{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.153486.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2813755"}},{"@id":"https://doi.org/10.1103/PhysRevD.111.L051102","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"CMS Collaboration"},"creator":{"@type":"Organization","name":"CMS Collaboration"},"datePublished":"2024","description":"A measurement of the ratio of branching fractions $R$(J/$\\psi$) = $\\mathcal{B}$(B$^+_\\text{c}$$\\to$ J/$\\psi$$\\tau^+\\nu_\\tau$) / $\\mathcal{B}$(B$^+_\\text{c}$$\\to$ J/$\\psi$$\\mu^+\\nu_\\mu$) in the J/$\\psi$$\\to$$\\mu^+\\mu^-$, $\\tau^+$$\\to$$\\mu^+\\mu_\\tau\\overline{\\nu}_\\tau$ decay channel is presented. This measurement uses a sample of proton-proton collision data collected at a center-of-mass energy of 13 TeV by the CMS experiment in 2018, corresponding to an integrated luminosity of 59.7 fb$^{-1}$. The measured ratio, $R$(J/$\\psi$) = 0.17 $^{+ 0.18}_{- 0.17}$ (stat) $^{+ 0.21}_{- 0.22}$ (syst) $^{+ 0.19}_{- 0.18}$ (theo) = 0.17 $\\pm$ 0.33, agrees with the value of 0.2582 $\\pm$ 0.0038 predicted by the standard model, which assumes lepton flavor universality. By testing lepton flavor universality, this measurement is a probe of new physics using B$^+_\\text{c}$ mesons, which are currently only produced at the LHC.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.153486.v1/t1","@type":"Dataset","description":"Measured R(J/psi) ratio","name":"R(J/psi) ratio of branching fractions"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2813755?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/153486"}],"inLanguage":"en","name":"Test of lepton flavor universality in semileptonic B$^+_\\text{c}$ meson decays 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/ins2813755?version=1","version":1}