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 τ leptons, due to hadronic τ decays. HNL masses between ~ 1–6 GeV can be accessed for mixings as low as |VτN|2~10−7, probing unique regions of parameter space in the τ sector.

Details

Title
Long-lived heavy neutral leptons with a displaced shower signature at CMS
Author
Cottin, Giovanna 1   VIAFID ORCID Logo  ; Helo, Juan Carlos 2   VIAFID ORCID Logo  ; Hirsch, Martin 3 ; Peña, Cristián 4 ; Wang, Christina 5 ; Xie, Si 6 

1  Universidad Adolfo Ibáñez, Departamento de Ciencias, Facultad de Artes Liberales, Santiago, Chile (GRID:grid.440617.0) (ISNI:0000 0001 2162 5606); Millennium Institute for Subatomic Physics at the High Energy Frontier (SAPHIR), Santiago, Chile (GRID:grid.440617.0) 
2  Universidad de La Serena, Departamento de Física, Facultad de Ciencias, La Serena, Chile (GRID:grid.19208.32) (ISNI:0000 0001 0161 9268); Millennium Institute for Subatomic Physics at the High Energy Frontier (SAPHIR), Santiago, Chile (GRID:grid.19208.32) 
3  AHEP Group, Instituto de Física Corpuscular — CSIC/Universitat de València, València, Spain (GRID:grid.5338.d) (ISNI:0000 0001 2173 938X) 
4  Fermi National Accelerator Laboratory, Batavia, USA (GRID:grid.417851.e) (ISNI:0000 0001 0675 0679) 
5  California Institute of Technology, Pasadena, USA (GRID:grid.20861.3d) (ISNI:0000000107068890) 
6  Fermi National Accelerator Laboratory, Batavia, USA (GRID:grid.417851.e) (ISNI:0000 0001 0675 0679); California Institute of Technology, Pasadena, USA (GRID:grid.20861.3d) (ISNI:0000000107068890) 
Pages
11
Publication year
2023
Publication date
Mar 2023
Publisher
Springer Nature B.V.
e-ISSN
10298479
Source type
Scholarly Journal
Language of publication
English
DOI
https://doi.org/10.1007/JHEP02(2023)011
ProQuest document ID
2784120877
Copyright
© The Author(s) 2023. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.