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Testing the seesaw mechanisms via displaced right-handed neutrinos from a light scalar at the HL-LHC

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arxiv 2204.03819 v2 pith:5A2OHJJH submitted 2022-04-08 hep-ph

Wei Liu , Jiale Li , Jing Li , Hao Sun This is my paper · ORCID
classification hep-ph
keywords neutrinosright-handedscalardisplacedseesawatlashiggshl-lhc
verification ladder T0 review T1 audit T2 compute T3 formal
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abstract

We investigate the pair production of right-handed neutrinos from the decay of a light $B-L$ scalar in the $U(1)_{B-L}$ model. The $B-L$ scalar mixes to the SM Higgs, and the physical scalar is required to be lighter than the observed Higgs. The produced right-handed neutrinos are predicted to be long-lived according to the type-I seesaw mechanism, and yield potentially distinct signatures such as displaced vertex and time-delayed leptons at the CMS/ATLAS/LHCb, as well as signatures at the far detectors including the CODEX-b, FACET, FASER, MoEDAL-MAPP and MATHUSLA. We analyze the sensitivity reach at the HL-LHC for the right-handed neutrinos with masses of 2.5 $\sim$ 30 GeV, showing that the active-sterile mixing to muons can be probed to $V_{\mu N} \sim 10^{-5}$ at the CMS/ATLAS/LHCb using the displaced vertex searches, and one magnitude lower at the MATHUSLA/CMS using time-delayed leptons searches, reaching the parameter space interesting for type-I seesaw mechanisms.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Revealing Neutrino Mass Ordering at CEPC and FCC-ee

    hep-ph 2026-01 conditional novelty 6.0 of 10

    In the minimal two-HNL seesaw, heavy neutral lepton flavor mixings encode the normal vs inverted neutrino mass ordering, and CEPC/FCC-ee could distinguish them for total mixing U_tot^2 ≳ 10^-6.

  2. Right-handed neutrino production through first-generation leptoquarks

    hep-ph 2024-12 conditional novelty 5.0 of 10

    At the HL-LHC, first-generation leptoquarks decaying to right-handed neutrinos are discovered most efficiently through indirect t-channel production, reaching leptoquark masses of roughly 3 to 10 TeV when the new coup...

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