Study of the B[sub s] meson with forthcoming LHC data at CMS

A study of the properties of the Bs meson decays has been done using a full Monte Carlo simulation of the CMS detector. The CMS pixel detector allows a precise measurement of the Bs decay vertices which are displaced from the proton‐proton interaction point. This facilitates a time dependent analysis of the angular correlations between the Bs decay products. In particular, the decay Bs→(J/ψ)φ→μ+μ−K+K− enables measurements of the width difference between heavy and light mass eigenstates. Furthermore, it permits a measurement of the CP violating phase φs which is sensitive to physics beyond the Standard Model.