We report on our search for decays proceeding via a tree-level b→c quark transition in which a gluon radiates into an ss̅ pair. We present observations of the decays B-→Ds(*)+K-π- and B̅ 0→Ds+KS0π- and evidence for B-→Ds+K-K- and set upper limits on the branching fractions for B̅ 0→Ds*+KS0π- and B-→Ds*+K-K- using 383×10^6 Υ(4S)→BB̅ events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of Ds(*)+K- pairs from B-→Ds(*)+K-π- decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the Ds(*)+K- threshold.
Observation of Tree-Level B Decays with ss̅ Production from Gluon Radiation
SIMI, GABRIELE;GAZ A;MARGONI, MARTINO;SIMONETTO, FRANCO;STROILI, ROBERTO;VOCI, CESARE;
2008
Abstract
We report on our search for decays proceeding via a tree-level b→c quark transition in which a gluon radiates into an ss̅ pair. We present observations of the decays B-→Ds(*)+K-π- and B̅ 0→Ds+KS0π- and evidence for B-→Ds+K-K- and set upper limits on the branching fractions for B̅ 0→Ds*+KS0π- and B-→Ds*+K-K- using 383×10^6 Υ(4S)→BB̅ events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of Ds(*)+K- pairs from B-→Ds(*)+K-π- decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the Ds(*)+K- threshold.File in questo prodotto:
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