2026-04-17T06:13:32Zhttps://recercat.cat/oai/request

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

00925njm 22002777a 4500 dc Garra Ticó, Jordi author Graugés Pous, Eugeni author BABAR Collaboration author 2019-03-25T12:33:24Z 2019-03-25T12:33:24Z 2012-08-24 2019-03-25T12:33:24Z 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. Física de partícules Experiments Leptons (Física nuclear) Particle physics Experiments Leptons (Nuclear physics) Measurement of branching fractions and rate asymmetries in the rare decays B → K(*)ℓ+ℓ−