We report evidence for the decays B0→Ds+π- and B0→Ds-K+ and the results of a search for B0→Ds*+π- and B0→Ds*-K+ in a sample of 84×106 Υ(4S) decays into BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring. We measure the branching fractions B(B0→Ds+π-)=[3.2±0.9(stat)±1.0(syst)]×10-5 and B(B0→Ds-K+)=[3.2±1.0(stat)±1.0(syst)]×10-5. We also set 90% C.L. limits B(B0→Ds*+π-)<4.1×10-5 and B(B0→Ds*-K+)<2.5×10-5.
Study of the Rare Decays B0→Ds(*)+π- and B0→Ds(*)-K+
LO VETERE, MAURIZIO;MONGE, MARIA ROBERTA;PATRIGNANI, CLAUDIA;TOSI, SILVANO;
2003-01-01
Abstract
We report evidence for the decays B0→Ds+π- and B0→Ds-K+ and the results of a search for B0→Ds*+π- and B0→Ds*-K+ in a sample of 84×106 Υ(4S) decays into BB̅ pairs collected with the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring. We measure the branching fractions B(B0→Ds+π-)=[3.2±0.9(stat)±1.0(syst)]×10-5 and B(B0→Ds-K+)=[3.2±1.0(stat)±1.0(syst)]×10-5. We also set 90% C.L. limits B(B0→Ds*+π-)<4.1×10-5 and B(B0→Ds*-K+)<2.5×10-5.
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