We report the observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+ in a sample of 230×106 Υ(4S)→BB̄ 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.

Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2007). Observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+. PHYSICAL REVIEW LETTERS, 98(8) [10.1103/PhysRevLett.98.081801].

Observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+

CARPINELLI, Massimo;
2007

Abstract

We report the observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+ in a sample of 230×106 Υ(4S)→BB̄ 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.
Articolo in rivista - Articolo scientifico
Electron energy levels; Elementary particles; Particle detectors; Storage rings; Asymmetric-energy; BABAR detector; Observation of decays; Standard deviations; High energy physics;
English
2007
98
8
081801
none
Aubert, B., Barate, R., Bona, M., Boutigny, D., Couderc, F., Karyotakis, Y., et al. (2007). Observation of decays B0→Ds(*)+π- and B0→Ds(*)-K+. PHYSICAL REVIEW LETTERS, 98(8) [10.1103/PhysRevLett.98.081801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/389700
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