Abellan Beteta, CarlosCalvo Gómez, MíriamCamboni, AlessandroComerma Montells, AlbertDomingo Bonal, FrancescGarrido Beltrán, LluísGrabalosa Gándara, MarcGraciani Díaz, RicardoGraugés Pous, EugeniLópez Asamar, EliasPérez-Calero Yzquierdo, AntonioPicatoste Olloqui, EduardoPotterat, CédricRives Molina, Vicente JoséRuiz, Hugo (Ruiz Pérez)Vázquez Gómez, RicardVilasis-Cardona, XavierLHCb Collaboration2019-05-202019-05-202013-03-050031-9007https://hdl.handle.net/2445/133479We report a measurement of the time-dependent ratio of D 0 → K + π − to D 0 → K − π + decay rates in D * + -tagged events using 1.0     fb − 1 of integrated luminosity recorded by the LHCb experiment. We measure the mixing parameters x ' 2 = ( − 0.9 ± 1.3 ) × 10 − 4 , y ′ = ( 7.2 ± 2.4 ) × 10 − 3 , and the ratio of doubly-Cabibbo-suppressed to Cabibbo-favored decay rates R D = ( 3.52 ± 0.15 ) × 10 − 3 , where the uncertainties include statistical and systematic sources. The result excludes the no-mixing hypothesis with a probability corresponding to 9.1 standard deviations and represents the first observation of D 0 − ¯¯¯ D 0 oscillations from a single measurement.8 p.application/pdfengcc by (c) CERN; LHCb Collaboration, 2013http://creativecommons.org/licenses/by/3.0/es/Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article6196462019-05-20info:eu-repo/semantics/openAccess