We report the observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+ in a sample of 230×10^6 Υ(4S)→BB̅ events recorded with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- storage ring. We measure the branching fractions B(B0→Ds+π-)=(1.3±0.3(stat)±0.2(syst))×10-5, B(B0→Ds-K+)=(2.5±0.4(stat)±0.4(syst))×10-5, B(B0→Ds*+π-)=(2.8±0.6(stat)±0.5(syst))×10-5, and B(B0→Ds*-K+)=(2.0±0.5(stat)±0.4(syst))×10-5. The significances of the measurements to differ from zero are 5, 9, 6, and 5 standard deviations, respectively. This is the first observation of B0→Ds+π-, B0→Ds*+π-, and B0→Ds*-K+ decays.
Observation of Decays B0→Ds(*)+π- and B0→Ds(*)-K+
SIMI, GABRIELE;Gaz A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2007
Abstract
We report the observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+ in a sample of 230×10^6 Υ(4S)→BB̅ events recorded with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e- storage ring. We measure the branching fractions B(B0→Ds+π-)=(1.3±0.3(stat)±0.2(syst))×10-5, B(B0→Ds-K+)=(2.5±0.4(stat)±0.4(syst))×10-5, B(B0→Ds*+π-)=(2.8±0.6(stat)±0.5(syst))×10-5, and B(B0→Ds*-K+)=(2.0±0.5(stat)±0.4(syst))×10-5. The significances of the measurements to differ from zero are 5, 9, 6, and 5 standard deviations, respectively. This is the first observation of B0→Ds+π-, B0→Ds*+π-, and B0→Ds*-K+ decays.
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