Search for Long-Lived Heavy Neutrinos in the Decays of B Mesons Produced in Proton-Proton Collisions at √s = 13 TeV
Journal of High Energy Physics 2024
Kārlis Dreimanis, Antra Gaile, Guntis Pikurs, Andris Potrebko, Markus Seidel, Dimitrios Sidiropoulos Kontos, CMS Collaboration

A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at = 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 < mN < 3 GeV and decay lengths in the range 10−2 < cτN < 104 mm, where τN is the N proper mean lifetime. Signal events are defined by the signature B → ℓBNX; N → ℓ±π∓, where the leptons ℓB 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, |VN|2, and on cτN are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit |VN|2 < 2.0 × 10−5 is obtained at mN = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on |VN|2 for masses 1 < mN < 1.7 GeV are the most stringent from a collider experiment to date.


DOI
10.1007/JHEP06(2024)183
Hyperlink
https://doi.org/10.1007/JHEP06(2024)183

The CMS Collaboration, A.Hayrapetyan, K.Dreimanis, A.Gaile, G.Pikurs, A.Potrebko, M.Seidel, V.Veckalns ... [et al.]. Search for Long-Lived Heavy Neutrinos in the Decays of B Mesons Produced in Proton-Proton Collisions at √s = 13 TeV. Journal of High Energy Physics, 2024, Vol. 2024, No. 6, Article number 183. e-ISSN 1029-8479. Pieejams: doi:10.1007/JHEP06(2024)183

Publication language
English (en)
The Scientific Library of the Riga Technical University.
E-mail: uzzinas@rtu.lv; Phone: +371 28399196