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Observation of the B0s→η′η′ Decay Badalov, Alexey Calvo Gómez, Míriam Casanova Mohr, Raimon Garrido Beltrán, Lluís Gascón Fora, David Graciani Díaz, Ricardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, Eduardo Rives Molina, Vicente José Ruiz, Hugo (Ruiz Pérez) Vilasis-Cardona, Xavier LHCb Collaboration Física de partícules Experiments Particle physics Experiments The first observation of the B 0 s → η ′ η ′ decay is reported. The study is based on a sample of proton-proton collisions corresponding to 3.0     fb − 1 of integrated luminosity collected with the LHCb detector. The significance of the signal is 6.4 standard deviations. The branching fraction is measured to be [ 3.31 ± 0.64 ( stat ) ± 0.28 ( syst ) ± 0.12 ( norm ) ] × 10 − 5 , where the third uncertainty comes from the B ± → η ′ K ± branching fraction that is used as a normalization. In addition, the charge asymmetries of B ± → η ′ K ± and B ± → ϕ K ± , which are control channels, are measured to be ( − 0.2 ± 1.3 ) % and ( + 1.7 ± 1.3 ) % , respectively. All results are consistent with theoretical expectations. 2019-05-09T09:51:53Z 2019-05-09T09:51:53Z 2015-07-28 2019-05-09T09:51:53Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Reproducció del document publicat a: https://doi.org/10.1103/PhysRevLett.115.051801 Physical Review Letters, 2015, vol. 115, num. 5, p. 051801 https://doi.org/10.1103/PhysRevLett.115.051801 cc by (c) CERN; LHCb Collaboration, 2015 http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess American Physical Society Articles publicats en revistes (Física Quàntica i Astrofísica)