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Search for long-lived heavy neutral leptons in proton-proton collision events with a lepton-jet pair associated with a secondary vertex at s = 13 TeV

par Hayrapetyan, A.;Bilin, Bugra ;Clerbaux, Barbara ;Das, Aloke Kumar ;De Lentdecker, Gilles ;Evard, Hugues ;Favart, Laurent ;Gianneios, Paraskevas ;Jaramillo Gallego, Johny ;Khalilzadeh, Ali ;Mahdavikhorrami, Mostafa ;Malara, Andrea ;Paredes, Sergio ;Shahzad, Muhammad Aamir ;Vanden Bemden, Max ;Vander Velde, Catherine ;Vanlaer, Pascal ; [et al.]
Référence Journal of High Energy Physics, 02, 036
Publication Publié, 2025-10-01

Article révisé par les pairs

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Résumé :

A search for long-lived heavy neutral leptons (HNLs) using proton-proton collision data corresponding to an integrated luminosity of 138 fb−1 collected at s = 13 TeV 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 × 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.