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

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...

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Bibliographic Details
Published in:arXiv.org 2023-01
Main Authors: Cottin, Giovanna, Helo, Juan Carlos, Hirsch, Martin, Peña, Cristián, Wang, Christina, Xie, Si
Format: Article
Language:English
Subjects:
Displacement
Large Hadron Collider
Leptons
Muons
Particle decay
Solenoids
Online Access:Get full text
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Summary: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2210.17446