Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Zhokin, A.2025-05-312025-05-3120241029-847910.1007/JHEP06(2024)183https://doi.org/10.1007/JHEP06(2024)183https://hdl.handle.net/20.500.14517/7927Perez-Calero Yzquierdo, Antonio/0000-0003-3036-7965; Tapper, Alexander/0000-0003-4543-864X; Colaleo, Anna/0000-0002-0711-6319; Navarrete Ramos, Efren/0000-0002-5180-4020; Bunkowski, Karol/0000-0001-6371-9336; Martinez Rivero, Celso/0000-0002-3224-956X; Ramos, Dayron/0000-0002-7165-1017; Battilana, Carlo/0000-0002-3753-3068; Della Ricca, Giuseppe/0000-0003-2831-6982; Dincer, Gizem Gul/0009-0001-1997-2841; Radogna, Raffaella/0000-0002-1094-5038; Hall, Geoffrey/0000-0002-6299-8385; Rossi Tisbeni, Simone/0000-0001-6776-285X; Giommi, Luca/0000-0003-3539-4313; Calderon, Dr. Alicia/0000-0002-7205-2040; Pesaresi, Mark/0000-0002-9759-1083; Wuchterl, Sebastian/0000-0001-9955-9258; Felcini, Marta/0000-0002-2051-9331A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at root s = 13 TeV is presented. The data sample corresponds to an integrated luminosity of 41.6 fb(-1) collected in 2018 by the CMS experiment at the CERN LHC, using a dedicated data stream that enhances the number of recorded events containing B mesons. The search probes heavy neutrinos with masses in the range 1 < m(N) < 3 GeV and decay lengths in the range 10(-2) < c tau(N) < 10(4) mm, where tau(N) is the N proper mean lifetime. Signal events are defined by the signature B -> l(B)NX; N -> l(+/-)pi(-/+), where the leptons l(B) and l can be either a muon or an electron, provided that at least one of them is a muon. The hadronic recoil system, X, is treated inclusively and is not reconstructed. No significant excess of events over the standard model background is observed in any of the l(+/-)pi(-/+) invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, vertical bar V-N vertical bar(2), and on c tau(N) are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit vertical bar V-N vertical bar(2) < 2.0 x 10(-5) is obtained at m(N) = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on vertical bar V-N vertical bar(2) for masses 1 < m(N) < 1.7 GeV are the most stringent from a collider experiment to date.eninfo:eu-repo/semantics/openAccessBeyond Standard ModelHadron-Hadron ScatteringLifetimeArticleQ1Q16WOS:001311120600001