We report a measurement of the lifetime, decay rate difference and CP-violating phase for B0s mesons obtained from a flavour-tagged, time-dependent, angular analysis in a sample of 5598 ± 113 B0s → J/ψφ decays selected in a 8
fb−1 data sample of pp collisions at √s = 1.96TeV recorded with the DØ experiment at Fermilab