Long-lived heavy neutral leptons with a displaced shower signature at CMS

Abstract

We study the LHC discovery potential in the search for heavy neutral leptons (HNL) with a new signature: a displaced shower in the CMS muon detector, giving rise to a large cluster of hits forming a displaced shower. A new Delphes module is used to model the CMS detector response for such displaced decays. We reinterpret a dedicated CMS search for neutral long-lived particles decaying in the CMS muon endcap detectors for the minimal HNL scenario. We demonstrate that this new strategy is particularly sensitive to active-sterile mixings with $\tau$ leptons, due to hadronic $\tau$ decays. HNL masses between $\sim 1-6$ GeV can be accessed for mixings as low as $|V_{\tau N}{|}^2\sim 10^{-7}$, probing unique regions of parameter space in the $\tau$ sector.

16 pages, 3 figures. Minor edits in v2 and extra references; matches version accepted for publication in JHEP

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Cited by in corpus (10)

• Phenomenology of the simplest linear seesaw mechanism
• Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Energetic long-lived particles in the CMS muon chambers
• Vectorlike leptons and long-lived bosons at the LHC
• The Type-I Seesaw family
• Probing light sterile neutrinos in left-right symmetric models with displaced vertices and neutrinoless double beta decay
• Leptonic neutral-current probes in a short-distance DUNE-like setup
• Long-lived particle phenomenology in one-loop neutrino mass models with dark matter
• Impact of unitarity violation on sensitivity of the leptonic CP phase at Hyper-Kamiokande and DUNE
• Revisiting lepton flavor violation: $\tau$ and meson decays