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

Boos, E.; Bunichev, V.; Dubinin, M.; Dudko, L.; Ershov, A.A.; Gribushin, A.; Klyukhin, V.; Kodolova, O.; Obraztsov, S.; Perfilov, M.; Savrin, V.; Vorotnikov, G.A.; CMS, C.

Авторы: Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Perfilov M., Savrin V., Vorotnikov G.A., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2025
Номер: 02
Год издания: 2025
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 036
DOI: 10.1007/JHEP02(2025)036
Аннотация: 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.
Добавил в систему: Клюхин Вячеслав Иванович

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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 TeVстатья Исследовательская статья

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