Muon-electron universality is tested in B0->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 fb-1. The ratio of branching fractions between the muon and electron channels RK*0 is measured to be 1.08-0.12+0.14(stat)\pm0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK*0 in this region and the first such measurement performed at a hadron collider.
Test of Lepton Flavor Universality with B0 →K*0\ell+\ell- Decays at Large Dilepton Invariant Mass
Celestino I.Membro del Collaboration Group
;Cordova G.Membro del Collaboration Group
;Kleijne N.Membro del Collaboration Group
;Morello M. J.Membro del Collaboration Group
;Passaro D.Membro del Collaboration Group
;Pica L.Membro del Collaboration Group
;Riccardi D.Membro del Collaboration Group
;Xu A.Membro del Collaboration Group
;
2026
Abstract
Muon-electron universality is tested in B0->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 fb-1. The ratio of branching fractions between the muon and electron channels RK*0 is measured to be 1.08-0.12+0.14(stat)\pm0.07(syst) for a dilepton-invariant-mass squared above 14.0 GeV2/c4, consistent with the standard model prediction. This result represents the most precise measurement of RK*0 in this region and the first such measurement performed at a hadron collider.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.



