First measurement of the relative branching fractions Br(Bs0 →Ds±K+) / Br(Bs0 →Ds+π)

This web page summarizes the results for the first measurement of the relative branching fractions Br(Bs0 →Ds±K+) / Br(Bs0 →Ds+π). We use 1.2 fb−1 of Ds(&phi&pi)X data. The results were approved on May 24, 2007.

We obtain Br(Bs0 →Ds±K+) / Br(Bs0 →Ds+π) = 0.107 ± 0.019(stat) ± 0.008(sys). The statistical significance of the Bs0 →Ds±K+ signal is 7.90σ.

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