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First Measurement of the CP-Violating Phase in B0s→ϕϕ Decays Abellan Beteta, Carlos Calvo Gómez, Míriam Camboni, Alessandro Comerma Montells, Albert Garrido Beltrán, Lluís Graciani Díaz, Ricardo Graugés Pous, Eugeni López Asamar, Elias Oyanguren Campos, Arantza de Pérez-Calero Yzquierdo, Antonio Picatoste Olloqui, Eduardo Potterat, Cédric Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Ruiz Valls, Pablo Vázquez Gómez, Ricard Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments A first flavor-tagged measurement of the time-dependent C P -violating asymmetry in B 0 s → ϕ ϕ decays is presented. In this decay channel, the C P -violating weak phase arises due to C P violation in the interference between B 0 s − ¯¯¯ B 0 s mixing and the b → s ¯ s s gluonic penguin decay amplitude. Using a sample of p p collision data corresponding to an integrated luminosity of 1.0     fb − 1 and collected at a center-of-mass energy of 7 TeV with the LHCb detector, 880 B 0 s → ϕ ϕ signal decays are obtained. The C P -violating phase is measured to be in the interval [ − 2.46 , − 0.76 ]     rad at a 68% confidence level. The p value of the standard model prediction is 16%. 2019-05-17T10:13:11Z 2019-05-17T10:13:11Z 2013-06-12 2019-05-17T10:13:11Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 0031-9007 https://hdl.handle.net/2445/133345 629000 eng Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.110.241802 Physical Review Letters, 2013, vol. 110, num. 24, p. 241802 https://doi.org/10.1103/PhysRevLett.110.241802 cc by (c) CERN; LHCb Collaboration, 2013 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess 8 p. application/pdf application/pdf American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)