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Measurements of the Absolute Branching Fractions of B-+/- -> K(+/-)Xc(c)over-bar
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A study of the two-body decays B±→Xc¯cK±, where Xc¯c refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb−1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10−4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π−]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.
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GRAUGÉS POUS, Eugeni and BABAR Collaboration. Measurements of the Absolute Branching Fractions of B-+/- -> K(+/-)Xc(c)over-bar. Physical Review Letters. 2020. Vol. 124, num. 15, pags. 152001. ISSN 0031-9007. [consulted: 30 of May of 2026]. Available at: https://hdl.handle.net/2445/175080