{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.147308.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2766369"}},{"@id":"https://doi.org/10.1007/JHEP06(2024)183","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"A search for long-lived heavy neutrinos (N) in the decays of B mesons produced in proton-proton collisions at $\\sqrt{s}$ = 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 $\\lt$$m_\\mathrm{N}$$\\lt$ 3 GeV and decay lengths in the range 10$^{-2}$$\\lt$$c\\tau_\\mathrm{N}$$\\lt$ 10$^{4}$ mm, where $\\tau_\\mathrm{N}$ is the N proper mean lifetime. Signal events are defined by the signature B $\\to$$\\ell_\\mathrm{B}$NX; N $\\to$$\\ell^{\\pm} \\pi^{\\mp}$, where the leptons $\\ell_\\mathrm{B}$ and $\\ell$ 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 $\\ell^{\\pm} \\pi^{\\mp}$ invariant mass distributions. Limits at 95% confidence level on the sum of the squares of the mixing amplitudes between heavy and light neutrinos, $\\vert V_\\mathrm{N}\\vert^2$, and on $c\\tau$ are obtained in different mixing scenarios for both Majorana and Dirac-like N particles. The most stringent upper limit $\\vert V_\\mathrm{N}\\vert^2$ $\\lt$ 2.0 $\\times$ 10$^{-5}$ is obtained at $m_\\mathrm{N}$ = 1.95 GeV for the Majorana case where N mixes exclusively with muon neutrinos. The limits on $\\vert V_\\mathrm{N}\\vert^2$ for masses 1 $\\lt$ $m_\\mathrm{N}$ $\\lt$ 1.7 GeV are the most stringent from a collider experiment to date.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t1","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Majorana, (re, ru, rt) = (0.0, 1.0, 0.0)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t2","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Majorana, (re, ru, rt) = (0.0, 0.5, 0.5)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t3","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Majorana, (re, ru, rt) = (0.5, 0.5, 0.0)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t4","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Majorana, (re, ru, rt) = (0.33, 0.33, 0.33)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t5","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Dirac-like, (re, ru, rt) = (0.0, 1.0, 0.0)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t6","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Dirac-like, (re, ru, rt) = (0.0, 0.5, 0.5)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t7","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Dirac-like, (re, ru, rt) = (0.5, 0.5, 0.0)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t8","@type":"Dataset","description":"Expected and observed 95% CL upper limits on $|V_\\mathrm{N}|^2$ as a function of $m_\\mathrm{N}$ for the mixing scenario ($r_e$, $r_\\mu$,...","name":"Limits - Dirac-like, (re, ru, rt) = (0.33, 0.33, 0.33)"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t9","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 1.0 GeV, Majorana"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t10","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 1.5 GeV, Majorana"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t11","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 2.0 GeV, Majorana"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t12","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 1.0 GeV, Dirac-like"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t13","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 1.5 GeV, Dirac-like"},{"@id":"https://doi.org/10.17182/hepdata.147308.v1/t14","@type":"Dataset","description":"Observed 95% CL lower limits on $c\\tau_\\mathrm{N}$ as functions of the mixing ratios ($r_e$, $r_\\mu$, $r_\\tau$) for a fixed N...","name":"Ternary Plot - 2.0 GeV, Dirac-like"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2766369?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/147308"}],"inLanguage":"en","name":"Search for long-lived heavy neutrinos in the decays of B mesons produced in proton-proton collisions at $\\sqrt{s}$ = 13 TeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2766369?version=1","version":1}