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 < 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 defned 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 signifcant excess of events over the standard model background is observed in any of the ℓ ± π ∓ invariant mass distributions. Limits at 95% confdence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, |VN| 2 , and on cτN are obtained in diferent 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.

Null, N., Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., et al. (2024). 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(6), 1-53 [10.1007/jhep06(2024)183].

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

Battilana, C.;Bonacorsi, D.;Borgonovi, L.;Castro, A.;Cuffiani, M.;Diotalevi, T.;Fanfani, A.;Giommi, L.;Guiducci, L.;Lorusso, M.;Paggi, G.;Rossi Tisbeni, S.;Rovelli, T.;Siroli, G. P.;
2024

Abstract

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 < 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 defned 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 signifcant excess of events over the standard model background is observed in any of the ℓ ± π ∓ invariant mass distributions. Limits at 95% confdence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, |VN| 2 , and on cτN are obtained in diferent 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.
2024
Null, N., Hayrapetyan, A., Tumasyan, A., Adam, W., Andrejkovic, J.W., Bergauer, T., et al. (2024). 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(6), 1-53 [10.1007/jhep06(2024)183].
Null, Null; Hayrapetyan, A.; Tumasyan, A.; Adam, W.; Andrejkovic, J. W.; Bergauer, T.; Chatterjee, S.; Damanakis, K.; Dragicevic, M.; Hussain, P. S.; ...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1003146
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