Graciani Díaz, RicardoRuiz, Hugo (Ruiz Pérez)Garrido Beltrán, LluísGraugés Pous, EugeniLHCb Collaboration2023-03-102023-03-1020110370-2693https://hdl.handle.net/2445/195061Using data collected with the LHCb detector in proton-proton collisions at a centreof-mass energy of 7 TeV, the hadronic decay B0 s → J/ψf0(980) is observed. This CP eigenstate mode could be used to measure mixing-induced CP violation in the B0 s system. Using a fit to the π +π − mass spectrum with interfering resonances gives Rf0/φ ≡ Γ(B0 s→J/ψf0, f0→π+π−) Γ(B0 s→J/ψφ, φ→K+K−) = 0.252+0.046+0.027 −0.032−0.033. In the interval ±90 MeV around 980 MeV, corresponding to approximately two full f0 widths we also find R′ ≡ Γ(B0 s→J/ψπ+π−, |m(π+π−)−980 MeV|<90 MeV) Γ(B0 s→J/ψφ, φ→K+K−) = 0.162 ± 0.022 ± 0.016, where in both cases the uncertainties are statistical and systematic, respectively. Keywords: LHC, Hadronic B decays, B0 s meson PACS: 14.40.Nd, 13.25.Hw, 14.40.Be8 p.application/pdfeng(c) Elsevier B.V., 2011Mesons (Física nuclear)Col·lisions (Física nuclear)ProtonsMesons (Nuclear physics)Collisions (Nuclear physics)Protonsinfo:eu-repo/semantics/article6017372023-03-10info:eu-repo/semantics/openAccess