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Measurement of angular asymmetries in the decays B →k∗+
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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.
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurement of angular asymmetries in the decays B →k∗+. Physical Review D. 2016. Vol. 93, num. 5, pags. 52015-1-52015-16. ISSN 1550-7998. [consulted: 28 of August of 2026]. Available at: https://hdl.handle.net/2445/119337