Measuring CP violation and B-s(0)-(B)over-bar(s)(0) mixing using B-s(0) ->J/psi phi with phi -> K+K-, J/psi -> mu(+)mu(-)

We present a preliminary study of a new technique for measuring B-s(0) mixi ng and CP violation using the decay Bs0 --> J/phi phi, phi --> K+K-, J/phi --> mu(+)mu(-). This technique utilizes the unequal lifetimes of the B-s(0) CP even and odd eigenstates, and an angular variable decomposition of the CP content of the final state. This study is based on CDF Run-I observation s and Run-II projections, and predicts that the B-s(0) mixing parameter x(s ) can be measured with high accuracy in untagged samples if this approach i s adopted. A large CP asymmetry may also be possible to measure. The accura cy of this method is shown to increase for higher values of x(s) as the lif etime splitting of the CP eigenstates increases. The measurement of x(s) do es nor depend on tagging, whereas the observation of a CP-violating asymmet ry does.