LHCb CollaborationAdeva Andany, BernardoÁlvarez Cartelle, PaulaDosil Suárez, ÁlvaroFernández Albor, VíctorGallas Torreira, AbrahamHernando Morata, José ÁngelPazos Álvarez, AntonioPérez Trigo, EliseoPló Casasús, MáximoRodríguez Pérez, P.Romero Vidal, AntonioSaborido Silva, Juan JoséSanmartín Sedes, BraisSantamarina Ríos, CibránSeco, M.Vázquez Regueiro, Pablo2026-01-122026-01-122013-06-12R. Aaij40, C. Abellan Beteta35,o, B. Adeva et al. Phys. Rev. Lett. 110, 241802 – Published 12 June, 2013https://hdl.handle.net/10347/45025A first flavor-tagged measurement of the time-dependent CP-violating asymmetry in B0s->phiphi decays is presented. In this decay channel, the CP-violating weak phase arises due to CP violation in the interference between B0s-B0s mixing and the b ! sss gluonic penguin decay amplitude. Using a sample of pp 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 B0s->phiphi signal decays are obtained. The CP-violating phase is measured to be in the interval ½ 2:46; 0:76 rad at a 68% confidence level. The p value of the standard model prediction is 16%eng2013 CERN, for the LHCb Collaboration. This article is available under the terms of the Creative Commons Attribution 3.0 LicenseAttribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Penguin quantum loops𝐶⁢𝑃-Violating PhaseCabibbo-Kobayashi-Maskawa quark mixing matrixjournal article10.1103/PhysRevLett.110.2418021079-7114open access