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oai:recercat.cat:2445/1308452025-12-05T16:50:06Zcom_2072_1057col_2072_478823col_2072_478917

Measurement of branching fractions and rate asymmetries in the rare decays B → K(*)ℓ+ℓ− Garra Ticó, Jordi Graugés Pous, Eugeni BABAR Collaboration Física de partícules Experiments Leptons (Física nuclear) Particle physics Experiments Leptons (Nuclear physics) In a sample of 471 × 10 6 B ¯¯¯ B events collected with the BABAR detector at the PEP-II e + e − collider we study the rare decays B → K ( * ) ℓ + ℓ − , where ℓ + ℓ − is either e + e − or μ + μ − . We report results on partial branching fractions and isospin asymmetries in seven bins of dilepton mass-squared. We further present C P and lepton-flavor asymmetries for dilepton masses below and above the J / ψ resonance. We find no evidence for C P or lepton-flavor violation. The partial branching fractions and isospin asymmetries are consistent with the Standard Model predictions and with results from other experiments. 2019-03-25T12:33:24Z 2019-03-25T12:33:24Z 2012-08-24 2019-03-25T12:33:24Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/130845 654988 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.86.032012 Physical Review D, 2012, vol. 86, num. 3, p. 032012 https://doi.org/10.1103/PhysRevD.86.032012 (c) American Physical Society, 2012 info:eu-repo/semantics/openAccess 15 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)