{"id":36540,"date":"2026-06-08T13:16:40","date_gmt":"2026-06-08T13:16:40","guid":{"rendered":"https:\/\/lamarr-institute.org\/publication\/test-of-lepton-flavour-universality-with-b0to-k0ellell-decays-at-large-dilepton-invariant-mass\/"},"modified":"2026-06-08T13:16:40","modified_gmt":"2026-06-08T13:16:40","slug":"test-of-lepton-flavour-universality-with-b0to-k0ellell-decays-at-large-dilepton-invariant-mass","status":"publish","type":"publication","link":"https:\/\/lamarr-institute.org\/de\/publication\/test-of-lepton-flavour-universality-with-b0to-k0ellell-decays-at-large-dilepton-invariant-mass\/","title":{"rendered":"Test of lepton flavour universality with $B^0\\to K^{*0}\\ell^+\\ell^-$ decays at large dilepton invariant mass"},"content":{"rendered":"<p>Muon-electron universality is tested in $B^0 \\to K^{*0} \\ \\ell^+ \\ell^-$ decays, in the dilepton-invariant-mass region above the $\\psi(2S)$ resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 $\\text{fb}^{-1}$. The ratio of branching fractions between the muon and electron channels, $R_{K^{*0}}$, is measured to be $1.08^{+0.14}_{-0.12}\\text{(stat)} \\ \\pm 0.07\\text{(syst)}$ for a dilepton-invariant-mass squared above 14.0 $\\text{GeV}^{2}\/\\text{c}^{4}$, consistent with the Standard Model prediction. This result represents the most precise measurement of $R_{K^{*0}}$ in this region and the first such measurement performed at a hadron collider.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Muon-electron universality is tested in $B^0 \\to K^{*0} \\ \\ell^+ \\ell^-$ decays, in the dilepton-invariant-mass region above the $\\psi(2S)$ resonance. The analysis uses beauty mesons produced in proton-proton collisions recorded by the LHCb detector at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 $\\text{fb}^{-1}$. The ratio of branching fractions between the muon and electron channels, $R_{K^{*0}}$, is measured to be $1.08^{+0.14}_{-0.12}\\text{(stat)} \\ \\pm [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-36540","publication","type-publication","status-publish","hentry","publication-type-article"],"acf":[],"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/36540","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication"}],"about":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/types\/publication"}],"author":[{"embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/users\/12"}],"version-history":[{"count":0,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication\/36540\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=36540"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=36540"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}