{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.146757.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2763130"}},{"@id":"https://doi.org/10.1103/PhysRevD.110.012004","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"A search for heavy neutral leptons (HNLs) decaying in the CMS muon system is presented. A data sample is used corresponding to an integrated luminosity of 138\\fbinv of proton-proton collisions at $\\sqrt{s}=13\\TeV$, recorded at the CERN LHC in 2016--2018. Decay products of long-lived HNLs could interact with the shielding materials in the CMS muon system and create hadronic and electromagnetic showers detected in the muon chambers. This distinctive signature provides a unique handle to search for HNLs with masses below 4\\GeV and proper decay lengths of the order of meters. The signature is sensitive to HNL couplings to all three generations of leptons. Candidate events are required to contain a prompt electron or muon originating from a vertex on the beam axis and a displaced shower in the muon chambers. No significant deviations from the standard model background expectation are observed. In the electron (muon) channel, the most stringent limits to date are set for HNLs in the mass range of 2.1--3.0 (1.9--3.3)\\GeV, reaching mixing matrix element squared values as low as $8.6\\,(4.6) \\times10^{-6}$.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t1","@type":"Dataset","description":"Distribution of $N_{hits}$ and $\\Delta\\phi_{lep}$ for DT clusters and CSC clusters in the electron channel. Signal distribution of a Majorana...","name":"Figure2 - CSC N hits"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t2","@type":"Dataset","description":"Distribution of $N_{hits}$ and $\\Delta\\phi_{lep}$ for DT clusters and CSC clusters in the electron channel. Signal distribution of a Majorana...","name":"Figure2 - DT N hits"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t3","@type":"Dataset","description":"Distribution of $N_{hits}$ and $\\Delta\\phi_{lep}$ for DT clusters and CSC clusters in the electron channel. Signal distribution of a Majorana...","name":"Figure2 - DT dphi"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t4","@type":"Dataset","description":"Comparison of hits distributions for events with muons from \\zmm between data and simulation, for CSC clusters (left) and DT...","name":"Figure4 - CSC clusters"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t5","@type":"Dataset","description":"Comparison of hits distributions for events with muons from \\zmm between data and simulation, for CSC clusters (left) and DT...","name":"Figure4 - DT clusters"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t6","@type":"Dataset","description":"The expected and observed number of events in the signal region (bin D) of different event categories. Signal yields of...","name":"Figure5"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t7","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VN\u03bc|2 as functions of the HNL mass(mN) for a Majorana HNL. For...","name":"Figure6 - Majorana Muon"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t8","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VN\u03bc|2 as functions of the HNL mass(mN) for a Dirac HNL. For...","name":"Figure6 - Dirac muon"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t9","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VNe|2 as functions of the HNL mass(mN) for a Majorana HNL. For...","name":"Figure6 - Majorana electron"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t10","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VNe|2 as functions of the HNL mass(mN) for a Dirac HNL. For...","name":"Figure6 - Dirac electron"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t11","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VNtau|2 as functions of the HNL mass(mN) for a Majorana HNL. For...","name":"Figure6 - Majorana tau"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t12","@type":"Dataset","description":"Expected and observed upper 95% CL limits on |VNtau|2 as functions of the HNL mass(mN) for a Dirac HNL. For...","name":"Figure6 - Dirac tau"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t13","@type":"Dataset","description":"The largest values of the Majorana HNL mass that are excluded at 95% CL are shown as a function of...","name":"Figure7 - Majorana 1.5 GeV"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t14","@type":"Dataset","description":"The largest values of the Dirac HNL mass that are excluded at 95% CL are shown as a function of...","name":"Figure7 - Dirac 1.5 GeV"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t15","@type":"Dataset","description":"The largest values of the Majorana HNL mass that are excluded at 95% CL are shown as a function of...","name":"Figure7 - Majorana ctau 1m"},{"@id":"https://doi.org/10.17182/hepdata.146757.v1/t16","@type":"Dataset","description":"The largest values of the Dirac HNL mass that are excluded at 95% CL are shown as a function of...","name":"Figure7 - Dirac ctau 1m"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2763130?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/146757"}],"inLanguage":"en","name":"Search for long-lived heavy neutral leptons decaying in the CMS muon detectors in proton-proton collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2763130?version=1","version":1}