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.
2026
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/174005
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