Search for long-lived heavy neutral leptons with displaced vertices in proton-proton collisions at root s=13 TeV
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
A search for heavy neutral leptons (HNLs), the right-handed Dirac or Majorana neutrinos, is performed in final states with three charged leptons (electrons or muons) using proton-proton collision data collected by the CMS experiment at s√ = 13 TeV at the CERN LHC. The data correspond to an integrated luminosity of 138 fb−1. The HNLs could be produced through mixing with standard model neutrinos ν. For small values of the HNL mass (<20 GeV) and the square of the HNL-ν mixing parameter (10−7–10−2), the decay length of these particles can be large enough so that the secondary vertex of the HNL decay can be resolved with the CMS silicon tracker. The selected final state consists of one lepton emerging from the primary proton-proton collision vertex, and two leptons forming a displaced, secondary vertex. No significant deviations from the standard model expectations are observed, and constraints are obtained on the HNL mass and coupling strength parameters, excluding previously unexplored regions of parameter space in the mass range 1–20 GeV and squared mixing parameter values as low as 10−7.
Date Issued
2022-07-14
Date Acceptance
2022-06-03
Citation
The Journal of High Energy Physics, 2022, 2022 (7)
ISSN
1029-8479
Publisher
Scuola Internazionale Superiore di Studi Avanzati (SISSA)
Journal / Book Title
The Journal of High Energy Physics
Volume
2022
Issue
7
Copyright Statement
Open Access, Copyright CERN,
for the benefit of the CMS Collaboration.
Article funded by SCOAP3
.
for the benefit of the CMS Collaboration.
Article funded by SCOAP3
.
License URL
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000826915800001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Particles & Fields
Physics
Beyond Standard Model
Hadron-Hadron Scattering
NEUTRINOS
MASSES
Publication Status
Published
Article Number
ARTN 081