Untagged Analysis of B0s -> J/psi phi Channel

We have studied the B0s -> J/psi phi channel using a transversity analysis. We show that CMS will be able to separate the Light and Heavy eigenstates of B0s and to measure their lifetime. Consequently we expect to measure x_s indirectly for any value beyond the present experimental lower limit. Fitting a multiangle distribution we also expect to put an upper limit : lambda^2 eta<0.15 for DeltaGamma=0.2.