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Observation of Tree-Level B Decays with s¯s Production from Gluon Radiation
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We report on our search for decays proceeding via a tree-level b → c quark transition in which a gluon radiates into an s ¯ s pair. We present observations of the decays B − → D ( * ) + s K − π − and ¯¯¯ B 0 → D + s K 0 S π − and evidence for B − → D + s K − K − and set upper limits on the branching fractions for ¯¯¯ B 0 → D * + s K 0 S π − and B − → D * + s K − K − using 383 × 10 6 Υ ( 4 S ) → B ¯¯¯ B events collected by the BABAR detector at SLAC. We present evidence that the invariant mass distributions of D ( * ) + s K − pairs from B − → D ( * ) + s K − π − decays are inconsistent with the phase-space model, suggesting the presence of charm resonances lying below the D ( * ) + s K − threshold.
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GARRA TICÓ, Jordi, GRAUGÉS POUS, Eugeni and BABAR Collaboration. Observation of Tree-Level B Decays with s¯s Production from Gluon Radiation. Physical Review Letters. 2008. Vol. 100, num. 17, pags. 171803. ISSN 0031-9007. [consulted: 9 of August of 2026]. Available at: https://hdl.handle.net/2445/138443