Graugés Pous, EugeniBABAR Collaboration2019-09-192019-09-192006-02-080031-9007https://hdl.handle.net/2445/140472We study the two-body decays of B ± mesons to K ± and a charmonium state X c ¯ c in a sample of 210.5     fb − 1 of data from the BABAR experiment. We perform measurements of absolute branching fractions B ( B ± → K ± X c ¯ c ) using a missing mass technique, and report several new or improved results. In particular, the upper limit B ( B ± → K ± X ( 3872 ) ) < 3.2 × 10 − 4 at 90% C.L. and the inferred lower limit B ( X ( 3872 ) → J / ψ π + π − ) > 4.2 % will help in understanding the nature of the recently discovered X ( 3872 ) .7 p.application/pdfeng(c) American Physical Society, 2006Física de partículesExperimentsParticle physicsExperimentsinfo:eu-repo/semantics/article5425992019-09-19info:eu-repo/semantics/openAccess