Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Zhokin, A.2025-04-132025-04-1320251029-8479https://doi.org/10.1007/JHEP02(2025)036Benato, Lisa/0000-0001-5135-7489; Heikkila, Jaana/0000-0002-0538-1469; Niedziela, Jeremi/0000-0002-9514-0799; Selvaggi, Michele/0000-0002-5144-9655; Meena, Meena/0000-0003-4536-3967; Cappati, Alessandra/0000-0003-4386-0564; Sagir, Sinan/0000-0002-2614-5860; Konecki, Marcin/0000-0001-9482-4841; Chokheli, Davit/0000-0001-7535-4186; Gomez-Ceballos, Guillelmo/0000-0003-1683-9460; Blumenfeld, Barry/0000-0003-1150-1735; Yoo, Hwidong/0000-0002-3892-3500; Haller, Johannes/0000-0001-9347-7657; Fernandez Bedoya, Cristina/0000-0001-8057-9152; Waltenberger, Wolfgang/0000-0002-6215-7228; Verdier, Patrice/0000-0003-3090-2948; Sarkar, Tanmay/0000-0003-0582-4167; Canelli, Florencia/0000-0001-6361-2117; Cousins, Robert/0000-0002-5963-0467; Dutta, Valentina/0000-0001-5958-829X; Dozen, Candan/0000-0002-4301-634X; Padula, Sandra S./0000-0003-3071-0559; Jafari, Abideh/0000-0001-7327-1870; D'Enterria, David/0000-0002-5754-4303; 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Hamel De Monchenault, Gautier/0000-0002-3872-3592; Aarrestad, Thea/0000-0002-7671-243X; Sandro, Fonseca De Souza/0000-0001-7830-0837; Garutti, Erika/0000-0003-0634-5539; Aruta, Caterina/0000-0001-9524-3264; Legger, Federica/0000-0003-1400-0709; Moraes, Arthur/0000-0002-5157-5686; Vami, Tamas Almos/0000-0002-0959-9211; Malgeri, Luca/0000-0002-0113-7389; Manca, Elisabetta/0000-0001-8946-655X; Flaecher, Henning/0000-0002-5371-941X; Kanuganti, Ankush Reddy/0000-0002-0789-1200; Evdokimov, Olga/0000-0002-1250-8931; Martinez Ruiz Del Arbol, Pablo/0000-0002-7737-5121; Gonzalez Caballero, Isidro/0000-0002-8087-3199; Zghiche, Amina/0000-0002-1178-1450; Tully, Christopher/0000-0001-6771-2174; Sculac, Toni/0000-0002-9578-4105; Bakhshiansohi, Hamed/0000-0001-5741-3357; Bhowmik, Sandeep/0000-0003-1260-973X; Brooke, James/0000-0003-2529-0684; De Guio, Federico/0000-0001-5927-8865; Chatterjee, Suman/0000-0003-2660-0349; Vischia, Pietro/0000-0002-7088-8557; Ko, Sanghyun/0000-0003-4377-9969; Sharma, Ashish/0000-0002-0688-923X; Hatakeyama, Kenichi/0000-0002-6012-2451; Cumalat, John/0000-0002-6032-5857; Figueiredo, Diego/0000-0003-2514-6930; Yoon, Inseok/0000-0002-3491-8026; Felcini, Marta/0000-0002-2051-9331; Litov, Leandar/0000-0002-8511-6883; Gadallah, Mahmoud Moussa Abdelkhalek/0000-0002-8305-6661; Dubinin, Mikhail/0000-0002-7766-7175; Theofilatos, Konstantinos/0000-0001-8448-883XA search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb(-1) collected at root s = 13TeV with the CMS detector at the CERN LHC is presented. Events are selected with a charged lepton originating from the primary vertex associated with the proton-proton interaction, as well as a second charged lepton and a hadronic jet associated with a secondary vertex that corresponds to the semileptonic decay of a long-lived HNL. No excess of events above the standard model expectation is observed. Exclusion limits at 95% confidence level are evaluated for HNLs that mix with electron and/or muon neutrinos. Limits are presented in the mass range of 1-16.5 GeV, with excluded square mixing parameter values reaching as low as 2 x 10(-7). For masses above 11 GeV, the presented limits exceed all previous results in the semileptonic decay channel, and for some of the considered scenarios are the strongest to date.eninfo:eu-repo/semantics/openAccessBeyond Standard ModelHadron-Hadron ScatteringArticle10.1007/JHEP02(2025)0362-s2.0-105001150339