Graciani Díaz, RicardoGraugés Pous, EugeniRives Molina, Vicente JoséPicatoste Olloqui, EduardoVilasis-Cardona, XavierLHCb Collaboration2017-07-272017-07-272016-12-230031-9007https://hdl.handle.net/2445/114425The CP violation observables S and C in the decay channel B-0 -> D+D- are determined from a sample of proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to an integrated luminosity of 3 fb(-1). The observable S describes CP violation in the interference between mixing and the decay amplitude, and C parametrizes direct CP violation in the decay. The following values are obtained from a flavor-tagged, decay-time-dependent analysis: S = -0.54(-0.16)(+0.17) (stat) +/- 0.05(syst) ,C=0.26(-0.17)(+0.18) (stat) +/- 0.02(syst). These values provide evidence for CP violation at a significance level of 4.0 standard deviations. The phase shift due to higher-order standard model corrections is constrained to a small value of Delta phi = -0.16(-0.21)(+0.19) rad.application/pdfengcc-by (c) CERN, 2016http://creativecommons.org/licenses/by/3.0/esGran Col·lisionador d'HadronsMesons (Física nuclear)Violació CP (Física nuclear)Large Hadron Collider (France and Switzerland)Mesons (Nuclear physics)CP violation (Nuclear physics)info:eu-repo/semantics/article6692192017-07-27info:eu-repo/semantics/openAccess28059544