The different amplitudes contributing to the decay of $B_s$ into $J/\psi\ \phi (\mu^+\mu^-K^+K^-)$ can be studied with a combined analysis of decay time and angular correlations. An analysis based on data collected in 2011 and with inital $B$-meson flavour tagging is presented, improving the accuracy in the CP-violating phase $\phi_s$ compared to the untagged analysis.

MESON2014

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Mixing and CP violation in the $B_s$ system with ATLAS

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