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A measurement of Bs J/psi phi decay parameters, including the CP-violatingweak phase phi_s and the decay width difference Delta Gamma_s is reported,using 4.9 fb-1 of integrated luminosity collected in 2011 by the ATLAS detectorfrom LHC pp collisions at a centre- of-mass energy sqrt(s) = 7 TeV. The meandecay width Gamma_s and the transversity amplitudes |A0(0)|^2 and |A||(0)|^2are also measured. The values reported for these parameters are: phi_s = 0.22\pm 0.41 (stat.) \pm 0.10 (syst.) rad Delta Gamma_s = 0.053 \pm 0.021 (stat.)\pm 0.010 (syst.) ps-1  Gamma_s = 0.677 \pm 0.007 (stat.) \pm 0.004 (syst.) ps-1  |A0(0)|^2 = 0.528 \pm 0.006 (stat.) \pm 0.009 (syst.)  |A||(0)|^2 = 0.220 \pm 0.008 (stat.) \pm 0.007 (syst.) where the valuesquoted for phi_s and Delta Gamma_s correspond to the solution compatible withthe external measurements to which the strong phase delta perpendicular isconstrained and where Delta Gamma_s is constrained to be positive. The fractionof S-wave KK or f0 contamination through the decays Bs -> J/psi K+K-(f0) ismeasured as well and is found to be consistent with zero. Results for phi_s andDelta Gamma_s are also presented as 68%, 90% and 95% likelihood contours, whichshow agreement with Standard Model expectations.

Time-dependent angular analysis of the decay Bs -> J/psi phi and extraction of Delta Gamma_s and the CP-violating weak phase phi_s by ATLAS