L breaking, whereas their decay length depends on the active-sterile neutrino mixing. We focus on the displaced leptonic final states arising from such a process, and analyze the sensitivity reach of the LHC and proposed lepton colliders in probing the active-sterile neutrino mixing. We show that mixing to muons as small as VμN ≈ 10⁻⁷ can be probed at the LHC with 100 fb⁻¹ and at proposed lepton colliders with 5000 fb⁻¹. The future high luminosity run at LHC and the proposed MATHUSLA detector may further improve this reach by an order of magnitude.

Type: Article
Title: Long-lived heavy neutrinos from Higgs decays
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/JHEP08(2018)181
Publisher version: https://doi.org/10.1007/JHEP08(2018)181
Language: English
Additional information: © The Author(s) 2018. This article is published under an open access license (https://creativecommons.org/licenses/by/4.0/).
Keywords: Beyond Standard Model, Neutrino Physics, Higgs Physics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10055746
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