Graugés Pous, EugeniBABAR Collaboration2021-03-152021-03-152020-04-160031-9007https://hdl.handle.net/2445/175080A 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.8 p.application/pdfeng(c) American Physical Society, 2020BarionsFraccionsHadronsBaryonsFractionsHadronsinfo:eu-repo/semantics/article7064692021-03-15info:eu-repo/semantics/openAccess