Abstract:
A combined mass and particle identification fit is used to make the first observation of the decay B̅ s0→Ds ± K∓ and measure the branching fraction of B̅ s0→Ds ± K∓ relative to B̅ s0→Ds+π-. This analysis uses 1.2 fb-1 integrated luminosity of pp̅ collisions at sqrt[s]=1.96 TeV collected with the CDF II detector at the Fermilab Tevatron collider. We observe a B̅ s0→Ds ± K∓ signal with a statistical significance of 8.1σ and measure B(B̅ s0→Ds ± K∓)/B(B̅ s0→Ds+π-)=0.097 ± 0.018(stat) ± 0.009(syst).
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