We present the sensitivity to the Bs--\overline Bs mixing phase \phi s at LHCb, using decays proceeding through \overline b \to \overline c c\overline s quark-level transitions. The performance is assessed by means of toy Monte Carlo simulations, parameterized using the results of full Monte Carlo studies. Both the \overline b \to \overline c c\overline s decays to pure (Bs \to \etac \phi , Bs \to Ds Ds, Bs\to J/\psi \eta ) and to an admixture of CP eigenstates (Bs \to J/\psi \phi ) are considered, and used to probe the Bs--\overline Bs mixing phase through a time-dependent mixing-induced CP measurement.
PACS numbers: 11.30.Er, 12.15.Ff, 12.15.Hh, 13.25.Hw
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