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

Understand

A study of the two body decays $B^\pm\rightarrow X_{c\bar c}K^\pm$, where X$_{c\bar c}$ refers to one charmonium state, is reported by 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 $B^+\rightarrow X(3872)K^+$ at the $3\sigma$ level.
• The absolute branching fraction ${\cal B}(B^+\rightarrow X(3872)K^+) = (2.1\pm0.6({\rm stat})\pm0.3({\rm syst}))\times 10^{-4}$ is measured for the first time.