Muon-electron universality is tested in B0 → K*0 ℓ+ ℓ- decays, in the dilepton-invariant-mass region above the ψ(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) ± 0.07 (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). Test of Lepton Flavor Universality with B0 → K*0 ℓ+ ℓ- Decays at Large Dilepton Invariant Mass [journal article - articolo]. In PHYSICAL REVIEW LETTERS. Retrieved from https://hdl.handle.net/10446/335249
Test of Lepton Flavor Universality with B0 → K*0 ℓ+ ℓ- Decays at Large Dilepton Invariant Mass
Lupato, A.;Redi, F.;
2026-01-01
Abstract
Muon-electron universality is tested in B0 → K*0 ℓ+ ℓ- decays, in the dilepton-invariant-mass region above the ψ(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) ± 0.07 (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.| File | Dimensione del file | Formato | |
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