LHCb CollaborationAbellan Beteta, CarlosOyanguren Campos, Arantza deCamboni, AlessandroComerma Montells, AlbertGarrido Beltrán, LluísGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPotterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardCalvo Gómez, MíriamRuiz Valls, PabloVilasis-Cardona, Xavier2023-03-292023-03-292013-060370-2693https://hdl.handle.net/2445/196201An analysis of B± → D K ± and B± → Dπ ± decays is presented where the D meson is reconstructed in the four-body final state K ±π ∓π +π −. Using LHCb data corresponding to an integrated luminosity of 1.0 fb−1, first observations are made of the suppressed ADS modes B± → [π ± K ∓π +π −]D K ± and B± → [π ± K ∓π +π −]D π ± with a significance of 5.1σ and greater than 10σ , respectively. Measurements of CP asymmetries and CP-conserving ratios of partial widths from this family of decays are also performed. The magnitude of the ratio between the suppressed and favoured B± → D K ± amplitudes is determined to be r K B = 0.097 ± 0.01110 p.application/pdfengcc-by-nc-nd (c) CERN., 2013https://creativecommons.org/licenses/by-nc-nd/4.0/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6289952023-03-29info:eu-repo/semantics/openAccess