2026-04-14T09:09:00Zhttps://recercat.cat/oai/request

oai:recercat.cat:2445/1193372025-12-05T17:01:37Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

Measurement of angular asymmetries in the decays B →k∗+ Graugés Pous, Eugeni BABAR Collaboration Leptons (Física nuclear) Partícules (Física nuclear) Leptons (Nuclear physics) Particles (Nuclear physics) We study the lepton forward-backward asymmetry A F B and the longitudinal K ∗ polarization F L , as well as an observable P 2 derived from them, in the rare decays B → K ∗ ℓ + ℓ − , where ℓ + ℓ − is either e + e − or μ + μ − , using the full sample of 471 million B ¯ B events collected at the Υ ( 4 S ) resonance with the BABAR, detector at the PEP-II e + e − collider. We separately fit and report results for the K * 0 ( 892 ) ℓ + ℓ − and K * + ( 892 ) ℓ + ℓ − final states, as well as their combination K ∗ ℓ + ℓ − , in five disjoint dilepton mass-squared bins. An angular analysis of B + → K * + ℓ + ℓ − decays is presented here for the first time. 2018-01-26T11:17:03Z 2018-01-26T11:17:03Z 2016-03-28 2018-01-26T11:17:03Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1550-7998 https://hdl.handle.net/2445/119337 669929 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevD.93.052015 Physical Review D, 2016, vol. 93, num. 5, p. 52015-1-52015-16 https://doi.org/10.1103/PhysRevD.93.052015 (c) American Physical Society, 2016 info:eu-repo/semantics/openAccess 1 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)