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First Evidence of Direct CP Violation in Charmless Two-Body Decays of B0s Mesons Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Domingo Bonal, Francesc Garrido Beltrán, Lluís Gascón Fora, David Grabalosa Gándara, Marc Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Pie Valls, B. (Blai) Potterat, Cédric Puig Navarro, Albert Roselló, M. Ruiz, Hugo (Ruiz Pérez) Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments Using a data sample corresponding to an integrated luminosity of 0.35     fb − 1 collected by LHCb in 2011, we report the first evidence of C P violation in the decays of B 0 s mesons to K ± π ∓ pairs, A C P ( B 0 s → K π ) = 0.27 ± 0.08 ( stat ) ± 0.02 ( syst ) , with a significance of 3.3 σ . Furthermore, we report the most precise measurement of C P violation in the decays of B 0 mesons to K ± π ∓ pairs, A C P ( B 0 → K π ) = − 0.088 ± 0.011 ( stat ) ± 0.008 ( syst ) , with a significance exceeding 6 σ . 2019-05-22T11:16:32Z 2019-05-22T11:16:32Z 2012-05-16 2019-05-22T11:16:32Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/133693 618974 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.108.201601 Physical Review Letters, 2012, vol. 108, num. 20, p. 201601 https://doi.org/10.1103/PhysRevLett.108.201601 cc by (c) CERN; LHCb Collaboration, 2012 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 8 p. application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)