PoS - Proceedings of Science
Volume 364 - European Physical Society Conference on High Energy Physics (EPS-HEP2019) - QCD and Hadronic Physics
Measurements of the Absolute Branching Fractions of $B^{\pm} \to K^{\pm} X_{c\bar{c}}$
G.H.M. Wormser*  on behalf of the BABAR collaboration
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Pre-published on: November 03, 2020
Published on: November 12, 2020
A study of the two body decays B$^{+}\rightarrow X_{c\bar c}$K$^{+}$, where X$_{c\bar c}$ refers to one charmonium state, is reported by the BABAR experiment using a data sample of 424 fb$^{-1}$. The absolute determination of many branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found at 3 $\sigma$ level for the decay B$^{+}\rightarrow X(3872)$K$^{+}$. The absolute branching fraction BR(B$^{+}\rightarrow X(3872)$K$^{+}$) = (2.1$\pm$0.6(stat)$\pm$0.3(syst))$\cdot$10$^{-4}$ is measured for the first time. From this, it follows that the branching fraction BR($X(3872)\
\rightarrow J/\psi\pi^+\pi^-$) is equal to (4.1$\pm$1.3)\%, supporting the hypothesis of a molecular component for this resonance.
DOI: https://doi.org/10.22323/1.364.0481
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