Garra Ticó, JordiGraugés Pous, EugeniBABAR Collaboration2019-07-252019-07-252009-03-040031-9007https://hdl.handle.net/2445/138320We measure branching fractions and integrated rate asymmetries for the rare decays B → K ( * ) l + l − , where l + l − is either e + e − or μ + μ − , using a sample of 384 × 10 6 B ¯¯¯ B events collected with the BABAR detector at the PEP-II e + e − collider. We find no evidence for direct C P or lepton-flavor asymmetries. However, for dilepton masses below the J / ψ resonance, we find evidence for unexpectedly large isospin asymmetries in both B → K l + l − and B → K ∗ l + l − which differ, respectively, by 3.2 σ and 2.7 σ , including systematic uncertainties, from the standard model expectations.7 p.application/pdfeng(c) American Physical Society, 2009Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5777592019-07-25info:eu-repo/semantics/openAccess