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A measurement of the $B^0_s$ decay parameters in the $B^0_s \to J/\psi\phi$channel using an integrated luminosity of 14.3 $\mathrm{fb}^{-1}$ collected bythe ATLAS detector from 8 TeV $pp$ collisions at the LHC is presented. Themeasured parameters include the $CP$-violating phase $\phi_s$, the decay width$\Gamma_s$ and the width difference between the mass eigenstates$\Delta\Gamma_s$. The values measured for the physical parameters arestatistically combined with those from 4.9 $\mathrm{fb}^{-1}$ of 7 TeV data,leading to the following: \begin{eqnarray*} \phi_s & = & -0.090 \pm0.078\;\mathrm{(stat.)} \pm 0.041\;\mathrm{(syst.)\;rad} \\ \Delta\Gamma_s & =& 0.085 \pm 0.011\;\mathrm{(stat.)} \pm 0.007\;\mathrm{(syst.)\;ps}^{-1} \\\Gamma_s & = & 0.675 \pm 0.003\;\mathrm{(stat.)} \pm0.003\;\mathrm{(syst.)\;ps}^{-1}. \end{eqnarray*} In the analysis the parameter$\Delta\Gamma_s$ is constrained to be positive. Results for $\phi_s$ and$\Delta\Gamma_s$ are also presented as 68% and 95% likelihood contours in the$\phi_s-\Delta\Gamma_s$ plane. Also measured in this decay channel are thetransversity amplitudes and corresponding strong phases. All measurements arein agreement with the Standard Model predictions.

Measurement of the CP-violating phase $\phi_s$ and the $B^0_s$ meson decay width difference with $B^0_s \to J/\psi\phi$ decays in ATLAS