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The Bs meson is an interesting particle to study because a sizable mixinginduced CP violation in the Bs-Bsbar system would be an indication for physicsbeyond the Standard Model. In this paper we present a measurement of thelifetime difference DeltaGamma between the Bs mass eigenstates and the CPviolating phase in the decay Bs -> J/psi phi. In 1.7 fb^-1 of data collectedwith the CDF II detector at the Tevatron ppbar collider we measure DeltaGamma =0.076 +0.059-0.063 (stat.) +- 0.006 (syst.) ps^-1, well consistent with theStandard Model prediction, and a mean Bs lifetime of ctau_s = 456 +-13 (stat.)+- 7 (syst.) m^-6. We find no evidence for CP violation.

Lifetime Difference and CP Asymmetry in the Bs -> J/psi phi decay