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A study of the two body decays $B^\pm\rightarrow X_{c\bar c}K^\pm$, whereX$_{c\bar c}$ refers to one charmonium state, is reported by BaBarcollaboration using a data sample of 424 fb$^{-1}$. The absolute determinationof branching fractions for these decays are significantly improved compared toprevious BaBaR measurements. Evidence is found for the decay $B^+\rightarrowX(3872)K^+$ at the $3\sigma$ level. The absolute branching fraction ${\calB}(B^+\rightarrow X(3872)K^+) = (2.1\pm0.6({\rm stat})\pm0.3({\rm syst}))\times10^{-4}$ is measured for the first time. It follows that ${\calB}(X(3872)\rightarrow J/\psi\pi^+\pi^-)=(4.1\pm1.3)\%$, supporting thehypothesis of a molecular component for this resonance.

Measurements of the Absolute Branching Fractions of $B^\pm \to K^\pm X_{c\bar c}$