New measurement of the Bs mixing phase at the Tevatron

We report the new measurement of the CP violating parameter βs at CDF with an integrated luminosity of 5.2 fb−1. This result updates previous measurements of CDF and DØ and is consistent with the Standard Model prediction at the 1 σ level. We also obtain the best single experiment measurements of the Bs lifetime, lifetime difference and of the polarization amplitudes for the decay Bs→J/ψϕ.