Abellan Beteta, CarlosCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertDomingo Bonal, FrancescGarrido Beltrán, LluísGrabalosa Gándara, MarcGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPie Valls, B. (Blai)Potterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2019-04-082019-04-082012-12-011550-7998https://hdl.handle.net/2445/131787The first observation of the decays ¯¯¯ B 0 s → D + s K − π + π − and ¯¯¯ B 0 → D + s K − π + π − are reported using an integrated luminosity of 1.0     fb − 1 recorded by the LHCb experiment. The branching fractions, normalized with respect to ¯¯¯ B 0 s → D + s π − π + π − and ¯¯¯ B 0 s → D + s K − π + π − , respectively, are measured to be B ( ¯¯¯ B 0 s → D + s K − π + π − ) B ( ¯¯¯ B 0 s → D + s π − π + π − ) = ( 5.2 ± 0.5 ± 0.3 ) × 10 − 2 and B ( ¯¯¯ B 0 → D + s K − π + π − ) B ( ¯¯¯ B 0 s → D + s K − π + π − ) = 0.54 ± 0.07 ± 0.07 , where the first uncertainty is statistical and the second is systematic. The ¯¯¯ B 0 s → D + s K − π + π − decay is of particular interest as it can be used to measure the weak phase γ . First observation of the ¯¯¯ B 0 s → D s 1 ( 2536 ) + π − , D + s 1 → D + s π − π + decay is also presented, and its branching fraction relative to ¯¯¯ B 0 s → D + s π − π + π − is found to be B ( ¯¯¯ B 0 s → D s 1 ( 2536 ) + π − , D + s 1 → D + s π − π + ) B ( ¯¯¯ B 0 s → D + s π − π + π − ) = ( 4.0 ± 1.0 ± 0.4 ) × 10 − 311 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2012http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6196472019-04-08info:eu-repo/semantics/openAccess