ATLAS collaboration (2857 authors)Aguilar-Saavedra, Juan AntonioAmor Dos Santos, Susana PatriciaAnjos, NunoAraque, Juan PedroCantrill, RobertCarvalho, JoãoCastro, Nuno FilipeConde Muiño, PatriciaDa Cunha Sargedas De Sousa, Mario JoseFiolhais, MiguelGalhardo, BrunoGomes, AgostinhoGonçalo, RicardoJorge, PedroLopes, LourencoMachado Miguens, JoanaMaio, AméliaManeira, JoséOnofre, AntónioPalma, AlbertoPedro, RutePina, João AntonioPinto, BelmiroSantos, HelenaSaraiva, JoãoSilva, JoséTavares Delgado, AdemarVeloso, FilipeWolters, Helmut2019-02-042019-02-042016-08-24http://dx.doi.org/10.1007/JHEP08(2016)147http://hdl.handle.net/10400.26/27008A measurement of the B$_{s}^{0}$ decay parameters in the B$_{s}^{0}$  → J/ψϕ channel using an integrated luminosity of 14.3 fb$^{−1}$ collected by the ATLAS detector from 8 TeV pp collisions at the LHC is presented. The measured parameters include the CP -violating phase ϕ$_{s}$ , the decay width Γ$_{s}$ and the width difference between the mass eigenstates ΔΓ$_{s}$ . The values measured for the physical parameters are statistically combined with those from 4.9 fb$^{−1}$ of 7 TeV data, leading to the following: $ \begin{array}{l}{\phi}_s=-0.090\pm 0.078\left(\mathrm{stat}.\right)\pm 0.041\left(\mathrm{syst}.\right)\mathrm{rad}\\ {}\varDelta {\varGamma}_s=0.085\pm 0.011\left(\mathrm{stat}.\right)\pm 0.007\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}\\ {}{\varGamma}_s=0.675\pm 0.003\left(\mathrm{stat}.\right)\pm 0.003\left(\mathrm{syst}.\right){\mathrm{ps}}^{-1}.\end{array} $engjournal article2019-02-04