{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.156846.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2902874"}},{"@id":"https://doi.org/10.1007/JHEP08(2025)156","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2025","description":"A first search is presented for vector-like leptons (VLLs) decaying into a light long-lived pseudoscalar boson and a standard model $\u03c4$ lepton. The pseudoscalar boson is assumed to have a mass below the $\u03c4^+\u03c4^-$ threshold, so that it decays exclusively into two photons. It is identified using the CMS muon system. The analysis is carried out using a data set of proton-proton collisions at a center-of-mass energy of 13 TeV collected by the CMS experiment in 2016-2018, corresponding to an integrated luminosity of 138 fb$^{-1}$. Selected events contain at least one pseudoscalar boson decaying electromagnetically in the muon system and at least one hadronically decaying $\u03c4$ lepton. No significant excess of data events is observed compared to the background expectation. Upper limits are set at 95% confidence level on the vector-like lepton production cross section as a function of the VLL mass and the pseudoscalar boson mean proper decay length. The observed and expected exclusion ranges of the VLL mass extend up to 700 and 670 GeV, respectively, depending on the pseudoscalar boson lifetime.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t1","@type":"Dataset","description":"The cluster reconstruction efficiency, including both DT and CSC clusters, as a function of the simulated r and |z| decay...","name":"Figure 2"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t2","@type":"Dataset","description":"Distributions of the number of hits in the cluster (Nhits) for the DT category in the signal region (SR). The...","name":"Figure 3a"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t3","@type":"Dataset","description":"Distributions of the number of hits in the cluster (Nhits) for the CSC category in the signal region (SR). The...","name":"Figure 3b"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t4","@type":"Dataset","description":"Distributions of the number of hits in the cluster (Nhits) for the DT category in the out-of-time (OOT) region. The...","name":"Figure 4a"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t5","@type":"Dataset","description":"Distributions of the number of hits in the cluster (Nhits) for the CSC category in the out-of-time (OOT) region. The...","name":"Figure 4b"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t6","@type":"Dataset","description":"The 95% CL observed and expected upper limits on the VLL production cross section as a function of the VLL...","name":"Figure 5a"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t7","@type":"Dataset","description":"The 95% CL observed and expected upper limits on the VLL production cross section as a function of the pseudoscalar...","name":"Figure 5b"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t8","@type":"Dataset","description":"The 95% CL observed upper limits on the VLL production cross section as a function of the VLL mass and...","name":"Figure 6 map"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t9","@type":"Dataset","description":"The 95% CL observed exclusion contour on the VLL production cross section as a function of the VLL mass and...","name":"Figure 6 contour"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t10","@type":"Dataset","description":"Selection efficiencies in the CSC category signal region (SR) for different signal hypothesis. The pseudoscalar mass is 2 GeV.","name":"Signal CutFlow Efficiency CSC Category"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t11","@type":"Dataset","description":"Selection efficiencies in the DT category signal region (SR) for different signal hypothesis. The pseudoscalar mass is 2 GeV.","name":"Signal CutFlow Efficiency DT Category"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t12","@type":"Dataset","description":"The cluster reconstruction efficiency, including both DT and CSC clusters, as a function of the simulated r and |z| decay...","name":"Signal Cluster Reconstruction Efficiency Map (mVLL=300 GeV)"},{"@id":"https://doi.org/10.17182/hepdata.156846.v2/t13","@type":"Dataset","description":"The cluster reconstruction efficiency, including both DT and CSC clusters, as a function of the simulated r and |z| decay...","name":"Signal Cluster Reconstruction Efficiency Map (mVLL=500 GeV)"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2902874?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/156846"}],"inLanguage":"en","name":"Search for vector-like leptons with long-lived particle decays in the CMS muon system 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/ins2902874?version=2","version":2}