Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at √s = 13 TeV

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

Авторы: Belyaev A.V., Boos E., Bunichev V., Dubinin M., Dudko L., Ershov A.A., Gribushin A., Klyukhin V., Kodolova O., Obraztsov S., Perfilov M., Petrushanko S.V., Savrin V., CMS Collaboration
Журнал: Journal of High Energy Physics
Том: 2024
Номер: 06
Год издания: 2024
Издательство: IOP Publishing
Местоположение издательства: [Bristol, UK], England
Первая страница: 183
DOI: 10.1007/JHEP06(2024)183
Аннотация: : A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at √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 < cτ_N < 10^4 mm, where τ_N is the N proper mean lifetime. Signal events are defined by the signature B → ℓ_B NX; N → ℓ±π∓, 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±π∓ invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, |V_N|^2, and on cτN are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit |V_N|^2 < 2.0 × 10^−5 is obtained at m_N = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on |V_N|^2 for masses 1 < m_N < 1.7 GeV are the most stringent from a collider experiment to date.
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Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at √s = 13 TeVстатья Исследовательская статья

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