{"id":32293,"date":"2026-01-21T17:01:41","date_gmt":"2026-01-21T17:01:41","guid":{"rendered":"https:\/\/lamarr-institute.org\/publication\/test-of-lepton-flavour-universality-with-b_s0-rightarrow-phi-ellell-decays\/"},"modified":"2026-06-08T13:19:28","modified_gmt":"2026-06-08T13:19:28","slug":"test-of-lepton-flavour-universality-with-b_s0-rightarrow-phi-ellell-decays","status":"publish","type":"publication","link":"https:\/\/lamarr-institute.org\/de\/publication\/test-of-lepton-flavour-universality-with-b_s0-rightarrow-phi-ellell-decays\/","title":{"rendered":"Test of lepton flavour universality with $B_s^0 \\rightarrow \\phi \\ell^+\\ell^-$ decays"},"content":{"rendered":"<p>Lepton flavour universality in rare $b\\rightarrow s$ transitions is tested for the first time using $B_s^0$ meson decays. <\/p>\n<p>The measurements are performed using $pp$ collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9$\\,{\\rm fb}^{-1}$.  <\/p>\n<p>Branching fraction ratios between the $B_s^0 \\rightarrow \\phi e^+e^-$ and $B_s^0 \\rightarrow \\phi \\mu^+\\mu^-$ decays are measured in three regions of dilepton mass squared, $q^2$, with $0.1 < q^2 < 1.1$, $1.1 < q^2 < 6.0$, and $15 < q^2 < 19\\,{\\rm GeV}^2\/c^4$. \n\nThe results agree with the Standard Model expectation of lepton flavour universality.\n<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lepton flavour universality in rare $b\\rightarrow s$ transitions is tested for the first time using $B_s^0$ meson decays. The measurements are performed using $pp$ collision data collected by the LHCb experiment between 2011 and 2018, corresponding to a total integrated luminosity of 9$\\,{\\rm fb}^{-1}$. Branching fraction ratios between the $B_s^0 \\rightarrow \\phi e^+e^-$ and $B_s^0 \\rightarrow \\phi \\mu^+\\mu^-$ decays are measured in three regions of dilepton mass squared, $q^2$, with [&hellip;]<\/p>\n","protected":false},"author":12,"featured_media":0,"template":"","meta":{"_acf_changed":false,"footnotes":""},"publication-type":[30],"class_list":["post-32293","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\/32293","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\/32293\/revisions"}],"wp:attachment":[{"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/media?parent=32293"}],"wp:term":[{"taxonomy":"publication-type","embeddable":true,"href":"https:\/\/lamarr-institute.org\/de\/wp-json\/wp\/v2\/publication-type?post=32293"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}