Search for long-lived heavy neutral leptons in signatures with one prompt muon and a secondary vertex formed by two non-prompt muons in proton-proton collisions at √s = 13 and 13.6 TeV
Abstract
A search for heavy neutral leptons (HNLs) in the decay of W bosons is performed in final states with three muons, with one originating promptly from the primary interaction vertex and the other two stemming from a common secondary vertex. The analyzed proton-proton collision data correspond to an integrated luminosity of 138 fb−1 recorded at a centre-of-mass energy of 13 TeV in 2016−2018, and of 34.6 fb−1 recorded at 13.6 TeV in 2022. The analysis strategy is optimized for large HNL decay lengths by requiring highly non-prompt muons forming a secondary vertex far from the beam line, and hence reconstructed only in the muon system of the CMS experiment at the CERN LHC. This enhances the analysis reach in the high HNL lifetime region, corresponding to low HNL masses (2−4 GeV) and small mixing parameters with the standard model neutrinos (10−6−10−5), where prompt and tracker-based non-prompt analyses have limited acceptance. No excess over the background prediction is found. Under the Majorana HNL hypothesis, exclusion limits at 95\% confidence level are set on the HNL mixing parameter as functions of the HNL mass in the range of 1−5 GeV.
Related
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- Search for compressed electroweak SUSY production in final states with two τ-leptons in √s = 13 and $13.6$ TeV pp collisions with the ATLAS detector
BibTeX
@misc{collaboration2026search,
title = {{Search for long-lived heavy neutral leptons in signatures with one prompt muon and a secondary vertex formed by two non-prompt muons in proton-proton collisions at $\sqrts$ = 13 and 13.6 TeV}},
author = {CMS Collaboration},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.40911},
eprint = {2610.40911},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.40911},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Search for long-lived heavy neutral leptons in signatures with one prompt muon and a secondary vertex formed by two non-prompt muons in proton-proton collisions at √s = 13 and 13.6 TeV
AU - CMS Collaboration
PY - 2026
DA - 2026/10/29
PB - arXiv
DO - 10.48550/arxiv.2610.40911
UR - https://arxiv.org/abs/2610.40911
AB - A search for heavy neutral leptons (HNLs) in the decay of W bosons is performed in final states with three muons, with one originating promptly from the primary interaction vertex and the other two stemming from a common secondary vertex. The analyzed proton-proton collision data correspond to an integrated luminosity of 138 fb^−1 recorded at a centre-of-mass energy of 13 TeV in 2016−2018, and of 34.6 fb^−1 recorded at 13.6 TeV in 2022. The analysis strategy is optimized for large HNL decay lengths by requiring highly non-prompt muons forming a secondary vertex far from the beam line, and hence reconstructed only in the muon system of the CMS experiment at the CERN LHC. This enhances the analysis reach in the high HNL lifetime region, corresponding to low HNL masses (2−4 GeV) and small mixing parameters with the standard model neutrinos (10^−6−10^−5), where prompt and tracker-based non-prompt analyses have limited acceptance. No excess over the background prediction is found. Under the Majorana HNL hypothesis, exclusion limits at 95\% confidence level are set on the HNL mixing parameter as functions of the HNL mass in the range of 1−5 GeV.
ER -